| /* 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.org |
| */ |
| #include "tomcrypt.h" |
| |
| /** |
| @file hmac_memory.c |
| HMAC support, process a block of memory, Tom St Denis/Dobes Vandermeer |
| */ |
| |
| #ifdef 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); |
| |
| /* 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: 1.3 $ */ |
| /* $Date: 2005/05/05 14:35:58 $ */ |