diff options
Diffstat (limited to 'FreeRTOS-Labs/Source/mbedtls/library/asn1write.c')
| -rw-r--r-- | FreeRTOS-Labs/Source/mbedtls/library/asn1write.c | 464 |
1 files changed, 464 insertions, 0 deletions
diff --git a/FreeRTOS-Labs/Source/mbedtls/library/asn1write.c b/FreeRTOS-Labs/Source/mbedtls/library/asn1write.c new file mode 100644 index 000000000..c231ef4b9 --- /dev/null +++ b/FreeRTOS-Labs/Source/mbedtls/library/asn1write.c @@ -0,0 +1,464 @@ +/*
+ * ASN.1 buffer writing functionality
+ *
+ * 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)
+ */
+
+#if !defined(MBEDTLS_CONFIG_FILE)
+#include "mbedtls/config.h"
+#else
+#include MBEDTLS_CONFIG_FILE
+#endif
+
+#if defined(MBEDTLS_ASN1_WRITE_C)
+
+#include "mbedtls/asn1write.h"
+
+#include <string.h>
+
+#if defined(MBEDTLS_PLATFORM_C)
+#include "mbedtls/platform.h"
+#else
+#include <stdlib.h>
+#define mbedtls_calloc calloc
+#define mbedtls_free free
+#endif
+
+int mbedtls_asn1_write_len( unsigned char **p, unsigned char *start, size_t len )
+{
+ if( len < 0x80 )
+ {
+ if( *p - start < 1 )
+ return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
+
+ *--(*p) = (unsigned char) len;
+ return( 1 );
+ }
+
+ if( len <= 0xFF )
+ {
+ if( *p - start < 2 )
+ return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
+
+ *--(*p) = (unsigned char) len;
+ *--(*p) = 0x81;
+ return( 2 );
+ }
+
+ if( len <= 0xFFFF )
+ {
+ if( *p - start < 3 )
+ return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
+
+ *--(*p) = ( len ) & 0xFF;
+ *--(*p) = ( len >> 8 ) & 0xFF;
+ *--(*p) = 0x82;
+ return( 3 );
+ }
+
+ if( len <= 0xFFFFFF )
+ {
+ if( *p - start < 4 )
+ return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
+
+ *--(*p) = ( len ) & 0xFF;
+ *--(*p) = ( len >> 8 ) & 0xFF;
+ *--(*p) = ( len >> 16 ) & 0xFF;
+ *--(*p) = 0x83;
+ return( 4 );
+ }
+
+#if SIZE_MAX > 0xFFFFFFFF
+ if( len <= 0xFFFFFFFF )
+#endif
+ {
+ if( *p - start < 5 )
+ return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
+
+ *--(*p) = ( len ) & 0xFF;
+ *--(*p) = ( len >> 8 ) & 0xFF;
+ *--(*p) = ( len >> 16 ) & 0xFF;
+ *--(*p) = ( len >> 24 ) & 0xFF;
+ *--(*p) = 0x84;
+ return( 5 );
+ }
+
+#if SIZE_MAX > 0xFFFFFFFF
+ return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
+#endif
+}
+
+int mbedtls_asn1_write_tag( unsigned char **p, unsigned char *start, unsigned char tag )
+{
+ if( *p - start < 1 )
+ return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
+
+ *--(*p) = tag;
+
+ return( 1 );
+}
+
+int mbedtls_asn1_write_raw_buffer( unsigned char **p, unsigned char *start,
+ const unsigned char *buf, size_t size )
+{
+ size_t len = 0;
+
+ if( *p < start || (size_t)( *p - start ) < size )
+ return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
+
+ len = size;
+ (*p) -= len;
+ memcpy( *p, buf, len );
+
+ return( (int) len );
+}
+
+#if defined(MBEDTLS_BIGNUM_C)
+int mbedtls_asn1_write_mpi( unsigned char **p, unsigned char *start, const mbedtls_mpi *X )
+{
+ int ret;
+ size_t len = 0;
+
+ // Write the MPI
+ //
+ len = mbedtls_mpi_size( X );
+
+ if( *p < start || (size_t)( *p - start ) < len )
+ return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
+
+ (*p) -= len;
+ MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( X, *p, len ) );
+
+ // DER format assumes 2s complement for numbers, so the leftmost bit
+ // should be 0 for positive numbers and 1 for negative numbers.
+ //
+ if( X->s ==1 && **p & 0x80 )
+ {
+ if( *p - start < 1 )
+ return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
+
+ *--(*p) = 0x00;
+ len += 1;
+ }
+
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_INTEGER ) );
+
+ ret = (int) len;
+
+cleanup:
+ return( ret );
+}
+#endif /* MBEDTLS_BIGNUM_C */
+
+int mbedtls_asn1_write_null( unsigned char **p, unsigned char *start )
+{
+ int ret;
+ size_t len = 0;
+
+ // Write NULL
+ //
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, 0) );
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_NULL ) );
+
+ return( (int) len );
+}
+
+int mbedtls_asn1_write_oid( unsigned char **p, unsigned char *start,
+ const char *oid, size_t oid_len )
+{
+ int ret;
+ size_t len = 0;
+
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_raw_buffer( p, start,
+ (const unsigned char *) oid, oid_len ) );
+ MBEDTLS_ASN1_CHK_ADD( len , mbedtls_asn1_write_len( p, start, len ) );
+ MBEDTLS_ASN1_CHK_ADD( len , mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_OID ) );
+
+ return( (int) len );
+}
+
+int mbedtls_asn1_write_algorithm_identifier( unsigned char **p, unsigned char *start,
+ const char *oid, size_t oid_len,
+ size_t par_len )
+{
+ int ret;
+ size_t len = 0;
+
+ if( par_len == 0 )
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_null( p, start ) );
+ else
+ len += par_len;
+
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_oid( p, start, oid, oid_len ) );
+
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start,
+ MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) );
+
+ return( (int) len );
+}
+
+int mbedtls_asn1_write_bool( unsigned char **p, unsigned char *start, int boolean )
+{
+ int ret;
+ size_t len = 0;
+
+ if( *p - start < 1 )
+ return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
+
+ *--(*p) = (boolean) ? 255 : 0;
+ len++;
+
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_BOOLEAN ) );
+
+ return( (int) len );
+}
+
+int mbedtls_asn1_write_int( unsigned char **p, unsigned char *start, int val )
+{
+ int ret;
+ size_t len = 0;
+
+ if( *p - start < 1 )
+ return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
+
+ len += 1;
+ *--(*p) = val;
+
+ if( val > 0 && **p & 0x80 )
+ {
+ if( *p - start < 1 )
+ return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
+
+ *--(*p) = 0x00;
+ len += 1;
+ }
+
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_INTEGER ) );
+
+ return( (int) len );
+}
+
+int mbedtls_asn1_write_tagged_string( unsigned char **p, unsigned char *start, int tag,
+ const char *text, size_t text_len )
+{
+ int ret;
+ size_t len = 0;
+
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_raw_buffer( p, start,
+ (const unsigned char *) text, text_len ) );
+
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, tag ) );
+
+ return( (int) len );
+}
+
+int mbedtls_asn1_write_utf8_string( unsigned char **p, unsigned char *start,
+ const char *text, size_t text_len )
+{
+ return( mbedtls_asn1_write_tagged_string(p, start, MBEDTLS_ASN1_UTF8_STRING, text, text_len) );
+}
+
+int mbedtls_asn1_write_printable_string( unsigned char **p, unsigned char *start,
+ const char *text, size_t text_len )
+{
+ return( mbedtls_asn1_write_tagged_string(p, start, MBEDTLS_ASN1_PRINTABLE_STRING, text, text_len) );
+}
+
+int mbedtls_asn1_write_ia5_string( unsigned char **p, unsigned char *start,
+ const char *text, size_t text_len )
+{
+ return( mbedtls_asn1_write_tagged_string(p, start, MBEDTLS_ASN1_IA5_STRING, text, text_len) );
+}
+
+int mbedtls_asn1_write_named_bitstring( unsigned char **p,
+ unsigned char *start,
+ const unsigned char *buf,
+ size_t bits )
+{
+ size_t unused_bits, byte_len;
+ const unsigned char *cur_byte;
+ unsigned char cur_byte_shifted;
+ unsigned char bit;
+
+ byte_len = ( bits + 7 ) / 8;
+ unused_bits = ( byte_len * 8 ) - bits;
+
+ /*
+ * Named bitstrings require that trailing 0s are excluded in the encoding
+ * of the bitstring. Trailing 0s are considered part of the 'unused' bits
+ * when encoding this value in the first content octet
+ */
+ if( bits != 0 )
+ {
+ cur_byte = buf + byte_len - 1;
+ cur_byte_shifted = *cur_byte >> unused_bits;
+
+ for( ; ; )
+ {
+ bit = cur_byte_shifted & 0x1;
+ cur_byte_shifted >>= 1;
+
+ if( bit != 0 )
+ break;
+
+ bits--;
+ if( bits == 0 )
+ break;
+
+ if( bits % 8 == 0 )
+ cur_byte_shifted = *--cur_byte;
+ }
+ }
+
+ return( mbedtls_asn1_write_bitstring( p, start, buf, bits ) );
+}
+
+int mbedtls_asn1_write_bitstring( unsigned char **p, unsigned char *start,
+ const unsigned char *buf, size_t bits )
+{
+ int ret;
+ size_t len = 0;
+ size_t unused_bits, byte_len;
+
+ byte_len = ( bits + 7 ) / 8;
+ unused_bits = ( byte_len * 8 ) - bits;
+
+ if( *p < start || (size_t)( *p - start ) < byte_len + 1 )
+ return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
+
+ len = byte_len + 1;
+
+ /* Write the bitstring. Ensure the unused bits are zeroed */
+ if( byte_len > 0 )
+ {
+ byte_len--;
+ *--( *p ) = buf[byte_len] & ~( ( 0x1 << unused_bits ) - 1 );
+ ( *p ) -= byte_len;
+ memcpy( *p, buf, byte_len );
+ }
+
+ /* Write unused bits */
+ *--( *p ) = (unsigned char)unused_bits;
+
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_BIT_STRING ) );
+
+ return( (int) len );
+}
+
+int mbedtls_asn1_write_octet_string( unsigned char **p, unsigned char *start,
+ const unsigned char *buf, size_t size )
+{
+ int ret;
+ size_t len = 0;
+
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_raw_buffer( p, start, buf, size ) );
+
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_OCTET_STRING ) );
+
+ return( (int) len );
+}
+
+
+/* This is a copy of the ASN.1 parsing function mbedtls_asn1_find_named_data(),
+ * which is replicated to avoid a dependency ASN1_WRITE_C on ASN1_PARSE_C. */
+static mbedtls_asn1_named_data *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 );
+}
+
+mbedtls_asn1_named_data *mbedtls_asn1_store_named_data(
+ mbedtls_asn1_named_data **head,
+ const char *oid, size_t oid_len,
+ const unsigned char *val,
+ size_t val_len )
+{
+ mbedtls_asn1_named_data *cur;
+
+ if( ( cur = asn1_find_named_data( *head, oid, oid_len ) ) == NULL )
+ {
+ // Add new entry if not present yet based on OID
+ //
+ cur = (mbedtls_asn1_named_data*)mbedtls_calloc( 1,
+ sizeof(mbedtls_asn1_named_data) );
+ if( cur == NULL )
+ return( NULL );
+
+ cur->oid.len = oid_len;
+ cur->oid.p = mbedtls_calloc( 1, oid_len );
+ if( cur->oid.p == NULL )
+ {
+ mbedtls_free( cur );
+ return( NULL );
+ }
+
+ memcpy( cur->oid.p, oid, oid_len );
+
+ cur->val.len = val_len;
+ cur->val.p = mbedtls_calloc( 1, val_len );
+ if( cur->val.p == NULL )
+ {
+ mbedtls_free( cur->oid.p );
+ mbedtls_free( cur );
+ return( NULL );
+ }
+
+ cur->next = *head;
+ *head = cur;
+ }
+ else if( cur->val.len < val_len )
+ {
+ /*
+ * Enlarge existing value buffer if needed
+ * Preserve old data until the allocation succeeded, to leave list in
+ * a consistent state in case allocation fails.
+ */
+ void *p = mbedtls_calloc( 1, val_len );
+ if( p == NULL )
+ return( NULL );
+
+ mbedtls_free( cur->val.p );
+ cur->val.p = p;
+ cur->val.len = val_len;
+ }
+
+ if( val != NULL )
+ memcpy( cur->val.p, val, val_len );
+
+ return( cur );
+}
+#endif /* MBEDTLS_ASN1_WRITE_C */
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