1 files changed, 87 insertions, 0 deletions
diff --git a/source4/lib/crypto/hmacsha1.c b/source4/lib/crypto/hmacsha1.c
new file mode 100644
index 0000000000..c3d2ba403a
--- /dev/null
+++ b/source4/lib/crypto/hmacsha1.c
@@ -0,0 +1,87 @@
+/* 
+   Unix SMB/CIFS implementation.
+   Interface header:    HMAC SHA-1 code
+   Copyright (C) Stefan Metzmacher
+   
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+/*
+ taken direct from rfc2202 implementation and modified for suitable use
+ */
+
+#include "includes.h"
+#include "lib/crypto/crypto.h"
+
+/***********************************************************************
+ the rfc 2104/2202 version of hmac_sha1 initialisation.
+***********************************************************************/
+_PUBLIC_ void hmac_sha1_init(const uint8_t *key, size_t key_len, struct HMACSHA1Context *ctx)
+{
+        int i;
+	uint8_t tk[SHA1HashSize];
+
+        /* if key is longer than 64 bytes reset it to key=MD5(key) */
+        if (key_len > 64)
+	{
+                struct SHA1Context tctx;
+
+                SHA1Init(&tctx);
+                SHA1Update(&tctx, key, key_len);
+                SHA1Final(tk, &tctx);
+
+                key = tk;
+                key_len = SHA1HashSize;
+        }
+
+        /* start out by storing key in pads */
+        ZERO_STRUCT(ctx->k_ipad);
+        ZERO_STRUCT(ctx->k_opad);
+        memcpy( ctx->k_ipad, key, key_len);
+        memcpy( ctx->k_opad, key, key_len);
+
+        /* XOR key with ipad and opad values */
+        for (i=0; i<64; i++)
+	{
+                ctx->k_ipad[i] ^= 0x36;
+                ctx->k_opad[i] ^= 0x5c;
+        }
+
+        SHA1Init(&ctx->ctx);
+        SHA1Update(&ctx->ctx, ctx->k_ipad, 64);  
+}
+
+/***********************************************************************
+ update hmac_sha1 "inner" buffer
+***********************************************************************/
+_PUBLIC_ void hmac_sha1_update(const uint8_t *data, size_t data_len, struct HMACSHA1Context *ctx)
+{
+        SHA1Update(&ctx->ctx, data, data_len); /* then text of datagram */
+}
+
+/***********************************************************************
+ finish off hmac_sha1 "inner" buffer and generate outer one.
+***********************************************************************/
+_PUBLIC_ void hmac_sha1_final(uint8_t digest[SHA1HashSize], struct HMACSHA1Context *ctx)
+{
+        struct SHA1Context ctx_o;
+
+        SHA1Final(digest, &ctx->ctx);
+
+        SHA1Init(&ctx_o);
+        SHA1Update(&ctx_o, ctx->k_opad, 64);
+        SHA1Update(&ctx_o, digest, SHA1HashSize);
+        SHA1Final(digest, &ctx_o);
+}