Mercurial > dropbear
annotate libtomcrypt/src/modes/xts/xts_decrypt.c @ 1804:f0cd000f3bca
Prevent multiple shells being spawned
Existing shells would be leaked.
The old check only caught multiple commands, not shells.
author | Matt Johnston <matt@ucc.asn.au> |
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date | Sat, 06 Mar 2021 23:06:43 +0800 |
parents | 6dba84798cd5 |
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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 #include "tomcrypt.h" |
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10 |
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11 /** |
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12 Source donated by Elliptic Semiconductor Inc (www.ellipticsemi.com) to the LibTom Projects |
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13 */ |
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14 |
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15 #ifdef LTC_XTS_MODE |
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16 |
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17 static int _tweak_uncrypt(const unsigned char *C, unsigned char *P, unsigned char *T, symmetric_xts *xts) |
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18 { |
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19 unsigned long x; |
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20 int err; |
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21 |
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22 /* tweak encrypt block i */ |
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23 #ifdef LTC_FAST |
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24 for (x = 0; x < 16; x += sizeof(LTC_FAST_TYPE)) { |
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25 *(LTC_FAST_TYPE_PTR_CAST(&P[x])) = *(LTC_FAST_TYPE_PTR_CAST(&C[x])) ^ *(LTC_FAST_TYPE_PTR_CAST(&T[x])); |
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26 } |
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27 #else |
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28 for (x = 0; x < 16; x++) { |
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29 P[x] = C[x] ^ T[x]; |
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30 } |
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31 #endif |
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32 |
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33 err = cipher_descriptor[xts->cipher].ecb_decrypt(P, P, &xts->key1); |
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34 |
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35 #ifdef LTC_FAST |
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36 for (x = 0; x < 16; x += sizeof(LTC_FAST_TYPE)) { |
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37 *(LTC_FAST_TYPE_PTR_CAST(&P[x])) ^= *(LTC_FAST_TYPE_PTR_CAST(&T[x])); |
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38 } |
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39 #else |
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40 for (x = 0; x < 16; x++) { |
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41 P[x] = P[x] ^ T[x]; |
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42 } |
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43 #endif |
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44 |
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45 /* LFSR the tweak */ |
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46 xts_mult_x(T); |
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47 |
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48 return err; |
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49 } |
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50 |
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51 /** XTS Decryption |
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52 @param ct [in] Ciphertext |
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53 @param ptlen Length of plaintext (and ciphertext) |
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54 @param pt [out] Plaintext |
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55 @param tweak [in] The 128--bit encryption tweak (e.g. sector number) |
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56 @param xts The XTS structure |
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57 Returns CRYPT_OK upon success |
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58 */ |
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59 int xts_decrypt(const unsigned char *ct, unsigned long ptlen, unsigned char *pt, unsigned char *tweak, |
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60 symmetric_xts *xts) |
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61 { |
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62 unsigned char PP[16], CC[16], T[16]; |
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63 unsigned long i, m, mo, lim; |
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64 int err; |
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65 |
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66 /* check inputs */ |
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67 LTC_ARGCHK(pt != NULL); |
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68 LTC_ARGCHK(ct != NULL); |
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69 LTC_ARGCHK(tweak != NULL); |
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70 LTC_ARGCHK(xts != NULL); |
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71 |
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72 /* check if valid */ |
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73 if ((err = cipher_is_valid(xts->cipher)) != CRYPT_OK) { |
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74 return err; |
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75 } |
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76 |
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77 /* get number of blocks */ |
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78 m = ptlen >> 4; |
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79 mo = ptlen & 15; |
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80 |
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81 /* must have at least one full block */ |
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82 if (m == 0) { |
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83 return CRYPT_INVALID_ARG; |
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84 } |
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85 |
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86 if (mo == 0) { |
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87 lim = m; |
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88 } else { |
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89 lim = m - 1; |
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90 } |
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91 |
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92 if (cipher_descriptor[xts->cipher].accel_xts_decrypt && lim > 0) { |
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93 |
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94 /* use accelerated decryption for whole blocks */ |
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95 if ((err = cipher_descriptor[xts->cipher].accel_xts_decrypt(ct, pt, lim, tweak, &xts->key1, &xts->key2)) != |
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96 CRYPT_OK) { |
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97 return err; |
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98 } |
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99 ct += lim * 16; |
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100 pt += lim * 16; |
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101 |
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102 /* tweak is encrypted on output */ |
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103 XMEMCPY(T, tweak, sizeof(T)); |
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104 } else { |
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105 /* encrypt the tweak */ |
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106 if ((err = cipher_descriptor[xts->cipher].ecb_encrypt(tweak, T, &xts->key2)) != CRYPT_OK) { |
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107 return err; |
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108 } |
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109 |
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110 for (i = 0; i < lim; i++) { |
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111 if ((err = _tweak_uncrypt(ct, pt, T, xts)) != CRYPT_OK) { |
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112 return err; |
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113 } |
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114 ct += 16; |
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115 pt += 16; |
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116 } |
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117 } |
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118 |
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119 /* if ptlen not divide 16 then */ |
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120 if (mo > 0) { |
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121 XMEMCPY(CC, T, 16); |
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122 xts_mult_x(CC); |
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123 |
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124 /* PP = tweak decrypt block m-1 */ |
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125 if ((err = _tweak_uncrypt(ct, PP, CC, xts)) != CRYPT_OK) { |
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126 return err; |
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127 } |
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128 |
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129 /* Pm = first ptlen % 16 bytes of PP */ |
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130 for (i = 0; i < mo; i++) { |
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131 CC[i] = ct[16 + i]; |
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132 pt[16 + i] = PP[i]; |
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133 } |
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134 for (; i < 16; i++) { |
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135 CC[i] = PP[i]; |
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136 } |
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137 |
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138 /* Pm-1 = Tweak uncrypt CC */ |
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139 if ((err = _tweak_uncrypt(CC, pt, T, xts)) != CRYPT_OK) { |
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140 return err; |
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141 } |
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142 } |
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143 |
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144 /* Decrypt the tweak back */ |
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145 if ((err = cipher_descriptor[xts->cipher].ecb_decrypt(T, tweak, &xts->key2)) != CRYPT_OK) { |
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146 return err; |
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147 } |
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148 |
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149 return CRYPT_OK; |
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150 } |
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151 |
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152 #endif |
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153 |
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154 /* ref: $Format:%D$ */ |
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155 /* git commit: $Format:%H$ */ |
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156 /* commit time: $Format:%ai$ */ |