Mercurial > dropbear
annotate libtomcrypt/src/encauth/ocb/ocb_init.c @ 821:f8b28a3de6cb
Don't say "SSH 2" any more since protocol version 1 is irrelevant
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 03 Oct 2013 23:50:04 +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 * |
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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 ocb_init.c |
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14 OCB implementation, initialize state, 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 static const struct { |
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21 int len; |
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22 unsigned char poly_div[MAXBLOCKSIZE], |
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23 poly_mul[MAXBLOCKSIZE]; |
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24 } polys[] = { |
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25 { |
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26 8, |
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27 { 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0D }, |
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28 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1B } |
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29 }, { |
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30 16, |
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31 { 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
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32 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x43 }, |
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33 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
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34 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x87 } |
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35 } |
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36 }; |
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37 |
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38 /** |
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39 Initialize an OCB context. |
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40 @param ocb [out] The destination of the OCB state |
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41 @param cipher The index of the desired cipher |
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42 @param key The secret key |
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43 @param keylen The length of the secret key (octets) |
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44 @param nonce The session nonce (length of the block size of the cipher) |
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45 @return CRYPT_OK if successful |
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46 */ |
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47 int ocb_init(ocb_state *ocb, int cipher, |
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48 const unsigned char *key, unsigned long keylen, const unsigned char *nonce) |
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49 { |
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50 int poly, x, y, m, err; |
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51 |
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52 LTC_ARGCHK(ocb != NULL); |
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53 LTC_ARGCHK(key != NULL); |
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54 LTC_ARGCHK(nonce != NULL); |
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55 |
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56 /* valid cipher? */ |
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57 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) { |
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58 return err; |
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59 } |
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60 |
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61 /* determine which polys to use */ |
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62 ocb->block_len = cipher_descriptor[cipher].block_length; |
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63 for (poly = 0; poly < (int)(sizeof(polys)/sizeof(polys[0])); poly++) { |
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64 if (polys[poly].len == ocb->block_len) { |
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65 break; |
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66 } |
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67 } |
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68 if (polys[poly].len != ocb->block_len) { |
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69 return CRYPT_INVALID_ARG; |
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70 } |
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71 |
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72 /* schedule the key */ |
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73 if ((err = cipher_descriptor[cipher].setup(key, keylen, 0, &ocb->key)) != CRYPT_OK) { |
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74 return err; |
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75 } |
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76 |
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77 /* find L = E[0] */ |
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78 zeromem(ocb->L, ocb->block_len); |
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79 if ((err = cipher_descriptor[cipher].ecb_encrypt(ocb->L, ocb->L, &ocb->key)) != CRYPT_OK) { |
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80 return err; |
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81 } |
285
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82 |
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83 /* find R = E[N xor L] */ |
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84 for (x = 0; x < ocb->block_len; x++) { |
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85 ocb->R[x] = ocb->L[x] ^ nonce[x]; |
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86 } |
382
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87 if ((err = cipher_descriptor[cipher].ecb_encrypt(ocb->R, ocb->R, &ocb->key)) != CRYPT_OK) { |
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88 return err; |
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89 } |
285
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90 |
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91 /* find Ls[i] = L << i for i == 0..31 */ |
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92 XMEMCPY(ocb->Ls[0], ocb->L, ocb->block_len); |
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93 for (x = 1; x < 32; x++) { |
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94 m = ocb->Ls[x-1][0] >> 7; |
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95 for (y = 0; y < ocb->block_len-1; y++) { |
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96 ocb->Ls[x][y] = ((ocb->Ls[x-1][y] << 1) | (ocb->Ls[x-1][y+1] >> 7)) & 255; |
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97 } |
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98 ocb->Ls[x][ocb->block_len-1] = (ocb->Ls[x-1][ocb->block_len-1] << 1) & 255; |
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99 |
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100 if (m == 1) { |
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101 for (y = 0; y < ocb->block_len; y++) { |
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102 ocb->Ls[x][y] ^= polys[poly].poly_mul[y]; |
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103 } |
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104 } |
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105 } |
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106 |
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107 /* find Lr = L / x */ |
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108 m = ocb->L[ocb->block_len-1] & 1; |
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109 |
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110 /* shift right */ |
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111 for (x = ocb->block_len - 1; x > 0; x--) { |
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112 ocb->Lr[x] = ((ocb->L[x] >> 1) | (ocb->L[x-1] << 7)) & 255; |
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113 } |
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114 ocb->Lr[0] = ocb->L[0] >> 1; |
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115 |
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116 if (m == 1) { |
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117 for (x = 0; x < ocb->block_len; x++) { |
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118 ocb->Lr[x] ^= polys[poly].poly_div[x]; |
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119 } |
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120 } |
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121 |
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122 /* set Li, checksum */ |
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123 zeromem(ocb->Li, ocb->block_len); |
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124 zeromem(ocb->checksum, ocb->block_len); |
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125 |
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126 /* set other params */ |
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127 ocb->block_index = 1; |
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128 ocb->cipher = cipher; |
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129 |
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130 return CRYPT_OK; |
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131 } |
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132 |
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133 #endif |
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134 |
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135 /* $Source: /cvs/libtom/libtomcrypt/src/encauth/ocb/ocb_init.c,v $ */ |
382
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136 /* $Revision: 1.5 $ */ |
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137 /* $Date: 2006/03/31 14:15:35 $ */ |