| /* 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" |
| #include <stdarg.h> |
| |
| /** |
| @file pmac_memory_multi.c |
| PMAC implementation, process multiple blocks of memory, by Tom St Denis |
| */ |
| |
| #ifdef PMAC |
| |
| /** |
| PMAC multiple blocks of memory |
| @param cipher The index of the cipher desired |
| @param key The secret key |
| @param keylen The length of the secret key (octets) |
| @param out [out] Destination for the authentication tag |
| @param outlen [in/out] The max size and resulting size of the authentication tag |
| @param in The data you wish to send through PMAC |
| @param inlen The length of data you wish to send through PMAC (octets) |
| @param ... tuples of (data,len) pairs to PMAC, terminated with a (NULL,x) (x=don't care) |
| @return CRYPT_OK if successful |
| */ |
| int pmac_memory_multi(int cipher, |
| const unsigned char *key, unsigned long keylen, |
| unsigned char *out, unsigned long *outlen, |
| const unsigned char *in, unsigned long inlen, ...) |
| { |
| int err; |
| pmac_state *pmac; |
| 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 pmac state */ |
| pmac = XMALLOC(sizeof(pmac_state)); |
| if (pmac == NULL) { |
| return CRYPT_MEM; |
| } |
| |
| if ((err = pmac_init(pmac, cipher, key, keylen)) != CRYPT_OK) { |
| goto LBL_ERR; |
| } |
| va_start(args, inlen); |
| curptr = in; |
| curlen = inlen; |
| for (;;) { |
| /* process buf */ |
| if ((err = pmac_process(pmac, 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 = pmac_done(pmac, out, outlen)) != CRYPT_OK) { |
| goto LBL_ERR; |
| } |
| LBL_ERR: |
| #ifdef LTC_CLEAN_STACK |
| zeromem(pmac, sizeof(pmac_state)); |
| #endif |
| XFREE(pmac); |
| va_end(args); |
| return err; |
| } |
| |
| #endif |
| |
| /* $Source: /cvs/libtom/libtomcrypt/src/mac/pmac/pmac_memory_multi.c,v $ */ |
| /* $Revision: 1.4 $ */ |
| /* $Date: 2005/05/05 14:35:59 $ */ |