Mercurial > dropbear
view libtomcrypt/src/mac/omac/omac_done.c @ 1746:28ab2cdb84bf
Fix fuzzer build
author | Matt Johnston <matt@ucc.asn.au> |
---|---|
date | Sun, 18 Oct 2020 23:32:39 +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" /** @file omac_done.c OMAC1 support, terminate a stream, Tom St Denis */ #ifdef LTC_OMAC /** Terminate an OMAC stream @param omac The OMAC state @param out [out] Destination for the authentication tag @param outlen [in/out] The max size and resulting size of the authentication tag @return CRYPT_OK if successful */ int omac_done(omac_state *omac, unsigned char *out, unsigned long *outlen) { int err, mode; unsigned x; LTC_ARGCHK(omac != NULL); LTC_ARGCHK(out != NULL); LTC_ARGCHK(outlen != NULL); if ((err = cipher_is_valid(omac->cipher_idx)) != CRYPT_OK) { return err; } if ((omac->buflen > (int)sizeof(omac->block)) || (omac->buflen < 0) || (omac->blklen > (int)sizeof(omac->block)) || (omac->buflen > omac->blklen)) { return CRYPT_INVALID_ARG; } /* figure out mode */ if (omac->buflen != omac->blklen) { /* add the 0x80 byte */ omac->block[omac->buflen++] = 0x80; /* pad with 0x00 */ while (omac->buflen < omac->blklen) { omac->block[omac->buflen++] = 0x00; } mode = 1; } else { mode = 0; } /* now xor prev + Lu[mode] */ for (x = 0; x < (unsigned)omac->blklen; x++) { omac->block[x] ^= omac->prev[x] ^ omac->Lu[mode][x]; } /* encrypt it */ if ((err = cipher_descriptor[omac->cipher_idx].ecb_encrypt(omac->block, omac->block, &omac->key)) != CRYPT_OK) { return err; } cipher_descriptor[omac->cipher_idx].done(&omac->key); /* output it */ for (x = 0; x < (unsigned)omac->blklen && x < *outlen; x++) { out[x] = omac->block[x]; } *outlen = x; #ifdef LTC_CLEAN_STACK zeromem(omac, sizeof(*omac)); #endif return CRYPT_OK; } #endif /* ref: $Format:%D$ */ /* git commit: $Format:%H$ */ /* commit time: $Format:%ai$ */