| /* 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@iahu.ca, http://libtomcrypt.org |
| */ |
| /* OMAC1 Support by Tom St Denis (for 64 and 128 bit block ciphers only) */ |
| #include "mycrypt.h" |
| |
| #ifdef OMAC |
| |
| int omac_memory(int cipher, |
| const unsigned char *key, unsigned long keylen, |
| const unsigned char *msg, unsigned long msglen, |
| unsigned char *out, unsigned long *outlen) |
| { |
| int err; |
| omac_state *omac; |
| |
| _ARGCHK(key != NULL); |
| _ARGCHK(msg != NULL); |
| _ARGCHK(out != NULL); |
| _ARGCHK(outlen != NULL); |
| |
| /* allocate ram for omac state */ |
| omac = XMALLOC(sizeof(omac_state)); |
| if (omac == NULL) { |
| return CRYPT_MEM; |
| } |
| |
| /* omac process the message */ |
| if ((err = omac_init(omac, cipher, key, keylen)) != CRYPT_OK) { |
| goto __ERR; |
| } |
| if ((err = omac_process(omac, msg, msglen)) != CRYPT_OK) { |
| goto __ERR; |
| } |
| if ((err = omac_done(omac, out, outlen)) != CRYPT_OK) { |
| goto __ERR; |
| } |
| |
| err = CRYPT_OK; |
| __ERR: |
| #ifdef CLEAN_STACK |
| zeromem(omac, sizeof(omac_state)); |
| #endif |
| |
| XFREE(omac); |
| return err; |
| } |
| |
| #endif |