107 lines
2.4 KiB
C
107 lines
2.4 KiB
C
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/**
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* FreeRDP: A Remote Desktop Protocol Implementation
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* ASN.1 Basic Encoding Rules (DER)
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*
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* Copyright 2011 Samsung, Author Jiten Pathy
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <winpr/crt.h>
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#include <freerdp/crypto/der.h>
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int _der_skip_length(int length)
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{
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if (length > 0x7F && length <= 0xFF)
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return 2;
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else if (length > 0xFF)
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return 3;
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else
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return 1;
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}
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int der_write_length(wStream* s, int length)
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{
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if (length > 0x7F && length <= 0xFF)
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{
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Stream_Write_UINT8(s, 0x81);
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Stream_Write_UINT8(s, length);
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return 2;
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}
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else if (length > 0xFF)
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{
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Stream_Write_UINT8(s, 0x82);
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Stream_Write_UINT16_BE(s, length);
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return 3;
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}
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else
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{
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Stream_Write_UINT8(s, length);
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return 1;
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}
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}
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int der_get_content_length(int length)
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{
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if (length > 0x81 && length <= 0x102)
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return length - 3;
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else if (length > 0x102)
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return length - 4;
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else
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return length - 2;
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}
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int der_skip_contextual_tag(int length)
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{
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return _der_skip_length(length) + 1;
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}
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int der_write_contextual_tag(wStream* s, BYTE tag, int length, BOOL pc)
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{
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Stream_Write_UINT8(s, (ER_CLASS_CTXT | ER_PC(pc)) | (ER_TAG_MASK & tag));
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return der_write_length(s, length) + 1;
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}
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static void der_write_universal_tag(wStream* s, BYTE tag, BOOL pc)
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{
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Stream_Write_UINT8(s, (ER_CLASS_UNIV | ER_PC(pc)) | (ER_TAG_MASK & tag));
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}
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int der_skip_octet_string(int length)
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{
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return 1 + _der_skip_length(length) + length;
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}
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void der_write_octet_string(wStream* s, BYTE* oct_str, int length)
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{
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der_write_universal_tag(s, ER_TAG_OCTET_STRING, FALSE);
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der_write_length(s, length);
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Stream_Write(s, oct_str, length);
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}
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int der_skip_sequence_tag(int length)
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{
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return 1 + _der_skip_length(length);
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}
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int der_write_sequence_tag(wStream* s, int length)
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{
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Stream_Write_UINT8(s, (ER_CLASS_UNIV | ER_CONSTRUCT) | (ER_TAG_MASK & ER_TAG_SEQUENCE));
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return der_write_length(s, length) + 1;
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}
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