Mercurial > dropbear

annotate libtomcrypt/src/pk/pkcs1/pkcs_1_v1_5_decode.c @ 1861:2b3a8026a6ce

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Add re-exec for server This allows ASLR to re-randomize the address space for every connection, preventing some vulnerabilities from being exploitable by repeated probing. Overhead (memory and time) is yet to be confirmed. At present this is only enabled on Linux. Other BSD platforms with fexecve() would probably also work though have not been tested.
author Matt Johnston <matt@ucc.asn.au>
date Sun, 30 Jan 2022 10:14:56 +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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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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52 result = CRYPT_OK;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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
1471
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
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
86 if (ps_len < 8)
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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.
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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89 */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
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90 result = CRYPT_INVALID_PACKET;
382
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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: $Format:%ai$ */