removing (outdated) drawterm

drawterm is much better maintained by russ cox,
so removing this outdated copy.

for a more recent version, go to:

http://swtch.com/drawterm/

1 files changed, 0 insertions, 2291 deletions

diff --git a/sys/src/cmd/unix/drawterm/libsec/tlshand.c b/sys/src/cmd/unix/drawterm/libsec/tlshand.c
deleted file mode 100644
index 0d04a66e9..000000000
--- a/sys/src/cmd/unix/drawterm/libsec/tlshand.c
+++ /dev/null
@@ -1,2291 +0,0 @@
-#include <u.h>
-#include <libc.h>
-#include <bio.h>
-#include <auth.h>
-#include <mp.h>
-#include <libsec.h>
-
-// The main groups of functions are:
-//		client/server - main handshake protocol definition
-//		message functions - formating handshake messages
-//		cipher choices - catalog of digest and encrypt algorithms
-//		security functions - PKCS#1, sslHMAC, session keygen
-//		general utility functions - malloc, serialization
-// The handshake protocol builds on the TLS/SSL3 record layer protocol,
-// which is implemented in kernel device #a.  See also /lib/rfc/rfc2246.
-
-enum {
-	TLSFinishedLen = 12,
-	SSL3FinishedLen = MD5dlen+SHA1dlen,
-	MaxKeyData = 104,	// amount of secret we may need
-	MaxChunk = 1<<14,
-	RandomSize = 32,
-	SidSize = 32,
-	MasterSecretSize = 48,
-	AQueue = 0,
-	AFlush = 1,
-};
-
-typedef struct TlsSec TlsSec;
-
-typedef struct Bytes{
-	int len;
-	uchar data[1];  // [len]
-} Bytes;
-
-typedef struct Ints{
-	int len;
-	int data[1];  // [len]
-} Ints;
-
-typedef struct Algs{
-	char *enc;
-	char *digest;
-	int nsecret;
-	int tlsid;
-	int ok;
-} Algs;
-
-typedef struct Finished{
-	uchar verify[SSL3FinishedLen];
-	int n;
-} Finished;
-
-typedef struct TlsConnection{
-	TlsSec *sec;	// security management goo
-	int hand, ctl;	// record layer file descriptors
-	int erred;		// set when tlsError called
-	int (*trace)(char*fmt, ...); // for debugging
-	int version;	// protocol we are speaking
-	int verset;		// version has been set
-	int ver2hi;		// server got a version 2 hello
-	int isClient;	// is this the client or server?
-	Bytes *sid;		// SessionID
-	Bytes *cert;	// only last - no chain
-
-	Lock statelk;
-	int state;		// must be set using setstate
-
-	// input buffer for handshake messages
-	uchar buf[MaxChunk+2048];
-	uchar *rp, *ep;
-
-	uchar crandom[RandomSize];	// client random
-	uchar srandom[RandomSize];	// server random
-	int clientVersion;	// version in ClientHello
-	char *digest;	// name of digest algorithm to use
-	char *enc;		// name of encryption algorithm to use
-	int nsecret;	// amount of secret data to init keys
-
-	// for finished messages
-	MD5state	hsmd5;	// handshake hash
-	SHAstate	hssha1;	// handshake hash
-	Finished	finished;
-} TlsConnection;
-
-typedef struct Msg{
-	int tag;
-	union {
-		struct {
-			int version;
-			uchar 	random[RandomSize];
-			Bytes*	sid;
-			Ints*	ciphers;
-			Bytes*	compressors;
-		} clientHello;
-		struct {
-			int version;
-			uchar 	random[RandomSize];
-			Bytes*	sid;
-			int cipher;
-			int compressor;
-		} serverHello;
-		struct {
-			int ncert;
-			Bytes **certs;
-		} certificate;
-		struct {
-			Bytes *types;
-			int nca;
-			Bytes **cas;
-		} certificateRequest;
-		struct {
-			Bytes *key;
-		} clientKeyExchange;
-		Finished finished;
-	} u;
-} Msg;
-
-typedef struct TlsSec{
-	char *server;	// name of remote; nil for server
-	int ok;	// <0 killed; ==0 in progress; >0 reusable
-	RSApub *rsapub;
-	AuthRpc *rpc;	// factotum for rsa private key
-	uchar sec[MasterSecretSize];	// master secret
-	uchar crandom[RandomSize];	// client random
-	uchar srandom[RandomSize];	// server random
-	int clientVers;		// version in ClientHello
-	int vers;			// final version
-	// byte generation and handshake checksum
-	void (*prf)(uchar*, int, uchar*, int, char*, uchar*, int, uchar*, int);
-	void (*setFinished)(TlsSec*, MD5state, SHAstate, uchar*, int);
-	int nfin;
-} TlsSec;
-
-
-enum {
-	TLSVersion = 0x0301,
-	SSL3Version = 0x0300,
-	ProtocolVersion = 0x0301,	// maximum version we speak
-	MinProtoVersion = 0x0300,	// limits on version we accept
-	MaxProtoVersion	= 0x03ff,
-};
-
-// handshake type
-enum {
-	HHelloRequest,
-	HClientHello,
-	HServerHello,
-	HSSL2ClientHello = 9,  /* local convention;  see devtls.c */
-	HCertificate = 11,
-	HServerKeyExchange,
-	HCertificateRequest,
-	HServerHelloDone,
-	HCertificateVerify,
-	HClientKeyExchange,
-	HFinished = 20,
-	HMax
-};
-
-// alerts
-enum {
-	ECloseNotify = 0,
-	EUnexpectedMessage = 10,
-	EBadRecordMac = 20,
-	EDecryptionFailed = 21,
-	ERecordOverflow = 22,
-	EDecompressionFailure = 30,
-	EHandshakeFailure = 40,
-	ENoCertificate = 41,
-	EBadCertificate = 42,
-	EUnsupportedCertificate = 43,
-	ECertificateRevoked = 44,
-	ECertificateExpired = 45,
-	ECertificateUnknown = 46,
-	EIllegalParameter = 47,
-	EUnknownCa = 48,
-	EAccessDenied = 49,
-	EDecodeError = 50,
-	EDecryptError = 51,
-	EExportRestriction = 60,
-	EProtocolVersion = 70,
-	EInsufficientSecurity = 71,
-	EInternalError = 80,
-	EUserCanceled = 90,
-	ENoRenegotiation = 100,
-	EMax = 256
-};
-
-// cipher suites
-enum {
-	TLS_NULL_WITH_NULL_NULL	 		= 0x0000,
-	TLS_RSA_WITH_NULL_MD5 			= 0x0001,
-	TLS_RSA_WITH_NULL_SHA 			= 0x0002,
-	TLS_RSA_EXPORT_WITH_RC4_40_MD5 		= 0x0003,
-	TLS_RSA_WITH_RC4_128_MD5 		= 0x0004,
-	TLS_RSA_WITH_RC4_128_SHA 		= 0x0005,
-	TLS_RSA_EXPORT_WITH_RC2_CBC_40_MD5	= 0X0006,
-	TLS_RSA_WITH_IDEA_CBC_SHA 		= 0X0007,
-	TLS_RSA_EXPORT_WITH_DES40_CBC_SHA	= 0X0008,
-	TLS_RSA_WITH_DES_CBC_SHA		= 0X0009,
-	TLS_RSA_WITH_3DES_EDE_CBC_SHA		= 0X000A,
-	TLS_DH_DSS_EXPORT_WITH_DES40_CBC_SHA	= 0X000B,
-	TLS_DH_DSS_WITH_DES_CBC_SHA		= 0X000C,
-	TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA	= 0X000D,
-	TLS_DH_RSA_EXPORT_WITH_DES40_CBC_SHA	= 0X000E,
-	TLS_DH_RSA_WITH_DES_CBC_SHA		= 0X000F,
-	TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA	= 0X0010,
-	TLS_DHE_DSS_EXPORT_WITH_DES40_CBC_SHA	= 0X0011,
-	TLS_DHE_DSS_WITH_DES_CBC_SHA		= 0X0012,
-	TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA	= 0X0013,	// ZZZ must be implemented for tls1.0 compliance
-	TLS_DHE_RSA_EXPORT_WITH_DES40_CBC_SHA	= 0X0014,
-	TLS_DHE_RSA_WITH_DES_CBC_SHA		= 0X0015,
-	TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA	= 0X0016,
-	TLS_DH_anon_EXPORT_WITH_RC4_40_MD5	= 0x0017,
-	TLS_DH_anon_WITH_RC4_128_MD5 		= 0x0018,
-	TLS_DH_anon_EXPORT_WITH_DES40_CBC_SHA	= 0X0019,
-	TLS_DH_anon_WITH_DES_CBC_SHA		= 0X001A,
-	TLS_DH_anon_WITH_3DES_EDE_CBC_SHA	= 0X001B,
-
-	TLS_RSA_WITH_AES_128_CBC_SHA		= 0X002f,	// aes, aka rijndael with 128 bit blocks
-	TLS_DH_DSS_WITH_AES_128_CBC_SHA		= 0X0030,
-	TLS_DH_RSA_WITH_AES_128_CBC_SHA		= 0X0031,
-	TLS_DHE_DSS_WITH_AES_128_CBC_SHA	= 0X0032,
-	TLS_DHE_RSA_WITH_AES_128_CBC_SHA	= 0X0033,
-	TLS_DH_anon_WITH_AES_128_CBC_SHA	= 0X0034,
-	TLS_RSA_WITH_AES_256_CBC_SHA		= 0X0035,
-	TLS_DH_DSS_WITH_AES_256_CBC_SHA		= 0X0036,
-	TLS_DH_RSA_WITH_AES_256_CBC_SHA		= 0X0037,
-	TLS_DHE_DSS_WITH_AES_256_CBC_SHA	= 0X0038,
-	TLS_DHE_RSA_WITH_AES_256_CBC_SHA	= 0X0039,
-	TLS_DH_anon_WITH_AES_256_CBC_SHA	= 0X003A,
-	CipherMax
-};
-
-// compression methods
-enum {
-	CompressionNull = 0,
-	CompressionMax
-};
-
-static Algs cipherAlgs[] = {
-	{"rc4_128", "md5",	2 * (16 + MD5dlen), TLS_RSA_WITH_RC4_128_MD5},
-	{"rc4_128", "sha1",	2 * (16 + SHA1dlen), TLS_RSA_WITH_RC4_128_SHA},
-	{"3des_ede_cbc","sha1",2*(4*8+SHA1dlen), TLS_RSA_WITH_3DES_EDE_CBC_SHA},
-};
-
-static uchar compressors[] = {
-	CompressionNull,
-};
-
-static TlsConnection *tlsServer2(int ctl, int hand, uchar *cert, int ncert, int (*trace)(char*fmt, ...));
-static TlsConnection *tlsClient2(int ctl, int hand, uchar *csid, int ncsid, int (*trace)(char*fmt, ...));
-
-static void	msgClear(Msg *m);
-static char* msgPrint(char *buf, int n, Msg *m);
-static int	msgRecv(TlsConnection *c, Msg *m);
-static int	msgSend(TlsConnection *c, Msg *m, int act);
-static void	tlsError(TlsConnection *c, int err, char *msg, ...);
-#pragma	varargck argpos	tlsError 3
-static int setVersion(TlsConnection *c, int version);
-static int finishedMatch(TlsConnection *c, Finished *f);
-static void tlsConnectionFree(TlsConnection *c);
-
-static int setAlgs(TlsConnection *c, int a);
-static int okCipher(Ints *cv);
-static int okCompression(Bytes *cv);
-static int initCiphers(void);
-static Ints* makeciphers(void);
-
-static TlsSec* tlsSecInits(int cvers, uchar *csid, int ncsid, uchar *crandom, uchar *ssid, int *nssid, uchar *srandom);
-static int	tlsSecSecrets(TlsSec *sec, int vers, uchar *epm, int nepm, uchar *kd, int nkd);
-static TlsSec*	tlsSecInitc(int cvers, uchar *crandom);
-static int	tlsSecSecretc(TlsSec *sec, uchar *sid, int nsid, uchar *srandom, uchar *cert, int ncert, int vers, uchar **epm, int *nepm, uchar *kd, int nkd);
-static int	tlsSecFinished(TlsSec *sec, MD5state md5, SHAstate sha1, uchar *fin, int nfin, int isclient);
-static void	tlsSecOk(TlsSec *sec);
-static void	tlsSecKill(TlsSec *sec);
-static void	tlsSecClose(TlsSec *sec);
-static void	setMasterSecret(TlsSec *sec, Bytes *pm);
-static void	serverMasterSecret(TlsSec *sec, uchar *epm, int nepm);
-static void	setSecrets(TlsSec *sec, uchar *kd, int nkd);
-static int	clientMasterSecret(TlsSec *sec, RSApub *pub, uchar **epm, int *nepm);
-static Bytes *pkcs1_encrypt(Bytes* data, RSApub* key, int blocktype);
-static Bytes *pkcs1_decrypt(TlsSec *sec, uchar *epm, int nepm);
-static void	tlsSetFinished(TlsSec *sec, MD5state hsmd5, SHAstate hssha1, uchar *finished, int isClient);
-static void	sslSetFinished(TlsSec *sec, MD5state hsmd5, SHAstate hssha1, uchar *finished, int isClient);
-static void	sslPRF(uchar *buf, int nbuf, uchar *key, int nkey, char *label,
-			uchar *seed0, int nseed0, uchar *seed1, int nseed1);
-static int setVers(TlsSec *sec, int version);
-
-static AuthRpc* factotum_rsa_open(uchar *cert, int certlen);
-static mpint* factotum_rsa_decrypt(AuthRpc *rpc, mpint *cipher);
-static void factotum_rsa_close(AuthRpc*rpc);
-
-static void* emalloc(int);
-static void* erealloc(void*, int);
-static void put32(uchar *p, u32int);
-static void put24(uchar *p, int);
-static void put16(uchar *p, int);
-static u32int get32(uchar *p);
-static int get24(uchar *p);
-static int get16(uchar *p);
-static Bytes* newbytes(int len);
-static Bytes* makebytes(uchar* buf, int len);
-static void freebytes(Bytes* b);
-static Ints* newints(int len);
-static Ints* makeints(int* buf, int len);
-static void freeints(Ints* b);
-
-//================= client/server ========================
-
-//	push TLS onto fd, returning new (application) file descriptor
-//		or -1 if error.
-int
-tlsServer(int fd, TLSconn *conn)
-{
-	char buf[8];
-	char dname[64];
-	int n, data, ctl, hand;
-	TlsConnection *tls;
-
-	if(conn == nil)
-		return -1;
-	ctl = open("#a/tls/clone", ORDWR);
-	if(ctl < 0)
-		return -1;
-	n = read(ctl, buf, sizeof(buf)-1);
-	if(n < 0){
-		close(ctl);
-		return -1;
-	}
-	buf[n] = 0;
-	sprint(conn->dir, "#a/tls/%s", buf);
-	sprint(dname, "#a/tls/%s/hand", buf);
-	hand = open(dname, ORDWR);
-	if(hand < 0){
-		close(ctl);
-		return -1;
-	}
-	fprint(ctl, "fd %d 0x%x", fd, ProtocolVersion);
-	tls = tlsServer2(ctl, hand, conn->cert, conn->certlen, conn->trace);
-	sprint(dname, "#a/tls/%s/data", buf);
-	data = open(dname, ORDWR);
-	close(fd);
-	close(hand);
-	close(ctl);
-	if(data < 0){
-		return -1;
-	}
-	if(tls == nil){
-		close(data);
-		return -1;
-	}
-	if(conn->cert)
-		free(conn->cert);
-	conn->cert = 0;  // client certificates are not yet implemented
-	conn->certlen = 0;
-	conn->sessionIDlen = tls->sid->len;
-	conn->sessionID = emalloc(conn->sessionIDlen);
-	memcpy(conn->sessionID, tls->sid->data, conn->sessionIDlen);
-	tlsConnectionFree(tls);
-	return data;
-}
-
-//	push TLS onto fd, returning new (application) file descriptor
-//		or -1 if error.
-int
-tlsClient(int fd, TLSconn *conn)
-{
-	char buf[8];
-	char dname[64];
-	int n, data, ctl, hand;
-	TlsConnection *tls;
-
-	if(!conn)
-		return -1;
-	ctl = open("#a/tls/clone", ORDWR);
-	if(ctl < 0)
-		return -1;
-	n = read(ctl, buf, sizeof(buf)-1);
-	if(n < 0){
-		close(ctl);
-		return -1;
-	}
-	buf[n] = 0;
-	sprint(conn->dir, "#a/tls/%s", buf);
-	sprint(dname, "#a/tls/%s/hand", buf);
-	hand = open(dname, ORDWR);
-	if(hand < 0){
-		close(ctl);
-		return -1;
-	}
-	sprint(dname, "#a/tls/%s/data", buf);
-	data = open(dname, ORDWR);
-	if(data < 0)
-		return -1;
-	fprint(ctl, "fd %d 0x%x", fd, ProtocolVersion);
-	tls = tlsClient2(ctl, hand, conn->sessionID, conn->sessionIDlen, conn->trace);
-	close(fd);
-	close(hand);
-	close(ctl);
-	if(tls == nil){
-		close(data);
-		return -1;
-	}
-	conn->certlen = tls->cert->len;
-	conn->cert = emalloc(conn->certlen);
-	memcpy(conn->cert, tls->cert->data, conn->certlen);
-	conn->sessionIDlen = tls->sid->len;
-	conn->sessionID = emalloc(conn->sessionIDlen);
-	memcpy(conn->sessionID, tls->sid->data, conn->sessionIDlen);
-	tlsConnectionFree(tls);
-	return data;
-}
-
-static TlsConnection *
-tlsServer2(int ctl, int hand, uchar *cert, int ncert, int (*trace)(char*fmt, ...))
-{
-	TlsConnection *c;
-	Msg m;
-	Bytes *csid;
-	uchar sid[SidSize], kd[MaxKeyData];
-	char *secrets;
-	int cipher, compressor, nsid, rv;
-
-	if(trace)
-		trace("tlsServer2\n");
-	if(!initCiphers())
-		return nil;
-	c = emalloc(sizeof(TlsConnection));
-	c->ctl = ctl;
-	c->hand = hand;
-	c->trace = trace;
-	c->version = ProtocolVersion;
-
-	memset(&m, 0, sizeof(m));
-	if(!msgRecv(c, &m)){
-		if(trace)
-			trace("initial msgRecv failed\n");
-		goto Err;
-	}
-	if(m.tag != HClientHello) {
-		tlsError(c, EUnexpectedMessage, "expected a client hello");
-		goto Err;
-	}
-	c->clientVersion = m.u.clientHello.version;
-	if(trace)
-		trace("ClientHello version %x\n", c->clientVersion);
-	if(setVersion(c, m.u.clientHello.version) < 0) {
-		tlsError(c, EIllegalParameter, "incompatible version");
-		goto Err;
-	}
-
-	memmove(c->crandom, m.u.clientHello.random, RandomSize);
-	cipher = okCipher(m.u.clientHello.ciphers);
-	if(cipher < 0) {
-		// reply with EInsufficientSecurity if we know that's the case
-		if(cipher == -2)
-			tlsError(c, EInsufficientSecurity, "cipher suites too weak");
-		else
-			tlsError(c, EHandshakeFailure, "no matching cipher suite");
-		goto Err;
-	}
-	if(!setAlgs(c, cipher)){
-		tlsError(c, EHandshakeFailure, "no matching cipher suite");
-		goto Err;
-	}
-	compressor = okCompression(m.u.clientHello.compressors);
-	if(compressor < 0) {
-		tlsError(c, EHandshakeFailure, "no matching compressor");
-		goto Err;
-	}
-
-	csid = m.u.clientHello.sid;
-	if(trace)
-		trace("  cipher %d, compressor %d, csidlen %d\n", cipher, compressor, csid->len);
-	c->sec = tlsSecInits(c->clientVersion, csid->data, csid->len, c->crandom, sid, &nsid, c->srandom);
-	if(c->sec == nil){
-		tlsError(c, EHandshakeFailure, "can't initialize security: %r");
-		goto Err;
-	}
-	c->sec->rpc = factotum_rsa_open(cert, ncert);
-	if(c->sec->rpc == nil){
-		tlsError(c, EHandshakeFailure, "factotum_rsa_open: %r");
-		goto Err;
-	}
-	c->sec->rsapub = X509toRSApub(cert, ncert, nil, 0);
-	msgClear(&m);
-
-	m.tag = HServerHello;
-	m.u.serverHello.version = c->version;
-	memmove(m.u.serverHello.random, c->srandom, RandomSize);
-	m.u.serverHello.cipher = cipher;
-	m.u.serverHello.compressor = compressor;
-	c->sid = makebytes(sid, nsid);
-	m.u.serverHello.sid = makebytes(c->sid->data, c->sid->len);
-	if(!msgSend(c, &m, AQueue))
-		goto Err;
-	msgClear(&m);
-
-	m.tag = HCertificate;
-	m.u.certificate.ncert = 1;
-	m.u.certificate.certs = emalloc(m.u.certificate.ncert * sizeof(Bytes));
-	m.u.certificate.certs[0] = makebytes(cert, ncert);
-	if(!msgSend(c, &m, AQueue))
-		goto Err;
-	msgClear(&m);
-
-	m.tag = HServerHelloDone;
-	if(!msgSend(c, &m, AFlush))
-		goto Err;
-	msgClear(&m);
-
-	if(!msgRecv(c, &m))
-		goto Err;
-	if(m.tag != HClientKeyExchange) {
-		tlsError(c, EUnexpectedMessage, "expected a client key exchange");
-		goto Err;
-	}
-	if(tlsSecSecrets(c->sec, c->version, m.u.clientKeyExchange.key->data, m.u.clientKeyExchange.key->len, kd, c->nsecret) < 0){
-		tlsError(c, EHandshakeFailure, "couldn't set secrets: %r");
-		goto Err;
-	}
-	if(trace)
-		trace("tls secrets\n");
-	secrets = (char*)emalloc(2*c->nsecret);
-	enc64(secrets, 2*c->nsecret, kd, c->nsecret);
-	rv = fprint(c->ctl, "secret %s %s 0 %s", c->digest, c->enc, secrets);
-	memset(secrets, 0, 2*c->nsecret);
-	free(secrets);
-	memset(kd, 0, c->nsecret);
-	if(rv < 0){
-		tlsError(c, EHandshakeFailure, "can't set keys: %r");
-		goto Err;
-	}
-	msgClear(&m);
-
-	/* no CertificateVerify; skip to Finished */
-	if(tlsSecFinished(c->sec, c->hsmd5, c->hssha1, c->finished.verify, c->finished.n, 1) < 0){
-		tlsError(c, EInternalError, "can't set finished: %r");
-		goto Err;
-	}
-	if(!msgRecv(c, &m))
-		goto Err;
-	if(m.tag != HFinished) {
-		tlsError(c, EUnexpectedMessage, "expected a finished");
-		goto Err;
-	}
-	if(!finishedMatch(c, &m.u.finished)) {
-		tlsError(c, EHandshakeFailure, "finished verification failed");
-		goto Err;
-	}
-	msgClear(&m);
-
-	/* change cipher spec */
-	if(fprint(c->ctl, "changecipher") < 0){
-		tlsError(c, EInternalError, "can't enable cipher: %r");
-		goto Err;
-	}
-
-	if(tlsSecFinished(c->sec, c->hsmd5, c->hssha1, c->finished.verify, c->finished.n, 0) < 0){
-		tlsError(c, EInternalError, "can't set finished: %r");
-		goto Err;
-	}
-	m.tag = HFinished;
-	m.u.finished = c->finished;
-	if(!msgSend(c, &m, AFlush))
-		goto Err;
-	msgClear(&m);
-	if(trace)
-		trace("tls finished\n");
-
-	if(fprint(c->ctl, "opened") < 0)
-		goto Err;
-	tlsSecOk(c->sec);
-	return c;
-
-Err:
-	msgClear(&m);
-	tlsConnectionFree(c);
-	return 0;
-}
-
-static TlsConnection *
-tlsClient2(int ctl, int hand, uchar *csid, int ncsid, int (*trace)(char*fmt, ...))
-{
-	TlsConnection *c;
-	Msg m;
-	uchar kd[MaxKeyData], *epm;
-	char *secrets;
-	int creq, nepm, rv;
-
-	if(!initCiphers())
-		return nil;
-	epm = nil;
-	c = emalloc(sizeof(TlsConnection));
-	c->version = ProtocolVersion;
-	c->ctl = ctl;
-	c->hand = hand;
-	c->trace = trace;
-	c->isClient = 1;
-	c->clientVersion = c->version;
-
-	c->sec = tlsSecInitc(c->clientVersion, c->crandom);
-	if(c->sec == nil)
-		goto Err;
-
-	/* client hello */
-	memset(&m, 0, sizeof(m));
-	m.tag = HClientHello;
-	m.u.clientHello.version = c->clientVersion;
-	memmove(m.u.clientHello.random, c->crandom, RandomSize);
-	m.u.clientHello.sid = makebytes(csid, ncsid);
-	m.u.clientHello.ciphers = makeciphers();
-	m.u.clientHello.compressors = makebytes(compressors,sizeof(compressors));
-	if(!msgSend(c, &m, AFlush))
-		goto Err;
-	msgClear(&m);
-
-	/* server hello */
-	if(!msgRecv(c, &m))
-		goto Err;
-	if(m.tag != HServerHello) {
-		tlsError(c, EUnexpectedMessage, "expected a server hello");
-		goto Err;
-	}
-	if(setVersion(c, m.u.serverHello.version) < 0) {
-		tlsError(c, EIllegalParameter, "incompatible version %r");
-		goto Err;
-	}
-	memmove(c->srandom, m.u.serverHello.random, RandomSize);
-	c->sid = makebytes(m.u.serverHello.sid->data, m.u.serverHello.sid->len);
-	if(c->sid->len != 0 && c->sid->len != SidSize) {
-		tlsError(c, EIllegalParameter, "invalid server session identifier");
-		goto Err;
-	}
-	if(!setAlgs(c, m.u.serverHello.cipher)) {
-		tlsError(c, EIllegalParameter, "invalid cipher suite");
-		goto Err;
-	}
-	if(m.u.serverHello.compressor != CompressionNull) {
-		tlsError(c, EIllegalParameter, "invalid compression");
-		goto Err;
-	}
-	msgClear(&m);
-
-	/* certificate */
-	if(!msgRecv(c, &m) || m.tag != HCertificate) {
-		tlsError(c, EUnexpectedMessage, "expected a certificate");
-		goto Err;
-	}
-	if(m.u.certificate.ncert < 1) {
-		tlsError(c, EIllegalParameter, "runt certificate");
-		goto Err;
-	}
-	c->cert = makebytes(m.u.certificate.certs[0]->data, m.u.certificate.certs[0]->len);
-	msgClear(&m);
-
-	/* server key exchange (optional) */
-	if(!msgRecv(c, &m))
-		goto Err;
-	if(m.tag == HServerKeyExchange) {
-		tlsError(c, EUnexpectedMessage, "got an server key exchange");
-		goto Err;
-		// If implementing this later, watch out for rollback attack
-		// described in Wagner Schneier 1996, section 4.4.
-	}
-
-	/* certificate request (optional) */
-	creq = 0;
-	if(m.tag == HCertificateRequest) {
-		creq = 1;
-		msgClear(&m);
-		if(!msgRecv(c, &m))
-			goto Err;
-	}
-
-	if(m.tag != HServerHelloDone) {
-		tlsError(c, EUnexpectedMessage, "expected a server hello done");
-		goto Err;
-	}
-	msgClear(&m);
-
-	if(tlsSecSecretc(c->sec, c->sid->data, c->sid->len, c->srandom,
-			c->cert->data, c->cert->len, c->version, &epm, &nepm,
-			kd, c->nsecret) < 0){
-		tlsError(c, EBadCertificate, "invalid x509/rsa certificate");
-		goto Err;
-	}
-	secrets = (char*)emalloc(2*c->nsecret);
-	enc64(secrets, 2*c->nsecret, kd, c->nsecret);
-	rv = fprint(c->ctl, "secret %s %s 1 %s", c->digest, c->enc, secrets);
-	memset(secrets, 0, 2*c->nsecret);
-	free(secrets);
-	memset(kd, 0, c->nsecret);
-	if(rv < 0){
-		tlsError(c, EHandshakeFailure, "can't set keys: %r");
-		goto Err;
-	}
-
-	if(creq) {
-		/* send a zero length certificate */
-		m.tag = HCertificate;
-		if(!msgSend(c, &m, AFlush))
-			goto Err;
-		msgClear(&m);
-	}
-
-	/* client key exchange */
-	m.tag = HClientKeyExchange;
-	m.u.clientKeyExchange.key = makebytes(epm, nepm);
-	free(epm);
-	epm = nil;
-	if(m.u.clientKeyExchange.key == nil) {
-		tlsError(c, EHandshakeFailure, "can't set secret: %r");
-		goto Err;
-	}
-	if(!msgSend(c, &m, AFlush))
-		goto Err;
-	msgClear(&m);
-
-	/* change cipher spec */
-	if(fprint(c->ctl, "changecipher") < 0){
-		tlsError(c, EInternalError, "can't enable cipher: %r");
-		goto Err;
-	}
-
-	// Cipherchange must occur immediately before Finished to avoid
-	// potential hole;  see section 4.3 of Wagner Schneier 1996.
-	if(tlsSecFinished(c->sec, c->hsmd5, c->hssha1, c->finished.verify, c->finished.n, 1) < 0){
-		tlsError(c, EInternalError, "can't set finished 1: %r");
-		goto Err;
-	}
-	m.tag = HFinished;
-	m.u.finished = c->finished;
-
-	if(!msgSend(c, &m, AFlush)) {
-		fprint(2, "tlsClient nepm=%d\n", nepm);
-		tlsError(c, EInternalError, "can't flush after client Finished: %r");
-		goto Err;
-	}
-	msgClear(&m);
-
-	if(tlsSecFinished(c->sec, c->hsmd5, c->hssha1, c->finished.verify, c->finished.n, 0) < 0){
-		fprint(2, "tlsClient nepm=%d\n", nepm);
-		tlsError(c, EInternalError, "can't set finished 0: %r");
-		goto Err;
-	}
-	if(!msgRecv(c, &m)) {
-		fprint(2, "tlsClient nepm=%d\n", nepm);
-		tlsError(c, EInternalError, "can't read server Finished: %r");
-		goto Err;
-	}
-	if(m.tag != HFinished) {
-		fprint(2, "tlsClient nepm=%d\n", nepm);
-		tlsError(c, EUnexpectedMessage, "expected a Finished msg from server");
-		goto Err;
-	}
-
-	if(!finishedMatch(c, &m.u.finished)) {
-		tlsError(c, EHandshakeFailure, "finished verification failed");
-		goto Err;
-	}
-	msgClear(&m);
-
-	if(fprint(c->ctl, "opened") < 0){
-		if(trace)
-			trace("unable to do final open: %r\n");
-		goto Err;
-	}
-	tlsSecOk(c->sec);
-	return c;
-
-Err:
-	free(epm);
-	msgClear(&m);
-	tlsConnectionFree(c);
-	return 0;
-}
-
-
-//================= message functions ========================
-
-static uchar sendbuf[9000], *sendp;
-
-static int
-msgSend(TlsConnection *c, Msg *m, int act)
-{
-	uchar *p; // sendp = start of new message;  p = write pointer
-	int nn, n, i;
-
-	if(sendp == nil)
-		sendp = sendbuf;
-	p = sendp;
-	if(c->trace)
-		c->trace("send %s", msgPrint((char*)p, (sizeof sendbuf) - (p-sendbuf), m));
-
-	p[0] = m->tag;	// header - fill in size later
-	p += 4;
-
-	switch(m->tag) {
-	default:
-		tlsError(c, EInternalError, "can't encode a %d", m->tag);
-		goto Err;
-	case HClientHello:
-		// version
-		put16(p, m->u.clientHello.version);
-		p += 2;
-
-		// random
-		memmove(p, m->u.clientHello.random, RandomSize);
-		p += RandomSize;
-
-		// sid
-		n = m->u.clientHello.sid->len;
-		assert(n < 256);
-		p[0] = n;
-		memmove(p+1, m->u.clientHello.sid->data, n);
-		p += n+1;
-
-		n = m->u.clientHello.ciphers->len;
-		assert(n > 0 && n < 200);
-		put16(p, n*2);
-		p += 2;
-		for(i=0; i<n; i++) {
-			put16(p, m->u.clientHello.ciphers->data[i]);
-			p += 2;
-		}
-
-		n = m->u.clientHello.compressors->len;
-		assert(n > 0);
-		p[0] = n;
-		memmove(p+1, m->u.clientHello.compressors->data, n);
-		p += n+1;
-		break;
-	case HServerHello:
-		put16(p, m->u.serverHello.version);
-		p += 2;
-
-		// random
-		memmove(p, m->u.serverHello.random, RandomSize);
-		p += RandomSize;
-
-		// sid
-		n = m->u.serverHello.sid->len;
-		assert(n < 256);
-		p[0] = n;
-		memmove(p+1, m->u.serverHello.sid->data, n);
-		p += n+1;
-
-		put16(p, m->u.serverHello.cipher);
-		p += 2;
-		p[0] = m->u.serverHello.compressor;
-		p += 1;
-		break;
-	case HServerHelloDone:
-		break;
-	case HCertificate:
-		nn = 0;
-		for(i = 0; i < m->u.certificate.ncert; i++)
-			nn += 3 + m->u.certificate.certs[i]->len;
-		if(p + 3 + nn - sendbuf > sizeof(sendbuf)) {
-			tlsError(c, EInternalError, "output buffer too small for certificate");
-			goto Err;
-		}
-		put24(p, nn);
-		p += 3;
-		for(i = 0; i < m->u.certificate.ncert; i++){
-			put24(p, m->u.certificate.certs[i]->len);
-			p += 3;
-			memmove(p, m->u.certificate.certs[i]->data, m->u.certificate.certs[i]->len);
-			p += m->u.certificate.certs[i]->len;
-		}
-		break;
-	case HClientKeyExchange:
-		n = m->u.clientKeyExchange.key->len;
-		if(c->version != SSL3Version){
-			put16(p, n);
-			p += 2;
-		}
-		memmove(p, m->u.clientKeyExchange.key->data, n);
-		p += n;
-		break;
-	case HFinished:
-		memmove(p, m->u.finished.verify, m->u.finished.n);
-		p += m->u.finished.n;
-		break;
-	}
-
-	// go back and fill in size
-	n = p-sendp;
-	assert(p <= sendbuf+sizeof(sendbuf));
-	put24(sendp+1, n-4);
-
-	// remember hash of Handshake messages
-	if(m->tag != HHelloRequest) {
-		md5(sendp, n, 0, &c->hsmd5);
-		sha1(sendp, n, 0, &c->hssha1);
-	}
-
-	sendp = p;
-	if(act == AFlush){
-		sendp = sendbuf;
-		if(write(c->hand, sendbuf, p-sendbuf) < 0){
-			fprint(2, "write error: %r\n");
-			goto Err;
-		}
-	}
-	msgClear(m);
-	return 1;
-Err:
-	msgClear(m);
-	return 0;
-}
-
-static uchar*
-tlsReadN(TlsConnection *c, int n)
-{
-	uchar *p;
-	int nn, nr;
-
-	nn = c->ep - c->rp;
-	if(nn < n){
-		if(c->rp != c->buf){
-			memmove(c->buf, c->rp, nn);
-			c->rp = c->buf;
-			c->ep = &c->buf[nn];
-		}
-		for(; nn < n; nn += nr) {
-			nr = read(c->hand, &c->rp[nn], n - nn);
-			if(nr <= 0)
-				return nil;
-			c->ep += nr;
-		}
-	}
-	p = c->rp;
-	c->rp += n;
-	return p;
-}
-
-static int
-msgRecv(TlsConnection *c, Msg *m)
-{
-	uchar *p;
-	int type, n, nn, i, nsid, nrandom, nciph;
-
-	for(;;) {
-		p = tlsReadN(c, 4);
-		if(p == nil)
-			return 0;
-		type = p[0];
-		n = get24(p+1);
-
-		if(type != HHelloRequest)
-			break;
-		if(n != 0) {
-			tlsError(c, EDecodeError, "invalid hello request during handshake");
-			return 0;
-		}
-	}
-
-	if(n > sizeof(c->buf)) {
-		tlsError(c, EDecodeError, "handshake message too long %d %d", n, sizeof(c->buf));
-		return 0;
-	}
-
-	if(type == HSSL2ClientHello){
-		/* Cope with an SSL3 ClientHello expressed in SSL2 record format.
-			This is sent by some clients that we must interoperate
-			with, such as Java's JSSE and Microsoft's Internet Explorer. */
-		p = tlsReadN(c, n);
-		if(p == nil)
-			return 0;
-		md5(p, n, 0, &c->hsmd5);
-		sha1(p, n, 0, &c->hssha1);
-		m->tag = HClientHello;
-		if(n < 22)
-			goto Short;
-		m->u.clientHello.version = get16(p+1);
-		p += 3;
-		n -= 3;
-		nn = get16(p); /* cipher_spec_len */
-		nsid = get16(p + 2);
-		nrandom = get16(p + 4);
-		p += 6;
-		n -= 6;
-		if(nsid != 0 	/* no sid's, since shouldn't restart using ssl2 header */
-				|| nrandom < 16 || nn % 3)
-			goto Err;
-		if(c->trace && (n - nrandom != nn))
-			c->trace("n-nrandom!=nn: n=%d nrandom=%d nn=%d\n", n, nrandom, nn);
-		/* ignore ssl2 ciphers and look for {0x00, ssl3 cipher} */
-		nciph = 0;
-		for(i = 0; i < nn; i += 3)
-			if(p[i] == 0)
-				nciph++;
-		m->u.clientHello.ciphers = newints(nciph);
-		nciph = 0;
-		for(i = 0; i < nn; i += 3)
-			if(p[i] == 0)
-				m->u.clientHello.ciphers->data[nciph++] = get16(&p[i + 1]);
-		p += nn;
-		m->u.clientHello.sid = makebytes(nil, 0);
-		if(nrandom > RandomSize)
-			nrandom = RandomSize;
-		memset(m->u.clientHello.random, 0, RandomSize - nrandom);
-		memmove(&m->u.clientHello.random[RandomSize - nrandom], p, nrandom);
-		m->u.clientHello.compressors = newbytes(1);
-		m->u.clientHello.compressors->data[0] = CompressionNull;
-		goto Ok;
-	}
-
-	md5(p, 4, 0, &c->hsmd5);
-	sha1(p, 4, 0, &c->hssha1);
-
-	p = tlsReadN(c, n);
-	if(p == nil)
-		return 0;
-
-	md5(p, n, 0, &c->hsmd5);
-	sha1(p, n, 0, &c->hssha1);
-
-	m->tag = type;
-
-	switch(type) {
-	default:
-		tlsError(c, EUnexpectedMessage, "can't decode a %d", type);
-		goto Err;
-	case HClientHello:
-		if(n < 2)
-			goto Short;
-		m->u.clientHello.version = get16(p);
-		p += 2;
-		n -= 2;
-
-		if(n < RandomSize)
-			goto Short;
-		memmove(m->u.clientHello.random, p, RandomSize);
-		p += RandomSize;
-		n -= RandomSize;
-		if(n < 1 || n < p[0]+1)
-			goto Short;
-		m->u.clientHello.sid = makebytes(p+1, p[0]);
-		p += m->u.clientHello.sid->len+1;
-		n -= m->u.clientHello.sid->len+1;
-
-		if(n < 2)
-			goto Short;
-		nn = get16(p);
-		p += 2;
-		n -= 2;
-
-		if((nn & 1) || n < nn || nn < 2)
-			goto Short;
-		m->u.clientHello.ciphers = newints(nn >> 1);
-		for(i = 0; i < nn; i += 2)
-			m->u.clientHello.ciphers->data[i >> 1] = get16(&p[i]);
-		p += nn;
-		n -= nn;
-
-		if(n < 1 || n < p[0]+1 || p[0] == 0)
-			goto Short;
-		nn = p[0];
-		m->u.clientHello.compressors = newbytes(nn);
-		memmove(m->u.clientHello.compressors->data, p+1, nn);
-		n -= nn + 1;
-		break;
-	case HServerHello:
-		if(n < 2)
-			goto Short;
-		m->u.serverHello.version = get16(p);
-		p += 2;
-		n -= 2;
-
-		if(n < RandomSize)
-			goto Short;
-		memmove(m->u.serverHello.random, p, RandomSize);
-		p += RandomSize;
-		n -= RandomSize;
-
-		if(n < 1 || n < p[0]+1)
-			goto Short;
-		m->u.serverHello.sid = makebytes(p+1, p[0]);
-		p += m->u.serverHello.sid->len+1;
-		n -= m->u.serverHello.sid->len+1;
-
-		if(n < 3)
-			goto Short;
-		m->u.serverHello.cipher = get16(p);
-		m->u.serverHello.compressor = p[2];
-		n -= 3;
-		break;
-	case HCertificate:
-		if(n < 3)
-			goto Short;
-		nn = get24(p);
-		p += 3;
-		n -= 3;
-		if(n != nn)
-			goto Short;
-		/* certs */
-		i = 0;
-		while(n > 0) {
-			if(n < 3)
-				goto Short;
-			nn = get24(p);
-			p += 3;
-			n -= 3;
-			if(nn > n)
-				goto Short;
-			m->u.certificate.ncert = i+1;
-			m->u.certificate.certs = erealloc(m->u.certificate.certs, (i+1)*sizeof(Bytes));
-			m->u.certificate.certs[i] = makebytes(p, nn);
-			p += nn;
-			n -= nn;
-			i++;
-		}
-		break;
-	case HCertificateRequest:
-		if(n < 2)
-			goto Short;
-		nn = get16(p);
-		p += 2;
-		n -= 2;
-		if(nn < 1 || nn > n)
-			goto Short;
-		m->u.certificateRequest.types = makebytes(p, nn);
-		nn = get24(p);
-		p += 3;
-		n -= 3;
-		if(nn == 0 || n != nn)
-			goto Short;
-		/* cas */
-		i = 0;
-		while(n > 0) {
-			if(n < 2)
-				goto Short;
-			nn = get16(p);
-			p += 2;
-			n -= 2;
-			if(nn < 1 || nn > n)
-				goto Short;
-			m->u.certificateRequest.nca = i+1;
-			m->u.certificateRequest.cas = erealloc(m->u.certificateRequest.cas, (i+1)*sizeof(Bytes));
-			m->u.certificateRequest.cas[i] = makebytes(p, nn);
-			p += nn;
-			n -= nn;
-			i++;
-		}
-		break;
-	case HServerHelloDone:
-		break;
-	case HClientKeyExchange:
-		/*
-		 * this message depends upon the encryption selected
-		 * assume rsa.
-		 */
-		if(c->version == SSL3Version)
-			nn = n;
-		else{
-			if(n < 2)
-				goto Short;
-			nn = get16(p);
-			p += 2;
-			n -= 2;
-		}
-		if(n < nn)
-			goto Short;
-		m->u.clientKeyExchange.key = makebytes(p, nn);
-		n -= nn;
-		break;
-	case HFinished:
-		m->u.finished.n = c->finished.n;
-		if(n < m->u.finished.n)
-			goto Short;
-		memmove(m->u.finished.verify, p, m->u.finished.n);
-		n -= m->u.finished.n;
-		break;
-	}
-
-	if(type != HClientHello && n != 0)
-		goto Short;
-Ok:
-	if(c->trace){
-		char buf[8000];
-		c->trace("recv %s", msgPrint(buf, sizeof buf, m));
-	}
-	return 1;
-Short:
-	tlsError(c, EDecodeError, "handshake message has invalid length");
-Err:
-	msgClear(m);
-	return 0;
-}
-
-static void
-msgClear(Msg *m)
-{
-	int i;
-
-	switch(m->tag) {
-	default:
-		sysfatal("msgClear: unknown message type: %d", m->tag);
-	case HHelloRequest:
-		break;
-	case HClientHello:
-		freebytes(m->u.clientHello.sid);
-		freeints(m->u.clientHello.ciphers);
-		freebytes(m->u.clientHello.compressors);
-		break;
-	case HServerHello:
-		freebytes(m->u.clientHello.sid);
-		break;
-	case HCertificate:
-		for(i=0; i<m->u.certificate.ncert; i++)
-			freebytes(m->u.certificate.certs[i]);
-		free(m->u.certificate.certs);
-		break;
-	case HCertificateRequest:
-		freebytes(m->u.certificateRequest.types);
-		for(i=0; i<m->u.certificateRequest.nca; i++)
-			freebytes(m->u.certificateRequest.cas[i]);
-		free(m->u.certificateRequest.cas);
-		break;
-	case HServerHelloDone:
-		break;
-	case HClientKeyExchange:
-		freebytes(m->u.clientKeyExchange.key);
-		break;
-	case HFinished:
-		break;
-	}
-	memset(m, 0, sizeof(Msg));
-}
-
-static char *
-bytesPrint(char *bs, char *be, char *s0, Bytes *b, char *s1)
-{
-	int i;
-
-	if(s0)
-		bs = seprint(bs, be, "%s", s0);
-	bs = seprint(bs, be, "[");
-	if(b == nil)
-		bs = seprint(bs, be, "nil");
-	else
-		for(i=0; i<b->len; i++)
-			bs = seprint(bs, be, "%.2x ", b->data[i]);
-	bs = seprint(bs, be, "]");
-	if(s1)
-		bs = seprint(bs, be, "%s", s1);
-	return bs;
-}
-
-static char *
-intsPrint(char *bs, char *be, char *s0, Ints *b, char *s1)
-{
-	int i;
-
-	if(s0)
-		bs = seprint(bs, be, "%s", s0);
-	bs = seprint(bs, be, "[");
-	if(b == nil)
-		bs = seprint(bs, be, "nil");
-	else
-		for(i=0; i<b->len; i++)
-			bs = seprint(bs, be, "%x ", b->data[i]);
-	bs = seprint(bs, be, "]");
-	if(s1)
-		bs = seprint(bs, be, "%s", s1);
-	return bs;
-}
-
-static char*
-msgPrint(char *buf, int n, Msg *m)
-{
-	int i;
-	char *bs = buf, *be = buf+n;
-
-	switch(m->tag) {
-	default:
-		bs = seprint(bs, be, "unknown %d\n", m->tag);
-		break;
-	case HClientHello:
-		bs = seprint(bs, be, "ClientHello\n");
-		bs = seprint(bs, be, "\tversion: %.4x\n", m->u.clientHello.version);
-		bs = seprint(bs, be, "\trandom: ");
-		for(i=0; i<RandomSize; i++)
-			bs = seprint(bs, be, "%.2x", m->u.clientHello.random[i]);
-		bs = seprint(bs, be, "\n");
-		bs = bytesPrint(bs, be, "\tsid: ", m->u.clientHello.sid, "\n");
-		bs = intsPrint(bs, be, "\tciphers: ", m->u.clientHello.ciphers, "\n");
-		bs = bytesPrint(bs, be, "\tcompressors: ", m->u.clientHello.compressors, "\n");
-		break;
-	case HServerHello:
-		bs = seprint(bs, be, "ServerHello\n");
-		bs = seprint(bs, be, "\tversion: %.4x\n", m->u.serverHello.version);
-		bs = seprint(bs, be, "\trandom: ");
-		for(i=0; i<RandomSize; i++)
-			bs = seprint(bs, be, "%.2x", m->u.serverHello.random[i]);
-		bs = seprint(bs, be, "\n");
-		bs = bytesPrint(bs, be, "\tsid: ", m->u.serverHello.sid, "\n");
-		bs = seprint(bs, be, "\tcipher: %.4x\n", m->u.serverHello.cipher);
-		bs = seprint(bs, be, "\tcompressor: %.2x\n", m->u.serverHello.compressor);
-		break;
-	case HCertificate:
-		bs = seprint(bs, be, "Certificate\n");
-		for(i=0; i<m->u.certificate.ncert; i++)
-			bs = bytesPrint(bs, be, "\t", m->u.certificate.certs[i], "\n");
-		break;
-	case HCertificateRequest:
-		bs = seprint(bs, be, "CertificateRequest\n");
-		bs = bytesPrint(bs, be, "\ttypes: ", m->u.certificateRequest.types, "\n");
-		bs = seprint(bs, be, "\tcertificateauthorities\n");
-		for(i=0; i<m->u.certificateRequest.nca; i++)
-			bs = bytesPrint(bs, be, "\t\t", m->u.certificateRequest.cas[i], "\n");
-		break;
-	case HServerHelloDone:
-		bs = seprint(bs, be, "ServerHelloDone\n");
-		break;
-	case HClientKeyExchange:
-		bs = seprint(bs, be, "HClientKeyExchange\n");
-		bs = bytesPrint(bs, be, "\tkey: ", m->u.clientKeyExchange.key, "\n");
-		break;
-	case HFinished:
-		bs = seprint(bs, be, "HFinished\n");
-		for(i=0; i<m->u.finished.n; i++)
-			bs = seprint(bs, be, "%.2x", m->u.finished.verify[i]);
-		bs = seprint(bs, be, "\n");
-		break;
-	}
-	USED(bs);
-	return buf;
-}
-
-static void
-tlsError(TlsConnection *c, int err, char *fmt, ...)
-{
-	char msg[512];
-	va_list arg;
-
-	va_start(arg, fmt);
-	vseprint(msg, msg+sizeof(msg), fmt, arg);
-	va_end(arg);
-	if(c->trace)
-		c->trace("tlsError: %s\n", msg);
-	else if(c->erred)
-		fprint(2, "double error: %r, %s", msg);
-	else
-		werrstr("tls: local %s", msg);
-	c->erred = 1;
-	fprint(c->ctl, "alert %d", err);
-}
-
-// commit to specific version number
-static int
-setVersion(TlsConnection *c, int version)
-{
-	if(c->verset || version > MaxProtoVersion || version < MinProtoVersion)
-		return -1;
-	if(version > c->version)
-		version = c->version;
-	if(version == SSL3Version) {
-		c->version = version;
-		c->finished.n = SSL3FinishedLen;
-	}else if(version == TLSVersion){
-		c->version = version;
-		c->finished.n = TLSFinishedLen;
-	}else
-		return -1;
-	c->verset = 1;
-	return fprint(c->ctl, "version 0x%x", version);
-}
-
-// confirm that received Finished message matches the expected value
-static int
-finishedMatch(TlsConnection *c, Finished *f)
-{
-	return memcmp(f->verify, c->finished.verify, f->n) == 0;
-}
-
-// free memory associated with TlsConnection struct
-//		(but don't close the TLS channel itself)
-static void
-tlsConnectionFree(TlsConnection *c)
-{
-	tlsSecClose(c->sec);
-	freebytes(c->sid);
-	freebytes(c->cert);
-	memset(c, 0, sizeof(c));
-	free(c);
-}
-
-
-//================= cipher choices ========================
-
-static int weakCipher[CipherMax] =
-{
-	1,	/* TLS_NULL_WITH_NULL_NULL */
-	1,	/* TLS_RSA_WITH_NULL_MD5 */
-	1,	/* TLS_RSA_WITH_NULL_SHA */
-	1,	/* TLS_RSA_EXPORT_WITH_RC4_40_MD5 */
-	0,	/* TLS_RSA_WITH_RC4_128_MD5 */
-	0,	/* TLS_RSA_WITH_RC4_128_SHA */
-	1,	/* TLS_RSA_EXPORT_WITH_RC2_CBC_40_MD5 */
-	0,	/* TLS_RSA_WITH_IDEA_CBC_SHA */
-	1,	/* TLS_RSA_EXPORT_WITH_DES40_CBC_SHA */
-	0,	/* TLS_RSA_WITH_DES_CBC_SHA */
-	0,	/* TLS_RSA_WITH_3DES_EDE_CBC_SHA */
-	1,	/* TLS_DH_DSS_EXPORT_WITH_DES40_CBC_SHA */
-	0,	/* TLS_DH_DSS_WITH_DES_CBC_SHA */
-	0,	/* TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA */
-	1,	/* TLS_DH_RSA_EXPORT_WITH_DES40_CBC_SHA */
-	0,	/* TLS_DH_RSA_WITH_DES_CBC_SHA */
-	0,	/* TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA */
-	1,	/* TLS_DHE_DSS_EXPORT_WITH_DES40_CBC_SHA */
-	0,	/* TLS_DHE_DSS_WITH_DES_CBC_SHA */
-	0,	/* TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA */
-	1,	/* TLS_DHE_RSA_EXPORT_WITH_DES40_CBC_SHA */
-	0,	/* TLS_DHE_RSA_WITH_DES_CBC_SHA */
-	0,	/* TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA */
-	1,	/* TLS_DH_anon_EXPORT_WITH_RC4_40_MD5 */
-	1,	/* TLS_DH_anon_WITH_RC4_128_MD5 */
-	1,	/* TLS_DH_anon_EXPORT_WITH_DES40_CBC_SHA */
-	1,	/* TLS_DH_anon_WITH_DES_CBC_SHA */
-	1,	/* TLS_DH_anon_WITH_3DES_EDE_CBC_SHA */
-};
-
-static int
-setAlgs(TlsConnection *c, int a)
-{
-	int i;
-
-	for(i = 0; i < nelem(cipherAlgs); i++){
-		if(cipherAlgs[i].tlsid == a){
-			c->enc = cipherAlgs[i].enc;
-			c->digest = cipherAlgs[i].digest;
-			c->nsecret = cipherAlgs[i].nsecret;
-			if(c->nsecret > MaxKeyData)
-				return 0;
-			return 1;
-		}
-	}
-	return 0;
-}
-
-static int
-okCipher(Ints *cv)
-{
-	int weak, i, j, c;
-
-	weak = 1;
-	for(i = 0; i < cv->len; i++) {
-		c = cv->data[i];
-		if(c >= CipherMax)
-			weak = 0;
-		else
-			weak &= weakCipher[c];
-		for(j = 0; j < nelem(cipherAlgs); j++)
-			if(cipherAlgs[j].ok && cipherAlgs[j].tlsid == c)
-				return c;
-	}
-	if(weak)
-		return -2;
-	return -1;
-}
-
-static int
-okCompression(Bytes *cv)
-{
-	int i, j, c;
-
-	for(i = 0; i < cv->len; i++) {
-		c = cv->data[i];
-		for(j = 0; j < nelem(compressors); j++) {
-			if(compressors[j] == c)
-				return c;
-		}
-	}
-	return -1;
-}
-
-static Lock	ciphLock;
-static int	nciphers;
-
-static int
-initCiphers(void)
-{
-	enum {MaxAlgF = 1024, MaxAlgs = 10};
-	char s[MaxAlgF], *flds[MaxAlgs];
-	int i, j, n, ok;
-
-	lock(&ciphLock);
-	if(nciphers){
-		unlock(&ciphLock);
-		return nciphers;
-	}
-	j = open("#a/tls/encalgs", OREAD);
-	if(j < 0){
-		werrstr("can't open #a/tls/encalgs: %r");
-		return 0;
-	}
-	n = read(j, s, MaxAlgF-1);
-	close(j);
-	if(n <= 0){
-		werrstr("nothing in #a/tls/encalgs: %r");
-		return 0;
-	}
-	s[n] = 0;
-	n = getfields(s, flds, MaxAlgs, 1, " \t\r\n");
-	for(i = 0; i < nelem(cipherAlgs); i++){
-		ok = 0;
-		for(j = 0; j < n; j++){
-			if(strcmp(cipherAlgs[i].enc, flds[j]) == 0){
-				ok = 1;
-				break;
-			}
-		}
-		cipherAlgs[i].ok = ok;
-	}
-
-	j = open("#a/tls/hashalgs", OREAD);
-	if(j < 0){
-		werrstr("can't open #a/tls/hashalgs: %r");
-		return 0;
-	}
-	n = read(j, s, MaxAlgF-1);
-	close(j);
-	if(n <= 0){
-		werrstr("nothing in #a/tls/hashalgs: %r");
-		return 0;
-	}
-	s[n] = 0;
-	n = getfields(s, flds, MaxAlgs, 1, " \t\r\n");
-	for(i = 0; i < nelem(cipherAlgs); i++){
-		ok = 0;
-		for(j = 0; j < n; j++){
-			if(strcmp(cipherAlgs[i].digest, flds[j]) == 0){
-				ok = 1;
-				break;
-			}
-		}
-		cipherAlgs[i].ok &= ok;
-		if(cipherAlgs[i].ok)
-			nciphers++;
-	}
-	unlock(&ciphLock);
-	return nciphers;
-}
-
-static Ints*
-makeciphers(void)
-{
-	Ints *is;
-	int i, j;
-
-	is = newints(nciphers);
-	j = 0;
-	for(i = 0; i < nelem(cipherAlgs); i++){
-		if(cipherAlgs[i].ok)
-			is->data[j++] = cipherAlgs[i].tlsid;
-	}
-	return is;
-}
-
-
-
-//================= security functions ========================
-
-// given X.509 certificate, set up connection to factotum
-//	for using corresponding private key
-static AuthRpc*
-factotum_rsa_open(uchar *cert, int certlen)
-{
-	int afd;
-	char *s;
-	mpint *pub = nil;
-	RSApub *rsapub;
-	AuthRpc *rpc;
-
-	// start talking to factotum
-	if((afd = open("/mnt/factotum/rpc", ORDWR)) < 0)
-		return nil;
-	if((rpc = auth_allocrpc(afd)) == nil){
-		close(afd);
-		return nil;
-	}
-	s = "proto=rsa service=tls role=client";
-	if(auth_rpc(rpc, "start", s, strlen(s)) != ARok){
-		factotum_rsa_close(rpc);
-		return nil;
-	}
-
-	// roll factotum keyring around to match certificate
-	rsapub = X509toRSApub(cert, certlen, nil, 0);
-	while(1){
-		if(auth_rpc(rpc, "read", nil, 0) != ARok){
-			factotum_rsa_close(rpc);
-			rpc = nil;
-			goto done;
-		}
-		pub = strtomp(rpc->arg, nil, 16, nil);
-		assert(pub != nil);
-		if(mpcmp(pub,rsapub->n) == 0)
-			break;
-	}
-done:
-	mpfree(pub);
-	rsapubfree(rsapub);
-	return rpc;
-}
-
-static mpint*
-factotum_rsa_decrypt(AuthRpc *rpc, mpint *cipher)
-{
-	char *p;
-	int rv;
-
-	if((p = mptoa(cipher, 16, nil, 0)) == nil)
-		return nil;
-	rv = auth_rpc(rpc, "write", p, strlen(p));
-	free(p);
-	if(rv != ARok || auth_rpc(rpc, "read", nil, 0) != ARok)
-		return nil;
-	mpfree(cipher);
-	return strtomp(rpc->arg, nil, 16, nil);
-}
-
-static void
-factotum_rsa_close(AuthRpc*rpc)
-{
-	if(!rpc)
-		return;
-	close(rpc->afd);
-	auth_freerpc(rpc);
-}
-
-static void
-tlsPmd5(uchar *buf, int nbuf, uchar *key, int nkey, uchar *label, int nlabel, uchar *seed0, int nseed0, uchar *seed1, int nseed1)
-{
-	uchar ai[MD5dlen], tmp[MD5dlen];
-	int i, n;
-	MD5state *s;
-
-	// generate a1
-	s = hmac_md5(label, nlabel, key, nkey, nil, nil);
-	s = hmac_md5(seed0, nseed0, key, nkey, nil, s);
-	hmac_md5(seed1, nseed1, key, nkey, ai, s);
-
-	while(nbuf > 0) {
-		s = hmac_md5(ai, MD5dlen, key, nkey, nil, nil);
-		s = hmac_md5(label, nlabel, key, nkey, nil, s);
-		s = hmac_md5(seed0, nseed0, key, nkey, nil, s);
-		hmac_md5(seed1, nseed1, key, nkey, tmp, s);
-		n = MD5dlen;
-		if(n > nbuf)
-			n = nbuf;
-		for(i = 0; i < n; i++)
-			buf[i] ^= tmp[i];
-		buf += n;
-		nbuf -= n;
-		hmac_md5(ai, MD5dlen, key, nkey, tmp, nil);
-		memmove(ai, tmp, MD5dlen);
-	}
-}
-
-static void
-tlsPsha1(uchar *buf, int nbuf, uchar *key, int nkey, uchar *label, int nlabel, uchar *seed0, int nseed0, uchar *seed1, int nseed1)
-{
-	uchar ai[SHA1dlen], tmp[SHA1dlen];
-	int i, n;
-	SHAstate *s;
-
-	// generate a1
-	s = hmac_sha1(label, nlabel, key, nkey, nil, nil);
-	s = hmac_sha1(seed0, nseed0, key, nkey, nil, s);
-	hmac_sha1(seed1, nseed1, key, nkey, ai, s);
-
-	while(nbuf > 0) {
-		s = hmac_sha1(ai, SHA1dlen, key, nkey, nil, nil);
-		s = hmac_sha1(label, nlabel, key, nkey, nil, s);
-		s = hmac_sha1(seed0, nseed0, key, nkey, nil, s);
-		hmac_sha1(seed1, nseed1, key, nkey, tmp, s);
-		n = SHA1dlen;
-		if(n > nbuf)
-			n = nbuf;
-		for(i = 0; i < n; i++)
-			buf[i] ^= tmp[i];
-		buf += n;
-		nbuf -= n;
-		hmac_sha1(ai, SHA1dlen, key, nkey, tmp, nil);
-		memmove(ai, tmp, SHA1dlen);
-	}
-}
-
-// fill buf with md5(args)^sha1(args)
-static void
-tlsPRF(uchar *buf, int nbuf, uchar *key, int nkey, char *label, uchar *seed0, int nseed0, uchar *seed1, int nseed1)
-{
-	int i;
-	int nlabel = strlen(label);
-	int n = (nkey + 1) >> 1;
-
-	for(i = 0; i < nbuf; i++)
-		buf[i] = 0;
-	tlsPmd5(buf, nbuf, key, n, (uchar*)label, nlabel, seed0, nseed0, seed1, nseed1);
-	tlsPsha1(buf, nbuf, key+nkey-n, n, (uchar*)label, nlabel, seed0, nseed0, seed1, nseed1);
-}
-
-/*
- * for setting server session id's
- */
-static Lock	sidLock;
-static long	maxSid = 1;
-
-/* the keys are verified to have the same public components
- * and to function correctly with pkcs 1 encryption and decryption. */
-static TlsSec*
-tlsSecInits(int cvers, uchar *csid, int ncsid, uchar *crandom, uchar *ssid, int *nssid, uchar *srandom)
-{
-	TlsSec *sec = emalloc(sizeof(*sec));
-
-	USED(csid); USED(ncsid);  // ignore csid for now
-
-	memmove(sec->crandom, crandom, RandomSize);
-	sec->clientVers = cvers;
-
-	put32(sec->srandom, time(0));
-	genrandom(sec->srandom+4, RandomSize-4);
-	memmove(srandom, sec->srandom, RandomSize);
-
-	/*
-	 * make up a unique sid: use our pid, and and incrementing id
-	 * can signal no sid by setting nssid to 0.
-	 */
-	memset(ssid, 0, SidSize);
-	put32(ssid, getpid());
-	lock(&sidLock);
-	put32(ssid+4, maxSid++);
-	unlock(&sidLock);
-	*nssid = SidSize;
-	return sec;
-}
-
-static int
-tlsSecSecrets(TlsSec *sec, int vers, uchar *epm, int nepm, uchar *kd, int nkd)
-{
-	if(epm != nil){
-		if(setVers(sec, vers) < 0)
-			goto Err;
-		serverMasterSecret(sec, epm, nepm);
-	}else if(sec->vers != vers){
-		werrstr("mismatched session versions");
-		goto Err;
-	}
-	setSecrets(sec, kd, nkd);
-	return 0;
-Err:
-	sec->ok = -1;
-	return -1;
-}
-
-static TlsSec*
-tlsSecInitc(int cvers, uchar *crandom)
-{
-	TlsSec *sec = emalloc(sizeof(*sec));
-	sec->clientVers = cvers;
-	put32(sec->crandom, time(0));
-	genrandom(sec->crandom+4, RandomSize-4);
-	memmove(crandom, sec->crandom, RandomSize);
-	return sec;
-}
-
-static int
-tlsSecSecretc(TlsSec *sec, uchar *sid, int nsid, uchar *srandom, uchar *cert, int ncert, int vers, uchar **epm, int *nepm, uchar *kd, int nkd)
-{
-	RSApub *pub;
-
-	pub = nil;
-
-	USED(sid);
-	USED(nsid);
-	
-	memmove(sec->srandom, srandom, RandomSize);
-
-	if(setVers(sec, vers) < 0)
-		goto Err;
-
-	pub = X509toRSApub(cert, ncert, nil, 0);
-	if(pub == nil){
-		werrstr("invalid x509/rsa certificate");
-		goto Err;
-	}
-	if(clientMasterSecret(sec, pub, epm, nepm) < 0)
-		goto Err;
-	rsapubfree(pub);
-	setSecrets(sec, kd, nkd);
-	return 0;
-
-Err:
-	if(pub != nil)
-		rsapubfree(pub);
-	sec->ok = -1;
-	return -1;
-}
-
-static int
-tlsSecFinished(TlsSec *sec, MD5state md5, SHAstate sha1, uchar *fin, int nfin, int isclient)
-{
-	if(sec->nfin != nfin){
-		sec->ok = -1;
-		werrstr("invalid finished exchange");
-		return -1;
-	}
-	md5.malloced = 0;
-	sha1.malloced = 0;
-	(*sec->setFinished)(sec, md5, sha1, fin, isclient);
-	return 1;
-}
-
-static void
-tlsSecOk(TlsSec *sec)
-{
-	if(sec->ok == 0)
-		sec->ok = 1;
-}
-
-static void
-tlsSecKill(TlsSec *sec)
-{
-	if(!sec)
-		return;
-	factotum_rsa_close(sec->rpc);
-	sec->ok = -1;
-}
-
-static void
-tlsSecClose(TlsSec *sec)
-{
-	if(!sec)
-		return;
-	factotum_rsa_close(sec->rpc);
-	free(sec->server);
-	free(sec);
-}
-
-static int
-setVers(TlsSec *sec, int v)
-{
-	if(v == SSL3Version){
-		sec->setFinished = sslSetFinished;
-		sec->nfin = SSL3FinishedLen;
-		sec->prf = sslPRF;
-	}else if(v == TLSVersion){
-		sec->setFinished = tlsSetFinished;
-		sec->nfin = TLSFinishedLen;
-		sec->prf = tlsPRF;
-	}else{
-		werrstr("invalid version");
-		return -1;
-	}
-	sec->vers = v;
-	return 0;
-}
-
-/*
- * generate secret keys from the master secret.
- *
- * different crypto selections will require different amounts
- * of key expansion and use of key expansion data,
- * but it's all generated using the same function.
- */
-static void
-setSecrets(TlsSec *sec, uchar *kd, int nkd)
-{
-	(*sec->prf)(kd, nkd, sec->sec, MasterSecretSize, "key expansion",
-			sec->srandom, RandomSize, sec->crandom, RandomSize);
-}
-
-/*
- * set the master secret from the pre-master secret.
- */
-static void
-setMasterSecret(TlsSec *sec, Bytes *pm)
-{
-	(*sec->prf)(sec->sec, MasterSecretSize, pm->data, MasterSecretSize, "master secret",
-			sec->crandom, RandomSize, sec->srandom, RandomSize);
-}
-
-static void
-serverMasterSecret(TlsSec *sec, uchar *epm, int nepm)
-{
-	Bytes *pm;
-
-	pm = pkcs1_decrypt(sec, epm, nepm);
-
-	// if the client messed up, just continue as if everything is ok,
-	// to prevent attacks to check for correctly formatted messages.
-	// Hence the fprint(2,) can't be replaced by tlsError(), which sends an Alert msg to the client.
-	if(sec->ok < 0 || pm == nil || get16(pm->data) != sec->clientVers){
-		fprint(2, "serverMasterSecret failed ok=%d pm=%p pmvers=%x cvers=%x nepm=%d\n",
-			sec->ok, pm, pm ? get16(pm->data) : -1, sec->clientVers, nepm);
-		sec->ok = -1;
-		if(pm != nil)
-			freebytes(pm);
-		pm = newbytes(MasterSecretSize);
-		genrandom(pm->data, MasterSecretSize);
-	}
-	setMasterSecret(sec, pm);
-	memset(pm->data, 0, pm->len);	
-	freebytes(pm);
-}
-
-static int
-clientMasterSecret(TlsSec *sec, RSApub *pub, uchar **epm, int *nepm)
-{
-	Bytes *pm, *key;
-
-	pm = newbytes(MasterSecretSize);
-	put16(pm->data, sec->clientVers);
-	genrandom(pm->data+2, MasterSecretSize - 2);
-
-	setMasterSecret(sec, pm);
-
-	key = pkcs1_encrypt(pm, pub, 2);
-	memset(pm->data, 0, pm->len);
-	freebytes(pm);
-	if(key == nil){
-		werrstr("tls pkcs1_encrypt failed");
-		return -1;
-	}
-
-	*nepm = key->len;
-	*epm = malloc(*nepm);
-	if(*epm == nil){
-		freebytes(key);
-		werrstr("out of memory");
-		return -1;
-	}
-	memmove(*epm, key->data, *nepm);
-
-	freebytes(key);
-
-	return 1;
-}
-
-static void
-sslSetFinished(TlsSec *sec, MD5state hsmd5, SHAstate hssha1, uchar *finished, int isClient)
-{
-	DigestState *s;
-	uchar h0[MD5dlen], h1[SHA1dlen], pad[48];
-	char *label;
-
-	if(isClient)
-		label = "CLNT";
-	else
-		label = "SRVR";
-
-	md5((uchar*)label, 4, nil, &hsmd5);
-	md5(sec->sec, MasterSecretSize, nil, &hsmd5);
-	memset(pad, 0x36, 48);
-	md5(pad, 48, nil, &hsmd5);
-	md5(nil, 0, h0, &hsmd5);
-	memset(pad, 0x5C, 48);
-	s = md5(sec->sec, MasterSecretSize, nil, nil);
-	s = md5(pad, 48, nil, s);
-	md5(h0, MD5dlen, finished, s);
-
-	sha1((uchar*)label, 4, nil, &hssha1);
-	sha1(sec->sec, MasterSecretSize, nil, &hssha1);
-	memset(pad, 0x36, 40);
-	sha1(pad, 40, nil, &hssha1);
-	sha1(nil, 0, h1, &hssha1);
-	memset(pad, 0x5C, 40);
-	s = sha1(sec->sec, MasterSecretSize, nil, nil);
-	s = sha1(pad, 40, nil, s);
-	sha1(h1, SHA1dlen, finished + MD5dlen, s);
-}
-
-// fill "finished" arg with md5(args)^sha1(args)
-static void
-tlsSetFinished(TlsSec *sec, MD5state hsmd5, SHAstate hssha1, uchar *finished, int isClient)
-{
-	uchar h0[MD5dlen], h1[SHA1dlen];
-	char *label;
-
-	// get current hash value, but allow further messages to be hashed in
-	md5(nil, 0, h0, &hsmd5);
-	sha1(nil, 0, h1, &hssha1);
-
-	if(isClient)
-		label = "client finished";
-	else
-		label = "server finished";
-	tlsPRF(finished, TLSFinishedLen, sec->sec, MasterSecretSize, label, h0, MD5dlen, h1, SHA1dlen);
-}
-
-static void
-sslPRF(uchar *buf, int nbuf, uchar *key, int nkey, char *label, uchar *seed0, int nseed0, uchar *seed1, int nseed1)
-{
-	DigestState *s;
-	uchar sha1dig[SHA1dlen], md5dig[MD5dlen], tmp[26];
-	int i, n, len;
-
-	USED(label);
-	len = 1;
-	while(nbuf > 0){
-		if(len > 26)
-			return;
-		for(i = 0; i < len; i++)
-			tmp[i] = 'A' - 1 + len;
-		s = sha1(tmp, len, nil, nil);
-		s = sha1(key, nkey, nil, s);
-		s = sha1(seed0, nseed0, nil, s);
-		sha1(seed1, nseed1, sha1dig, s);
-		s = md5(key, nkey, nil, nil);
-		md5(sha1dig, SHA1dlen, md5dig, s);
-		n = MD5dlen;
-		if(n > nbuf)
-			n = nbuf;
-		memmove(buf, md5dig, n);
-		buf += n;
-		nbuf -= n;
-		len++;
-	}
-}
-
-static mpint*
-bytestomp(Bytes* bytes)
-{
-	mpint* ans;
-
-	ans = betomp(bytes->data, bytes->len, nil);
-	return ans;
-}
-
-/*
- * Convert mpint* to Bytes, putting high order byte first.
- */
-static Bytes*
-mptobytes(mpint* big)
-{
-	int n, m;
-	uchar *a;
-	Bytes* ans;
-
-	n = (mpsignif(big)+7)/8;
-	m = mptobe(big, nil, n, &a);
-	ans = makebytes(a, m);
-	return ans;
-}
-
-// Do RSA computation on block according to key, and pad
-// result on left with zeros to make it modlen long.
-static Bytes*
-rsacomp(Bytes* block, RSApub* key, int modlen)
-{
-	mpint *x, *y;
-	Bytes *a, *ybytes;
-	int ylen;
-
-	x = bytestomp(block);
-	y = rsaencrypt(key, x, nil);
-	mpfree(x);
-	ybytes = mptobytes(y);
-	ylen = ybytes->len;
-
-	if(ylen < modlen) {
-		a = newbytes(modlen);
-		memset(a->data, 0, modlen-ylen);
-		memmove(a->data+modlen-ylen, ybytes->data, ylen);
-		freebytes(ybytes);
-		ybytes = a;
-	}
-	else if(ylen > modlen) {
-		// assume it has leading zeros (mod should make it so)
-		a = newbytes(modlen);
-		memmove(a->data, ybytes->data, modlen);
-		freebytes(ybytes);
-		ybytes = a;
-	}
-	mpfree(y);
-	return ybytes;
-}
-
-// encrypt data according to PKCS#1, /lib/rfc/rfc2437 9.1.2.1
-static Bytes*
-pkcs1_encrypt(Bytes* data, RSApub* key, int blocktype)
-{
-	Bytes *pad, *eb, *ans;
-	int i, dlen, padlen, modlen;
-
-	modlen = (mpsignif(key->n)+7)/8;
-	dlen = data->len;
-	if(modlen < 12 || dlen > modlen - 11)
-		return nil;
-	padlen = modlen - 3 - dlen;
-	pad = newbytes(padlen);
-	genrandom(pad->data, padlen);
-	for(i = 0; i < padlen; i++) {
-		if(blocktype == 0)
-			pad->data[i] = 0;
-		else if(blocktype == 1)
-			pad->data[i] = 255;
-		else if(pad->data[i] == 0)
-			pad->data[i] = 1;
-	}
-	eb = newbytes(modlen);
-	eb->data[0] = 0;
-	eb->data[1] = blocktype;
-	memmove(eb->data+2, pad->data, padlen);
-	eb->data[padlen+2] = 0;
-	memmove(eb->data+padlen+3, data->data, dlen);
-	ans = rsacomp(eb, key, modlen);
-	freebytes(eb);
-	freebytes(pad);
-	return ans;
-}
-
-// decrypt data according to PKCS#1, with given key.
-// expect a block type of 2.
-static Bytes*
-pkcs1_decrypt(TlsSec *sec, uchar *epm, int nepm)
-{
-	Bytes *eb, *ans = nil;
-	int i, modlen;
-	mpint *x, *y;
-
-	modlen = (mpsignif(sec->rsapub->n)+7)/8;
-	if(nepm != modlen)
-		return nil;
-	x = betomp(epm, nepm, nil);
-	y = factotum_rsa_decrypt(sec->rpc, x);
-	if(y == nil)
-		return nil;
-	eb = mptobytes(y);
-	if(eb->len < modlen){ // pad on left with zeros
-		ans = newbytes(modlen);
-		memset(ans->data, 0, modlen-eb->len);
-		memmove(ans->data+modlen-eb->len, eb->data, eb->len);
-		freebytes(eb);
-		eb = ans;
-	}
-	if(eb->data[0] == 0 && eb->data[1] == 2) {
-		for(i = 2; i < modlen; i++)
-			if(eb->data[i] == 0)
-				break;
-		if(i < modlen - 1)
-			ans = makebytes(eb->data+i+1, modlen-(i+1));
-	}
-	freebytes(eb);
-	return ans;
-}
-
-
-//================= general utility functions ========================
-
-static void *
-emalloc(int n)
-{
-	void *p;
-	if(n==0)
-		n=1;
-	p = malloc(n);
-	if(p == nil){
-		exits("out of memory");
-	}
-	memset(p, 0, n);
-	return p;
-}
-
-static void *
-erealloc(void *ReallocP, int ReallocN)
-{
-	if(ReallocN == 0)
-		ReallocN = 1;
-	if(!ReallocP)
-		ReallocP = emalloc(ReallocN);
-	else if(!(ReallocP = realloc(ReallocP, ReallocN))){
-		exits("out of memory");
-	}
-	return(ReallocP);
-}
-
-static void
-put32(uchar *p, u32int x)
-{
-	p[0] = x>>24;
-	p[1] = x>>16;
-	p[2] = x>>8;
-	p[3] = x;
-}
-
-static void
-put24(uchar *p, int x)
-{
-	p[0] = x>>16;
-	p[1] = x>>8;
-	p[2] = x;
-}
-
-static void
-put16(uchar *p, int x)
-{
-	p[0] = x>>8;
-	p[1] = x;
-}
-
-static u32int
-get32(uchar *p)
-{
-	return (p[0]<<24)|(p[1]<<16)|(p[2]<<8)|p[3];
-}
-
-static int
-get24(uchar *p)
-{
-	return (p[0]<<16)|(p[1]<<8)|p[2];
-}
-
-static int
-get16(uchar *p)
-{
-	return (p[0]<<8)|p[1];
-}
-
-/* ANSI offsetof() */
-#define OFFSET(x, s) ((int)(&(((s*)0)->x)))
-
-/*
- * malloc and return a new Bytes structure capable of
- * holding len bytes. (len >= 0)
- * Used to use crypt_malloc, which aborts if malloc fails.
- */
-static Bytes*
-newbytes(int len)
-{
-	Bytes* ans;
-
-	ans = (Bytes*)malloc(OFFSET(data[0], Bytes) + len);
-	ans->len = len;
-	return ans;
-}
-
-/*
- * newbytes(len), with data initialized from buf
- */
-static Bytes*
-makebytes(uchar* buf, int len)
-{
-	Bytes* ans;
-
-	ans = newbytes(len);
-	memmove(ans->data, buf, len);
-	return ans;
-}
-
-static void
-freebytes(Bytes* b)
-{
-	if(b != nil)
-		free(b);
-}
-
-/* len is number of ints */
-static Ints*
-newints(int len)
-{
-	Ints* ans;
-
-	ans = (Ints*)malloc(OFFSET(data[0], Ints) + len*sizeof(int));
-	ans->len = len;
-	return ans;
-}
-
-static Ints*
-makeints(int* buf, int len)
-{
-	Ints* ans;
-
-	ans = newints(len);
-	if(len > 0)
-		memmove(ans->data, buf, len*sizeof(int));
-	return ans;
-}
-
-static void
-freeints(Ints* b)
-{
-	if(b != nil)
-		free(b);
-}