--- /dev/null
+/*
+ * Generic ASN.1 parsing
+ *
+ * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
+ * SPDX-License-Identifier: GPL-2.0
+ *
+ * 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.
+ *
+ * This file is part of mbed TLS (https://tls.mbed.org)
+ */
+
+#if !defined(MBEDTLS_CONFIG_FILE)
+#include "mbedtls/config.h"
+#else
+#include MBEDTLS_CONFIG_FILE
+#endif
+
+#if defined(MBEDTLS_ASN1_PARSE_C)
+
+#include "mbedtls/asn1.h"
+#include "mbedtls/platform_util.h"
+
+#include <string.h>
+
+#if defined(MBEDTLS_BIGNUM_C)
+#include "mbedtls/bignum.h"
+#endif
+
+#if defined(MBEDTLS_PLATFORM_C)
+#include "mbedtls/platform.h"
+#else
+#include <stdlib.h>
+#define mbedtls_calloc calloc
+#define mbedtls_free free
+#endif
+
+/*
+ * ASN.1 DER decoding routines
+ */
+int mbedtls_asn1_get_len( unsigned char **p,
+ const unsigned char *end,
+ size_t *len )
+{
+ if( ( end - *p ) < 1 )
+ return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
+
+ if( ( **p & 0x80 ) == 0 )
+ *len = *(*p)++;
+ else
+ {
+ switch( **p & 0x7F )
+ {
+ case 1:
+ if( ( end - *p ) < 2 )
+ return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
+
+ *len = (*p)[1];
+ (*p) += 2;
+ break;
+
+ case 2:
+ if( ( end - *p ) < 3 )
+ return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
+
+ *len = ( (size_t)(*p)[1] << 8 ) | (*p)[2];
+ (*p) += 3;
+ break;
+
+ case 3:
+ if( ( end - *p ) < 4 )
+ return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
+
+ *len = ( (size_t)(*p)[1] << 16 ) |
+ ( (size_t)(*p)[2] << 8 ) | (*p)[3];
+ (*p) += 4;
+ break;
+
+ case 4:
+ if( ( end - *p ) < 5 )
+ return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
+
+ *len = ( (size_t)(*p)[1] << 24 ) | ( (size_t)(*p)[2] << 16 ) |
+ ( (size_t)(*p)[3] << 8 ) | (*p)[4];
+ (*p) += 5;
+ break;
+
+ default:
+ return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
+ }
+ }
+
+ if( *len > (size_t) ( end - *p ) )
+ return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
+
+ return( 0 );
+}
+
+int mbedtls_asn1_get_tag( unsigned char **p,
+ const unsigned char *end,
+ size_t *len, int tag )
+{
+ if( ( end - *p ) < 1 )
+ return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
+
+ if( **p != tag )
+ return( MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
+
+ (*p)++;
+
+ return( mbedtls_asn1_get_len( p, end, len ) );
+}
+
+int mbedtls_asn1_get_bool( unsigned char **p,
+ const unsigned char *end,
+ int *val )
+{
+ int ret;
+ size_t len;
+
+ if( ( ret = mbedtls_asn1_get_tag( p, end, &len, MBEDTLS_ASN1_BOOLEAN ) ) != 0 )
+ return( ret );
+
+ if( len != 1 )
+ return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
+
+ *val = ( **p != 0 ) ? 1 : 0;
+ (*p)++;
+
+ return( 0 );
+}
+
+int mbedtls_asn1_get_int( unsigned char **p,
+ const unsigned char *end,
+ int *val )
+{
+ int ret;
+ size_t len;
+
+ if( ( ret = mbedtls_asn1_get_tag( p, end, &len, MBEDTLS_ASN1_INTEGER ) ) != 0 )
+ return( ret );
+
+ if( len == 0 || len > sizeof( int ) || ( **p & 0x80 ) != 0 )
+ return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
+
+ *val = 0;
+
+ while( len-- > 0 )
+ {
+ *val = ( *val << 8 ) | **p;
+ (*p)++;
+ }
+
+ return( 0 );
+}
+
+#if defined(MBEDTLS_BIGNUM_C)
+int mbedtls_asn1_get_mpi( unsigned char **p,
+ const unsigned char *end,
+ mbedtls_mpi *X )
+{
+ int ret;
+ size_t len;
+
+ if( ( ret = mbedtls_asn1_get_tag( p, end, &len, MBEDTLS_ASN1_INTEGER ) ) != 0 )
+ return( ret );
+
+ ret = mbedtls_mpi_read_binary( X, *p, len );
+
+ *p += len;
+
+ return( ret );
+}
+#endif /* MBEDTLS_BIGNUM_C */
+
+int mbedtls_asn1_get_bitstring( unsigned char **p, const unsigned char *end,
+ mbedtls_asn1_bitstring *bs)
+{
+ int ret;
+
+ /* Certificate type is a single byte bitstring */
+ if( ( ret = mbedtls_asn1_get_tag( p, end, &bs->len, MBEDTLS_ASN1_BIT_STRING ) ) != 0 )
+ return( ret );
+
+ /* Check length, subtract one for actual bit string length */
+ if( bs->len < 1 )
+ return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
+ bs->len -= 1;
+
+ /* Get number of unused bits, ensure unused bits <= 7 */
+ bs->unused_bits = **p;
+ if( bs->unused_bits > 7 )
+ return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
+ (*p)++;
+
+ /* Get actual bitstring */
+ bs->p = *p;
+ *p += bs->len;
+
+ if( *p != end )
+ return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
+
+ return( 0 );
+}
+
+/*
+ * Get a bit string without unused bits
+ */
+int mbedtls_asn1_get_bitstring_null( unsigned char **p, const unsigned char *end,
+ size_t *len )
+{
+ int ret;
+
+ if( ( ret = mbedtls_asn1_get_tag( p, end, len, MBEDTLS_ASN1_BIT_STRING ) ) != 0 )
+ return( ret );
+
+ if( (*len)-- < 2 || *(*p)++ != 0 )
+ return( MBEDTLS_ERR_ASN1_INVALID_DATA );
+
+ return( 0 );
+}
+
+
+
+/*
+ * Parses and splits an ASN.1 "SEQUENCE OF <tag>"
+ */
+int mbedtls_asn1_get_sequence_of( unsigned char **p,
+ const unsigned char *end,
+ mbedtls_asn1_sequence *cur,
+ int tag)
+{
+ int ret;
+ size_t len;
+ mbedtls_asn1_buf *buf;
+
+ /* Get main sequence tag */
+ if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
+ MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
+ return( ret );
+
+ if( *p + len != end )
+ return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
+
+ while( *p < end )
+ {
+ buf = &(cur->buf);
+ buf->tag = **p;
+
+ if( ( ret = mbedtls_asn1_get_tag( p, end, &buf->len, tag ) ) != 0 )
+ return( ret );
+
+ buf->p = *p;
+ *p += buf->len;
+
+ /* Allocate and assign next pointer */
+ if( *p < end )
+ {
+ cur->next = (mbedtls_asn1_sequence*)mbedtls_calloc( 1,
+ sizeof( mbedtls_asn1_sequence ) );
+
+ if( cur->next == NULL )
+ return( MBEDTLS_ERR_ASN1_ALLOC_FAILED );
+
+ cur = cur->next;
+ }
+ }
+
+ /* Set final sequence entry's next pointer to NULL */
+ cur->next = NULL;
+
+ if( *p != end )
+ return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
+
+ return( 0 );
+}
+
+int mbedtls_asn1_get_alg( unsigned char **p,
+ const unsigned char *end,
+ mbedtls_asn1_buf *alg, mbedtls_asn1_buf *params )
+{
+ int ret;
+ size_t len;
+
+ if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
+ MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
+ return( ret );
+
+ if( ( end - *p ) < 1 )
+ return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
+
+ alg->tag = **p;
+ end = *p + len;
+
+ if( ( ret = mbedtls_asn1_get_tag( p, end, &alg->len, MBEDTLS_ASN1_OID ) ) != 0 )
+ return( ret );
+
+ alg->p = *p;
+ *p += alg->len;
+
+ if( *p == end )
+ {
+ mbedtls_platform_zeroize( params, sizeof(mbedtls_asn1_buf) );
+ return( 0 );
+ }
+
+ params->tag = **p;
+ (*p)++;
+
+ if( ( ret = mbedtls_asn1_get_len( p, end, ¶ms->len ) ) != 0 )
+ return( ret );
+
+ params->p = *p;
+ *p += params->len;
+
+ if( *p != end )
+ return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
+
+ return( 0 );
+}
+
+int mbedtls_asn1_get_alg_null( unsigned char **p,
+ const unsigned char *end,
+ mbedtls_asn1_buf *alg )
+{
+ int ret;
+ mbedtls_asn1_buf params;
+
+ memset( ¶ms, 0, sizeof(mbedtls_asn1_buf) );
+
+ if( ( ret = mbedtls_asn1_get_alg( p, end, alg, ¶ms ) ) != 0 )
+ return( ret );
+
+ if( ( params.tag != MBEDTLS_ASN1_NULL && params.tag != 0 ) || params.len != 0 )
+ return( MBEDTLS_ERR_ASN1_INVALID_DATA );
+
+ return( 0 );
+}
+
+void mbedtls_asn1_free_named_data( mbedtls_asn1_named_data *cur )
+{
+ if( cur == NULL )
+ return;
+
+ mbedtls_free( cur->oid.p );
+ mbedtls_free( cur->val.p );
+
+ mbedtls_platform_zeroize( cur, sizeof( mbedtls_asn1_named_data ) );
+}
+
+void mbedtls_asn1_free_named_data_list( mbedtls_asn1_named_data **head )
+{
+ mbedtls_asn1_named_data *cur;
+
+ while( ( cur = *head ) != NULL )
+ {
+ *head = cur->next;
+ mbedtls_asn1_free_named_data( cur );
+ mbedtls_free( cur );
+ }
+}
+
+mbedtls_asn1_named_data *mbedtls_asn1_find_named_data( mbedtls_asn1_named_data *list,
+ const char *oid, size_t len )
+{
+ while( list != NULL )
+ {
+ if( list->oid.len == len &&
+ memcmp( list->oid.p, oid, len ) == 0 )
+ {
+ break;
+ }
+
+ list = list->next;
+ }
+
+ return( list );
+}
+
+#endif /* MBEDTLS_ASN1_PARSE_C */
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