pkcs11.c

00001 /**
00002  * \file pkcs11.c
00003  *
00004  * \brief Wrapper for PKCS#11 library libpkcs11-helper
00005  *
00006  * \author Adriaan de Jong <dejong@fox-it.com>
00007  *
00008  *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
00009  *  SPDX-License-Identifier: Apache-2.0
00010  *
00011  *  Licensed under the Apache License, Version 2.0 (the "License"); you may
00012  *  not use this file except in compliance with the License.
00013  *  You may obtain a copy of the License at
00014  *
00015  *  http://www.apache.org/licenses/LICENSE-2.0
00016  *
00017  *  Unless required by applicable law or agreed to in writing, software
00018  *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
00019  *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00020  *  See the License for the specific language governing permissions and
00021  *  limitations under the License.
00022  *
00023  *  This file is part of mbed TLS (https://tls.mbed.org)
00024  */
00025 
00026 #include "mbedtls/pkcs11.h"
00027 
00028 #if defined(MBEDTLS_PKCS11_C)
00029 
00030 #include "mbedtls/md.h"
00031 #include "mbedtls/oid.h"
00032 #include "mbedtls/x509_crt.h"
00033 
00034 #if defined(MBEDTLS_PLATFORM_C)
00035 #include "mbedtls/platform.h"
00036 #else
00037 #include <stdlib.h>
00038 #define mbedtls_calloc    calloc
00039 #define mbedtls_free       free
00040 #endif
00041 
00042 #include <string.h>
00043 
00044 void mbedtls_pkcs11_init( mbedtls_pkcs11_context *ctx )
00045 {
00046     memset( ctx, 0, sizeof( mbedtls_pkcs11_context ) );
00047 }
00048 
00049 int mbedtls_pkcs11_x509_cert_bind( mbedtls_x509_crt *cert, pkcs11h_certificate_t pkcs11_cert )
00050 {
00051     int ret = 1;
00052     unsigned char *cert_blob = NULL;
00053     size_t cert_blob_size = 0;
00054 
00055     if( cert == NULL )
00056     {
00057         ret = 2;
00058         goto cleanup;
00059     }
00060 
00061     if( pkcs11h_certificate_getCertificateBlob( pkcs11_cert, NULL,
00062                                                 &cert_blob_size ) != CKR_OK )
00063     {
00064         ret = 3;
00065         goto cleanup;
00066     }
00067 
00068     cert_blob = mbedtls_calloc( 1, cert_blob_size );
00069     if( NULL == cert_blob )
00070     {
00071         ret = 4;
00072         goto cleanup;
00073     }
00074 
00075     if( pkcs11h_certificate_getCertificateBlob( pkcs11_cert, cert_blob,
00076                                                 &cert_blob_size ) != CKR_OK )
00077     {
00078         ret = 5;
00079         goto cleanup;
00080     }
00081 
00082     if( 0 != mbedtls_x509_crt_parse( cert, cert_blob, cert_blob_size ) )
00083     {
00084         ret = 6;
00085         goto cleanup;
00086     }
00087 
00088     ret = 0;
00089 
00090 cleanup:
00091     if( NULL != cert_blob )
00092         mbedtls_free( cert_blob );
00093 
00094     return( ret );
00095 }
00096 
00097 
00098 int mbedtls_pkcs11_priv_key_bind( mbedtls_pkcs11_context *priv_key,
00099         pkcs11h_certificate_t pkcs11_cert )
00100 {
00101     int ret = 1;
00102     mbedtls_x509_crt cert;
00103 
00104     mbedtls_x509_crt_init( &cert );
00105 
00106     if( priv_key == NULL )
00107         goto cleanup;
00108 
00109     if( 0 != mbedtls_pkcs11_x509_cert_bind( &cert, pkcs11_cert ) )
00110         goto cleanup;
00111 
00112     priv_key->len = mbedtls_pk_get_len( &cert.pk );
00113     priv_key->pkcs11h_cert = pkcs11_cert;
00114 
00115     ret = 0;
00116 
00117 cleanup:
00118     mbedtls_x509_crt_free( &cert );
00119 
00120     return( ret );
00121 }
00122 
00123 void mbedtls_pkcs11_priv_key_free( mbedtls_pkcs11_context *priv_key )
00124 {
00125     if( NULL != priv_key )
00126         pkcs11h_certificate_freeCertificate( priv_key->pkcs11h_cert );
00127 }
00128 
00129 int mbedtls_pkcs11_decrypt( mbedtls_pkcs11_context *ctx,
00130                        int mode, size_t *olen,
00131                        const unsigned char *input,
00132                        unsigned char *output,
00133                        size_t output_max_len )
00134 {
00135     size_t input_len, output_len;
00136 
00137     if( NULL == ctx )
00138         return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
00139 
00140     if( MBEDTLS_RSA_PRIVATE != mode )
00141         return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
00142 
00143     output_len = input_len = ctx->len;
00144 
00145     if( input_len < 16 || input_len > output_max_len )
00146         return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
00147 
00148     /* Determine size of output buffer */
00149     if( pkcs11h_certificate_decryptAny( ctx->pkcs11h_cert, CKM_RSA_PKCS, input,
00150             input_len, NULL, &output_len ) != CKR_OK )
00151     {
00152         return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
00153     }
00154 
00155     if( output_len > output_max_len )
00156         return( MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE );
00157 
00158     if( pkcs11h_certificate_decryptAny( ctx->pkcs11h_cert, CKM_RSA_PKCS, input,
00159             input_len, output, &output_len ) != CKR_OK )
00160     {
00161         return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
00162     }
00163     *olen = output_len;
00164     return( 0 );
00165 }
00166 
00167 int mbedtls_pkcs11_sign( mbedtls_pkcs11_context *ctx,
00168                     int mode,
00169                     mbedtls_md_type_t md_alg,
00170                     unsigned int hashlen,
00171                     const unsigned char *hash,
00172                     unsigned char *sig )
00173 {
00174     size_t sig_len = 0, asn_len = 0, oid_size = 0;
00175     unsigned char *p = sig;
00176     const char *oid;
00177 
00178     if( NULL == ctx )
00179         return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
00180 
00181     if( MBEDTLS_RSA_PRIVATE != mode )
00182         return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
00183 
00184     if( md_alg != MBEDTLS_MD_NONE )
00185     {
00186         const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type( md_alg );
00187         if( md_info == NULL )
00188             return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
00189 
00190         if( mbedtls_oid_get_oid_by_md( md_alg, &oid, &oid_size ) != 0 )
00191             return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
00192 
00193         hashlen = mbedtls_md_get_size( md_info );
00194         asn_len = 10 + oid_size;
00195     }
00196 
00197     sig_len = ctx->len;
00198     if( hashlen > sig_len || asn_len > sig_len ||
00199         hashlen + asn_len > sig_len )
00200     {
00201         return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
00202     }
00203 
00204     if( md_alg != MBEDTLS_MD_NONE )
00205     {
00206         /*
00207          * DigestInfo ::= SEQUENCE {
00208          *   digestAlgorithm DigestAlgorithmIdentifier,
00209          *   digest Digest }
00210          *
00211          * DigestAlgorithmIdentifier ::= AlgorithmIdentifier
00212          *
00213          * Digest ::= OCTET STRING
00214          */
00215         *p++ = MBEDTLS_ASN1_SEQUENCE | MBEDTLS_ASN1_CONSTRUCTED;
00216         *p++ = (unsigned char) ( 0x08 + oid_size + hashlen );
00217         *p++ = MBEDTLS_ASN1_SEQUENCE | MBEDTLS_ASN1_CONSTRUCTED;
00218         *p++ = (unsigned char) ( 0x04 + oid_size );
00219         *p++ = MBEDTLS_ASN1_OID;
00220         *p++ = oid_size & 0xFF;
00221         memcpy( p, oid, oid_size );
00222         p += oid_size;
00223         *p++ = MBEDTLS_ASN1_NULL;
00224         *p++ = 0x00;
00225         *p++ = MBEDTLS_ASN1_OCTET_STRING;
00226         *p++ = hashlen;
00227     }
00228 
00229     memcpy( p, hash, hashlen );
00230 
00231     if( pkcs11h_certificate_signAny( ctx->pkcs11h_cert, CKM_RSA_PKCS, sig,
00232             asn_len + hashlen, sig, &sig_len ) != CKR_OK )
00233     {
00234         return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
00235     }
00236 
00237     return( 0 );
00238 }
00239 
00240 #endif /* defined(MBEDTLS_PKCS11_C) */