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comparison libtomcrypt/src/pk/rsa/rsa_sign_hash.c @ 1471:6dba84798cd5

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Update to libtomcrypt 1.18.1, merged with Dropbear changes
author Matt Johnston <matt@ucc.asn.au>
date Fri, 09 Feb 2018 21:44:05 +0800
parents f849a5ca2efc
children
comparison
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1470:8bba51a55704 1471:6dba84798cd5
3 * LibTomCrypt is a library that provides various cryptographic 3 * LibTomCrypt is a library that provides various cryptographic
4 * algorithms in a highly modular and flexible manner. 4 * algorithms in a highly modular and flexible manner.
5 * 5 *
6 * The library is free for all purposes without any express 6 * The library is free for all purposes without any express
7 * guarantee it works. 7 * guarantee it works.
8 *
9 * Tom St Denis, [email protected], http://libtom.org
10 */ 8 */
11 #include "tomcrypt.h" 9 #include "tomcrypt.h"
12 10
13 /** 11 /**
14 @file rsa_sign_hash.c 12 @file rsa_sign_hash.c
15 RSA LTC_PKCS #1 v1.5 and v2 PSS sign hash, Tom St Denis and Andreas Lange 13 RSA PKCS #1 v1.5 and v2 PSS sign hash, Tom St Denis and Andreas Lange
16 */ 14 */
17 15
18 #ifdef LTC_MRSA 16 #ifdef LTC_MRSA
19 17
20 /** 18 /**
21 LTC_PKCS #1 pad then sign 19 PKCS #1 pad then sign
22 @param in The hash to sign 20 @param in The hash to sign
23 @param inlen The length of the hash to sign (octets) 21 @param inlen The length of the hash to sign (octets)
24 @param out [out] The signature 22 @param out [out] The signature
25 @param outlen [in/out] The max size and resulting size of the signature 23 @param outlen [in/out] The max size and resulting size of the signature
26 @param padding Type of padding (LTC_LTC_PKCS_1_PSS or LTC_LTC_PKCS_1_V1_5) 24 @param padding Type of padding (LTC_PKCS_1_PSS, LTC_PKCS_1_V1_5 or LTC_PKCS_1_V1_5_NA1)
27 @param prng An active PRNG state 25 @param prng An active PRNG state
28 @param prng_idx The index of the PRNG desired 26 @param prng_idx The index of the PRNG desired
29 @param hash_idx The index of the hash desired 27 @param hash_idx The index of the hash desired
30 @param saltlen The length of the salt desired (octets) 28 @param saltlen The length of the salt desired (octets)
31 @param key The private RSA key to use 29 @param key The private RSA key to use
45 LTC_ARGCHK(out != NULL); 43 LTC_ARGCHK(out != NULL);
46 LTC_ARGCHK(outlen != NULL); 44 LTC_ARGCHK(outlen != NULL);
47 LTC_ARGCHK(key != NULL); 45 LTC_ARGCHK(key != NULL);
48 46
49 /* valid padding? */ 47 /* valid padding? */
50 if ((padding != LTC_LTC_PKCS_1_V1_5) && (padding != LTC_LTC_PKCS_1_PSS)) { 48 if ((padding != LTC_PKCS_1_V1_5) &&
49 (padding != LTC_PKCS_1_PSS) &&
50 (padding != LTC_PKCS_1_V1_5_NA1)) {
51 return CRYPT_PK_INVALID_PADDING; 51 return CRYPT_PK_INVALID_PADDING;
52 } 52 }
53 53
54 if (padding == LTC_LTC_PKCS_1_PSS) { 54 if (padding == LTC_PKCS_1_PSS) {
55 /* valid prng and hash ? */ 55 /* valid prng ? */
56 if ((err = prng_is_valid(prng_idx)) != CRYPT_OK) { 56 if ((err = prng_is_valid(prng_idx)) != CRYPT_OK) {
57 return err; 57 return err;
58 } 58 }
59 }
60
61 if (padding != LTC_PKCS_1_V1_5_NA1) {
62 /* valid hash ? */
59 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) { 63 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) {
60 return err; 64 return err;
61 } 65 }
62 } 66 }
63 67
69 if (modulus_bytelen > *outlen) { 73 if (modulus_bytelen > *outlen) {
70 *outlen = modulus_bytelen; 74 *outlen = modulus_bytelen;
71 return CRYPT_BUFFER_OVERFLOW; 75 return CRYPT_BUFFER_OVERFLOW;
72 } 76 }
73 77
74 if (padding == LTC_LTC_PKCS_1_PSS) { 78 if (padding == LTC_PKCS_1_PSS) {
75 /* PSS pad the key */ 79 /* PSS pad the key */
76 x = *outlen; 80 x = *outlen;
77 if ((err = pkcs_1_pss_encode(in, inlen, saltlen, prng, prng_idx, 81 if ((err = pkcs_1_pss_encode(in, inlen, saltlen, prng, prng_idx,
78 hash_idx, modulus_bitlen, out, &x)) != CRYPT_OK) { 82 hash_idx, modulus_bitlen, out, &x)) != CRYPT_OK) {
79 return err; 83 return err;
80 } 84 }
81 } else { 85 } else {
82 /* LTC_PKCS #1 v1.5 pad the hash */ 86 /* PKCS #1 v1.5 pad the hash */
83 unsigned char *tmpin; 87 unsigned char *tmpin;
84 ltc_asn1_list digestinfo[2], siginfo[2];
85 88
86 /* not all hashes have OIDs... so sad */ 89 if (padding == LTC_PKCS_1_V1_5) {
87 if (hash_descriptor[hash_idx].OIDlen == 0) { 90 ltc_asn1_list digestinfo[2], siginfo[2];
88 return CRYPT_INVALID_ARG; 91 /* not all hashes have OIDs... so sad */
89 } 92 if (hash_descriptor[hash_idx].OIDlen == 0) {
93 return CRYPT_INVALID_ARG;
94 }
90 95
91 /* construct the SEQUENCE 96 /* construct the SEQUENCE
92 SEQUENCE { 97 SEQUENCE {
93 SEQUENCE {hashoid OID 98 SEQUENCE {hashoid OID
94 blah NULL 99 blah NULL
95 } 100 }
96 hash OCTET STRING 101 hash OCTET STRING
102 }
103 */
104 LTC_SET_ASN1(digestinfo, 0, LTC_ASN1_OBJECT_IDENTIFIER, hash_descriptor[hash_idx].OID, hash_descriptor[hash_idx].OIDlen);
105 LTC_SET_ASN1(digestinfo, 1, LTC_ASN1_NULL, NULL, 0);
106 LTC_SET_ASN1(siginfo, 0, LTC_ASN1_SEQUENCE, digestinfo, 2);
107 LTC_SET_ASN1(siginfo, 1, LTC_ASN1_OCTET_STRING, in, inlen);
108
109 /* allocate memory for the encoding */
110 y = mp_unsigned_bin_size(key->N);
111 tmpin = XMALLOC(y);
112 if (tmpin == NULL) {
113 return CRYPT_MEM;
97 } 114 }
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);
103 115
104 /* allocate memory for the encoding */ 116 if ((err = der_encode_sequence(siginfo, 2, tmpin, &y)) != CRYPT_OK) {
105 y = mp_unsigned_bin_size(key->N); 117 XFREE(tmpin);
106 tmpin = XMALLOC(y); 118 return err;
107 if (tmpin == NULL) { 119 }
108 return CRYPT_MEM; 120 } else {
109 } 121 /* set the pointer and data-length to the input values */
110 122 tmpin = (unsigned char *)in;
111 if ((err = der_encode_sequence(siginfo, 2, tmpin, &y)) != CRYPT_OK) { 123 y = inlen;
112 XFREE(tmpin);
113 return err;
114 } 124 }
115 125
116 x = *outlen; 126 x = *outlen;
117 if ((err = pkcs_1_v1_5_encode(tmpin, y, LTC_LTC_PKCS_1_EMSA, 127 err = pkcs_1_v1_5_encode(tmpin, y, LTC_PKCS_1_EMSA, modulus_bitlen, NULL, 0, out, &x);
118 modulus_bitlen, NULL, 0, 128
119 out, &x)) != CRYPT_OK) { 129 if (padding == LTC_PKCS_1_V1_5) {
120 XFREE(tmpin); 130 XFREE(tmpin);
131 }
132
133 if (err != CRYPT_OK) {
121 return err; 134 return err;
122 } 135 }
123 XFREE(tmpin);
124 } 136 }
125 137
126 /* RSA encode it */ 138 /* RSA encode it */
127 return ltc_mp.rsa_me(out, x, out, outlen, PK_PRIVATE, key); 139 return ltc_mp.rsa_me(out, x, out, outlen, PK_PRIVATE, key);
128 } 140 }
129 141
130 #endif /* LTC_MRSA */ 142 #endif /* LTC_MRSA */
131 143
132 /* $Source$ */ 144 /* ref: $Format:%D$ */
133 /* $Revision$ */ 145 /* git commit: $Format:%H$ */
134 /* $Date$ */ 146 /* commit time: $Format:%ai$ */