Mercurial > dropbear
annotate libtomcrypt/src/encauth/ocb/s_ocb_done.c @ 600:a86044b99989
-lcrypt needs to be before object files when static linking
author | Matt Johnston <matt@ucc.asn.au> |
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date | Fri, 25 Feb 2011 12:14:33 +0000 |
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 * |
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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 s_ocb_done.c |
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14 OCB implementation, internal helper, 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 /* Since the last block is encrypted in CTR mode the same code can |
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21 * be used to finish a decrypt or encrypt stream. The only difference |
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22 * is we XOR the final ciphertext into the checksum so we have to xor it |
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23 * before we CTR [decrypt] or after [encrypt] |
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24 * |
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25 * the names pt/ptlen/ct really just mean in/inlen/out but this is the way I wrote it... |
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26 */ |
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27 |
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28 /** |
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29 Shared code to finish an OCB stream |
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30 @param ocb The OCB state |
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31 @param pt The remaining plaintext [or input] |
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32 @param ptlen The length of the input (octets) |
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33 @param ct [out] The output buffer |
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34 @param tag [out] The destination for the authentication tag |
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35 @param taglen [in/out] The max size and resulting size of the authentication tag |
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36 @param mode The mode we are terminating, 0==encrypt, 1==decrypt |
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37 @return CRYPT_OK if successful |
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38 */ |
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39 int s_ocb_done(ocb_state *ocb, const unsigned char *pt, unsigned long ptlen, |
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40 unsigned char *ct, unsigned char *tag, unsigned long *taglen, int mode) |
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41 |
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42 { |
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43 unsigned char *Z, *Y, *X; |
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44 int err, x; |
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45 |
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46 LTC_ARGCHK(ocb != NULL); |
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47 LTC_ARGCHK(pt != NULL); |
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48 LTC_ARGCHK(ct != NULL); |
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49 LTC_ARGCHK(tag != NULL); |
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50 LTC_ARGCHK(taglen != NULL); |
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51 if ((err = cipher_is_valid(ocb->cipher)) != CRYPT_OK) { |
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52 return err; |
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53 } |
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54 if (ocb->block_len != cipher_descriptor[ocb->cipher].block_length || |
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55 (int)ptlen > ocb->block_len || (int)ptlen < 0) { |
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56 return CRYPT_INVALID_ARG; |
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57 } |
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58 |
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59 /* allocate ram */ |
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60 Z = XMALLOC(MAXBLOCKSIZE); |
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61 Y = XMALLOC(MAXBLOCKSIZE); |
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62 X = XMALLOC(MAXBLOCKSIZE); |
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63 if (X == NULL || Y == NULL || Z == NULL) { |
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64 if (X != NULL) { |
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65 XFREE(X); |
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66 } |
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67 if (Y != NULL) { |
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68 XFREE(Y); |
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69 } |
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70 if (Z != NULL) { |
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71 XFREE(Z); |
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72 } |
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73 return CRYPT_MEM; |
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74 } |
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75 |
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76 /* compute X[m] = len(pt[m]) XOR Lr XOR Z[m] */ |
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77 ocb_shift_xor(ocb, X); |
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78 XMEMCPY(Z, X, ocb->block_len); |
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79 |
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80 X[ocb->block_len-1] ^= (ptlen*8)&255; |
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81 X[ocb->block_len-2] ^= ((ptlen*8)>>8)&255; |
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82 for (x = 0; x < ocb->block_len; x++) { |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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83 X[x] ^= ocb->Lr[x]; |
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Matt Johnston <matt@ucc.asn.au>
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84 } |
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85 |
1b9e69c058d2
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86 /* Y[m] = E(X[m])) */ |
382
0cbe8f6dbf9e
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285
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87 if ((err = cipher_descriptor[ocb->cipher].ecb_encrypt(X, Y, &ocb->key)) != CRYPT_OK) { |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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88 goto error; |
0cbe8f6dbf9e
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285
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89 } |
285
1b9e69c058d2
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parents:
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90 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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91 if (mode == 1) { |
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92 /* decrypt mode, so let's xor it first */ |
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Matt Johnston <matt@ucc.asn.au>
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93 /* xor C[m] into checksum */ |
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Matt Johnston <matt@ucc.asn.au>
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94 for (x = 0; x < (int)ptlen; x++) { |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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95 ocb->checksum[x] ^= ct[x]; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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96 } |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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97 } |
1b9e69c058d2
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98 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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99 /* C[m] = P[m] xor Y[m] */ |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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100 for (x = 0; x < (int)ptlen; x++) { |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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101 ct[x] = pt[x] ^ Y[x]; |
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Matt Johnston <matt@ucc.asn.au>
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102 } |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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103 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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104 if (mode == 0) { |
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105 /* encrypt mode */ |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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106 /* xor C[m] into checksum */ |
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Matt Johnston <matt@ucc.asn.au>
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107 for (x = 0; x < (int)ptlen; x++) { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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108 ocb->checksum[x] ^= ct[x]; |
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propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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109 } |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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110 } |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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111 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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112 /* xor Y[m] and Z[m] into checksum */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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113 for (x = 0; x < ocb->block_len; x++) { |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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114 ocb->checksum[x] ^= Y[x] ^ Z[x]; |
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Matt Johnston <matt@ucc.asn.au>
parents:
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115 } |
1b9e69c058d2
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116 |
1b9e69c058d2
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117 /* encrypt checksum, er... tag!! */ |
382
0cbe8f6dbf9e
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118 if ((err = cipher_descriptor[ocb->cipher].ecb_encrypt(ocb->checksum, X, &ocb->key)) != CRYPT_OK) { |
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propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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119 goto error; |
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120 } |
285
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121 cipher_descriptor[ocb->cipher].done(&ocb->key); |
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122 |
1b9e69c058d2
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123 /* now store it */ |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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124 for (x = 0; x < ocb->block_len && x < (int)*taglen; x++) { |
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Matt Johnston <matt@ucc.asn.au>
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125 tag[x] = X[x]; |
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126 } |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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127 *taglen = x; |
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128 |
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129 #ifdef LTC_CLEAN_STACK |
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130 zeromem(X, MAXBLOCKSIZE); |
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131 zeromem(Y, MAXBLOCKSIZE); |
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132 zeromem(Z, MAXBLOCKSIZE); |
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133 zeromem(ocb, sizeof(*ocb)); |
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Matt Johnston <matt@ucc.asn.au>
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134 #endif |
382
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
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285
diff
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|
135 error: |
285
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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|
136 XFREE(X); |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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|
137 XFREE(Y); |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
138 XFREE(Z); |
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139 |
382
0cbe8f6dbf9e
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285
diff
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|
140 return err; |
285
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
141 } |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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|
142 |
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
143 #endif |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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|
144 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
145 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
146 /* $Source: /cvs/libtom/libtomcrypt/src/encauth/ocb/s_ocb_done.c,v $ */ |
382
0cbe8f6dbf9e
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285
diff
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|
147 /* $Revision: 1.6 $ */ |
0cbe8f6dbf9e
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|
148 /* $Date: 2006/03/31 14:15:35 $ */ |