| /* |
| * Public Key layer for writing key files and structures |
| * |
| * Copyright (C) 2006-2014, Brainspark B.V. |
| * |
| * This file is part of PolarSSL (http://www.polarssl.org) |
| * Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org> |
| * |
| * All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License along |
| * with this program; if not, write to the Free Software Foundation, Inc., |
| * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| */ |
| |
| #if !defined(POLARSSL_CONFIG_FILE) |
| #include "polarssl/config.h" |
| #else |
| #include POLARSSL_CONFIG_FILE |
| #endif |
| |
| #if defined(POLARSSL_PK_WRITE_C) |
| |
| #include "polarssl/pk.h" |
| #include "polarssl/asn1write.h" |
| #include "polarssl/oid.h" |
| |
| #if defined(POLARSSL_RSA_C) |
| #include "polarssl/rsa.h" |
| #endif |
| #if defined(POLARSSL_ECP_C) |
| #include "polarssl/ecp.h" |
| #endif |
| #if defined(POLARSSL_ECDSA_C) |
| #include "polarssl/ecdsa.h" |
| #endif |
| #if defined(POLARSSL_PEM_WRITE_C) |
| #include "polarssl/pem.h" |
| #endif |
| |
| #if defined(POLARSSL_PLATFORM_C) |
| #include "polarssl/platform.h" |
| #else |
| #include <stdlib.h> |
| #define polarssl_malloc malloc |
| #define polarssl_free free |
| #endif |
| |
| #if defined(POLARSSL_RSA_C) |
| /* |
| * RSAPublicKey ::= SEQUENCE { |
| * modulus INTEGER, -- n |
| * publicExponent INTEGER -- e |
| * } |
| */ |
| static int pk_write_rsa_pubkey( unsigned char **p, unsigned char *start, |
| rsa_context *rsa ) |
| { |
| int ret; |
| size_t len = 0; |
| |
| ASN1_CHK_ADD( len, asn1_write_mpi( p, start, &rsa->E ) ); |
| ASN1_CHK_ADD( len, asn1_write_mpi( p, start, &rsa->N ) ); |
| |
| ASN1_CHK_ADD( len, asn1_write_len( p, start, len ) ); |
| ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ); |
| |
| return( (int) len ); |
| } |
| #endif /* POLARSSL_RSA_C */ |
| |
| #if defined(POLARSSL_ECP_C) |
| /* |
| * EC public key is an EC point |
| */ |
| static int pk_write_ec_pubkey( unsigned char **p, unsigned char *start, |
| ecp_keypair *ec ) |
| { |
| int ret; |
| size_t len = 0; |
| unsigned char buf[POLARSSL_ECP_MAX_PT_LEN]; |
| |
| if( ( ret = ecp_point_write_binary( &ec->grp, &ec->Q, |
| POLARSSL_ECP_PF_UNCOMPRESSED, |
| &len, buf, sizeof( buf ) ) ) != 0 ) |
| { |
| return( ret ); |
| } |
| |
| if( *p - start < (int) len ) |
| return( POLARSSL_ERR_ASN1_BUF_TOO_SMALL ); |
| |
| *p -= len; |
| memcpy( *p, buf, len ); |
| |
| return( (int) len ); |
| } |
| |
| /* |
| * ECParameters ::= CHOICE { |
| * namedCurve OBJECT IDENTIFIER |
| * } |
| */ |
| static int pk_write_ec_param( unsigned char **p, unsigned char *start, |
| ecp_keypair *ec ) |
| { |
| int ret; |
| size_t len = 0; |
| const char *oid; |
| size_t oid_len; |
| |
| if( ( ret = oid_get_oid_by_ec_grp( ec->grp.id, &oid, &oid_len ) ) != 0 ) |
| return( ret ); |
| |
| ASN1_CHK_ADD( len, asn1_write_oid( p, start, oid, oid_len ) ); |
| |
| return( (int) len ); |
| } |
| #endif /* POLARSSL_ECP_C */ |
| |
| int pk_write_pubkey( unsigned char **p, unsigned char *start, |
| const pk_context *key ) |
| { |
| int ret; |
| size_t len = 0; |
| |
| #if defined(POLARSSL_RSA_C) |
| if( pk_get_type( key ) == POLARSSL_PK_RSA ) |
| ASN1_CHK_ADD( len, pk_write_rsa_pubkey( p, start, pk_rsa( *key ) ) ); |
| else |
| #endif |
| #if defined(POLARSSL_ECP_C) |
| if( pk_get_type( key ) == POLARSSL_PK_ECKEY ) |
| ASN1_CHK_ADD( len, pk_write_ec_pubkey( p, start, pk_ec( *key ) ) ); |
| else |
| #endif |
| return( POLARSSL_ERR_PK_FEATURE_UNAVAILABLE ); |
| |
| return( (int) len ); |
| } |
| |
| int pk_write_pubkey_der( pk_context *key, unsigned char *buf, size_t size ) |
| { |
| int ret; |
| unsigned char *c; |
| size_t len = 0, par_len = 0, oid_len; |
| const char *oid; |
| |
| c = buf + size; |
| |
| ASN1_CHK_ADD( len, pk_write_pubkey( &c, buf, key ) ); |
| |
| if( c - buf < 1 ) |
| return( POLARSSL_ERR_ASN1_BUF_TOO_SMALL ); |
| |
| /* |
| * SubjectPublicKeyInfo ::= SEQUENCE { |
| * algorithm AlgorithmIdentifier, |
| * subjectPublicKey BIT STRING } |
| */ |
| *--c = 0; |
| len += 1; |
| |
| ASN1_CHK_ADD( len, asn1_write_len( &c, buf, len ) ); |
| ASN1_CHK_ADD( len, asn1_write_tag( &c, buf, ASN1_BIT_STRING ) ); |
| |
| if( ( ret = oid_get_oid_by_pk_alg( pk_get_type( key ), |
| &oid, &oid_len ) ) != 0 ) |
| { |
| return( ret ); |
| } |
| |
| #if defined(POLARSSL_ECP_C) |
| if( pk_get_type( key ) == POLARSSL_PK_ECKEY ) |
| { |
| ASN1_CHK_ADD( par_len, pk_write_ec_param( &c, buf, pk_ec( *key ) ) ); |
| } |
| #endif |
| |
| ASN1_CHK_ADD( len, asn1_write_algorithm_identifier( &c, buf, oid, oid_len, |
| par_len ) ); |
| |
| ASN1_CHK_ADD( len, asn1_write_len( &c, buf, len ) ); |
| ASN1_CHK_ADD( len, asn1_write_tag( &c, buf, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ); |
| |
| return( (int) len ); |
| } |
| |
| int pk_write_key_der( pk_context *key, unsigned char *buf, size_t size ) |
| { |
| int ret; |
| unsigned char *c = buf + size; |
| size_t len = 0; |
| |
| #if defined(POLARSSL_RSA_C) |
| if( pk_get_type( key ) == POLARSSL_PK_RSA ) |
| { |
| rsa_context *rsa = pk_rsa( *key ); |
| |
| ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->QP ) ); |
| ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->DQ ) ); |
| ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->DP ) ); |
| ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->Q ) ); |
| ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->P ) ); |
| ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->D ) ); |
| ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->E ) ); |
| ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->N ) ); |
| ASN1_CHK_ADD( len, asn1_write_int( &c, buf, 0 ) ); |
| |
| ASN1_CHK_ADD( len, asn1_write_len( &c, buf, len ) ); |
| ASN1_CHK_ADD( len, asn1_write_tag( &c, buf, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ); |
| } |
| else |
| #endif |
| #if defined(POLARSSL_ECP_C) |
| if( pk_get_type( key ) == POLARSSL_PK_ECKEY ) |
| { |
| ecp_keypair *ec = pk_ec( *key ); |
| size_t pub_len = 0, par_len = 0; |
| |
| /* |
| * RFC 5915, or SEC1 Appendix C.4 |
| * |
| * ECPrivateKey ::= SEQUENCE { |
| * version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1), |
| * privateKey OCTET STRING, |
| * parameters [0] ECParameters {{ NamedCurve }} OPTIONAL, |
| * publicKey [1] BIT STRING OPTIONAL |
| * } |
| */ |
| |
| /* publicKey */ |
| ASN1_CHK_ADD( pub_len, pk_write_ec_pubkey( &c, buf, ec ) ); |
| |
| if( c - buf < 1 ) |
| return( POLARSSL_ERR_ASN1_BUF_TOO_SMALL ); |
| *--c = 0; |
| pub_len += 1; |
| |
| ASN1_CHK_ADD( pub_len, asn1_write_len( &c, buf, pub_len ) ); |
| ASN1_CHK_ADD( pub_len, asn1_write_tag( &c, buf, ASN1_BIT_STRING ) ); |
| |
| ASN1_CHK_ADD( pub_len, asn1_write_len( &c, buf, pub_len ) ); |
| ASN1_CHK_ADD( pub_len, asn1_write_tag( &c, buf, |
| ASN1_CONTEXT_SPECIFIC | ASN1_CONSTRUCTED | 1 ) ); |
| len += pub_len; |
| |
| /* parameters */ |
| ASN1_CHK_ADD( par_len, pk_write_ec_param( &c, buf, ec ) ); |
| |
| ASN1_CHK_ADD( par_len, asn1_write_len( &c, buf, par_len ) ); |
| ASN1_CHK_ADD( par_len, asn1_write_tag( &c, buf, |
| ASN1_CONTEXT_SPECIFIC | ASN1_CONSTRUCTED | 0 ) ); |
| len += par_len; |
| |
| /* privateKey: write as MPI then fix tag */ |
| ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &ec->d ) ); |
| *c = ASN1_OCTET_STRING; |
| |
| /* version */ |
| ASN1_CHK_ADD( len, asn1_write_int( &c, buf, 1 ) ); |
| |
| ASN1_CHK_ADD( len, asn1_write_len( &c, buf, len ) ); |
| ASN1_CHK_ADD( len, asn1_write_tag( &c, buf, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ); |
| } |
| else |
| #endif |
| return( POLARSSL_ERR_PK_FEATURE_UNAVAILABLE ); |
| |
| return( (int) len ); |
| } |
| |
| #if defined(POLARSSL_PEM_WRITE_C) |
| |
| #define PEM_BEGIN_PUBLIC_KEY "-----BEGIN PUBLIC KEY-----\n" |
| #define PEM_END_PUBLIC_KEY "-----END PUBLIC KEY-----\n" |
| |
| #define PEM_BEGIN_PRIVATE_KEY_RSA "-----BEGIN RSA PRIVATE KEY-----\n" |
| #define PEM_END_PRIVATE_KEY_RSA "-----END RSA PRIVATE KEY-----\n" |
| #define PEM_BEGIN_PRIVATE_KEY_EC "-----BEGIN EC PRIVATE KEY-----\n" |
| #define PEM_END_PRIVATE_KEY_EC "-----END EC PRIVATE KEY-----\n" |
| |
| int pk_write_pubkey_pem( pk_context *key, unsigned char *buf, size_t size ) |
| { |
| int ret; |
| unsigned char output_buf[4096]; |
| size_t olen = 0; |
| |
| if( ( ret = pk_write_pubkey_der( key, output_buf, |
| sizeof(output_buf) ) ) < 0 ) |
| { |
| return( ret ); |
| } |
| |
| if( ( ret = pem_write_buffer( PEM_BEGIN_PUBLIC_KEY, PEM_END_PUBLIC_KEY, |
| output_buf + sizeof(output_buf) - ret, |
| ret, buf, size, &olen ) ) != 0 ) |
| { |
| return( ret ); |
| } |
| |
| return( 0 ); |
| } |
| |
| int pk_write_key_pem( pk_context *key, unsigned char *buf, size_t size ) |
| { |
| int ret; |
| unsigned char output_buf[4096]; |
| const char *begin, *end; |
| size_t olen = 0; |
| |
| if( ( ret = pk_write_key_der( key, output_buf, sizeof(output_buf) ) ) < 0 ) |
| return( ret ); |
| |
| #if defined(POLARSSL_RSA_C) |
| if( pk_get_type( key ) == POLARSSL_PK_RSA ) |
| { |
| begin = PEM_BEGIN_PRIVATE_KEY_RSA; |
| end = PEM_END_PRIVATE_KEY_RSA; |
| } |
| else |
| #endif |
| #if defined(POLARSSL_ECP_C) |
| if( pk_get_type( key ) == POLARSSL_PK_ECKEY ) |
| { |
| begin = PEM_BEGIN_PRIVATE_KEY_EC; |
| end = PEM_END_PRIVATE_KEY_EC; |
| } |
| else |
| #endif |
| return( POLARSSL_ERR_PK_FEATURE_UNAVAILABLE ); |
| |
| if( ( ret = pem_write_buffer( begin, end, |
| output_buf + sizeof(output_buf) - ret, |
| ret, buf, size, &olen ) ) != 0 ) |
| { |
| return( ret ); |
| } |
| |
| return( 0 ); |
| } |
| #endif /* POLARSSL_PEM_WRITE_C */ |
| |
| #endif /* POLARSSL_PK_WRITE_C */ |
