Mercurial > dropbear
annotate libtomcrypt/src/pk/pkcs1/pkcs_1_v1_5_decode.c @ 1524:d35cf9a5e0b5
rename default_options.h.in in docs too
author | Matt Johnston <matt@ucc.asn.au> |
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date | Tue, 20 Feb 2018 19:29:55 +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 /** @file pkcs_1_v1_5_decode.c |
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12 * |
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13 * PKCS #1 v1.5 Padding. (Andreas Lange) |
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14 */ |
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15 |
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16 #ifdef LTC_PKCS_1 |
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17 |
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18 /** @brief PKCS #1 v1.5 decode. |
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19 * |
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20 * @param msg The encoded data to decode |
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21 * @param msglen The length of the encoded data (octets) |
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22 * @param block_type Block type to use in padding (\sa ltc_pkcs_1_v1_5_blocks) |
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23 * @param modulus_bitlen The bit length of the RSA modulus |
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24 * @param out [out] Destination of decoding |
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25 * @param outlen [in/out] The max size and resulting size of the decoding |
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26 * @param is_valid [out] Boolean whether the padding was valid |
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27 * |
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28 * @return CRYPT_OK if successful |
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29 */ |
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30 int pkcs_1_v1_5_decode(const unsigned char *msg, |
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31 unsigned long msglen, |
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32 int block_type, |
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33 unsigned long modulus_bitlen, |
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34 unsigned char *out, |
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35 unsigned long *outlen, |
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36 int *is_valid) |
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37 { |
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38 unsigned long modulus_len, ps_len, i; |
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39 int result; |
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40 |
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41 /* default to invalid packet */ |
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42 *is_valid = 0; |
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43 |
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44 modulus_len = (modulus_bitlen >> 3) + (modulus_bitlen & 7 ? 1 : 0); |
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45 |
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46 /* test message size */ |
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47 |
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48 if ((msglen > modulus_len) || (modulus_len < 11)) { |
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49 return CRYPT_PK_INVALID_SIZE; |
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50 } |
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51 |
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52 result = CRYPT_OK; |
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53 |
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54 /* separate encoded message */ |
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55 |
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56 if ((msg[0] != 0x00) || (msg[1] != (unsigned char)block_type)) { |
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57 result = CRYPT_INVALID_PACKET; |
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58 } |
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59 |
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60 if (block_type == LTC_PKCS_1_EME) { |
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61 for (i = 2; i < modulus_len; i++) { |
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62 /* separator */ |
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63 if (msg[i] == 0x00) { break; } |
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64 } |
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65 ps_len = i++ - 2; |
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66 |
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67 if (i >= modulus_len) { |
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68 /* There was no octet with hexadecimal value 0x00 to separate ps from m. |
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69 */ |
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70 result = CRYPT_INVALID_PACKET; |
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71 } |
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72 } else { |
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73 for (i = 2; i < modulus_len - 1; i++) { |
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74 if (msg[i] != 0xFF) { break; } |
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75 } |
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76 |
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77 /* separator check */ |
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78 if (msg[i] != 0) { |
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79 /* There was no octet with hexadecimal value 0x00 to separate ps from m. */ |
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80 result = CRYPT_INVALID_PACKET; |
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81 } |
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82 |
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83 ps_len = i - 2; |
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84 } |
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85 |
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86 if (ps_len < 8) |
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87 { |
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88 /* The length of ps is less than 8 octets. |
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89 */ |
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90 result = CRYPT_INVALID_PACKET; |
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91 } |
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92 |
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93 if (*outlen < (msglen - (2 + ps_len + 1))) { |
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94 result = CRYPT_INVALID_PACKET; |
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95 } |
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96 |
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97 if (result == CRYPT_OK) { |
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98 *outlen = (msglen - (2 + ps_len + 1)); |
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99 XMEMCPY(out, &msg[2 + ps_len + 1], *outlen); |
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100 |
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101 /* valid packet */ |
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102 *is_valid = 1; |
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103 } |
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104 |
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105 return result; |
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106 } /* pkcs_1_v1_5_decode */ |
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108 #endif /* #ifdef LTC_PKCS_1 */ |
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109 |
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110 /* ref: $Format:%D$ */ |
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111 /* git commit: $Format:%H$ */ |
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112 /* commit time: $Format:%ai$ */ |