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) 2006-2014, ARM Limited, All Rights Reserved
00009  *
00010  *  This file is part of mbed TLS (https://tls.mbed.org)
00011  *
00012  *  This program is free software; you can redistribute it and/or modify
00013  *  it under the terms of the GNU General Public License as published by
00014  *  the Free Software Foundation; either version 2 of the License, or
00015  *  (at your option) any later version.
00016  *
00017  *  This program is distributed in the hope that it will be useful,
00018  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00019  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00020  *  GNU General Public License for more details.
00021  *
00022  *  You should have received a copy of the GNU General Public License along
00023  *  with this program; if not, write to the Free Software Foundation, Inc.,
00024  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
00025  */
00026 
00027 #include "polarssl/pkcs11.h"
00028 
00029 #if defined(POLARSSL_PKCS11_C)
00030 
00031 #include "polarssl/md.h"
00032 #include "polarssl/oid.h"
00033 #include "polarssl/x509_crt.h"
00034 
00035 #if defined(POLARSSL_PLATFORM_C)
00036 #include "polarssl/platform.h"
00037 #else
00038 #include <stdlib.h>
00039 #define polarssl_malloc     malloc
00040 #define polarssl_free       free
00041 #endif
00042 
00043 int pkcs11_x509_cert_init( x509_crt *cert, pkcs11h_certificate_t pkcs11_cert )
00044 {
00045     int ret = 1;
00046     unsigned char *cert_blob = NULL;
00047     size_t cert_blob_size = 0;
00048 
00049     if( cert == NULL )
00050     {
00051         ret = 2;
00052         goto cleanup;
00053     }
00054 
00055     if( pkcs11h_certificate_getCertificateBlob( pkcs11_cert, NULL,
00056                                                 &cert_blob_size ) != CKR_OK )
00057     {
00058         ret = 3;
00059         goto cleanup;
00060     }
00061 
00062     cert_blob = polarssl_malloc( cert_blob_size );
00063     if( NULL == cert_blob )
00064     {
00065         ret = 4;
00066         goto cleanup;
00067     }
00068 
00069     if( pkcs11h_certificate_getCertificateBlob( pkcs11_cert, cert_blob,
00070                                                 &cert_blob_size ) != CKR_OK )
00071     {
00072         ret = 5;
00073         goto cleanup;
00074     }
00075 
00076     if( 0 != x509_crt_parse( cert, cert_blob, cert_blob_size ) )
00077     {
00078         ret = 6;
00079         goto cleanup;
00080     }
00081 
00082     ret = 0;
00083 
00084 cleanup:
00085     if( NULL != cert_blob )
00086         polarssl_free( cert_blob );
00087 
00088     return( ret );
00089 }
00090 
00091 
00092 int pkcs11_priv_key_init( pkcs11_context *priv_key,
00093         pkcs11h_certificate_t pkcs11_cert )
00094 {
00095     int ret = 1;
00096     x509_crt cert;
00097 
00098     x509_crt_init( &cert );
00099 
00100     if( priv_key == NULL )
00101         goto cleanup;
00102 
00103     if( 0 != pkcs11_x509_cert_init( &cert, pkcs11_cert ) )
00104         goto cleanup;
00105 
00106     priv_key->len = pk_get_len( &cert.pk );
00107     priv_key->pkcs11h_cert = pkcs11_cert;
00108 
00109     ret = 0;
00110 
00111 cleanup:
00112     x509_crt_free( &cert );
00113 
00114     return( ret );
00115 }
00116 
00117 void pkcs11_priv_key_free( pkcs11_context *priv_key )
00118 {
00119     if( NULL != priv_key )
00120         pkcs11h_certificate_freeCertificate( priv_key->pkcs11h_cert );
00121 }
00122 
00123 int pkcs11_decrypt( pkcs11_context *ctx,
00124                        int mode, size_t *olen,
00125                        const unsigned char *input,
00126                        unsigned char *output,
00127                        size_t output_max_len )
00128 {
00129     size_t input_len, output_len;
00130 
00131     if( NULL == ctx )
00132         return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
00133 
00134     if( RSA_PRIVATE != mode )
00135         return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
00136 
00137     output_len = input_len = ctx->len;
00138 
00139     if( input_len < 16 || input_len > output_max_len )
00140         return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
00141 
00142     /* Determine size of output buffer */
00143     if( pkcs11h_certificate_decryptAny( ctx->pkcs11h_cert, CKM_RSA_PKCS, input,
00144             input_len, NULL, &output_len ) != CKR_OK )
00145     {
00146         return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
00147     }
00148 
00149     if( output_len > output_max_len )
00150         return( POLARSSL_ERR_RSA_OUTPUT_TOO_LARGE );
00151 
00152     if( pkcs11h_certificate_decryptAny( ctx->pkcs11h_cert, CKM_RSA_PKCS, input,
00153             input_len, output, &output_len ) != CKR_OK )
00154     {
00155         return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
00156     }
00157     *olen = output_len;
00158     return( 0 );
00159 }
00160 
00161 int pkcs11_sign( pkcs11_context *ctx,
00162                     int mode,
00163                     md_type_t md_alg,
00164                     unsigned int hashlen,
00165                     const unsigned char *hash,
00166                     unsigned char *sig )
00167 {
00168     size_t sig_len = 0, asn_len = 0, oid_size = 0;
00169     unsigned char *p = sig;
00170     const char *oid;
00171 
00172     if( NULL == ctx )
00173         return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
00174 
00175     if( RSA_PRIVATE != mode )
00176         return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
00177 
00178     if( md_alg != POLARSSL_MD_NONE )
00179     {
00180         const md_info_t *md_info = md_info_from_type( md_alg );
00181         if( md_info == NULL )
00182             return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
00183 
00184         if( oid_get_oid_by_md( md_alg, &oid, &oid_size ) != 0 )
00185             return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
00186 
00187         hashlen = md_get_size( md_info );
00188         asn_len = 10 + oid_size;
00189     }
00190 
00191     sig_len = ctx->len;
00192     if( hashlen > sig_len || asn_len > sig_len ||
00193         hashlen + asn_len > sig_len )
00194     {
00195         return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
00196     }
00197 
00198     if( md_alg != POLARSSL_MD_NONE )
00199     {
00200         /*
00201          * DigestInfo ::= SEQUENCE {
00202          *   digestAlgorithm DigestAlgorithmIdentifier,
00203          *   digest Digest }
00204          *
00205          * DigestAlgorithmIdentifier ::= AlgorithmIdentifier
00206          *
00207          * Digest ::= OCTET STRING
00208          */
00209         *p++ = ASN1_SEQUENCE | ASN1_CONSTRUCTED;
00210         *p++ = (unsigned char) ( 0x08 + oid_size + hashlen );
00211         *p++ = ASN1_SEQUENCE | ASN1_CONSTRUCTED;
00212         *p++ = (unsigned char) ( 0x04 + oid_size );
00213         *p++ = ASN1_OID;
00214         *p++ = oid_size & 0xFF;
00215         memcpy( p, oid, oid_size );
00216         p += oid_size;
00217         *p++ = ASN1_NULL;
00218         *p++ = 0x00;
00219         *p++ = ASN1_OCTET_STRING;
00220         *p++ = hashlen;
00221     }
00222 
00223     memcpy( p, hash, hashlen );
00224 
00225     if( pkcs11h_certificate_signAny( ctx->pkcs11h_cert, CKM_RSA_PKCS, sig,
00226             asn_len + hashlen, sig, &sig_len ) != CKR_OK )
00227     {
00228         return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
00229     }
00230 
00231     return( 0 );
00232 }
00233 
00234 #endif /* defined(POLARSSL_PKCS11_C) */
00235