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* Initial crack at TLS 1.2 client side only (server side is seriously broken).

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git-svn-id: svn://svn.code.sf.net/p/axtls/code/trunk@263 9a5d90b5-6617-0410-8a86-bb477d3ed2e3
This commit is contained in:
cameronrich
2016-07-27 11:05:09 +00:00
committed by Yasuki Ikeuchi
parent abda243710
commit d476a79411
7 changed files with 262 additions and 119 deletions
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36
crypto/hmac.c
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2007, Cameron Rich
* Copyright (c) 2007-2016, Cameron Rich
*
* All rights reserved.
*
@ -103,3 +103,37 @@ void hmac_sha1(const uint8_t *msg, int length, const uint8_t *key,
SHA1_Update(&context, digest, SHA1_SIZE);
SHA1_Final(digest, &context);
}
/**
* Perform HMAC-SHA256
* NOTE: does not handle keys larger than the block size.
*/
void hmac_sha256(const uint8_t *msg, int length, const uint8_t *key,
int key_len, uint8_t *digest)
{
SHA256_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;
}
SHA256_Init(&context);
SHA256_Update(&context, k_ipad, 64);
SHA256_Update(&context, msg, length);
SHA256_Final(digest, &context);
SHA256_Init(&context);
SHA256_Update(&context, k_opad, 64);
SHA256_Update(&context, digest, SHA256_SIZE);
SHA256_Final(digest, &context);
}