Mercurial > dropbear

annotate libtomcrypt/src/pk/pkcs1/pkcs_1_v1_5_decode.c @ 1664:871484eac157

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merge
author Matt Johnston <matt@ucc.asn.au>
date Sat, 14 Mar 2020 23:33:30 +0800
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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 #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
382
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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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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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86 if (ps_len < 8)
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87 {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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88 /* The length of ps is less than 8 octets.
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89 */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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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107
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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: $Format:%ai$ */