967 lines
26 KiB
C
967 lines
26 KiB
C
/*
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* Public Key layer for parsing key files and structures
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*
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* Copyright (C) 2006-2013, Brainspark B.V.
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*
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* This file is part of PolarSSL (http://www.polarssl.org)
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* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "polarssl/config.h"
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#if defined(POLARSSL_PK_PARSE_C)
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#include "polarssl/pk.h"
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#include "polarssl/asn1.h"
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#include "polarssl/oid.h"
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#if defined(POLARSSL_RSA_C)
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#include "polarssl/rsa.h"
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#endif
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#if defined(POLARSSL_ECP_C)
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#include "polarssl/ecp.h"
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#endif
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#if defined(POLARSSL_ECDSA_C)
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#include "polarssl/ecdsa.h"
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#endif
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#if defined(POLARSSL_PEM_PARSE_C)
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#include "polarssl/pem.h"
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#endif
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#if defined(POLARSSL_PKCS5_C)
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#include "polarssl/pkcs5.h"
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#endif
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#if defined(POLARSSL_PKCS12_C)
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#include "polarssl/pkcs12.h"
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#endif
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#if defined(POLARSSL_PLATFORM_C)
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#include "polarssl/platform.h"
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#else
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#include <stdlib.h>
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#define polarssl_malloc malloc
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#define polarssl_free free
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#endif
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#if defined(POLARSSL_FS_IO)
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/*
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* Load all data from a file into a given buffer.
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*/
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static int load_file( const char *path, unsigned char **buf, size_t *n )
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{
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FILE *f;
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long size;
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if( ( f = fopen( path, "rb" ) ) == NULL )
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return( POLARSSL_ERR_PK_FILE_IO_ERROR );
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fseek( f, 0, SEEK_END );
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if( ( size = ftell( f ) ) == -1 )
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{
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fclose( f );
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return( POLARSSL_ERR_PK_FILE_IO_ERROR );
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}
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fseek( f, 0, SEEK_SET );
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*n = (size_t) size;
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if( *n + 1 == 0 ||
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( *buf = (unsigned char *) polarssl_malloc( *n + 1 ) ) == NULL )
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{
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fclose( f );
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return( POLARSSL_ERR_PK_MALLOC_FAILED );
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}
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if( fread( *buf, 1, *n, f ) != *n )
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{
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fclose( f );
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polarssl_free( *buf );
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return( POLARSSL_ERR_PK_FILE_IO_ERROR );
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}
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fclose( f );
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(*buf)[*n] = '\0';
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return( 0 );
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}
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/*
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* Load and parse a private key
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*/
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int pk_parse_keyfile( pk_context *ctx,
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const char *path, const char *pwd )
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{
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int ret;
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size_t n;
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unsigned char *buf;
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if ( (ret = load_file( path, &buf, &n ) ) != 0 )
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return( ret );
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if( pwd == NULL )
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ret = pk_parse_key( ctx, buf, n, NULL, 0 );
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else
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ret = pk_parse_key( ctx, buf, n,
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(const unsigned char *) pwd, strlen( pwd ) );
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memset( buf, 0, n + 1 );
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polarssl_free( buf );
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return( ret );
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}
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/*
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* Load and parse a public key
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*/
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int pk_parse_public_keyfile( pk_context *ctx, const char *path )
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{
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int ret;
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size_t n;
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unsigned char *buf;
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if ( (ret = load_file( path, &buf, &n ) ) != 0 )
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return( ret );
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ret = pk_parse_public_key( ctx, buf, n );
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memset( buf, 0, n + 1 );
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polarssl_free( buf );
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return( ret );
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}
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#endif /* POLARSSL_FS_IO */
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#if defined(POLARSSL_ECP_C)
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/* Get an EC group id from an ECParameters buffer
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*
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* ECParameters ::= CHOICE {
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* namedCurve OBJECT IDENTIFIER
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* -- implicitCurve NULL
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* -- specifiedCurve SpecifiedECDomain
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* }
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*/
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static int pk_get_ecparams( unsigned char **p, const unsigned char *end,
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asn1_buf *params )
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{
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int ret;
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params->tag = **p;
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if( ( ret = asn1_get_tag( p, end, ¶ms->len, ASN1_OID ) ) != 0 )
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return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
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params->p = *p;
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*p += params->len;
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if( *p != end )
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return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT +
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POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
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return( 0 );
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}
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/*
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* Use EC parameters to initialise an EC group
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*/
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static int pk_use_ecparams( const asn1_buf *params, ecp_group *grp )
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{
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int ret;
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ecp_group_id grp_id;
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if( oid_get_ec_grp( params, &grp_id ) != 0 )
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return( POLARSSL_ERR_PK_UNKNOWN_NAMED_CURVE );
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/*
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* grp may already be initilialized; if so, make sure IDs match
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*/
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if( grp->id != POLARSSL_ECP_DP_NONE && grp->id != grp_id )
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return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT );
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if( ( ret = ecp_use_known_dp( grp, grp_id ) ) != 0 )
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return( ret );
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return( 0 );
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}
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/*
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* EC public key is an EC point
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*/
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static int pk_get_ecpubkey( unsigned char **p, const unsigned char *end,
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ecp_keypair *key )
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{
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int ret;
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if( ( ret = ecp_point_read_binary( &key->grp, &key->Q,
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(const unsigned char *) *p, end - *p ) ) != 0 ||
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( ret = ecp_check_pubkey( &key->grp, &key->Q ) ) != 0 )
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{
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ecp_keypair_free( key );
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return( POLARSSL_ERR_PK_INVALID_PUBKEY );
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}
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/*
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* We know ecp_point_read_binary consumed all bytes
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*/
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*p = (unsigned char *) end;
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return( 0 );
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}
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#endif /* POLARSSL_ECP_C */
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#if defined(POLARSSL_RSA_C)
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/*
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* RSAPublicKey ::= SEQUENCE {
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* modulus INTEGER, -- n
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* publicExponent INTEGER -- e
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* }
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*/
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static int pk_get_rsapubkey( unsigned char **p,
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const unsigned char *end,
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rsa_context *rsa )
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{
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int ret;
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size_t len;
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if( ( ret = asn1_get_tag( p, end, &len,
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ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
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return( POLARSSL_ERR_PK_INVALID_PUBKEY + ret );
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if( *p + len != end )
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return( POLARSSL_ERR_PK_INVALID_PUBKEY +
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POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
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if( ( ret = asn1_get_mpi( p, end, &rsa->N ) ) != 0 ||
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( ret = asn1_get_mpi( p, end, &rsa->E ) ) != 0 )
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return( POLARSSL_ERR_PK_INVALID_PUBKEY + ret );
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if( *p != end )
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return( POLARSSL_ERR_PK_INVALID_PUBKEY +
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POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
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if( ( ret = rsa_check_pubkey( rsa ) ) != 0 )
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return( POLARSSL_ERR_PK_INVALID_PUBKEY );
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rsa->len = mpi_size( &rsa->N );
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return( 0 );
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}
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#endif /* POLARSSL_RSA_C */
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/* Get a PK algorithm identifier
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*
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* AlgorithmIdentifier ::= SEQUENCE {
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* algorithm OBJECT IDENTIFIER,
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* parameters ANY DEFINED BY algorithm OPTIONAL }
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*/
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static int pk_get_pk_alg( unsigned char **p,
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const unsigned char *end,
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pk_type_t *pk_alg, asn1_buf *params )
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{
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int ret;
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asn1_buf alg_oid;
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memset( params, 0, sizeof(asn1_buf) );
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if( ( ret = asn1_get_alg( p, end, &alg_oid, params ) ) != 0 )
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return( POLARSSL_ERR_PK_INVALID_ALG + ret );
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if( oid_get_pk_alg( &alg_oid, pk_alg ) != 0 )
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return( POLARSSL_ERR_PK_UNKNOWN_PK_ALG );
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/*
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* No parameters with RSA (only for EC)
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*/
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if( *pk_alg == POLARSSL_PK_RSA &&
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( ( params->tag != ASN1_NULL && params->tag != 0 ) ||
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params->len != 0 ) )
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{
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return( POLARSSL_ERR_PK_INVALID_ALG );
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}
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return( 0 );
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}
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/*
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* SubjectPublicKeyInfo ::= SEQUENCE {
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* algorithm AlgorithmIdentifier,
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* subjectPublicKey BIT STRING }
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*/
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int pk_parse_subpubkey( unsigned char **p, const unsigned char *end,
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pk_context *pk )
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{
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int ret;
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size_t len;
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asn1_buf alg_params;
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pk_type_t pk_alg = POLARSSL_PK_NONE;
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const pk_info_t *pk_info;
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if( ( ret = asn1_get_tag( p, end, &len,
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ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
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{
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return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
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}
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end = *p + len;
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if( ( ret = pk_get_pk_alg( p, end, &pk_alg, &alg_params ) ) != 0 )
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return( ret );
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if( ( ret = asn1_get_bitstring_null( p, end, &len ) ) != 0 )
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return( POLARSSL_ERR_PK_INVALID_PUBKEY + ret );
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if( *p + len != end )
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return( POLARSSL_ERR_PK_INVALID_PUBKEY +
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POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
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if( ( pk_info = pk_info_from_type( pk_alg ) ) == NULL )
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return( POLARSSL_ERR_PK_UNKNOWN_PK_ALG );
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if( ( ret = pk_init_ctx( pk, pk_info ) ) != 0 )
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return( ret );
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#if defined(POLARSSL_RSA_C)
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if( pk_alg == POLARSSL_PK_RSA )
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{
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ret = pk_get_rsapubkey( p, end, pk_rsa( *pk ) );
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} else
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#endif /* POLARSSL_RSA_C */
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#if defined(POLARSSL_ECP_C)
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if( pk_alg == POLARSSL_PK_ECKEY_DH || pk_alg == POLARSSL_PK_ECKEY )
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{
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ret = pk_use_ecparams( &alg_params, &pk_ec( *pk )->grp );
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if( ret == 0 )
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ret = pk_get_ecpubkey( p, end, pk_ec( *pk ) );
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} else
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#endif /* POLARSSL_ECP_C */
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ret = POLARSSL_ERR_PK_UNKNOWN_PK_ALG;
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if( ret == 0 && *p != end )
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ret = POLARSSL_ERR_PK_INVALID_PUBKEY
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POLARSSL_ERR_ASN1_LENGTH_MISMATCH;
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if( ret != 0 )
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pk_free( pk );
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return( ret );
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}
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#if defined(POLARSSL_RSA_C)
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/*
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* Parse a PKCS#1 encoded private RSA key
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*/
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static int pk_parse_key_pkcs1_der( rsa_context *rsa,
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const unsigned char *key,
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size_t keylen )
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{
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int ret;
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size_t len;
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unsigned char *p, *end;
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p = (unsigned char *) key;
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end = p + keylen;
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/*
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* This function parses the RSAPrivateKey (PKCS#1)
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*
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* RSAPrivateKey ::= SEQUENCE {
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* version Version,
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* modulus INTEGER, -- n
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* publicExponent INTEGER, -- e
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* privateExponent INTEGER, -- d
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* prime1 INTEGER, -- p
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* prime2 INTEGER, -- q
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* exponent1 INTEGER, -- d mod (p-1)
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* exponent2 INTEGER, -- d mod (q-1)
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* coefficient INTEGER, -- (inverse of q) mod p
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* otherPrimeInfos OtherPrimeInfos OPTIONAL
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* }
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*/
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if( ( ret = asn1_get_tag( &p, end, &len,
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ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
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{
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return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
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}
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end = p + len;
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if( ( ret = asn1_get_int( &p, end, &rsa->ver ) ) != 0 )
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{
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return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
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}
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if( rsa->ver != 0 )
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{
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return( POLARSSL_ERR_PK_KEY_INVALID_VERSION );
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}
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if( ( ret = asn1_get_mpi( &p, end, &rsa->N ) ) != 0 ||
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( ret = asn1_get_mpi( &p, end, &rsa->E ) ) != 0 ||
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( ret = asn1_get_mpi( &p, end, &rsa->D ) ) != 0 ||
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( ret = asn1_get_mpi( &p, end, &rsa->P ) ) != 0 ||
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( ret = asn1_get_mpi( &p, end, &rsa->Q ) ) != 0 ||
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( ret = asn1_get_mpi( &p, end, &rsa->DP ) ) != 0 ||
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( ret = asn1_get_mpi( &p, end, &rsa->DQ ) ) != 0 ||
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( ret = asn1_get_mpi( &p, end, &rsa->QP ) ) != 0 )
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{
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rsa_free( rsa );
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return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
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}
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rsa->len = mpi_size( &rsa->N );
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if( p != end )
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{
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rsa_free( rsa );
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return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT +
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POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
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}
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if( ( ret = rsa_check_privkey( rsa ) ) != 0 )
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{
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rsa_free( rsa );
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return( ret );
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}
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return( 0 );
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}
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#endif /* POLARSSL_RSA_C */
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#if defined(POLARSSL_ECP_C)
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/*
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* Parse a SEC1 encoded private EC key
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*/
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static int pk_parse_key_sec1_der( ecp_keypair *eck,
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const unsigned char *key,
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size_t keylen )
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{
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int ret;
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int version;
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size_t len;
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asn1_buf params;
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unsigned char *p = (unsigned char *) key;
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unsigned char *end = p + keylen;
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unsigned char *end2;
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/*
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* RFC 5915, or SEC1 Appendix C.4
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*
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* ECPrivateKey ::= SEQUENCE {
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* version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1),
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* privateKey OCTET STRING,
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* parameters [0] ECParameters {{ NamedCurve }} OPTIONAL,
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* publicKey [1] BIT STRING OPTIONAL
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* }
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*/
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if( ( ret = asn1_get_tag( &p, end, &len,
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ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
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{
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return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
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}
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end = p + len;
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if( ( ret = asn1_get_int( &p, end, &version ) ) != 0 )
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return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
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if( version != 1 )
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return( POLARSSL_ERR_PK_KEY_INVALID_VERSION );
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if( ( ret = asn1_get_tag( &p, end, &len, ASN1_OCTET_STRING ) ) != 0 )
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return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
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if( ( ret = mpi_read_binary( &eck->d, p, len ) ) != 0 )
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{
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ecp_keypair_free( eck );
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return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
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}
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p += len;
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/*
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* Is 'parameters' present?
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*/
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if( ( ret = asn1_get_tag( &p, end, &len,
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ASN1_CONTEXT_SPECIFIC | ASN1_CONSTRUCTED | 0 ) ) == 0 )
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{
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if( ( ret = pk_get_ecparams( &p, p + len, ¶ms) ) != 0 ||
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( ret = pk_use_ecparams( ¶ms, &eck->grp ) ) != 0 )
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{
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ecp_keypair_free( eck );
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return( ret );
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}
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}
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else if( ret != POLARSSL_ERR_ASN1_UNEXPECTED_TAG )
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{
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ecp_keypair_free( eck );
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return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
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}
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/*
|
|
* Is 'publickey' present? If not, create it from the private key.
|
|
*/
|
|
if( ( ret = asn1_get_tag( &p, end, &len,
|
|
ASN1_CONTEXT_SPECIFIC | ASN1_CONSTRUCTED | 1 ) ) == 0 )
|
|
{
|
|
end2 = p + len;
|
|
|
|
if( ( ret = asn1_get_bitstring_null( &p, end2, &len ) ) != 0 )
|
|
return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
|
|
|
|
if( p + len != end2 )
|
|
return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT +
|
|
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
|
|
|
|
if( ( ret = pk_get_ecpubkey( &p, end2, eck ) ) != 0 )
|
|
return( ret );
|
|
}
|
|
else if ( ret != POLARSSL_ERR_ASN1_UNEXPECTED_TAG )
|
|
{
|
|
ecp_keypair_free( eck );
|
|
return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
|
|
}
|
|
else if( ( ret = ecp_mul( &eck->grp, &eck->Q, &eck->d, &eck->grp.G,
|
|
NULL, NULL ) ) != 0 )
|
|
{
|
|
ecp_keypair_free( eck );
|
|
return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
|
|
}
|
|
|
|
if( ( ret = ecp_check_privkey( &eck->grp, &eck->d ) ) != 0 )
|
|
{
|
|
ecp_keypair_free( eck );
|
|
return( ret );
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif /* POLARSSL_ECP_C */
|
|
|
|
/*
|
|
* Parse an unencrypted PKCS#8 encoded private key
|
|
*/
|
|
static int pk_parse_key_pkcs8_unencrypted_der(
|
|
pk_context *pk,
|
|
const unsigned char* key,
|
|
size_t keylen )
|
|
{
|
|
int ret, version;
|
|
size_t len;
|
|
asn1_buf params;
|
|
unsigned char *p = (unsigned char *) key;
|
|
unsigned char *end = p + keylen;
|
|
pk_type_t pk_alg = POLARSSL_PK_NONE;
|
|
const pk_info_t *pk_info;
|
|
|
|
/*
|
|
* This function parses the PrivatKeyInfo object (PKCS#8 v1.2 = RFC 5208)
|
|
*
|
|
* PrivateKeyInfo ::= SEQUENCE {
|
|
* version Version,
|
|
* privateKeyAlgorithm PrivateKeyAlgorithmIdentifier,
|
|
* privateKey PrivateKey,
|
|
* attributes [0] IMPLICIT Attributes OPTIONAL }
|
|
*
|
|
* Version ::= INTEGER
|
|
* PrivateKeyAlgorithmIdentifier ::= AlgorithmIdentifier
|
|
* PrivateKey ::= OCTET STRING
|
|
*
|
|
* The PrivateKey OCTET STRING is a SEC1 ECPrivateKey
|
|
*/
|
|
|
|
if( ( ret = asn1_get_tag( &p, end, &len,
|
|
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
|
|
{
|
|
return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
|
|
}
|
|
|
|
end = p + len;
|
|
|
|
if( ( ret = asn1_get_int( &p, end, &version ) ) != 0 )
|
|
return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
|
|
|
|
if( version != 0 )
|
|
return( POLARSSL_ERR_PK_KEY_INVALID_VERSION + ret );
|
|
|
|
if( ( ret = pk_get_pk_alg( &p, end, &pk_alg, ¶ms ) ) != 0 )
|
|
return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
|
|
|
|
if( ( ret = asn1_get_tag( &p, end, &len, ASN1_OCTET_STRING ) ) != 0 )
|
|
return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
|
|
|
|
if( len < 1 )
|
|
return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT +
|
|
POLARSSL_ERR_ASN1_OUT_OF_DATA );
|
|
|
|
if( ( pk_info = pk_info_from_type( pk_alg ) ) == NULL )
|
|
return( POLARSSL_ERR_PK_UNKNOWN_PK_ALG );
|
|
|
|
if( ( ret = pk_init_ctx( pk, pk_info ) ) != 0 )
|
|
return( ret );
|
|
|
|
#if defined(POLARSSL_RSA_C)
|
|
if( pk_alg == POLARSSL_PK_RSA )
|
|
{
|
|
if( ( ret = pk_parse_key_pkcs1_der( pk_rsa( *pk ), p, len ) ) != 0 )
|
|
{
|
|
pk_free( pk );
|
|
return( ret );
|
|
}
|
|
} else
|
|
#endif /* POLARSSL_RSA_C */
|
|
#if defined(POLARSSL_ECP_C)
|
|
if( pk_alg == POLARSSL_PK_ECKEY || pk_alg == POLARSSL_PK_ECKEY_DH )
|
|
{
|
|
if( ( ret = pk_use_ecparams( ¶ms, &pk_ec( *pk )->grp ) ) != 0 ||
|
|
( ret = pk_parse_key_sec1_der( pk_ec( *pk ), p, len ) ) != 0 )
|
|
{
|
|
pk_free( pk );
|
|
return( ret );
|
|
}
|
|
} else
|
|
#endif /* POLARSSL_ECP_C */
|
|
return( POLARSSL_ERR_PK_UNKNOWN_PK_ALG );
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Parse an encrypted PKCS#8 encoded private key
|
|
*/
|
|
static int pk_parse_key_pkcs8_encrypted_der(
|
|
pk_context *pk,
|
|
const unsigned char *key, size_t keylen,
|
|
const unsigned char *pwd, size_t pwdlen )
|
|
{
|
|
int ret;
|
|
size_t len;
|
|
unsigned char buf[2048];
|
|
unsigned char *p, *end;
|
|
asn1_buf pbe_alg_oid, pbe_params;
|
|
#if defined(POLARSSL_PKCS12_C)
|
|
cipher_type_t cipher_alg;
|
|
md_type_t md_alg;
|
|
#endif
|
|
|
|
memset( buf, 0, sizeof( buf ) );
|
|
|
|
p = (unsigned char *) key;
|
|
end = p + keylen;
|
|
|
|
if( pwdlen == 0 )
|
|
return( POLARSSL_ERR_PK_PASSWORD_REQUIRED );
|
|
|
|
/*
|
|
* This function parses the EncryptedPrivatKeyInfo object (PKCS#8)
|
|
*
|
|
* EncryptedPrivateKeyInfo ::= SEQUENCE {
|
|
* encryptionAlgorithm EncryptionAlgorithmIdentifier,
|
|
* encryptedData EncryptedData
|
|
* }
|
|
*
|
|
* EncryptionAlgorithmIdentifier ::= AlgorithmIdentifier
|
|
*
|
|
* EncryptedData ::= OCTET STRING
|
|
*
|
|
* The EncryptedData OCTET STRING is a PKCS#8 PrivateKeyInfo
|
|
*/
|
|
if( ( ret = asn1_get_tag( &p, end, &len,
|
|
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
|
|
{
|
|
return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
|
|
}
|
|
|
|
end = p + len;
|
|
|
|
if( ( ret = asn1_get_alg( &p, end, &pbe_alg_oid, &pbe_params ) ) != 0 )
|
|
return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
|
|
|
|
if( ( ret = asn1_get_tag( &p, end, &len, ASN1_OCTET_STRING ) ) != 0 )
|
|
return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
|
|
|
|
if( len > sizeof( buf ) )
|
|
return( POLARSSL_ERR_PK_BAD_INPUT_DATA );
|
|
|
|
/*
|
|
* Decrypt EncryptedData with appropriate PDE
|
|
*/
|
|
#if defined(POLARSSL_PKCS12_C)
|
|
if( oid_get_pkcs12_pbe_alg( &pbe_alg_oid, &md_alg, &cipher_alg ) == 0 )
|
|
{
|
|
if( ( ret = pkcs12_pbe( &pbe_params, PKCS12_PBE_DECRYPT,
|
|
cipher_alg, md_alg,
|
|
pwd, pwdlen, p, len, buf ) ) != 0 )
|
|
{
|
|
if( ret == POLARSSL_ERR_PKCS12_PASSWORD_MISMATCH )
|
|
return( POLARSSL_ERR_PK_PASSWORD_MISMATCH );
|
|
|
|
return( ret );
|
|
}
|
|
}
|
|
else if( OID_CMP( OID_PKCS12_PBE_SHA1_RC4_128, &pbe_alg_oid ) )
|
|
{
|
|
if( ( ret = pkcs12_pbe_sha1_rc4_128( &pbe_params,
|
|
PKCS12_PBE_DECRYPT,
|
|
pwd, pwdlen,
|
|
p, len, buf ) ) != 0 )
|
|
{
|
|
return( ret );
|
|
}
|
|
|
|
// Best guess for password mismatch when using RC4. If first tag is
|
|
// not ASN1_CONSTRUCTED | ASN1_SEQUENCE
|
|
//
|
|
if( *buf != ( ASN1_CONSTRUCTED | ASN1_SEQUENCE ) )
|
|
return( POLARSSL_ERR_PK_PASSWORD_MISMATCH );
|
|
}
|
|
else
|
|
#endif /* POLARSSL_PKCS12_C */
|
|
#if defined(POLARSSL_PKCS5_C)
|
|
if( OID_CMP( OID_PKCS5_PBES2, &pbe_alg_oid ) )
|
|
{
|
|
if( ( ret = pkcs5_pbes2( &pbe_params, PKCS5_DECRYPT, pwd, pwdlen,
|
|
p, len, buf ) ) != 0 )
|
|
{
|
|
if( ret == POLARSSL_ERR_PKCS5_PASSWORD_MISMATCH )
|
|
return( POLARSSL_ERR_PK_PASSWORD_MISMATCH );
|
|
|
|
return( ret );
|
|
}
|
|
}
|
|
else
|
|
#endif /* POLARSSL_PKCS5_C */
|
|
{
|
|
((void) pwd);
|
|
return( POLARSSL_ERR_PK_FEATURE_UNAVAILABLE );
|
|
}
|
|
|
|
return( pk_parse_key_pkcs8_unencrypted_der( pk, buf, len ) );
|
|
}
|
|
|
|
/*
|
|
* Parse a private key
|
|
*/
|
|
int pk_parse_key( pk_context *pk,
|
|
const unsigned char *key, size_t keylen,
|
|
const unsigned char *pwd, size_t pwdlen )
|
|
{
|
|
int ret;
|
|
const pk_info_t *pk_info;
|
|
|
|
#if defined(POLARSSL_PEM_PARSE_C)
|
|
size_t len;
|
|
pem_context pem;
|
|
|
|
pem_init( &pem );
|
|
|
|
#if defined(POLARSSL_RSA_C)
|
|
ret = pem_read_buffer( &pem,
|
|
"-----BEGIN RSA PRIVATE KEY-----",
|
|
"-----END RSA PRIVATE KEY-----",
|
|
key, pwd, pwdlen, &len );
|
|
if( ret == 0 )
|
|
{
|
|
if( ( pk_info = pk_info_from_type( POLARSSL_PK_RSA ) ) == NULL )
|
|
return( POLARSSL_ERR_PK_UNKNOWN_PK_ALG );
|
|
|
|
if( ( ret = pk_init_ctx( pk, pk_info ) ) != 0 ||
|
|
( ret = pk_parse_key_pkcs1_der( pk_rsa( *pk ),
|
|
pem.buf, pem.buflen ) ) != 0 )
|
|
{
|
|
pk_free( pk );
|
|
}
|
|
|
|
pem_free( &pem );
|
|
return( ret );
|
|
}
|
|
else if( ret == POLARSSL_ERR_PEM_PASSWORD_MISMATCH )
|
|
return( POLARSSL_ERR_PK_PASSWORD_MISMATCH );
|
|
else if( ret == POLARSSL_ERR_PEM_PASSWORD_REQUIRED )
|
|
return( POLARSSL_ERR_PK_PASSWORD_REQUIRED );
|
|
else if( ret != POLARSSL_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
|
|
return( ret );
|
|
#endif /* POLARSSL_RSA_C */
|
|
|
|
#if defined(POLARSSL_ECP_C)
|
|
ret = pem_read_buffer( &pem,
|
|
"-----BEGIN EC PRIVATE KEY-----",
|
|
"-----END EC PRIVATE KEY-----",
|
|
key, pwd, pwdlen, &len );
|
|
if( ret == 0 )
|
|
{
|
|
if( ( pk_info = pk_info_from_type( POLARSSL_PK_ECKEY ) ) == NULL )
|
|
return( POLARSSL_ERR_PK_UNKNOWN_PK_ALG );
|
|
|
|
if( ( ret = pk_init_ctx( pk, pk_info ) ) != 0 ||
|
|
( ret = pk_parse_key_sec1_der( pk_ec( *pk ),
|
|
pem.buf, pem.buflen ) ) != 0 )
|
|
{
|
|
pk_free( pk );
|
|
}
|
|
|
|
pem_free( &pem );
|
|
return( ret );
|
|
}
|
|
else if( ret == POLARSSL_ERR_PEM_PASSWORD_MISMATCH )
|
|
return( POLARSSL_ERR_PK_PASSWORD_MISMATCH );
|
|
else if( ret == POLARSSL_ERR_PEM_PASSWORD_REQUIRED )
|
|
return( POLARSSL_ERR_PK_PASSWORD_REQUIRED );
|
|
else if( ret != POLARSSL_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
|
|
return( ret );
|
|
#endif /* POLARSSL_ECP_C */
|
|
|
|
ret = pem_read_buffer( &pem,
|
|
"-----BEGIN PRIVATE KEY-----",
|
|
"-----END PRIVATE KEY-----",
|
|
key, NULL, 0, &len );
|
|
if( ret == 0 )
|
|
{
|
|
if( ( ret = pk_parse_key_pkcs8_unencrypted_der( pk,
|
|
pem.buf, pem.buflen ) ) != 0 )
|
|
{
|
|
pk_free( pk );
|
|
}
|
|
|
|
pem_free( &pem );
|
|
return( ret );
|
|
}
|
|
else if( ret != POLARSSL_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
|
|
return( ret );
|
|
|
|
ret = pem_read_buffer( &pem,
|
|
"-----BEGIN ENCRYPTED PRIVATE KEY-----",
|
|
"-----END ENCRYPTED PRIVATE KEY-----",
|
|
key, NULL, 0, &len );
|
|
if( ret == 0 )
|
|
{
|
|
if( ( ret = pk_parse_key_pkcs8_encrypted_der( pk,
|
|
pem.buf, pem.buflen,
|
|
pwd, pwdlen ) ) != 0 )
|
|
{
|
|
pk_free( pk );
|
|
}
|
|
|
|
pem_free( &pem );
|
|
return( ret );
|
|
}
|
|
else if( ret != POLARSSL_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
|
|
return( ret );
|
|
#else
|
|
((void) pwd);
|
|
((void) pwdlen);
|
|
#endif /* POLARSSL_PEM_PARSE_C */
|
|
|
|
/*
|
|
* At this point we only know it's not a PEM formatted key. Could be any
|
|
* of the known DER encoded private key formats
|
|
*
|
|
* We try the different DER format parsers to see if one passes without
|
|
* error
|
|
*/
|
|
if( ( ret = pk_parse_key_pkcs8_encrypted_der( pk, key, keylen,
|
|
pwd, pwdlen ) ) == 0 )
|
|
{
|
|
return( 0 );
|
|
}
|
|
|
|
pk_free( pk );
|
|
|
|
if( ret == POLARSSL_ERR_PK_PASSWORD_MISMATCH )
|
|
{
|
|
return( ret );
|
|
}
|
|
|
|
if( ( ret = pk_parse_key_pkcs8_unencrypted_der( pk, key, keylen ) ) == 0 )
|
|
return( 0 );
|
|
|
|
pk_free( pk );
|
|
|
|
#if defined(POLARSSL_RSA_C)
|
|
if( ( pk_info = pk_info_from_type( POLARSSL_PK_RSA ) ) == NULL )
|
|
return( POLARSSL_ERR_PK_UNKNOWN_PK_ALG );
|
|
|
|
if( ( ret = pk_init_ctx( pk, pk_info ) ) != 0 ||
|
|
( ret = pk_parse_key_pkcs1_der( pk_rsa( *pk ), key, keylen ) ) == 0 )
|
|
{
|
|
return( 0 );
|
|
}
|
|
|
|
pk_free( pk );
|
|
#endif /* POLARSSL_RSA_C */
|
|
|
|
#if defined(POLARSSL_ECP_C)
|
|
if( ( pk_info = pk_info_from_type( POLARSSL_PK_ECKEY ) ) == NULL )
|
|
return( POLARSSL_ERR_PK_UNKNOWN_PK_ALG );
|
|
|
|
if( ( ret = pk_init_ctx( pk, pk_info ) ) != 0 ||
|
|
( ret = pk_parse_key_sec1_der( pk_ec( *pk ), key, keylen ) ) == 0 )
|
|
{
|
|
return( 0 );
|
|
}
|
|
|
|
pk_free( pk );
|
|
#endif /* POLARSSL_ECP_C */
|
|
|
|
return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT );
|
|
}
|
|
|
|
/*
|
|
* Parse a public key
|
|
*/
|
|
int pk_parse_public_key( pk_context *ctx,
|
|
const unsigned char *key, size_t keylen )
|
|
{
|
|
int ret;
|
|
unsigned char *p;
|
|
#if defined(POLARSSL_PEM_PARSE_C)
|
|
size_t len;
|
|
pem_context pem;
|
|
|
|
pem_init( &pem );
|
|
ret = pem_read_buffer( &pem,
|
|
"-----BEGIN PUBLIC KEY-----",
|
|
"-----END PUBLIC KEY-----",
|
|
key, NULL, 0, &len );
|
|
|
|
if( ret == 0 )
|
|
{
|
|
/*
|
|
* Was PEM encoded
|
|
*/
|
|
key = pem.buf;
|
|
keylen = pem.buflen;
|
|
}
|
|
else if( ret != POLARSSL_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
|
|
{
|
|
pem_free( &pem );
|
|
return( ret );
|
|
}
|
|
#endif
|
|
p = (unsigned char *) key;
|
|
|
|
ret = pk_parse_subpubkey( &p, p + keylen, ctx );
|
|
|
|
#if defined(POLARSSL_PEM_PARSE_C)
|
|
pem_free( &pem );
|
|
#endif
|
|
|
|
return( ret );
|
|
}
|
|
|
|
#endif /* POLARSSL_PK_PARSE_C */
|