[Dovecot] [PATCH 3/10] NTLM, HMAC-MD5 code

[Andrey Panin]

This patch adds HMAC-MD5 code, which is used in NTLMv2 response calculation.


 src/lib-ntlm/hmac-md5.c |   48 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/lib-ntlm/hmac-md5.h |   21 +++++++++++++++++++++
 2 files changed, 69 insertions(+)

diff -urpNX /usr/share/dontdiff dovecot-1.0-test30.vanilla/src/lib-ntlm/hmac-md5.c dovecot-1.0-test30/src/lib-ntlm/hmac-md5.c
--- dovecot-1.0-test30.vanilla/src/lib-ntlm/hmac-md5.c	1970-01-01 03:00:00.000000000 +0300
+++ dovecot-1.0-test30/src/lib-ntlm/hmac-md5.c	2004-07-27 14:04:24.000000000 +0400
@@ -0,0 +1,48 @@
+/*
+ * HMAC-MD5 (RFC-2104) implementation.
+ *
+ * Copyright (c) 2004 Andrey Panin <pazke at donpac.ru>
+ *
+ * This library is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published 
+ * by the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include "lib.h"
+#include "hmac-md5.h"
+
+void hmac_md5_init(struct hmac_md5_context *ctx,
+		   const unsigned char * key, size_t key_len)
+{
+	int i;
+	unsigned char md5key[16];
+
+	if (key_len > 64) {
+		md5_get_digest(key, key_len, md5key);
+		key = md5key;
+		key_len = 16;
+	}
+
+	memcpy(ctx->k_ipad, key, key_len);
+	memset(ctx->k_ipad + key_len, 0, 64 - key_len);
+	memcpy(ctx->k_opad, ctx->k_ipad, 64);
+
+	for (i = 0; i < 64; i++) {
+		ctx->k_ipad[i] ^= 0x36;
+		ctx->k_opad[i] ^= 0x5c;
+	}
+
+	md5_init(&ctx->ctx);
+	md5_update(&ctx->ctx, ctx->k_ipad, 64);  
+}
+
+void hmac_md5_final(struct hmac_md5_context *ctx, unsigned char *digest)
+{
+	md5_final(&ctx->ctx, digest);
+
+	md5_init(&ctx->ctx);
+	md5_update(&ctx->ctx, ctx->k_opad, 64);   
+	md5_update(&ctx->ctx, digest, 16); 
+	md5_final(&ctx->ctx, digest);
+}
diff -urpNX /usr/share/dontdiff dovecot-1.0-test30.vanilla/src/lib-ntlm/hmac-md5.h dovecot-1.0-test30/src/lib-ntlm/hmac-md5.h
--- dovecot-1.0-test30.vanilla/src/lib-ntlm/hmac-md5.h	1970-01-01 03:00:00.000000000 +0300
+++ dovecot-1.0-test30/src/lib-ntlm/hmac-md5.h	2004-07-27 10:13:15.000000000 +0400
@@ -0,0 +1,21 @@
+#ifndef __HMAC_MD5_H__
+#define __HMAC_MD5_H__
+
+#include "md5.h"
+
+struct hmac_md5_context {
+	struct md5_context ctx;
+	unsigned char k_ipad[64];
+	unsigned char k_opad[64];
+};
+
+void hmac_md5_init(struct hmac_md5_context *ctx, const unsigned char* key, size_t key_len);
+void hmac_md5_final(struct hmac_md5_context *ctx, unsigned char *digest);
+
+static inline void
+hmac_md5_update(struct hmac_md5_context *ctx, const void * data, size_t size)
+{
+	md5_update(&ctx->ctx, data, size);
+}
+
+#endif /* __HMAC_MD5_H__ */