Mercurial > dropbear
annotate libtomcrypt/src/modes/ofb/ofb_encrypt.c @ 1893:180e580778df
Added DEBUG1,DEBUG2,DEBUG3 to separate functions while keeping TRACE and TRACE2.
author | HansH111 <hans@atbas.org> |
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date | Sat, 19 Mar 2022 09:01:05 +0000 |
parents | 6dba84798cd5 |
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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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10 |
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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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15 |
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16 #ifdef LTC_OFB_MODE |
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17 |
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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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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: $Format:%ai$ */ |