/** * \file pkcs11.c * * \brief Wrapper for PKCS#11 library libpkcs11-helper * * \author Adriaan de Jong <dejong@fox-it.com> * * Copyright The Mbed TLS Contributors * SPDX-License-Identifier: Apache-2.0 * * Licensed under the Apache License, Version 2.0 (the "License"); you may * not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include "mbedtls/pkcs11.h" #if defined(MBEDTLS_PKCS11_C) #include "mbedtls/md.h" #include "mbedtls/oid.h" #include "mbedtls/x509_crt.h" #if defined(MBEDTLS_PLATFORM_C) #include "mbedtls/platform.h" #else #include <stdlib.h> #define mbedtls_calloc calloc #define mbedtls_free free #endif #include <string.h> void mbedtls_pkcs11_init( mbedtls_pkcs11_context *ctx ) { memset( ctx, 0, sizeof( mbedtls_pkcs11_context ) ); } int mbedtls_pkcs11_x509_cert_bind( mbedtls_x509_crt *cert, pkcs11h_certificate_t pkcs11_cert ) { int ret = 1; unsigned char *cert_blob = NULL; size_t cert_blob_size = 0; if( cert == NULL ) { ret = 2; goto cleanup; } if( pkcs11h_certificate_getCertificateBlob( pkcs11_cert, NULL, &cert_blob_size ) != CKR_OK ) { ret = 3; goto cleanup; } cert_blob = mbedtls_calloc( 1, cert_blob_size ); if( NULL == cert_blob ) { ret = 4; goto cleanup; } if( pkcs11h_certificate_getCertificateBlob( pkcs11_cert, cert_blob, &cert_blob_size ) != CKR_OK ) { ret = 5; goto cleanup; } if( 0 != mbedtls_x509_crt_parse( cert, cert_blob, cert_blob_size ) ) { ret = 6; goto cleanup; } ret = 0; cleanup: if( NULL != cert_blob ) mbedtls_free( cert_blob ); return( ret ); } int mbedtls_pkcs11_priv_key_bind( mbedtls_pkcs11_context *priv_key, pkcs11h_certificate_t pkcs11_cert ) { int ret = 1; mbedtls_x509_crt cert; mbedtls_x509_crt_init( &cert ); if( priv_key == NULL ) goto cleanup; if( 0 != mbedtls_pkcs11_x509_cert_bind( &cert, pkcs11_cert ) ) goto cleanup; priv_key->len = mbedtls_pk_get_len( &cert.pk ); priv_key->pkcs11h_cert = pkcs11_cert; ret = 0; cleanup: mbedtls_x509_crt_free( &cert ); return( ret ); } void mbedtls_pkcs11_priv_key_free( mbedtls_pkcs11_context *priv_key ) { if( NULL != priv_key ) pkcs11h_certificate_freeCertificate( priv_key->pkcs11h_cert ); } int mbedtls_pkcs11_decrypt( mbedtls_pkcs11_context *ctx, int mode, size_t *olen, const unsigned char *input, unsigned char *output, size_t output_max_len ) { size_t input_len, output_len; if( NULL == ctx ) return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); if( MBEDTLS_RSA_PRIVATE != mode ) return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); output_len = input_len = ctx->len; if( input_len < 16 || input_len > output_max_len ) return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); /* Determine size of output buffer */ if( pkcs11h_certificate_decryptAny( ctx->pkcs11h_cert, CKM_RSA_PKCS, input, input_len, NULL, &output_len ) != CKR_OK ) { return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); } if( output_len > output_max_len ) return( MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE ); if( pkcs11h_certificate_decryptAny( ctx->pkcs11h_cert, CKM_RSA_PKCS, input, input_len, output, &output_len ) != CKR_OK ) { return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); } *olen = output_len; return( 0 ); } int 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 ) { size_t sig_len = 0, asn_len = 0, oid_size = 0; unsigned char *p = sig; const char *oid; if( NULL == ctx ) return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); if( MBEDTLS_RSA_PRIVATE != mode ) return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); if( md_alg != MBEDTLS_MD_NONE ) { const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type( md_alg ); if( md_info == NULL ) return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); if( mbedtls_oid_get_oid_by_md( md_alg, &oid, &oid_size ) != 0 ) return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); hashlen = mbedtls_md_get_size( md_info ); asn_len = 10 + oid_size; } sig_len = ctx->len; if( hashlen > sig_len || asn_len > sig_len || hashlen + asn_len > sig_len ) { return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); } if( md_alg != MBEDTLS_MD_NONE ) { /* * DigestInfo ::= SEQUENCE { * digestAlgorithm DigestAlgorithmIdentifier, * digest Digest } * * DigestAlgorithmIdentifier ::= AlgorithmIdentifier * * Digest ::= OCTET STRING */ *p++ = MBEDTLS_ASN1_SEQUENCE | MBEDTLS_ASN1_CONSTRUCTED; *p++ = (unsigned char) ( 0x08 + oid_size + hashlen ); *p++ = MBEDTLS_ASN1_SEQUENCE | MBEDTLS_ASN1_CONSTRUCTED; *p++ = (unsigned char) ( 0x04 + oid_size ); *p++ = MBEDTLS_ASN1_OID; *p++ = oid_size & 0xFF; memcpy( p, oid, oid_size ); p += oid_size; *p++ = MBEDTLS_ASN1_NULL; *p++ = 0x00; *p++ = MBEDTLS_ASN1_OCTET_STRING; *p++ = hashlen; } memcpy( p, hash, hashlen ); if( pkcs11h_certificate_signAny( ctx->pkcs11h_cert, CKM_RSA_PKCS, sig, asn_len + hashlen, sig, &sig_len ) != CKR_OK ) { return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); } return( 0 ); } #endif /* defined(MBEDTLS_PKCS11_C) */