Mercurial > dropbear
view libtomcrypt/src/encauth/ccm/ccm_add_aad.c @ 1772:0cc85b4a4abb
Move fuzzer-kex initialisation into a constructor function
Hopefully this can avoid hitting AFL timeouts
https://github.com/google/oss-fuzz/pull/2474
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 29 Oct 2020 23:00:52 +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" #ifdef LTC_CCM_MODE /** Add AAD to the CCM state @param ccm The CCM state @param adata The additional authentication data to add to the CCM state @param adatalen The length of the AAD data. @return CRYPT_OK on success */ int ccm_add_aad(ccm_state *ccm, const unsigned char *adata, unsigned long adatalen) { unsigned long y; int err; LTC_ARGCHK(ccm != NULL); LTC_ARGCHK(adata != NULL); if (ccm->aadlen < ccm->current_aadlen + adatalen) { return CRYPT_INVALID_ARG; } ccm->current_aadlen += adatalen; /* now add the data */ for (y = 0; y < adatalen; y++) { if (ccm->x == 16) { /* full block so let's encrypt it */ if ((err = cipher_descriptor[ccm->cipher].ecb_encrypt(ccm->PAD, ccm->PAD, &ccm->K)) != CRYPT_OK) { return err; } ccm->x = 0; } ccm->PAD[ccm->x++] ^= adata[y]; } /* remainder? */ if (ccm->aadlen == ccm->current_aadlen) { if (ccm->x != 0) { if ((err = cipher_descriptor[ccm->cipher].ecb_encrypt(ccm->PAD, ccm->PAD, &ccm->K)) != CRYPT_OK) { return err; } } ccm->x = 0; } return CRYPT_OK; } #endif /* ref: $Format:%D$ */ /* git commit: $Format:%H$ */ /* commit time: $Format:%ai$ */