mirror of
https://github.com/yuzu-emu/mbedtls
synced 2024-11-24 19:28:14 +00:00
396 lines
9 KiB
C
396 lines
9 KiB
C
/*
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* Generic ASN.1 parsing
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*
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* Copyright (C) 2006-2014, ARM Limited, All Rights Reserved
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*
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* This file is part of mbed TLS (https://polarssl.org)
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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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#if !defined(POLARSSL_CONFIG_FILE)
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#include "polarssl/config.h"
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#else
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#include POLARSSL_CONFIG_FILE
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#endif
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#if defined(POLARSSL_ASN1_PARSE_C)
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#include "polarssl/asn1.h"
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#include <string.h>
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#if defined(POLARSSL_BIGNUM_C)
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#include "polarssl/bignum.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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/* Implementation that should never be optimized out by the compiler */
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static void polarssl_zeroize( void *v, size_t n ) {
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volatile unsigned char *p = v; while( n-- ) *p++ = 0;
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}
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/*
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* ASN.1 DER decoding routines
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*/
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int asn1_get_len( unsigned char **p,
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const unsigned char *end,
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size_t *len )
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{
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if( ( end - *p ) < 1 )
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return( POLARSSL_ERR_ASN1_OUT_OF_DATA );
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if( ( **p & 0x80 ) == 0 )
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*len = *(*p)++;
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else
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{
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switch( **p & 0x7F )
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{
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case 1:
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if( ( end - *p ) < 2 )
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return( POLARSSL_ERR_ASN1_OUT_OF_DATA );
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*len = (*p)[1];
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(*p) += 2;
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break;
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case 2:
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if( ( end - *p ) < 3 )
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return( POLARSSL_ERR_ASN1_OUT_OF_DATA );
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*len = ( (size_t)(*p)[1] << 8 ) | (*p)[2];
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(*p) += 3;
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break;
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case 3:
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if( ( end - *p ) < 4 )
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return( POLARSSL_ERR_ASN1_OUT_OF_DATA );
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*len = ( (size_t)(*p)[1] << 16 ) |
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( (size_t)(*p)[2] << 8 ) | (*p)[3];
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(*p) += 4;
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break;
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case 4:
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if( ( end - *p ) < 5 )
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return( POLARSSL_ERR_ASN1_OUT_OF_DATA );
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*len = ( (size_t)(*p)[1] << 24 ) | ( (size_t)(*p)[2] << 16 ) |
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( (size_t)(*p)[3] << 8 ) | (*p)[4];
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(*p) += 5;
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break;
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default:
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return( POLARSSL_ERR_ASN1_INVALID_LENGTH );
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}
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}
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if( *len > (size_t) ( end - *p ) )
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return( POLARSSL_ERR_ASN1_OUT_OF_DATA );
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return( 0 );
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}
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int asn1_get_tag( unsigned char **p,
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const unsigned char *end,
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size_t *len, int tag )
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{
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if( ( end - *p ) < 1 )
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return( POLARSSL_ERR_ASN1_OUT_OF_DATA );
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if( **p != tag )
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return( POLARSSL_ERR_ASN1_UNEXPECTED_TAG );
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(*p)++;
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return( asn1_get_len( p, end, len ) );
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}
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int asn1_get_bool( unsigned char **p,
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const unsigned char *end,
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int *val )
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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, ASN1_BOOLEAN ) ) != 0 )
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return( ret );
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if( len != 1 )
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return( POLARSSL_ERR_ASN1_INVALID_LENGTH );
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*val = ( **p != 0 ) ? 1 : 0;
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(*p)++;
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return( 0 );
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}
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int asn1_get_int( unsigned char **p,
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const unsigned char *end,
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int *val )
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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, ASN1_INTEGER ) ) != 0 )
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return( ret );
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if( len > sizeof( int ) || ( **p & 0x80 ) != 0 )
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return( POLARSSL_ERR_ASN1_INVALID_LENGTH );
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*val = 0;
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while( len-- > 0 )
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{
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*val = ( *val << 8 ) | **p;
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(*p)++;
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}
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return( 0 );
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}
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#if defined(POLARSSL_BIGNUM_C)
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int asn1_get_mpi( unsigned char **p,
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const unsigned char *end,
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mpi *X )
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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, ASN1_INTEGER ) ) != 0 )
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return( ret );
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ret = mpi_read_binary( X, *p, len );
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*p += len;
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return( ret );
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}
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#endif /* POLARSSL_BIGNUM_C */
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int asn1_get_bitstring( unsigned char **p, const unsigned char *end,
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asn1_bitstring *bs)
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{
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int ret;
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/* Certificate type is a single byte bitstring */
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if( ( ret = asn1_get_tag( p, end, &bs->len, ASN1_BIT_STRING ) ) != 0 )
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return( ret );
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/* Check length, subtract one for actual bit string length */
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if( bs->len < 1 )
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return( POLARSSL_ERR_ASN1_OUT_OF_DATA );
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bs->len -= 1;
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/* Get number of unused bits, ensure unused bits <= 7 */
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bs->unused_bits = **p;
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if( bs->unused_bits > 7 )
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return( POLARSSL_ERR_ASN1_INVALID_LENGTH );
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(*p)++;
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/* Get actual bitstring */
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bs->p = *p;
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*p += bs->len;
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if( *p != end )
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return( POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
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return( 0 );
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}
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/*
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* Get a bit string without unused bits
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*/
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int asn1_get_bitstring_null( unsigned char **p, const unsigned char *end,
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size_t *len )
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{
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int ret;
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if( ( ret = asn1_get_tag( p, end, len, ASN1_BIT_STRING ) ) != 0 )
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return( ret );
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if( (*len)-- < 2 || *(*p)++ != 0 )
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return( POLARSSL_ERR_ASN1_INVALID_DATA );
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return( 0 );
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}
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/*
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* Parses and splits an ASN.1 "SEQUENCE OF <tag>"
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*/
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int asn1_get_sequence_of( unsigned char **p,
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const unsigned char *end,
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asn1_sequence *cur,
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int tag)
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{
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int ret;
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size_t len;
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asn1_buf *buf;
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/* Get main sequence tag */
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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( ret );
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if( *p + len != end )
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return( POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
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while( *p < end )
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{
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buf = &(cur->buf);
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buf->tag = **p;
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if( ( ret = asn1_get_tag( p, end, &buf->len, tag ) ) != 0 )
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return( ret );
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buf->p = *p;
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*p += buf->len;
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/* Allocate and assign next pointer */
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if( *p < end )
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{
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cur->next = (asn1_sequence *) polarssl_malloc(
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sizeof( asn1_sequence ) );
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if( cur->next == NULL )
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return( POLARSSL_ERR_ASN1_MALLOC_FAILED );
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memset( cur->next, 0, sizeof( asn1_sequence ) );
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cur = cur->next;
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}
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}
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/* Set final sequence entry's next pointer to NULL */
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cur->next = NULL;
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if( *p != end )
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return( POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
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return( 0 );
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}
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int asn1_get_alg( unsigned char **p,
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const unsigned char *end,
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asn1_buf *alg, asn1_buf *params )
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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( ret );
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if( ( end - *p ) < 1 )
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return( POLARSSL_ERR_ASN1_OUT_OF_DATA );
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alg->tag = **p;
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end = *p + len;
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if( ( ret = asn1_get_tag( p, end, &alg->len, ASN1_OID ) ) != 0 )
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return( ret );
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alg->p = *p;
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*p += alg->len;
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if( *p == end )
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{
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polarssl_zeroize( params, sizeof(asn1_buf) );
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return( 0 );
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}
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params->tag = **p;
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(*p)++;
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if( ( ret = asn1_get_len( p, end, ¶ms->len ) ) != 0 )
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return( 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_ASN1_LENGTH_MISMATCH );
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return( 0 );
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}
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int asn1_get_alg_null( unsigned char **p,
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const unsigned char *end,
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asn1_buf *alg )
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{
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int ret;
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asn1_buf params;
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memset( ¶ms, 0, sizeof(asn1_buf) );
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if( ( ret = asn1_get_alg( p, end, alg, ¶ms ) ) != 0 )
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return( ret );
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if( ( params.tag != ASN1_NULL && params.tag != 0 ) || params.len != 0 )
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return( POLARSSL_ERR_ASN1_INVALID_DATA );
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return( 0 );
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}
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void asn1_free_named_data( asn1_named_data *cur )
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{
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if( cur == NULL )
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return;
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polarssl_free( cur->oid.p );
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polarssl_free( cur->val.p );
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polarssl_zeroize( cur, sizeof( asn1_named_data ) );
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}
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void asn1_free_named_data_list( asn1_named_data **head )
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{
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asn1_named_data *cur;
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while( ( cur = *head ) != NULL )
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{
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*head = cur->next;
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asn1_free_named_data( cur );
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polarssl_free( cur );
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}
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}
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asn1_named_data *asn1_find_named_data( asn1_named_data *list,
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const char *oid, size_t len )
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{
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while( list != NULL )
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{
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if( list->oid.len == len &&
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memcmp( list->oid.p, oid, len ) == 0 )
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{
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break;
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}
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list = list->next;
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}
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return( list );
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}
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#endif /* POLARSSL_ASN1_PARSE_C */
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