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annotate libtomcrypt/src/encauth/chachapoly/chacha20poly1305_encrypt.c @ 1659:d32bcb5c557d

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Add Ed25519 support (#91) * Add support for Ed25519 as a public key type Ed25519 is a elliptic curve signature scheme that offers better security than ECDSA and DSA and good performance. It may be used for both user and host keys. OpenSSH key import and fuzzer are not supported yet. Initially inspired by Peter Szabo. * Add curve25519 and ed25519 fuzzers * Add import and export of Ed25519 keys
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Wed, 11 Mar 2020 21:09:45 +0500
parents 6dba84798cd5
children
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1471
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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2 *
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3 * LibTomCrypt is a library that provides various cryptographic
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4 * algorithms in a highly modular and flexible manner.
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5 *
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6 * The library is free for all purposes without any express
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7 * guarantee it works.
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8 */
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9
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10 #include "tomcrypt.h"
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11
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12 #ifdef LTC_CHACHA20POLY1305_MODE
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13
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14 /**
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15 Encrypt bytes of ciphertext with ChaCha20Poly1305
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16 @param st The ChaCha20Poly1305 state
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17 @param in The plaintext
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18 @param inlen The length of the input (octets)
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19 @param out [out] The ciphertext (length inlen)
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20 @return CRYPT_OK if successful
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21 */
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22 int chacha20poly1305_encrypt(chacha20poly1305_state *st, const unsigned char *in, unsigned long inlen, unsigned char *out)
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23 {
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24 unsigned char padzero[16] = { 0 };
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25 unsigned long padlen;
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26 int err;
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27
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28 if (inlen == 0) return CRYPT_OK; /* nothing to do */
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29 LTC_ARGCHK(st != NULL);
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30
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31 if ((err = chacha_crypt(&st->chacha, in, inlen, out)) != CRYPT_OK) return err;
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32 if (st->aadflg) {
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33 padlen = 16 - (unsigned long)(st->aadlen % 16);
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34 if (padlen < 16) {
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35 if ((err = poly1305_process(&st->poly, padzero, padlen)) != CRYPT_OK) return err;
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36 }
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37 st->aadflg = 0; /* no more AAD */
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38 }
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39 if ((err = poly1305_process(&st->poly, out, inlen)) != CRYPT_OK) return err;
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40 st->ctlen += (ulong64)inlen;
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41 return CRYPT_OK;
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42 }
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43
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44 #endif
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45
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46 /* ref: $Format:%D$ */
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47 /* git commit: $Format:%H$ */
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48 /* commit time: $Format:%ai$ */