1 // Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // https://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 #include <openssl/evp.h>
16
17 #include <openssl/bn.h>
18 #include <openssl/bytestring.h>
19 #include <openssl/digest.h>
20 #include <openssl/err.h>
21 #include <openssl/mem.h>
22 #include <openssl/rsa.h>
23
24 #include "../fipsmodule/rsa/internal.h"
25 #include "internal.h"
26
27
rsa_pub_encode(CBB * out,const EVP_PKEY * key)28 static int rsa_pub_encode(CBB *out, const EVP_PKEY *key) {
29 // See RFC 3279, section 2.3.1.
30 const RSA *rsa = reinterpret_cast<const RSA *>(key->pkey);
31 CBB spki, algorithm, null, key_bitstring;
32 if (!CBB_add_asn1(out, &spki, CBS_ASN1_SEQUENCE) ||
33 !CBB_add_asn1(&spki, &algorithm, CBS_ASN1_SEQUENCE) ||
34 !CBB_add_asn1_element(&algorithm, CBS_ASN1_OBJECT, rsa_asn1_meth.oid,
35 rsa_asn1_meth.oid_len) ||
36 !CBB_add_asn1(&algorithm, &null, CBS_ASN1_NULL) ||
37 !CBB_add_asn1(&spki, &key_bitstring, CBS_ASN1_BITSTRING) ||
38 !CBB_add_u8(&key_bitstring, 0 /* padding */) ||
39 !RSA_marshal_public_key(&key_bitstring, rsa) || //
40 !CBB_flush(out)) {
41 OPENSSL_PUT_ERROR(EVP, EVP_R_ENCODE_ERROR);
42 return 0;
43 }
44
45 return 1;
46 }
47
rsa_pub_decode(EVP_PKEY * out,CBS * params,CBS * key)48 static int rsa_pub_decode(EVP_PKEY *out, CBS *params, CBS *key) {
49 // See RFC 3279, section 2.3.1.
50
51 // The parameters must be NULL.
52 CBS null;
53 if (!CBS_get_asn1(params, &null, CBS_ASN1_NULL) || CBS_len(&null) != 0 ||
54 CBS_len(params) != 0) {
55 OPENSSL_PUT_ERROR(EVP, EVP_R_DECODE_ERROR);
56 return 0;
57 }
58
59 RSA *rsa = RSA_parse_public_key(key);
60 if (rsa == NULL || CBS_len(key) != 0) {
61 OPENSSL_PUT_ERROR(EVP, EVP_R_DECODE_ERROR);
62 RSA_free(rsa);
63 return 0;
64 }
65
66 EVP_PKEY_assign_RSA(out, rsa);
67 return 1;
68 }
69
rsa_pub_cmp(const EVP_PKEY * a,const EVP_PKEY * b)70 static int rsa_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b) {
71 const RSA *a_rsa = reinterpret_cast<const RSA *>(a->pkey);
72 const RSA *b_rsa = reinterpret_cast<const RSA *>(b->pkey);
73 return BN_cmp(RSA_get0_n(b_rsa), RSA_get0_n(a_rsa)) == 0 &&
74 BN_cmp(RSA_get0_e(b_rsa), RSA_get0_e(a_rsa)) == 0;
75 }
76
rsa_priv_encode(CBB * out,const EVP_PKEY * key)77 static int rsa_priv_encode(CBB *out, const EVP_PKEY *key) {
78 const RSA *rsa = reinterpret_cast<const RSA *>(key->pkey);
79 CBB pkcs8, algorithm, null, private_key;
80 if (!CBB_add_asn1(out, &pkcs8, CBS_ASN1_SEQUENCE) ||
81 !CBB_add_asn1_uint64(&pkcs8, 0 /* version */) ||
82 !CBB_add_asn1(&pkcs8, &algorithm, CBS_ASN1_SEQUENCE) ||
83 !CBB_add_asn1_element(&algorithm, CBS_ASN1_OBJECT, rsa_asn1_meth.oid,
84 rsa_asn1_meth.oid_len) ||
85 !CBB_add_asn1(&algorithm, &null, CBS_ASN1_NULL) ||
86 !CBB_add_asn1(&pkcs8, &private_key, CBS_ASN1_OCTETSTRING) ||
87 !RSA_marshal_private_key(&private_key, rsa) || //
88 !CBB_flush(out)) {
89 OPENSSL_PUT_ERROR(EVP, EVP_R_ENCODE_ERROR);
90 return 0;
91 }
92
93 return 1;
94 }
95
rsa_priv_decode(EVP_PKEY * out,CBS * params,CBS * key)96 static int rsa_priv_decode(EVP_PKEY *out, CBS *params, CBS *key) {
97 // Per RFC 3447, A.1, the parameters have type NULL.
98 CBS null;
99 if (!CBS_get_asn1(params, &null, CBS_ASN1_NULL) || CBS_len(&null) != 0 ||
100 CBS_len(params) != 0) {
101 OPENSSL_PUT_ERROR(EVP, EVP_R_DECODE_ERROR);
102 return 0;
103 }
104
105 RSA *rsa = RSA_parse_private_key(key);
106 if (rsa == NULL || CBS_len(key) != 0) {
107 OPENSSL_PUT_ERROR(EVP, EVP_R_DECODE_ERROR);
108 RSA_free(rsa);
109 return 0;
110 }
111
112 EVP_PKEY_assign_RSA(out, rsa);
113 return 1;
114 }
115
rsa_opaque(const EVP_PKEY * pkey)116 static int rsa_opaque(const EVP_PKEY *pkey) {
117 const RSA *rsa = reinterpret_cast<const RSA *>(pkey->pkey);
118 return RSA_is_opaque(rsa);
119 }
120
int_rsa_size(const EVP_PKEY * pkey)121 static int int_rsa_size(const EVP_PKEY *pkey) {
122 const RSA *rsa = reinterpret_cast<const RSA *>(pkey->pkey);
123 return RSA_size(rsa);
124 }
125
rsa_bits(const EVP_PKEY * pkey)126 static int rsa_bits(const EVP_PKEY *pkey) {
127 const RSA *rsa = reinterpret_cast<const RSA *>(pkey->pkey);
128 return RSA_bits(rsa);
129 }
130
int_rsa_free(EVP_PKEY * pkey)131 static void int_rsa_free(EVP_PKEY *pkey) {
132 RSA_free(reinterpret_cast<RSA *>(pkey->pkey));
133 pkey->pkey = NULL;
134 }
135
136 const EVP_PKEY_ASN1_METHOD rsa_asn1_meth = {
137 EVP_PKEY_RSA,
138 // 1.2.840.113549.1.1.1
139 {0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x01, 0x01},
140 9,
141
142 &rsa_pkey_meth,
143
144 rsa_pub_decode,
145 rsa_pub_encode,
146 rsa_pub_cmp,
147
148 rsa_priv_decode,
149 rsa_priv_encode,
150
151 /*set_priv_raw=*/NULL,
152 /*set_pub_raw=*/NULL,
153 /*get_priv_raw=*/NULL,
154 /*get_pub_raw=*/NULL,
155 /*set1_tls_encodedpoint=*/NULL,
156 /*get1_tls_encodedpoint=*/NULL,
157
158 rsa_opaque,
159
160 int_rsa_size,
161 rsa_bits,
162
163 0,
164 0,
165 0,
166
167 int_rsa_free,
168 };
169
EVP_PKEY_set1_RSA(EVP_PKEY * pkey,RSA * key)170 int EVP_PKEY_set1_RSA(EVP_PKEY *pkey, RSA *key) {
171 if (EVP_PKEY_assign_RSA(pkey, key)) {
172 RSA_up_ref(key);
173 return 1;
174 }
175 return 0;
176 }
177
EVP_PKEY_assign_RSA(EVP_PKEY * pkey,RSA * key)178 int EVP_PKEY_assign_RSA(EVP_PKEY *pkey, RSA *key) {
179 evp_pkey_set_method(pkey, &rsa_asn1_meth);
180 pkey->pkey = key;
181 return key != NULL;
182 }
183
EVP_PKEY_get0_RSA(const EVP_PKEY * pkey)184 RSA *EVP_PKEY_get0_RSA(const EVP_PKEY *pkey) {
185 if (EVP_PKEY_id(pkey) != EVP_PKEY_RSA) {
186 OPENSSL_PUT_ERROR(EVP, EVP_R_EXPECTING_AN_RSA_KEY);
187 return NULL;
188 }
189 return reinterpret_cast<RSA *>(pkey->pkey);
190 }
191
EVP_PKEY_get1_RSA(const EVP_PKEY * pkey)192 RSA *EVP_PKEY_get1_RSA(const EVP_PKEY *pkey) {
193 RSA *rsa = EVP_PKEY_get0_RSA(pkey);
194 if (rsa != NULL) {
195 RSA_up_ref(rsa);
196 }
197 return rsa;
198 }
199