Mercurial > dropbear

annotate libtomcrypt/src/encauth/ocb/ocb_encrypt.c @ 1699:ef57ead04987

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merge
author Matt Johnston <matt@ucc.asn.au>
date Thu, 28 May 2020 22:52:01 +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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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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10 /**
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11 @file ocb_encrypt.c
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12 OCB implementation, encrypt data, by Tom St Denis
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13 */
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14 #include "tomcrypt.h"
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16 #ifdef LTC_OCB_MODE
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18 /**
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19 Encrypt a block of data with OCB.
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20 @param ocb The OCB state
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21 @param pt The plaintext (length of the block size of the block cipher)
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22 @param ct [out] The ciphertext (same size as the pt)
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23 @return CRYPT_OK if successful
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24 */
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25 int ocb_encrypt(ocb_state *ocb, const unsigned char *pt, unsigned char *ct)
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26 {
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27 unsigned char Z[MAXBLOCKSIZE], tmp[MAXBLOCKSIZE];
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28 int err, x;
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30 LTC_ARGCHK(ocb != NULL);
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31 LTC_ARGCHK(pt != NULL);
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32 LTC_ARGCHK(ct != NULL);
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33 if ((err = cipher_is_valid(ocb->cipher)) != CRYPT_OK) {
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34 return err;
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35 }
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36 if (ocb->block_len != cipher_descriptor[ocb->cipher].block_length) {
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37 return CRYPT_INVALID_ARG;
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38 }
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40 /* compute checksum */
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41 for (x = 0; x < ocb->block_len; x++) {
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42 ocb->checksum[x] ^= pt[x];
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43 }
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45 /* Get Z[i] value */
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46 ocb_shift_xor(ocb, Z);
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48 /* xor pt in, encrypt, xor Z out */
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49 for (x = 0; x < ocb->block_len; x++) {
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50 tmp[x] = pt[x] ^ Z[x];
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51 }
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52 if ((err = cipher_descriptor[ocb->cipher].ecb_encrypt(tmp, ct, &ocb->key)) != CRYPT_OK) {
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53 return err;
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54 }
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55 for (x = 0; x < ocb->block_len; x++) {
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56 ct[x] ^= Z[x];
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57 }
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59 #ifdef LTC_CLEAN_STACK
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60 zeromem(Z, sizeof(Z));
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61 zeromem(tmp, sizeof(tmp));
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62 #endif
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63 return CRYPT_OK;
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64 }
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66 #endif
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67
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68 /* ref: $Format:%D$ */
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69 /* git commit: $Format:%H$ */
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70 /* commit time: $Format:%ai$ */