Modified mbed TLS headers for AES functionality only to reduce build size
Dependents: BLE_Gateway_Linker_fix BLE_Gateway
Fork of mbedtls by
source/x509write_csr.c
- Committer:
- Christopher Haster
- Date:
- 2016-01-22
- Revision:
- 1:24750b9ad5ef
File content as of revision 1:24750b9ad5ef:
/* * 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 ) ); 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 */