Mercurial > dropbear
view libtomcrypt/src/encauth/chachapoly/chacha20poly1305_done.c @ 1606:98d2b125eb89
kexhashbuf was much to small in kex fuzzers
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 08 Mar 2018 23:23:19 +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_CHACHA20POLY1305_MODE /** Terminate a ChaCha20Poly1305 stream @param st The ChaCha20Poly1305 state @param tag [out] The destination for the MAC tag @param taglen [in/out] The length of the MAC tag @return CRYPT_OK on success */ int chacha20poly1305_done(chacha20poly1305_state *st, unsigned char *tag, unsigned long *taglen) { unsigned char padzero[16] = { 0 }; unsigned long padlen; unsigned char buf[16]; int err; LTC_ARGCHK(st != NULL); padlen = 16 - (unsigned long)(st->ctlen % 16); if (padlen < 16) { if ((err = poly1305_process(&st->poly, padzero, padlen)) != CRYPT_OK) return err; } STORE64L(st->aadlen, buf); STORE64L(st->ctlen, buf + 8); if ((err = poly1305_process(&st->poly, buf, 16)) != CRYPT_OK) return err; if ((err = poly1305_done(&st->poly, tag, taglen)) != CRYPT_OK) return err; if ((err = chacha_done(&st->chacha)) != CRYPT_OK) return err; return CRYPT_OK; } #endif /* ref: $Format:%D$ */ /* git commit: $Format:%H$ */ /* commit time: $Format:%ai$ */