Simon Cooksey
Pinned to some recent date
Diff: features/mbedtls/src/x509write_csr.c
- Revision:
- 0:fb7af294d5d9
diff -r 000000000000 -r fb7af294d5d9 features/mbedtls/src/x509write_csr.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/features/mbedtls/src/x509write_csr.c Thu Nov 17 16:43:53 2016 +0000
@@ -0,0 +1,259 @@
+/*
+ * X.509 Certificate Signing Request writing
+ *
+ * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
+ * 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.
+ *
+ * This file is part of mbed TLS (https://tls.mbed.org)
+ */
+/*
+ * References:
+ * - CSRs: PKCS#10 v1.7 aka RFC 2986
+ * - attributes: PKCS#9 v2.0 aka RFC 2985
+ */
+
+#if !defined(MBEDTLS_CONFIG_FILE)
+#include "mbedtls/config.h"
+#else
+#include MBEDTLS_CONFIG_FILE
+#endif
+
+#if defined(MBEDTLS_X509_CSR_WRITE_C)
+
+#include "mbedtls/x509_csr.h"
+#include "mbedtls/oid.h"
+#include "mbedtls/asn1write.h"
+
+#include <string.h>
+#include <stdlib.h>
+
+#if defined(MBEDTLS_PEM_WRITE_C)
+#include "mbedtls/pem.h"
+#endif
+
+/* Implementation that should never be optimized out by the compiler */
+static void mbedtls_zeroize( void *v, size_t n ) {
+ volatile unsigned char *p = v; while( n-- ) *p++ = 0;
+}
+
+void mbedtls_x509write_csr_init( mbedtls_x509write_csr *ctx )
+{
+ memset( ctx, 0, sizeof(mbedtls_x509write_csr) );
+}
+
+void mbedtls_x509write_csr_free( mbedtls_x509write_csr *ctx )
+{
+ mbedtls_asn1_free_named_data_list( &ctx->subject );
+ mbedtls_asn1_free_named_data_list( &ctx->extensions );
+
+ mbedtls_zeroize( ctx, sizeof(mbedtls_x509write_csr) );
+}
+
+void mbedtls_x509write_csr_set_md_alg( mbedtls_x509write_csr *ctx, mbedtls_md_type_t md_alg )
+{
+ ctx->md_alg = md_alg;
+}
+
+void mbedtls_x509write_csr_set_key( mbedtls_x509write_csr *ctx, mbedtls_pk_context *key )
+{
+ ctx->key = key;
+}
+
+int mbedtls_x509write_csr_set_subject_name( mbedtls_x509write_csr *ctx,
+ const char *subject_name )
+{
+ return mbedtls_x509_string_to_names( &ctx->subject, subject_name );
+}
+
+int mbedtls_x509write_csr_set_extension( mbedtls_x509write_csr *ctx,
+ const char *oid, size_t oid_len,
+ const unsigned char *val, size_t val_len )
+{
+ return mbedtls_x509_set_extension( &ctx->extensions, oid, oid_len,
+ 0, val, val_len );
+}
+
+int mbedtls_x509write_csr_set_key_usage( mbedtls_x509write_csr *ctx, unsigned char key_usage )
+{
+ unsigned char buf[4];
+ unsigned char *c;
+ int ret;
+
+ c = buf + 4;
+
+ if( ( ret = mbedtls_asn1_write_bitstring( &c, buf, &key_usage, 7 ) ) != 4 )
+ return( ret );
+
+ ret = mbedtls_x509write_csr_set_extension( ctx, MBEDTLS_OID_KEY_USAGE,
+ MBEDTLS_OID_SIZE( MBEDTLS_OID_KEY_USAGE ),
+ buf, 4 );
+ if( ret != 0 )
+ return( ret );
+
+ return( 0 );
+}
+
+int mbedtls_x509write_csr_set_ns_cert_type( mbedtls_x509write_csr *ctx,
+ unsigned char ns_cert_type )
+{
+ unsigned char buf[4];
+ unsigned char *c;
+ int ret;
+
+ c = buf + 4;
+
+ if( ( ret = mbedtls_asn1_write_bitstring( &c, buf, &ns_cert_type, 8 ) ) != 4 )
+ return( ret );
+
+ ret = mbedtls_x509write_csr_set_extension( ctx, MBEDTLS_OID_NS_CERT_TYPE,
+ MBEDTLS_OID_SIZE( MBEDTLS_OID_NS_CERT_TYPE ),
+ buf, 4 );
+ if( ret != 0 )
+ return( ret );
+
+ return( 0 );
+}
+
+int mbedtls_x509write_csr_der( mbedtls_x509write_csr *ctx, unsigned char *buf, size_t size,
+ int (*f_rng)(void *, unsigned char *, size_t),
+ void *p_rng )
+{
+ int ret;
+ const char *sig_oid;
+ size_t sig_oid_len = 0;
+ unsigned char *c, *c2;
+ unsigned char hash[64];
+ unsigned char sig[MBEDTLS_MPI_MAX_SIZE];
+ unsigned char tmp_buf[2048];
+ size_t pub_len = 0, sig_and_oid_len = 0, sig_len;
+ size_t len = 0;
+ mbedtls_pk_type_t pk_alg;
+
+ /*
+ * Prepare data to be signed in tmp_buf
+ */
+ c = tmp_buf + sizeof( tmp_buf );
+
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_x509_write_extensions( &c, tmp_buf, ctx->extensions ) );
+
+ if( len )
+ {
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) );
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED |
+ MBEDTLS_ASN1_SEQUENCE ) );
+
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) );
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED |
+ MBEDTLS_ASN1_SET ) );
+
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_oid( &c, tmp_buf, MBEDTLS_OID_PKCS9_CSR_EXT_REQ,
+ MBEDTLS_OID_SIZE( MBEDTLS_OID_PKCS9_CSR_EXT_REQ ) ) );
+
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) );
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED |
+ MBEDTLS_ASN1_SEQUENCE ) );
+ }
+
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) );
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED |
+ MBEDTLS_ASN1_CONTEXT_SPECIFIC ) );
+
+ MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_pk_write_pubkey_der( ctx->key,
+ tmp_buf, c - tmp_buf ) );
+ c -= pub_len;
+ len += pub_len;
+
+ /*
+ * Subject ::= Name
+ */
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_x509_write_names( &c, tmp_buf, ctx->subject ) );
+
+ /*
+ * Version ::= INTEGER { v1(0), v2(1), v3(2) }
+ */
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_int( &c, tmp_buf, 0 ) );
+
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) );
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED |
+ MBEDTLS_ASN1_SEQUENCE ) );
+
+ /*
+ * Prepare signature
+ */
+ mbedtls_md( mbedtls_md_info_from_type( ctx->md_alg ), c, len, hash );
+
+ pk_alg = mbedtls_pk_get_type( ctx->key );
+ if( pk_alg == MBEDTLS_PK_ECKEY )
+ pk_alg = MBEDTLS_PK_ECDSA;
+
+ if( ( ret = mbedtls_pk_sign( ctx->key, ctx->md_alg, hash, 0, sig, &sig_len,
+ f_rng, p_rng ) ) != 0 ||
+ ( ret = mbedtls_oid_get_oid_by_sig_alg( pk_alg, ctx->md_alg,
+ &sig_oid, &sig_oid_len ) ) != 0 )
+ {
+ return( ret );
+ }
+
+ /*
+ * Write data to output buffer
+ */
+ c2 = buf + size;
+ MBEDTLS_ASN1_CHK_ADD( sig_and_oid_len, mbedtls_x509_write_sig( &c2, buf,
+ sig_oid, sig_oid_len, sig, sig_len ) );
+
+ if( len > (size_t)( c2 - buf ) )
+ return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
+
+ c2 -= len;
+ memcpy( c2, c, len );
+
+ len += sig_and_oid_len;
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c2, buf, len ) );
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c2, buf, MBEDTLS_ASN1_CONSTRUCTED |
+ MBEDTLS_ASN1_SEQUENCE ) );
+
+ return( (int) len );
+}
+
+#define PEM_BEGIN_CSR "-----BEGIN CERTIFICATE REQUEST-----\n"
+#define PEM_END_CSR "-----END CERTIFICATE REQUEST-----\n"
+
+#if defined(MBEDTLS_PEM_WRITE_C)
+int mbedtls_x509write_csr_pem( mbedtls_x509write_csr *ctx, unsigned char *buf, size_t size,
+ int (*f_rng)(void *, unsigned char *, size_t),
+ void *p_rng )
+{
+ int ret;
+ unsigned char output_buf[4096];
+ size_t olen = 0;
+
+ if( ( ret = mbedtls_x509write_csr_der( ctx, output_buf, sizeof(output_buf),
+ f_rng, p_rng ) ) < 0 )
+ {
+ return( ret );
+ }
+
+ if( ( ret = mbedtls_pem_write_buffer( PEM_BEGIN_CSR, PEM_END_CSR,
+ output_buf + sizeof(output_buf) - ret,
+ ret, buf, size, &olen ) ) != 0 )
+ {
+ return( ret );
+ }
+
+ return( 0 );
+}
+#endif /* MBEDTLS_PEM_WRITE_C */
+
+#endif /* MBEDTLS_X509_CSR_WRITE_C */