Mercurial > dropbear
view libtomcrypt/src/mac/hmac/hmac_memory.c @ 652:17962b2a6b8f
- Make sure we don't use channel-specific data after it has been freed
with a ChanType->closehandler()
author | Matt Johnston <matt@ucc.asn.au> |
---|---|
date | Sun, 04 Dec 2011 05:27:29 +0800 (2011-12-03) |
parents | 0cbe8f6dbf9e |
children | f849a5ca2efc |
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/* LibTomCrypt, modular cryptographic library -- Tom St Denis * * LibTomCrypt is a library that provides various cryptographic * algorithms in a highly modular and flexible manner. * * The library is free for all purposes without any express * guarantee it works. * * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.com */ #include "tomcrypt.h" /** @file hmac_memory.c HMAC support, process a block of memory, Tom St Denis/Dobes Vandermeer */ #ifdef LTC_HMAC /** HMAC a block of memory to produce the authentication tag @param hash The index of the hash to use @param key The secret key @param keylen The length of the secret key (octets) @param in The data to HMAC @param inlen The length of the data to HMAC (octets) @param out [out] Destination of the authentication tag @param outlen [in/out] Max size and resulting size of authentication tag @return CRYPT_OK if successful */ int hmac_memory(int hash, const unsigned char *key, unsigned long keylen, const unsigned char *in, unsigned long inlen, unsigned char *out, unsigned long *outlen) { hmac_state *hmac; int err; LTC_ARGCHK(key != NULL); LTC_ARGCHK(in != NULL); LTC_ARGCHK(out != NULL); LTC_ARGCHK(outlen != NULL); /* make sure hash descriptor is valid */ if ((err = hash_is_valid(hash)) != CRYPT_OK) { return err; } /* is there a descriptor? */ if (hash_descriptor[hash].hmac_block != NULL) { return hash_descriptor[hash].hmac_block(key, keylen, in, inlen, out, outlen); } /* nope, so call the hmac functions */ /* allocate ram for hmac state */ hmac = XMALLOC(sizeof(hmac_state)); if (hmac == NULL) { return CRYPT_MEM; } if ((err = hmac_init(hmac, hash, key, keylen)) != CRYPT_OK) { goto LBL_ERR; } if ((err = hmac_process(hmac, in, inlen)) != CRYPT_OK) { goto LBL_ERR; } if ((err = hmac_done(hmac, out, outlen)) != CRYPT_OK) { goto LBL_ERR; } err = CRYPT_OK; LBL_ERR: #ifdef LTC_CLEAN_STACK zeromem(hmac, sizeof(hmac_state)); #endif XFREE(hmac); return err; } #endif /* $Source: /cvs/libtom/libtomcrypt/src/mac/hmac/hmac_memory.c,v $ */ /* $Revision: 1.6 $ */ /* $Date: 2006/11/03 00:39:49 $ */