Mercurial > dropbear

annotate libtomcrypt/src/pk/rsa/rsa_sign_hash.c @ 1537:6a83b1944432

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Fix restricted group code for BSDs, move to separate function
author Matt Johnston <matt@ucc.asn.au>
date Mon, 26 Feb 2018 21:17:13 +0800
parents 6dba84798cd5
children
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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 @file rsa_sign_hash.c
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13 RSA PKCS #1 v1.5 and v2 PSS sign hash, Tom St Denis and Andreas Lange
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14 */
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15
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16 #ifdef LTC_MRSA
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17
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18 /**
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19 PKCS #1 pad then sign
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20 @param in The hash to sign
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21 @param inlen The length of the hash to sign (octets)
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22 @param out [out] The signature
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23 @param outlen [in/out] The max size and resulting size of the signature
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24 @param padding Type of padding (LTC_PKCS_1_PSS, LTC_PKCS_1_V1_5 or LTC_PKCS_1_V1_5_NA1)
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25 @param prng An active PRNG state
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26 @param prng_idx The index of the PRNG desired
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27 @param hash_idx The index of the hash desired
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28 @param saltlen The length of the salt desired (octets)
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29 @param key The private RSA key to use
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30 @return CRYPT_OK if successful
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31 */
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32 int rsa_sign_hash_ex(const unsigned char *in, unsigned long inlen,
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33 unsigned char *out, unsigned long *outlen,
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34 int padding,
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35 prng_state *prng, int prng_idx,
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36 int hash_idx, unsigned long saltlen,
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37 rsa_key *key)
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38 {
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39 unsigned long modulus_bitlen, modulus_bytelen, x, y;
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40 int err;
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41
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42 LTC_ARGCHK(in != NULL);
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43 LTC_ARGCHK(out != NULL);
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44 LTC_ARGCHK(outlen != NULL);
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45 LTC_ARGCHK(key != NULL);
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46
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47 /* valid padding? */
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48 if ((padding != LTC_PKCS_1_V1_5) &&
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49 (padding != LTC_PKCS_1_PSS) &&
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50 (padding != LTC_PKCS_1_V1_5_NA1)) {
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51 return CRYPT_PK_INVALID_PADDING;
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52 }
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53
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54 if (padding == LTC_PKCS_1_PSS) {
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55 /* valid prng ? */
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56 if ((err = prng_is_valid(prng_idx)) != CRYPT_OK) {
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57 return err;
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58 }
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59 }
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60
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61 if (padding != LTC_PKCS_1_V1_5_NA1) {
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62 /* valid hash ? */
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63 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) {
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64 return err;
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65 }
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66 }
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67
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68 /* get modulus len in bits */
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69 modulus_bitlen = mp_count_bits((key->N));
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70
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71 /* outlen must be at least the size of the modulus */
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72 modulus_bytelen = mp_unsigned_bin_size((key->N));
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73 if (modulus_bytelen > *outlen) {
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74 *outlen = modulus_bytelen;
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75 return CRYPT_BUFFER_OVERFLOW;
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76 }
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77
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78 if (padding == LTC_PKCS_1_PSS) {
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79 /* PSS pad the key */
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80 x = *outlen;
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81 if ((err = pkcs_1_pss_encode(in, inlen, saltlen, prng, prng_idx,
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82 hash_idx, modulus_bitlen, out, &x)) != CRYPT_OK) {
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83 return err;
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84 }
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85 } else {
1471
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86 /* PKCS #1 v1.5 pad the hash */
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87 unsigned char *tmpin;
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88
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89 if (padding == LTC_PKCS_1_V1_5) {
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90 ltc_asn1_list digestinfo[2], siginfo[2];
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91 /* not all hashes have OIDs... so sad */
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92 if (hash_descriptor[hash_idx].OIDlen == 0) {
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93 return CRYPT_INVALID_ARG;
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94 }
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95
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96 /* construct the SEQUENCE
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97 SEQUENCE {
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98 SEQUENCE {hashoid OID
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99 blah NULL
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100 }
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101 hash OCTET STRING
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102 }
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103 */
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104 LTC_SET_ASN1(digestinfo, 0, LTC_ASN1_OBJECT_IDENTIFIER, hash_descriptor[hash_idx].OID, hash_descriptor[hash_idx].OIDlen);
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105 LTC_SET_ASN1(digestinfo, 1, LTC_ASN1_NULL, NULL, 0);
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106 LTC_SET_ASN1(siginfo, 0, LTC_ASN1_SEQUENCE, digestinfo, 2);
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107 LTC_SET_ASN1(siginfo, 1, LTC_ASN1_OCTET_STRING, in, inlen);
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108
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109 /* allocate memory for the encoding */
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110 y = mp_unsigned_bin_size(key->N);
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111 tmpin = XMALLOC(y);
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112 if (tmpin == NULL) {
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113 return CRYPT_MEM;
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114 }
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115
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116 if ((err = der_encode_sequence(siginfo, 2, tmpin, &y)) != CRYPT_OK) {
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117 XFREE(tmpin);
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118 return err;
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119 }
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120 } else {
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121 /* set the pointer and data-length to the input values */
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122 tmpin = (unsigned char *)in;
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123 y = inlen;
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124 }
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125
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126 x = *outlen;
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127 err = pkcs_1_v1_5_encode(tmpin, y, LTC_PKCS_1_EMSA, modulus_bitlen, NULL, 0, out, &x);
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128
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129 if (padding == LTC_PKCS_1_V1_5) {
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130 XFREE(tmpin);
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131 }
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132
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133 if (err != CRYPT_OK) {
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134 return err;
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135 }
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136 }
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137
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138 /* RSA encode it */
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139 return ltc_mp.rsa_me(out, x, out, outlen, PK_PRIVATE, key);
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140 }
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141
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142 #endif /* LTC_MRSA */
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143
1471
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144 /* ref: $Format:%D$ */
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145 /* git commit: $Format:%H$ */
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146 /* commit time: $Format:%ai$ */