Mercurial > dropbear

annotate libtomcrypt/src/encauth/ocb/ocb_encrypt_authenticate_memory.c @ 1471:6dba84798cd5

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Update to libtomcrypt 1.18.1, merged with Dropbear changes
author Matt Johnston <matt@ucc.asn.au>
date Fri, 09 Feb 2018 21:44:05 +0800
parents f849a5ca2efc
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
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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10 /**
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11 @file ocb_encrypt_authenticate_memory.c
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12 OCB implementation, encrypt block of memory, by Tom St Denis
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13 */
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14 #include "tomcrypt.h"
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15
1435
f849a5ca2efc update to libtomcrypt 1.17 (with Dropbear changes)
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16 #ifdef LTC_OCB_MODE
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17
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18 /**
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19 Encrypt and generate an authentication code for a buffer of memory
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20 @param cipher The index of the cipher desired
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21 @param key The secret key
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22 @param keylen The length of the secret key (octets)
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23 @param nonce The session nonce (length of the block ciphers block size)
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24 @param pt The plaintext
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25 @param ptlen The length of the plaintext (octets)
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26 @param ct [out] The ciphertext
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27 @param tag [out] The authentication tag
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28 @param taglen [in/out] The max size and resulting size of the authentication tag
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29 @return CRYPT_OK if successful
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30 */
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31 int ocb_encrypt_authenticate_memory(int cipher,
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32 const unsigned char *key, unsigned long keylen,
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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33 const unsigned char *nonce,
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34 const unsigned char *pt, unsigned long ptlen,
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35 unsigned char *ct,
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36 unsigned char *tag, unsigned long *taglen)
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37 {
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38 int err;
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39 ocb_state *ocb;
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40
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41 LTC_ARGCHK(key != NULL);
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42 LTC_ARGCHK(nonce != NULL);
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43 LTC_ARGCHK(pt != NULL);
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44 LTC_ARGCHK(ct != NULL);
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45 LTC_ARGCHK(tag != NULL);
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46 LTC_ARGCHK(taglen != NULL);
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47
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48 /* allocate ram */
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49 ocb = XMALLOC(sizeof(ocb_state));
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50 if (ocb == NULL) {
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51 return CRYPT_MEM;
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52 }
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53
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54 if ((err = ocb_init(ocb, cipher, key, keylen, nonce)) != CRYPT_OK) {
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55 goto LBL_ERR;
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56 }
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57
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58 while (ptlen > (unsigned long)ocb->block_len) {
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59 if ((err = ocb_encrypt(ocb, pt, ct)) != CRYPT_OK) {
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60 goto LBL_ERR;
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61 }
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62 ptlen -= ocb->block_len;
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63 pt += ocb->block_len;
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64 ct += ocb->block_len;
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65 }
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66
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67 err = ocb_done_encrypt(ocb, pt, ptlen, ct, tag, taglen);
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68 LBL_ERR:
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69 #ifdef LTC_CLEAN_STACK
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70 zeromem(ocb, sizeof(ocb_state));
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71 #endif
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72
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73 XFREE(ocb);
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74
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75 return err;
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76 }
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77
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78 #endif
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79
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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80 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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81 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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82 /* commit time: $Format:%ai$ */