Mercurial > dropbear
annotate libtomcrypt/src/encauth/ocb/ocb_init.c @ 1572:56ec2214144f
no werror for fuzzing clang
author | Matt Johnston <matt@ucc.asn.au> |
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date | Fri, 02 Mar 2018 00:11:27 +0800 |
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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 ocb_init.c |
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12 OCB implementation, initialize state, 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_OCB_MODE |
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17 |
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18 static const struct { |
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19 int len; |
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20 unsigned char poly_div[MAXBLOCKSIZE], |
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21 poly_mul[MAXBLOCKSIZE]; |
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22 } polys[] = { |
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23 { |
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24 8, |
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25 { 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0D }, |
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26 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1B } |
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27 }, { |
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28 16, |
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29 { 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
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30 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x43 }, |
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31 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
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32 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x87 } |
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33 } |
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34 }; |
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35 |
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36 /** |
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37 Initialize an OCB context. |
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38 @param ocb [out] The destination of the OCB state |
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39 @param cipher The index of the desired cipher |
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40 @param key The secret key |
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41 @param keylen The length of the secret key (octets) |
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42 @param nonce The session nonce (length of the block size of the cipher) |
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43 @return CRYPT_OK if successful |
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44 */ |
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45 int ocb_init(ocb_state *ocb, int cipher, |
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46 const unsigned char *key, unsigned long keylen, const unsigned char *nonce) |
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47 { |
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48 int poly, x, y, m, err; |
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49 |
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50 LTC_ARGCHK(ocb != NULL); |
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51 LTC_ARGCHK(key != NULL); |
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52 LTC_ARGCHK(nonce != NULL); |
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53 |
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54 /* valid cipher? */ |
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55 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) { |
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56 return err; |
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57 } |
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58 |
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59 /* determine which polys to use */ |
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60 ocb->block_len = cipher_descriptor[cipher].block_length; |
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61 x = (int)(sizeof(polys)/sizeof(polys[0])); |
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62 for (poly = 0; poly < x; poly++) { |
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63 if (polys[poly].len == ocb->block_len) { |
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64 break; |
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65 } |
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66 } |
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67 if (poly == x) { |
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68 return CRYPT_INVALID_ARG; /* block_len not found in polys */ |
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69 } |
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70 if (polys[poly].len != ocb->block_len) { |
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71 return CRYPT_INVALID_ARG; |
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72 } |
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73 |
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74 /* schedule the key */ |
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75 if ((err = cipher_descriptor[cipher].setup(key, keylen, 0, &ocb->key)) != CRYPT_OK) { |
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76 return err; |
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77 } |
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78 |
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79 /* find L = E[0] */ |
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80 zeromem(ocb->L, ocb->block_len); |
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81 if ((err = cipher_descriptor[cipher].ecb_encrypt(ocb->L, ocb->L, &ocb->key)) != CRYPT_OK) { |
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82 return err; |
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83 } |
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84 |
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85 /* find R = E[N xor L] */ |
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86 for (x = 0; x < ocb->block_len; x++) { |
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87 ocb->R[x] = ocb->L[x] ^ nonce[x]; |
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88 } |
382
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89 if ((err = cipher_descriptor[cipher].ecb_encrypt(ocb->R, ocb->R, &ocb->key)) != CRYPT_OK) { |
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90 return err; |
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91 } |
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92 |
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93 /* find Ls[i] = L << i for i == 0..31 */ |
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94 XMEMCPY(ocb->Ls[0], ocb->L, ocb->block_len); |
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95 for (x = 1; x < 32; x++) { |
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96 m = ocb->Ls[x-1][0] >> 7; |
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97 for (y = 0; y < ocb->block_len-1; y++) { |
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98 ocb->Ls[x][y] = ((ocb->Ls[x-1][y] << 1) | (ocb->Ls[x-1][y+1] >> 7)) & 255; |
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99 } |
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100 ocb->Ls[x][ocb->block_len-1] = (ocb->Ls[x-1][ocb->block_len-1] << 1) & 255; |
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101 |
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102 if (m == 1) { |
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103 for (y = 0; y < ocb->block_len; y++) { |
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104 ocb->Ls[x][y] ^= polys[poly].poly_mul[y]; |
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105 } |
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106 } |
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107 } |
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108 |
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109 /* find Lr = L / x */ |
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110 m = ocb->L[ocb->block_len-1] & 1; |
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111 |
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112 /* shift right */ |
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113 for (x = ocb->block_len - 1; x > 0; x--) { |
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114 ocb->Lr[x] = ((ocb->L[x] >> 1) | (ocb->L[x-1] << 7)) & 255; |
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115 } |
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116 ocb->Lr[0] = ocb->L[0] >> 1; |
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117 |
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118 if (m == 1) { |
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119 for (x = 0; x < ocb->block_len; x++) { |
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120 ocb->Lr[x] ^= polys[poly].poly_div[x]; |
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121 } |
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122 } |
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123 |
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124 /* set Li, checksum */ |
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125 zeromem(ocb->Li, ocb->block_len); |
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126 zeromem(ocb->checksum, ocb->block_len); |
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127 |
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128 /* set other params */ |
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129 ocb->block_index = 1; |
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130 ocb->cipher = cipher; |
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131 |
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132 return CRYPT_OK; |
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133 } |
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134 |
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135 #endif |
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136 |
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137 /* ref: $Format:%D$ */ |
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138 /* git commit: $Format:%H$ */ |
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139 /* commit time: $Format:%ai$ */ |