1 /**
2 * \file pkcs11.c
3 *
4 * \brief Wrapper for PKCS#11 library libpkcs11-helper
5 *
6 * \author Adriaan de Jong <dejong@fox-it.com>
7 *
8 * Copyright The Mbed TLS Contributors
9 * SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
10 */
11
12 #include "mbedtls/pkcs11.h"
13
14 #if defined(MBEDTLS_PKCS11_C)
15
16 #include "mbedtls/md.h"
17 #include "mbedtls/oid.h"
18 #include "mbedtls/x509_crt.h"
19
20 #include "mbedtls/platform.h"
21
22 #include <string.h>
23
mbedtls_pkcs11_init(mbedtls_pkcs11_context * ctx)24 void mbedtls_pkcs11_init(mbedtls_pkcs11_context *ctx)
25 {
26 memset(ctx, 0, sizeof(mbedtls_pkcs11_context));
27 }
28
mbedtls_pkcs11_x509_cert_bind(mbedtls_x509_crt * cert,pkcs11h_certificate_t pkcs11_cert)29 int mbedtls_pkcs11_x509_cert_bind(mbedtls_x509_crt *cert, pkcs11h_certificate_t pkcs11_cert)
30 {
31 int ret = 1;
32 unsigned char *cert_blob = NULL;
33 size_t cert_blob_size = 0;
34
35 if (cert == NULL) {
36 ret = 2;
37 goto cleanup;
38 }
39
40 if (pkcs11h_certificate_getCertificateBlob(pkcs11_cert, NULL,
41 &cert_blob_size) != CKR_OK) {
42 ret = 3;
43 goto cleanup;
44 }
45
46 cert_blob = mbedtls_calloc(1, cert_blob_size);
47 if (NULL == cert_blob) {
48 ret = 4;
49 goto cleanup;
50 }
51
52 if (pkcs11h_certificate_getCertificateBlob(pkcs11_cert, cert_blob,
53 &cert_blob_size) != CKR_OK) {
54 ret = 5;
55 goto cleanup;
56 }
57
58 if (0 != mbedtls_x509_crt_parse(cert, cert_blob, cert_blob_size)) {
59 ret = 6;
60 goto cleanup;
61 }
62
63 ret = 0;
64
65 cleanup:
66 if (NULL != cert_blob) {
67 mbedtls_free(cert_blob);
68 }
69
70 return ret;
71 }
72
73
mbedtls_pkcs11_priv_key_bind(mbedtls_pkcs11_context * priv_key,pkcs11h_certificate_t pkcs11_cert)74 int mbedtls_pkcs11_priv_key_bind(mbedtls_pkcs11_context *priv_key,
75 pkcs11h_certificate_t pkcs11_cert)
76 {
77 int ret = 1;
78 mbedtls_x509_crt cert;
79
80 mbedtls_x509_crt_init(&cert);
81
82 if (priv_key == NULL) {
83 goto cleanup;
84 }
85
86 if (0 != mbedtls_pkcs11_x509_cert_bind(&cert, pkcs11_cert)) {
87 goto cleanup;
88 }
89
90 priv_key->len = mbedtls_pk_get_len(&cert.pk);
91 priv_key->pkcs11h_cert = pkcs11_cert;
92
93 ret = 0;
94
95 cleanup:
96 mbedtls_x509_crt_free(&cert);
97
98 return ret;
99 }
100
mbedtls_pkcs11_priv_key_free(mbedtls_pkcs11_context * priv_key)101 void mbedtls_pkcs11_priv_key_free(mbedtls_pkcs11_context *priv_key)
102 {
103 if (NULL != priv_key) {
104 pkcs11h_certificate_freeCertificate(priv_key->pkcs11h_cert);
105 }
106 }
107
mbedtls_pkcs11_decrypt(mbedtls_pkcs11_context * ctx,int mode,size_t * olen,const unsigned char * input,unsigned char * output,size_t output_max_len)108 int mbedtls_pkcs11_decrypt(mbedtls_pkcs11_context *ctx,
109 int mode, size_t *olen,
110 const unsigned char *input,
111 unsigned char *output,
112 size_t output_max_len)
113 {
114 size_t input_len, output_len;
115
116 if (NULL == ctx) {
117 return MBEDTLS_ERR_RSA_BAD_INPUT_DATA;
118 }
119
120 if (MBEDTLS_RSA_PRIVATE != mode) {
121 return MBEDTLS_ERR_RSA_BAD_INPUT_DATA;
122 }
123
124 output_len = input_len = ctx->len;
125
126 if (input_len < 16 || input_len > output_max_len) {
127 return MBEDTLS_ERR_RSA_BAD_INPUT_DATA;
128 }
129
130 /* Determine size of output buffer */
131 if (pkcs11h_certificate_decryptAny(ctx->pkcs11h_cert, CKM_RSA_PKCS, input,
132 input_len, NULL, &output_len) != CKR_OK) {
133 return MBEDTLS_ERR_RSA_BAD_INPUT_DATA;
134 }
135
136 if (output_len > output_max_len) {
137 return MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE;
138 }
139
140 if (pkcs11h_certificate_decryptAny(ctx->pkcs11h_cert, CKM_RSA_PKCS, input,
141 input_len, output, &output_len) != CKR_OK) {
142 return MBEDTLS_ERR_RSA_BAD_INPUT_DATA;
143 }
144 *olen = output_len;
145 return 0;
146 }
147
mbedtls_pkcs11_sign(mbedtls_pkcs11_context * ctx,int mode,mbedtls_md_type_t md_alg,unsigned int hashlen,const unsigned char * hash,unsigned char * sig)148 int mbedtls_pkcs11_sign(mbedtls_pkcs11_context *ctx,
149 int mode,
150 mbedtls_md_type_t md_alg,
151 unsigned int hashlen,
152 const unsigned char *hash,
153 unsigned char *sig)
154 {
155 size_t sig_len = 0, asn_len = 0, oid_size = 0;
156 unsigned char *p = sig;
157 const char *oid;
158
159 if (NULL == ctx) {
160 return MBEDTLS_ERR_RSA_BAD_INPUT_DATA;
161 }
162
163 if (MBEDTLS_RSA_PRIVATE != mode) {
164 return MBEDTLS_ERR_RSA_BAD_INPUT_DATA;
165 }
166
167 if (md_alg != MBEDTLS_MD_NONE) {
168 const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type(md_alg);
169 if (md_info == NULL) {
170 return MBEDTLS_ERR_RSA_BAD_INPUT_DATA;
171 }
172
173 if (mbedtls_oid_get_oid_by_md(md_alg, &oid, &oid_size) != 0) {
174 return MBEDTLS_ERR_RSA_BAD_INPUT_DATA;
175 }
176
177 hashlen = mbedtls_md_get_size(md_info);
178 asn_len = 10 + oid_size;
179 }
180
181 sig_len = ctx->len;
182 if (hashlen > sig_len || asn_len > sig_len ||
183 hashlen + asn_len > sig_len) {
184 return MBEDTLS_ERR_RSA_BAD_INPUT_DATA;
185 }
186
187 if (md_alg != MBEDTLS_MD_NONE) {
188 /*
189 * DigestInfo ::= SEQUENCE {
190 * digestAlgorithm DigestAlgorithmIdentifier,
191 * digest Digest }
192 *
193 * DigestAlgorithmIdentifier ::= AlgorithmIdentifier
194 *
195 * Digest ::= OCTET STRING
196 */
197 *p++ = MBEDTLS_ASN1_SEQUENCE | MBEDTLS_ASN1_CONSTRUCTED;
198 *p++ = (unsigned char) (0x08 + oid_size + hashlen);
199 *p++ = MBEDTLS_ASN1_SEQUENCE | MBEDTLS_ASN1_CONSTRUCTED;
200 *p++ = (unsigned char) (0x04 + oid_size);
201 *p++ = MBEDTLS_ASN1_OID;
202 *p++ = oid_size & 0xFF;
203 memcpy(p, oid, oid_size);
204 p += oid_size;
205 *p++ = MBEDTLS_ASN1_NULL;
206 *p++ = 0x00;
207 *p++ = MBEDTLS_ASN1_OCTET_STRING;
208 *p++ = hashlen;
209 }
210
211 memcpy(p, hash, hashlen);
212
213 if (pkcs11h_certificate_signAny(ctx->pkcs11h_cert, CKM_RSA_PKCS, sig,
214 asn_len + hashlen, sig, &sig_len) != CKR_OK) {
215 return MBEDTLS_ERR_RSA_BAD_INPUT_DATA;
216 }
217
218 return 0;
219 }
220
221 #endif /* defined(MBEDTLS_PKCS11_C) */
222