Mercurial > dropbear

annotate libtomcrypt/src/modes/ofb/ofb_encrypt.c @ 1902:4a6725ac957c

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Revert "Don't include sk keys at all in KEX list" This reverts git commit f972813ecdc7bb981d25b5a63638bd158f1c8e72. The sk algorithms need to remain in the sigalgs list so that they are included in the server-sig-algs ext-info message sent by the server. RFC8308 for server-sig-algs requires that all algorithms are listed (though OpenSSH client 8.4p1 tested doesn't require that)
author Matt Johnston <matt@ucc.asn.au>
date Thu, 24 Mar 2022 13:42:08 +0800
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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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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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53
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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: $Format:%ai$ */