Mercurial > dropbear

annotate src/encauth/ocb/ocb_encrypt_authenticate_memory.c @ 199:8be64e2c86f4 libtomcrypt

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* SMALL_CODE is now LTC_SMALL_CODE
author Matt Johnston <matt@ucc.asn.au>
date Tue, 10 May 2005 17:02:59 +0000
parents 1c15b283127b
children 39d5d58461d6
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
191
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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 * Tom St Denis, [email protected], http://libtomcrypt.org
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10 */
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11
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12 /**
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13 @file ocb_encrypt_authenticate_memory.c
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14 OCB implementation, encrypt block of memory, by Tom St Denis
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15 */
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16 #include "tomcrypt.h"
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17
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18 #ifdef OCB_MODE
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19
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20 /**
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21 Encrypt and generate an authentication code for a buffer of memory
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22 @param cipher The index of the cipher desired
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23 @param key The secret key
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24 @param keylen The length of the secret key (octets)
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25 @param nonce The session nonce (length of the block ciphers block size)
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26 @param pt The plaintext
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27 @param ptlen The length of the plaintext (octets)
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28 @param ct [out] The ciphertext
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29 @param tag [out] The authentication tag
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30 @param taglen [in/out] The max size and resulting size of the authentication tag
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31 @return CRYPT_OK if successful
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32 */
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33 int ocb_encrypt_authenticate_memory(int cipher,
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34 const unsigned char *key, unsigned long keylen,
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35 const unsigned char *nonce,
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36 const unsigned char *pt, unsigned long ptlen,
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37 unsigned char *ct,
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38 unsigned char *tag, unsigned long *taglen)
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39 {
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40 int err;
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41 ocb_state *ocb;
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42
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43 LTC_ARGCHK(key != NULL);
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44 LTC_ARGCHK(nonce != NULL);
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45 LTC_ARGCHK(pt != NULL);
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46 LTC_ARGCHK(ct != NULL);
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47 LTC_ARGCHK(tag != NULL);
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48 LTC_ARGCHK(taglen != NULL);
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49
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50 /* allocate ram */
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51 ocb = XMALLOC(sizeof(ocb_state));
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52 if (ocb == NULL) {
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53 return CRYPT_MEM;
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54 }
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55
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56 if ((err = ocb_init(ocb, cipher, key, keylen, nonce)) != CRYPT_OK) {
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57 goto LBL_ERR;
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58 }
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59
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60 while (ptlen > (unsigned long)ocb->block_len) {
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61 if ((err = ocb_encrypt(ocb, pt, ct)) != CRYPT_OK) {
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62 goto LBL_ERR;
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63 }
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64 ptlen -= ocb->block_len;
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65 pt += ocb->block_len;
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66 ct += ocb->block_len;
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67 }
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68
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69 err = ocb_done_encrypt(ocb, pt, ptlen, ct, tag, taglen);
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70 LBL_ERR:
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71 #ifdef LTC_CLEAN_STACK
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72 zeromem(ocb, sizeof(ocb_state));
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73 #endif
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74
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75 XFREE(ocb);
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76
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77 return err;
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78 }
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79
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80 #endif