| /* 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" |
| #include <stdarg.h> |
| |
| /** |
| @file hmac_memory_multi.c |
| HMAC support, process multiple blocks of memory, Tom St Denis/Dobes Vandermeer |
| */ |
| |
| #ifdef LTC_HMAC |
| |
| /** |
| HMAC multiple blocks 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 out [out] Destination of the authentication tag |
| @param outlen [in/out] Max size and resulting size of authentication tag |
| @param in The data to HMAC |
| @param inlen The length of the data to HMAC (octets) |
| @param ... tuples of (data,len) pairs to HMAC, terminated with a (NULL,x) (x=don't care) |
| @return CRYPT_OK if successful |
| */ |
| int hmac_memory_multi(int hash, |
| const unsigned char *key, unsigned long keylen, |
| unsigned char *out, unsigned long *outlen, |
| const unsigned char *in, unsigned long inlen, ...) |
| |
| { |
| hmac_state *hmac; |
| int err; |
| va_list args; |
| const unsigned char *curptr; |
| unsigned long curlen; |
| |
| 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; |
| } |
| |
| va_start(args, inlen); |
| curptr = in; |
| curlen = inlen; |
| for (;;) { |
| /* process buf */ |
| if ((err = hmac_process(hmac, curptr, curlen)) != CRYPT_OK) { |
| goto LBL_ERR; |
| } |
| /* step to next */ |
| curptr = va_arg(args, const unsigned char*); |
| if (curptr == NULL) { |
| break; |
| } |
| curlen = va_arg(args, unsigned long); |
| } |
| if ((err = hmac_done(hmac, out, outlen)) != CRYPT_OK) { |
| goto LBL_ERR; |
| } |
| LBL_ERR: |
| #ifdef LTC_CLEAN_STACK |
| zeromem(hmac, sizeof(hmac_state)); |
| #endif |
| XFREE(hmac); |
| va_end(args); |
| return err; |
| } |
| |
| #endif |
| |
| |
| /* $Source: /cvs/libtom/libtomcrypt/src/mac/hmac/hmac_memory_multi.c,v $ */ |
| /* $Revision: 1.5 $ */ |
| /* $Date: 2006/11/03 00:39:49 $ */ |