Mercurial > dropbear

annotate libtomcrypt/src/modes/ofb/ofb_encrypt.c @ 1680:5e763ad6e2e0

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author Matt Johnston <matt@ucc.asn.au>
date Sun, 24 May 2020 13:34:19 +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 }
1471
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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54 #endif
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55
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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56 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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57 /* git commit: $Format:%H$ */
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58 /* commit time: $Format:%ai$ */