Mercurial > dropbear
annotate src/pk/rsa/rsa_sign_hash.c @ 390:d8e44bef7917 libtomcrypt-dropbear
Replace // with /* */
| author | Matt Johnston <matt@ucc.asn.au> |
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| date | Thu, 11 Jan 2007 04:28:09 +0000 |
| parents | d5faf4814ddb |
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| rev | line source |
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Re-import libtomcrypt 1.05 for cleaner propagating.
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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 * |
| 380 | 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 |
| 380 | 15 RSA PKCS #1 v1.5 and v2 PSS sign hash, Tom St Denis and Andreas Lange |
| 16 */ | |
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17 |
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18 #ifdef MRSA |
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19 |
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20 /** |
| 380 | 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 |
| 380 | 25 @param outlen [in/out] The max size and resulting size of the signature |
| 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 */ |
| 380 | 34 int rsa_sign_hash_ex(const unsigned char *in, unsigned long inlen, |
| 35 unsigned char *out, unsigned long *outlen, | |
| 36 int padding, | |
| 37 prng_state *prng, int prng_idx, | |
| 38 int hash_idx, unsigned long saltlen, | |
| 39 rsa_key *key) | |
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40 { |
| 380 | 41 unsigned long modulus_bitlen, modulus_bytelen, x, y; |
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42 int err; |
| 380 | 43 |
| 44 LTC_ARGCHK(in != NULL); | |
| 45 LTC_ARGCHK(out != NULL); | |
| 46 LTC_ARGCHK(outlen != NULL); | |
| 47 LTC_ARGCHK(key != NULL); | |
| 48 | |
| 49 /* valid padding? */ | |
| 50 if ((padding != LTC_PKCS_1_V1_5) && (padding != LTC_PKCS_1_PSS)) { | |
| 51 return CRYPT_PK_INVALID_PADDING; | |
| 52 } | |
| 53 | |
| 54 if (padding == LTC_PKCS_1_PSS) { | |
| 55 /* valid prng and hash ? */ | |
| 56 if ((err = prng_is_valid(prng_idx)) != CRYPT_OK) { | |
| 57 return err; | |
| 58 } | |
| 59 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) { | |
| 60 return err; | |
| 61 } | |
| 62 } | |
| 63 | |
| 64 /* get modulus len in bits */ | |
| 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 */ |
| 380 | 68 modulus_bytelen = mp_unsigned_bin_size((key->N)); |
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69 if (modulus_bytelen > *outlen) { |
| 380 | 70 *outlen = modulus_bytelen; |
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71 return CRYPT_BUFFER_OVERFLOW; |
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72 } |
| 380 | 73 |
| 74 if (padding == LTC_PKCS_1_PSS) { | |
| 75 /* PSS pad the key */ | |
| 76 x = *outlen; | |
| 77 if ((err = pkcs_1_pss_encode(in, inlen, saltlen, prng, prng_idx, | |
| 78 hash_idx, modulus_bitlen, out, &x)) != CRYPT_OK) { | |
| 79 return err; | |
| 80 } | |
| 81 } else { | |
| 82 /* PKCS #1 v1.5 pad the hash */ | |
| 83 unsigned char *tmpin; | |
| 84 ltc_asn1_list digestinfo[2], siginfo[2]; | |
| 85 | |
| 86 /* not all hashes have OIDs... so sad */ | |
| 87 if (hash_descriptor[hash_idx].OIDlen == 0) { | |
| 88 return CRYPT_INVALID_ARG; | |
| 89 } | |
| 90 | |
| 91 /* construct the SEQUENCE | |
| 92 SEQUENCE { | |
| 93 SEQUENCE {hashoid OID | |
| 94 blah NULL | |
| 95 } | |
| 96 hash OCTET STRING | |
| 97 } | |
| 98 */ | |
| 99 LTC_SET_ASN1(digestinfo, 0, LTC_ASN1_OBJECT_IDENTIFIER, hash_descriptor[hash_idx].OID, hash_descriptor[hash_idx].OIDlen); | |
| 100 LTC_SET_ASN1(digestinfo, 1, LTC_ASN1_NULL, NULL, 0); | |
| 101 LTC_SET_ASN1(siginfo, 0, LTC_ASN1_SEQUENCE, digestinfo, 2); | |
| 102 LTC_SET_ASN1(siginfo, 1, LTC_ASN1_OCTET_STRING, in, inlen); | |
| 103 | |
| 104 /* allocate memory for the encoding */ | |
| 105 y = mp_unsigned_bin_size(key->N); | |
| 106 tmpin = XMALLOC(y); | |
| 107 if (tmpin == NULL) { | |
| 108 return CRYPT_MEM; | |
| 109 } | |
| 110 | |
| 111 if ((err = der_encode_sequence(siginfo, 2, tmpin, &y)) != CRYPT_OK) { | |
| 112 XFREE(tmpin); | |
| 113 return err; | |
| 114 } | |
| 115 | |
| 116 x = *outlen; | |
| 117 if ((err = pkcs_1_v1_5_encode(tmpin, y, LTC_PKCS_1_EMSA, | |
| 118 modulus_bitlen, NULL, 0, | |
| 119 out, &x)) != CRYPT_OK) { | |
| 120 XFREE(tmpin); | |
| 121 return err; | |
| 122 } | |
| 123 XFREE(tmpin); | |
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124 } |
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125 |
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126 /* RSA encode it */ |
| 380 | 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 $ */ |
| 380 | 133 /* $Revision: 1.9 $ */ |
| 134 /* $Date: 2006/11/09 23:15:39 $ */ |