Mercurial > dropbear

annotate libtomcrypt/src/pk/pkcs1/pkcs_1_v1_5_decode.c @ 1857:6022df862942

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Use DSCP for IP QoS traffic classes The previous TOS values are deprecated and not used by modern traffic classifiers. This sets AF21 for "interactive" traffic (with a tty). Non-tty traffic sets AF11 - that indicates high throughput but is not lowest priority (which would be CS1 or LE). This differs from the CS1 used by OpenSSH, it lets interactive git over SSH have higher priority than background least effort traffic. Dropbear's settings here should be suitable with the diffservs used by CAKE qdisc.
author Matt Johnston <matt@ucc.asn.au>
date Tue, 25 Jan 2022 17:32:20 +0800
parents 6dba84798cd5
children
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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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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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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parents: 1435
diff changeset
87 {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
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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diff changeset
89 */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
diff changeset
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: $Format:%ai$ */