1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis 2 * 3 * LibTomCrypt is a library that provides various cryptographic 4 * algorithms in a highly modular and flexible manner. 5 * 6 * The library is free for all purposes without any express 7 * guarantee it works. 8 * 9 * Tom St Denis, tomstdenis (at) gmail.com, http://libtomcrypt.com 10 */ 11 #include "tomcrypt.h" 12 #include <stdarg.h> 13 14 /** 15 @file pmac_memory_multi.c 16 PMAC implementation, process multiple blocks of memory, by Tom St Denis 17 */ 18 19 #ifdef LTC_PMAC 20 21 /** 22 PMAC multiple blocks of memory 23 @param cipher The index of the cipher desired 24 @param key The secret key 25 @param keylen The length of the secret key (octets) 26 @param out [out] Destination for the authentication tag 27 @param outlen [in/out] The max size and resulting size of the authentication tag 28 @param in The data you wish to send through PMAC 29 @param inlen The length of data you wish to send through PMAC (octets) 30 @param ... tuples of (data,len) pairs to PMAC, terminated with a (NULL,x) (x=don't care) 31 @return CRYPT_OK if successful 32 */ 33 int pmac_memory_multi(int cipher, 34 const unsigned char *key, unsigned long keylen, 35 unsigned char *out, unsigned long *outlen, 36 const unsigned char *in, unsigned long inlen, ...) 37 { 38 int err; 39 pmac_state *pmac; 40 va_list args; 41 const unsigned char *curptr; 42 unsigned long curlen; 43 44 LTC_ARGCHK(key != NULL); 45 LTC_ARGCHK(in != NULL); 46 LTC_ARGCHK(out != NULL); 47 LTC_ARGCHK(outlen != NULL); 48 49 /* allocate ram for pmac state */ 50 pmac = XMALLOC(sizeof(pmac_state)); 51 if (pmac == NULL) { 52 return CRYPT_MEM; 53 } 54 55 if ((err = pmac_init(pmac, cipher, key, keylen)) != CRYPT_OK) { 56 goto LBL_ERR; 57 } 58 va_start(args, inlen); 59 curptr = in; 60 curlen = inlen; 61 for (;;) { 62 /* process buf */ 63 if ((err = pmac_process(pmac, curptr, curlen)) != CRYPT_OK) { 64 goto LBL_ERR; 65 } 66 /* step to next */ 67 curptr = va_arg(args, const unsigned char*); 68 if (curptr == NULL) { 69 break; 70 } 71 curlen = va_arg(args, unsigned long); 72 } 73 if ((err = pmac_done(pmac, out, outlen)) != CRYPT_OK) { 74 goto LBL_ERR; 75 } 76 LBL_ERR: 77 #ifdef LTC_CLEAN_STACK 78 zeromem(pmac, sizeof(pmac_state)); 79 #endif 80 XFREE(pmac); 81 va_end(args); 82 return err; 83 } 84 85 #endif 86 87 /* $Source: /cvs/libtom/libtomcrypt/src/mac/pmac/pmac_memory_multi.c,v $ */ 88 /* $Revision: 1.6 $ */ 89 /* $Date: 2006/11/03 00:39:49 $ */ 90
