Mercurial > dropbear
view libtomcrypt/src/mac/omac/omac_file.c @ 1938:77bc00dcc19f default tip main master
Bump version to 2022.82
author | Matt Johnston <matt@ucc.asn.au> |
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date | Fri, 01 Apr 2022 14:43:27 +0800 |
parents | e9dba7abd939 |
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" /** @file omac_file.c OMAC1 support, process a file, Tom St Denis */ #ifdef LTC_OMAC /** OMAC a file @param cipher The index of the cipher desired @param key The secret key @param keylen The length of the secret key (octets) @param filename The name of the file you wish to OMAC @param out [out] Where the authentication tag is to be stored @param outlen [in/out] The max size and resulting size of the authentication tag @return CRYPT_OK if successful, CRYPT_NOP if file support has been disabled */ int omac_file(int cipher, const unsigned char *key, unsigned long keylen, const char *filename, unsigned char *out, unsigned long *outlen) { #ifdef LTC_NO_FILE LTC_UNUSED_PARAM(cipher); LTC_UNUSED_PARAM(key); LTC_UNUSED_PARAM(keylen); LTC_UNUSED_PARAM(filename); LTC_UNUSED_PARAM(out); LTC_UNUSED_PARAM(outlen); return CRYPT_NOP; #else size_t x; int err; omac_state omac; FILE *in; unsigned char *buf; LTC_ARGCHK(key != NULL); LTC_ARGCHK(filename != NULL); LTC_ARGCHK(out != NULL); LTC_ARGCHK(outlen != NULL); if ((buf = XMALLOC(LTC_FILE_READ_BUFSIZE)) == NULL) { return CRYPT_MEM; } if ((err = omac_init(&omac, cipher, key, keylen)) != CRYPT_OK) { goto LBL_ERR; } in = fopen(filename, "rb"); if (in == NULL) { err = CRYPT_FILE_NOTFOUND; goto LBL_ERR; } do { x = fread(buf, 1, LTC_FILE_READ_BUFSIZE, in); if ((err = omac_process(&omac, buf, (unsigned long)x)) != CRYPT_OK) { fclose(in); goto LBL_CLEANBUF; } } while (x == LTC_FILE_READ_BUFSIZE); if (fclose(in) != 0) { err = CRYPT_ERROR; goto LBL_CLEANBUF; } err = omac_done(&omac, out, outlen); LBL_CLEANBUF: zeromem(buf, LTC_FILE_READ_BUFSIZE); LBL_ERR: #ifdef LTC_CLEAN_STACK zeromem(&omac, sizeof(omac_state)); #endif XFREE(buf); return err; #endif } #endif /* ref: $Format:%D$ */ /* git commit: $Format:%H$ */ /* commit time: $Format:%ai$ */