Mercurial > dropbear

annotate libtomcrypt/src/modes/ofb/ofb_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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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 #include "tomcrypt.h"
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11 /**
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12 @file ofb_encrypt.c
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13 OFB implementation, encrypt data, Tom St Denis
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14 */
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16 #ifdef LTC_OFB_MODE
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18 /**
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19 OFB encrypt
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20 @param pt Plaintext
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21 @param ct [out] Ciphertext
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22 @param len Length of plaintext (octets)
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23 @param ofb OFB state
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24 @return CRYPT_OK if successful
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25 */
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26 int ofb_encrypt(const unsigned char *pt, unsigned char *ct, unsigned long len, symmetric_OFB *ofb)
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27 {
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28 int err;
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29 LTC_ARGCHK(pt != NULL);
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30 LTC_ARGCHK(ct != NULL);
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31 LTC_ARGCHK(ofb != NULL);
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32 if ((err = cipher_is_valid(ofb->cipher)) != CRYPT_OK) {
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33 return err;
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34 }
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35
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36 /* is blocklen/padlen valid? */
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37 if (ofb->blocklen < 0 || ofb->blocklen > (int)sizeof(ofb->IV) ||
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38 ofb->padlen < 0 || ofb->padlen > (int)sizeof(ofb->IV)) {
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39 return CRYPT_INVALID_ARG;
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40 }
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41
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42 while (len-- > 0) {
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43 if (ofb->padlen == ofb->blocklen) {
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44 if ((err = cipher_descriptor[ofb->cipher].ecb_encrypt(ofb->IV, ofb->IV, &ofb->key)) != CRYPT_OK) {
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45 return err;
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46 }
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47 ofb->padlen = 0;
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48 }
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49 *ct++ = *pt++ ^ ofb->IV[(ofb->padlen)++];
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50 }
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51 return CRYPT_OK;
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52 }
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54 #endif
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55
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56 /* ref: $Format:%D$ */
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57 /* git commit: $Format:%H$ */
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58 /* commit time: $Format:%ai$ */