Mercurial > dropbear
annotate libtomcrypt/src/encauth/ocb3/ocb3_decrypt_verify_memory.c @ 1869:d7247462fa0d
Fix incorrect algolist TRACE print
author | Matt Johnston <matt@ucc.asn.au> |
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date | Tue, 01 Feb 2022 22:12:25 +0800 |
parents | 6dba84798cd5 |
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rev | line source |
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1471
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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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10 /** |
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11 @file ocb3_decrypt_verify_memory.c |
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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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16 #ifdef LTC_OCB3_MODE |
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17 |
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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 noncelen The length of the nonce (octets) |
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25 @param adata The AAD - additional associated data |
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26 @param adatalen The length of AAD (octets) |
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27 @param ct The ciphertext |
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28 @param ctlen The length of the ciphertext (octets) |
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29 @param pt [out] The plaintext |
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30 @param tag The tag to compare against |
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31 @param taglen The length of the tag (octets) |
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32 @param stat [out] The result of the tag comparison (1==valid, 0==invalid) |
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33 @return CRYPT_OK if successful regardless of the tag comparison |
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34 */ |
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35 int ocb3_decrypt_verify_memory(int cipher, |
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36 const unsigned char *key, unsigned long keylen, |
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37 const unsigned char *nonce, unsigned long noncelen, |
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38 const unsigned char *adata, unsigned long adatalen, |
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39 const unsigned char *ct, unsigned long ctlen, |
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40 unsigned char *pt, |
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41 const unsigned char *tag, unsigned long taglen, |
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42 int *stat) |
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43 { |
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44 int err; |
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45 ocb3_state *ocb; |
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46 unsigned char *buf; |
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47 unsigned long buflen; |
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48 |
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49 LTC_ARGCHK(stat != NULL); |
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50 |
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51 /* default to zero */ |
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52 *stat = 0; |
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53 |
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54 /* limit taglen */ |
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55 taglen = MIN(taglen, MAXBLOCKSIZE); |
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56 |
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57 /* allocate memory */ |
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58 buf = XMALLOC(taglen); |
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59 ocb = XMALLOC(sizeof(ocb3_state)); |
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60 if (ocb == NULL || buf == NULL) { |
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61 if (ocb != NULL) { |
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62 XFREE(ocb); |
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63 } |
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64 if (buf != NULL) { |
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65 XFREE(buf); |
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66 } |
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67 return CRYPT_MEM; |
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68 } |
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69 |
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70 if ((err = ocb3_init(ocb, cipher, key, keylen, nonce, noncelen, taglen)) != CRYPT_OK) { |
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71 goto LBL_ERR; |
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72 } |
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73 |
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74 if (adata != NULL || adatalen != 0) { |
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75 if ((err = ocb3_add_aad(ocb, adata, adatalen)) != CRYPT_OK) { |
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76 goto LBL_ERR; |
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77 } |
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78 } |
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79 |
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80 if ((err = ocb3_decrypt_last(ocb, ct, ctlen, pt)) != CRYPT_OK) { |
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81 goto LBL_ERR; |
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82 } |
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83 |
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84 buflen = taglen; |
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85 if ((err = ocb3_done(ocb, buf, &buflen)) != CRYPT_OK) { |
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86 goto LBL_ERR; |
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87 } |
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88 |
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89 /* compare tags */ |
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90 if (buflen >= taglen && XMEM_NEQ(buf, tag, taglen) == 0) { |
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91 *stat = 1; |
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92 } |
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93 |
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94 err = CRYPT_OK; |
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95 |
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96 LBL_ERR: |
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97 #ifdef LTC_CLEAN_STACK |
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98 zeromem(ocb, sizeof(ocb3_state)); |
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99 #endif |
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100 |
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101 XFREE(ocb); |
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102 XFREE(buf); |
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103 return err; |
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104 } |
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105 |
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106 #endif |
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107 |
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108 /* ref: $Format:%D$ */ |
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109 /* git commit: $Format:%H$ */ |
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110 /* commit time: $Format:%ai$ */ |