Mercurial > dropbear

annotate libtomcrypt/src/encauth/ocb/ocb_decrypt_verify_memory.c @ 1492:bd46cf0e245a

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update some dependencies
author Matt Johnston <matt@ucc.asn.au>
date Wed, 14 Feb 2018 00:17:30 +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
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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_decrypt_verify_memory.c
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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12 OCB implementation, helper to decrypt 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
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f849a5ca2efc update to libtomcrypt 1.17 (with Dropbear changes)
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16 #ifdef LTC_OCB_MODE
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18 /**
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19 Decrypt and compare the tag with OCB.
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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 size of the block cipher)
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24 @param ct The ciphertext
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25 @param ctlen The length of the ciphertext (octets)
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26 @param pt [out] The plaintext
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27 @param tag The tag to compare against
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28 @param taglen The length of the tag (octets)
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29 @param stat [out] The result of the tag comparison (1==valid, 0==invalid)
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30 @return CRYPT_OK if successful regardless of the tag comparison
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31 */
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32 int ocb_decrypt_verify_memory(int cipher,
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33 const unsigned char *key, unsigned long keylen,
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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34 const unsigned char *nonce,
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35 const unsigned char *ct, unsigned long ctlen,
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36 unsigned char *pt,
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37 const unsigned char *tag, unsigned long taglen,
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38 int *stat)
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39 {
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40 int err;
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41 ocb_state *ocb;
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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(stat != NULL);
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49
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50 /* allocate memory */
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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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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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57 goto LBL_ERR;
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58 }
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59
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60 while (ctlen > (unsigned long)ocb->block_len) {
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61 if ((err = ocb_decrypt(ocb, ct, pt)) != CRYPT_OK) {
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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62 goto LBL_ERR;
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63 }
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64 ctlen -= 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_decrypt(ocb, ct, ctlen, pt, tag, taglen, stat);
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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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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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
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81
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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82 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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83 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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84 /* commit time: $Format:%ai$ */