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-rw-r--r--ccast/axTLS/hmac.c105
1 files changed, 105 insertions, 0 deletions
diff --git a/ccast/axTLS/hmac.c b/ccast/axTLS/hmac.c
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+/*
+ * Copyright (c) 2007, Cameron Rich
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * * Neither the name of the axTLS project nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/**
+ * HMAC implementation - This code was originally taken from RFC2104
+ * See http://www.ietf.org/rfc/rfc2104.txt and
+ * http://www.faqs.org/rfcs/rfc2202.html
+ */
+
+#include <string.h>
+#include "os_port.h"
+#include "crypto.h"
+
+/**
+ * Perform HMAC-MD5
+ * NOTE: does not handle keys larger than the block size.
+ */
+void hmac_md5(const uint8_t *msg, int length, const uint8_t *key,
+ int key_len, uint8_t *digest)
+{
+ MD5_CTX context;
+ uint8_t k_ipad[64];
+ uint8_t k_opad[64];
+ int i;
+
+ memset(k_ipad, 0, sizeof k_ipad);
+ memset(k_opad, 0, sizeof k_opad);
+ memcpy(k_ipad, key, key_len);
+ memcpy(k_opad, key, key_len);
+
+ for (i = 0; i < 64; i++)
+ {
+ k_ipad[i] ^= 0x36;
+ k_opad[i] ^= 0x5c;
+ }
+
+ MD5_Init(&context);
+ MD5_Update(&context, k_ipad, 64);
+ MD5_Update(&context, msg, length);
+ MD5_Final(digest, &context);
+ MD5_Init(&context);
+ MD5_Update(&context, k_opad, 64);
+ MD5_Update(&context, digest, MD5_SIZE);
+ MD5_Final(digest, &context);
+}
+
+/**
+ * Perform HMAC-SHA1
+ * NOTE: does not handle keys larger than the block size.
+ */
+void hmac_sha1(const uint8_t *msg, int length, const uint8_t *key,
+ int key_len, uint8_t *digest)
+{
+ SHA1_CTX context;
+ uint8_t k_ipad[64];
+ uint8_t k_opad[64];
+ int i;
+
+ memset(k_ipad, 0, sizeof k_ipad);
+ memset(k_opad, 0, sizeof k_opad);
+ memcpy(k_ipad, key, key_len);
+ memcpy(k_opad, key, key_len);
+
+ for (i = 0; i < 64; i++)
+ {
+ k_ipad[i] ^= 0x36;
+ k_opad[i] ^= 0x5c;
+ }
+
+ SHA1_Init(&context);
+ SHA1_Update(&context, k_ipad, 64);
+ SHA1_Update(&context, msg, length);
+ SHA1_Final(digest, &context);
+ SHA1_Init(&context);
+ SHA1_Update(&context, k_opad, 64);
+ SHA1_Update(&context, digest, SHA1_SIZE);
+ SHA1_Final(digest, &context);
+}