Mercurial > dropbear
view libtomcrypt/src/mac/xcbc/xcbc_memory_multi.c @ 1552:e46f7f1da56a
CHANGES for 2018.76
author | Matt Johnston <matt@ucc.asn.au> |
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date | Tue, 27 Feb 2018 22:14:04 +0800 |
parents | 6dba84798cd5 |
children |
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/* 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. */ #include "tomcrypt.h" #include <stdarg.h> /** @file xcbc_memory_multi.c XCBC support, process multiple blocks of memory, Tom St Denis */ #ifdef LTC_XCBC /** XCBC multiple blocks of memory @param cipher The index of the desired cipher @param key The secret key @param keylen The length of the secret key (octets) @param out [out] The destination of the authentication tag @param outlen [in/out] The max size and resulting size of the authentication tag (octets) @param in The data to send through XCBC @param inlen The length of the data to send through XCBC (octets) @param ... tuples of (data,len) pairs to XCBC, terminated with a (NULL,x) (x=don't care) @return CRYPT_OK if successful */ int xcbc_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; xcbc_state *xcbc; 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 xcbc state */ xcbc = XMALLOC(sizeof(xcbc_state)); if (xcbc == NULL) { return CRYPT_MEM; } /* xcbc process the message */ if ((err = xcbc_init(xcbc, cipher, key, keylen)) != CRYPT_OK) { goto LBL_ERR; } va_start(args, inlen); curptr = in; curlen = inlen; for (;;) { /* process buf */ if ((err = xcbc_process(xcbc, 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 = xcbc_done(xcbc, out, outlen)) != CRYPT_OK) { goto LBL_ERR; } LBL_ERR: #ifdef LTC_CLEAN_STACK zeromem(xcbc, sizeof(xcbc_state)); #endif XFREE(xcbc); va_end(args); return err; } #endif /* ref: $Format:%D$ */ /* git commit: $Format:%H$ */ /* commit time: $Format:%ai$ */