Import sources from 2011-03-30 iso image

1 files changed, 41 insertions, 0 deletions

diff --git a/sys/src/libsec/port/hmac.c b/sys/src/libsec/port/hmac.c
new file mode 100755
index 000000000..aa2fa03f6
--- /dev/null
+++ b/sys/src/libsec/port/hmac.c
@@ -0,0 +1,41 @@
+#include "os.h"
+#include <libsec.h>
+
+/* rfc2104 */
+DigestState*
+hmac_x(uchar *p, ulong len, uchar *key, ulong klen, uchar *digest, DigestState *s,
+	DigestState*(*x)(uchar*, ulong, uchar*, DigestState*), int xlen)
+{
+	int i;
+	uchar pad[Hmacblksz+1], innerdigest[256];
+
+	if(xlen > sizeof(innerdigest))
+		return nil;
+	if(klen > Hmacblksz)
+		return nil;
+
+	/* first time through */
+	if(s == nil || s->seeded == 0){
+		memset(pad, 0x36, Hmacblksz);
+		pad[Hmacblksz] = 0;
+		for(i = 0; i < klen; i++)
+			pad[i] ^= key[i];
+		s = (*x)(pad, Hmacblksz, nil, s);
+		if(s == nil)
+			return nil;
+	}
+
+	s = (*x)(p, len, nil, s);
+	if(digest == nil)
+		return s;
+
+	/* last time through */
+	memset(pad, 0x5c, Hmacblksz);
+	pad[Hmacblksz] = 0;
+	for(i = 0; i < klen; i++)
+		pad[i] ^= key[i];
+	(*x)(nil, 0, innerdigest, s);
+	s = (*x)(pad, Hmacblksz, nil, nil);
+	(*x)(innerdigest, xlen, digest, s);
+	return nil;
+}