Mercurial > dropbear
annotate libtomcrypt/src/encauth/eax/eax_decrypt_verify_memory.c @ 657:16af1decaf4c
- Merge
author | Matt Johnston <matt@ucc.asn.au> |
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date | Tue, 21 Feb 2012 23:00:30 +0800 |
parents | 0cbe8f6dbf9e |
children | f849a5ca2efc |
rev | line source |
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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 * |
382
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9 * Tom St Denis, [email protected], http://libtomcrypt.com |
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10 */ |
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11 |
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12 /** |
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13 @file eax_decrypt_verify_memory.c |
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14 EAX implementation, decrypt 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 EAX_MODE |
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19 |
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20 /** |
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21 Decrypt a block of memory and verify the provided MAC tag with EAX |
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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 key (octets) |
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25 @param nonce The nonce data (use once) for the session |
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26 @param noncelen The length of the nonce data. |
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27 @param header The session header data |
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28 @param headerlen The length of the header (octets) |
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29 @param ct The ciphertext |
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30 @param ctlen The length of the ciphertext (octets) |
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31 @param pt [out] The plaintext |
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32 @param tag The authentication tag provided by the encoder |
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33 @param taglen [in/out] The length of the tag (octets) |
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34 @param stat [out] The result of the decryption (1==valid tag, 0==invalid) |
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35 @return CRYPT_OK if successful regardless of the resulting tag comparison |
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36 */ |
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37 int eax_decrypt_verify_memory(int cipher, |
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38 const unsigned char *key, unsigned long keylen, |
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39 const unsigned char *nonce, unsigned long noncelen, |
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40 const unsigned char *header, unsigned long headerlen, |
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41 const unsigned char *ct, unsigned long ctlen, |
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42 unsigned char *pt, |
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43 unsigned char *tag, unsigned long taglen, |
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44 int *stat) |
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45 { |
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46 int err; |
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47 eax_state *eax; |
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48 unsigned char *buf; |
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49 unsigned long buflen; |
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50 |
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51 LTC_ARGCHK(stat != NULL); |
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52 LTC_ARGCHK(key != NULL); |
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53 LTC_ARGCHK(pt != NULL); |
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54 LTC_ARGCHK(ct != NULL); |
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55 LTC_ARGCHK(tag != NULL); |
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56 |
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57 /* default to zero */ |
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58 *stat = 0; |
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59 |
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60 /* allocate ram */ |
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61 buf = XMALLOC(taglen); |
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62 eax = XMALLOC(sizeof(*eax)); |
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63 if (eax == NULL || buf == NULL) { |
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64 if (eax != NULL) { |
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65 XFREE(eax); |
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66 } |
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67 if (buf != NULL) { |
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68 XFREE(buf); |
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69 } |
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70 return CRYPT_MEM; |
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71 } |
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72 |
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73 if ((err = eax_init(eax, cipher, key, keylen, nonce, noncelen, header, headerlen)) != CRYPT_OK) { |
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74 goto LBL_ERR; |
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75 } |
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76 |
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77 if ((err = eax_decrypt(eax, ct, pt, ctlen)) != CRYPT_OK) { |
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78 goto LBL_ERR; |
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79 } |
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80 |
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81 buflen = taglen; |
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82 if ((err = eax_done(eax, buf, &buflen)) != CRYPT_OK) { |
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83 goto LBL_ERR; |
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84 } |
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85 |
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86 /* compare tags */ |
382
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87 if (buflen >= taglen && XMEMCMP(buf, tag, taglen) == 0) { |
285
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88 *stat = 1; |
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89 } |
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90 |
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91 err = CRYPT_OK; |
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92 LBL_ERR: |
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93 #ifdef LTC_CLEAN_STACK |
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94 zeromem(buf, taglen); |
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95 zeromem(eax, sizeof(*eax)); |
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96 #endif |
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97 |
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98 XFREE(eax); |
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99 XFREE(buf); |
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100 |
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101 return err; |
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102 } |
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103 |
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104 #endif |
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105 |
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106 /* $Source: /cvs/libtom/libtomcrypt/src/encauth/eax/eax_decrypt_verify_memory.c,v $ */ |
382
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107 /* $Revision: 1.5 $ */ |
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108 /* $Date: 2006/11/01 09:28:17 $ */ |