Mercurial > dropbear
annotate libtomcrypt/src/pk/rsa/rsa_sign_hash.c @ 795:7f604f9b3756 ecc
ecdsa is working
author | Matt Johnston <matt@ucc.asn.au> |
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date | Fri, 03 May 2013 23:07:48 +0800 |
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children | f849a5ca2efc |
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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 * Tom St Denis, [email protected], http://libtomcrypt.com |
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10 */ |
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11 #include "tomcrypt.h" |
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12 |
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13 /** |
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14 @file rsa_sign_hash.c |
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15 RSA PKCS #1 v1.5 and v2 PSS sign hash, Tom St Denis and Andreas Lange |
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16 */ |
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17 |
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18 #ifdef MRSA |
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19 |
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20 /** |
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21 PKCS #1 pad then sign |
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22 @param in The hash to sign |
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23 @param inlen The length of the hash to sign (octets) |
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24 @param out [out] The signature |
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25 @param outlen [in/out] The max size and resulting size of the signature |
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26 @param padding Type of padding (LTC_PKCS_1_PSS or LTC_PKCS_1_V1_5) |
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27 @param prng An active PRNG state |
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28 @param prng_idx The index of the PRNG desired |
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29 @param hash_idx The index of the hash desired |
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30 @param saltlen The length of the salt desired (octets) |
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31 @param key The private RSA key to use |
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32 @return CRYPT_OK if successful |
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33 */ |
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34 int rsa_sign_hash_ex(const unsigned char *in, unsigned long inlen, |
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35 unsigned char *out, unsigned long *outlen, |
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36 int padding, |
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37 prng_state *prng, int prng_idx, |
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38 int hash_idx, unsigned long saltlen, |
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39 rsa_key *key) |
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40 { |
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41 unsigned long modulus_bitlen, modulus_bytelen, x, y; |
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42 int err; |
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43 |
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44 LTC_ARGCHK(in != NULL); |
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45 LTC_ARGCHK(out != NULL); |
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46 LTC_ARGCHK(outlen != NULL); |
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47 LTC_ARGCHK(key != NULL); |
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48 |
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49 /* valid padding? */ |
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50 if ((padding != LTC_PKCS_1_V1_5) && (padding != LTC_PKCS_1_PSS)) { |
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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 and hash ? */ |
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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 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) { |
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60 return err; |
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61 } |
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62 } |
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63 |
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64 /* get modulus len in bits */ |
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65 modulus_bitlen = mp_count_bits((key->N)); |
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66 |
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67 /* outlen must be at least the size of the modulus */ |
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68 modulus_bytelen = mp_unsigned_bin_size((key->N)); |
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69 if (modulus_bytelen > *outlen) { |
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70 *outlen = modulus_bytelen; |
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71 return CRYPT_BUFFER_OVERFLOW; |
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72 } |
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73 |
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74 if (padding == LTC_PKCS_1_PSS) { |
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75 /* PSS pad the key */ |
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76 x = *outlen; |
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77 if ((err = pkcs_1_pss_encode(in, inlen, saltlen, prng, prng_idx, |
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78 hash_idx, modulus_bitlen, out, &x)) != CRYPT_OK) { |
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79 return err; |
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80 } |
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81 } else { |
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82 /* PKCS #1 v1.5 pad the hash */ |
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83 unsigned char *tmpin; |
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84 ltc_asn1_list digestinfo[2], siginfo[2]; |
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85 |
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86 /* not all hashes have OIDs... so sad */ |
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87 if (hash_descriptor[hash_idx].OIDlen == 0) { |
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88 return CRYPT_INVALID_ARG; |
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89 } |
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90 |
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91 /* construct the SEQUENCE |
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92 SEQUENCE { |
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93 SEQUENCE {hashoid OID |
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94 blah NULL |
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95 } |
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96 hash OCTET STRING |
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97 } |
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98 */ |
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99 LTC_SET_ASN1(digestinfo, 0, LTC_ASN1_OBJECT_IDENTIFIER, hash_descriptor[hash_idx].OID, hash_descriptor[hash_idx].OIDlen); |
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100 LTC_SET_ASN1(digestinfo, 1, LTC_ASN1_NULL, NULL, 0); |
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101 LTC_SET_ASN1(siginfo, 0, LTC_ASN1_SEQUENCE, digestinfo, 2); |
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102 LTC_SET_ASN1(siginfo, 1, LTC_ASN1_OCTET_STRING, in, inlen); |
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103 |
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104 /* allocate memory for the encoding */ |
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105 y = mp_unsigned_bin_size(key->N); |
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106 tmpin = XMALLOC(y); |
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107 if (tmpin == NULL) { |
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108 return CRYPT_MEM; |
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109 } |
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110 |
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111 if ((err = der_encode_sequence(siginfo, 2, tmpin, &y)) != CRYPT_OK) { |
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112 XFREE(tmpin); |
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113 return err; |
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114 } |
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115 |
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116 x = *outlen; |
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117 if ((err = pkcs_1_v1_5_encode(tmpin, y, LTC_PKCS_1_EMSA, |
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118 modulus_bitlen, NULL, 0, |
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119 out, &x)) != CRYPT_OK) { |
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120 XFREE(tmpin); |
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121 return err; |
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122 } |
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123 XFREE(tmpin); |
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124 } |
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125 |
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126 /* RSA encode it */ |
382
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127 return ltc_mp.rsa_me(out, x, out, outlen, PK_PRIVATE, key); |
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128 } |
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129 |
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130 #endif /* MRSA */ |
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131 |
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132 /* $Source: /cvs/libtom/libtomcrypt/src/pk/rsa/rsa_sign_hash.c,v $ */ |
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133 /* $Revision: 1.9 $ */ |
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134 /* $Date: 2006/11/09 23:15:39 $ */ |