452 lines
8.3 KiB
C
452 lines
8.3 KiB
C
/**
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* FreeRDP: A Remote Desktop Protocol Implementation
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* ASN.1 Encoding Rules (BER/DER common functions)
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*
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* Copyright 2011 Marc-Andre Moreau <marcandre.moreau@gmail.com>
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* Modified by 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/er.h>
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#include <freerdp/crypto/ber.h>
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#include <freerdp/crypto/der.h>
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void er_read_length(wStream* s, int* length)
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{
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BYTE byte;
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Stream_Read_UINT8(s, byte);
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if (!length)
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return;
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*length = 0;
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if (!s)
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return;
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if (byte & 0x80)
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{
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byte &= ~(0x80);
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if (byte == 1)
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Stream_Read_UINT8(s, *length);
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if (byte == 2)
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Stream_Read_UINT16_BE(s, *length);
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}
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else
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{
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*length = byte;
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}
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}
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/**
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* Write er length.
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* @param s stream
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* @param length length
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*/
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int er_write_length(wStream* s, int length, BOOL flag)
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{
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if (flag)
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return der_write_length(s, length);
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else
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return ber_write_length(s, length);
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}
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int _er_skip_length(int length)
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{
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if (length > 0x7F)
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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 er_get_content_length(int length)
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{
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if (length - 1 > 0x7F)
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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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/**
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* Read er Universal tag.
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* @param s stream
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* @param tag er universally-defined tag
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* @return
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*/
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BOOL er_read_universal_tag(wStream* s, BYTE tag, BOOL pc)
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{
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BYTE byte;
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Stream_Read_UINT8(s, byte);
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if (byte != (ER_CLASS_UNIV | ER_PC(pc) | (ER_TAG_MASK & tag)))
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return FALSE;
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return TRUE;
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}
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/**
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* Write er Universal tag.
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* @param s stream
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* @param tag er universally-defined tag
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* @param pc primitive (FALSE) or constructed (TRUE)
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*/
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void er_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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/**
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* Read er Application tag.
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* @param s stream
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* @param tag er application-defined tag
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* @param length length
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*/
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BOOL er_read_application_tag(wStream* s, BYTE tag, int* length)
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{
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BYTE byte;
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if (tag > 30)
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{
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Stream_Read_UINT8(s, byte);
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if (byte != ((ER_CLASS_APPL | ER_CONSTRUCT) | ER_TAG_MASK))
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return FALSE;
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Stream_Read_UINT8(s, byte);
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if (byte != tag)
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return FALSE;
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er_read_length(s, length);
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}
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else
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{
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Stream_Read_UINT8(s, byte);
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if (byte != ((ER_CLASS_APPL | ER_CONSTRUCT) | (ER_TAG_MASK & tag)))
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return FALSE;
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er_read_length(s, length);
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}
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return TRUE;
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}
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/**
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* Write er Application tag.
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* @param s stream
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* @param tag er application-defined tag
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* @param length length
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*/
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void er_write_application_tag(wStream* s, BYTE tag, int length, BOOL flag)
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{
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if (tag > 30)
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{
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Stream_Write_UINT8(s, (ER_CLASS_APPL | ER_CONSTRUCT) | ER_TAG_MASK);
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Stream_Write_UINT8(s, tag);
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er_write_length(s, length, flag);
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}
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else
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{
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Stream_Write_UINT8(s, (ER_CLASS_APPL | ER_CONSTRUCT) | (ER_TAG_MASK & tag));
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er_write_length(s, length, flag);
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}
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}
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BOOL er_read_contextual_tag(wStream* s, BYTE tag, int* length, BOOL pc)
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{
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BYTE byte;
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Stream_Read_UINT8(s, byte);
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if (byte != ((ER_CLASS_CTXT | ER_PC(pc)) | (ER_TAG_MASK & tag)))
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{
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Stream_Rewind(s, 1);
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return FALSE;
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}
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er_read_length(s, length);
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return TRUE;
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}
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int er_write_contextual_tag(wStream* s, BYTE tag, int length, BOOL pc, BOOL flag)
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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 er_write_length(s, length, flag) + 1;
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}
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int er_skip_contextual_tag(int length)
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{
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return _er_skip_length(length) + 1;
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}
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BOOL er_read_sequence_tag(wStream* s, int* length)
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{
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BYTE byte;
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Stream_Read_UINT8(s, byte);
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if (byte != ((ER_CLASS_UNIV | ER_CONSTRUCT) | (ER_TAG_SEQUENCE_OF)))
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return FALSE;
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er_read_length(s, length);
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return TRUE;
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}
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/**
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* Write er SEQUENCE tag.
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* @param s stream
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* @param length length
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*/
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int er_write_sequence_tag(wStream* s, int length, BOOL flag)
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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 er_write_length(s, length, flag) + 1;
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}
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int er_skip_sequence(int length)
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{
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return 1 + _er_skip_length(length) + length;
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}
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int er_skip_sequence_tag(int length)
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{
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return 1 + _er_skip_length(length);
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}
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BOOL er_read_enumerated(wStream* s, BYTE* enumerated, BYTE count)
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{
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int length = 0;
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er_read_universal_tag(s, ER_TAG_ENUMERATED, FALSE);
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er_read_length(s, &length);
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if (length == 1)
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Stream_Read_UINT8(s, *enumerated);
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else
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return FALSE;
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/* check that enumerated value falls within expected range */
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if (*enumerated + 1 > count)
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return FALSE;
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return TRUE;
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}
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void er_write_enumerated(wStream* s, BYTE enumerated, BYTE count, BOOL flag)
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{
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er_write_universal_tag(s, ER_TAG_ENUMERATED, FALSE);
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er_write_length(s, 1, flag);
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Stream_Write_UINT8(s, enumerated);
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}
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BOOL er_read_bit_string(wStream* s, int* length, BYTE* padding)
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{
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er_read_universal_tag(s, ER_TAG_BIT_STRING, FALSE);
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er_read_length(s, length);
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Stream_Read_UINT8(s, *padding);
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return TRUE;
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}
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BOOL er_write_bit_string_tag(wStream* s, UINT32 length, BYTE padding, BOOL flag)
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{
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er_write_universal_tag(s, ER_TAG_BIT_STRING, FALSE);
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er_write_length(s, length, flag);
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Stream_Write_UINT8(s, padding);
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return TRUE;
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}
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BOOL er_read_octet_string(wStream* s, int* length)
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{
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if (!er_read_universal_tag(s, ER_TAG_OCTET_STRING, FALSE))
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return FALSE;
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er_read_length(s, length);
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return TRUE;
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}
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/**
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* Write a er OCTET_STRING
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* @param s stream
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* @param oct_str octet string
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* @param length string length
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*/
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void er_write_octet_string(wStream* s, BYTE* oct_str, int length, BOOL flag)
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{
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er_write_universal_tag(s, ER_TAG_OCTET_STRING, FALSE);
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er_write_length(s, length, flag);
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Stream_Write(s, oct_str, length);
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}
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int er_write_octet_string_tag(wStream* s, int length, BOOL flag)
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{
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er_write_universal_tag(s, ER_TAG_OCTET_STRING, FALSE);
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er_write_length(s, length, flag);
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return 1 + _er_skip_length(length);
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}
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int er_skip_octet_string(int length)
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{
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return 1 + _er_skip_length(length) + length;
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}
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/**
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* Read a er BOOLEAN
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* @param s
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* @param value
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*/
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BOOL er_read_BOOL(wStream* s, BOOL* value)
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{
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int length = 0;
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BYTE v;
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if (!er_read_universal_tag(s, ER_TAG_BOOLEAN, FALSE))
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return FALSE;
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er_read_length(s, &length);
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if (length != 1)
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return FALSE;
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Stream_Read_UINT8(s, v);
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*value = (v ? TRUE : FALSE);
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return TRUE;
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}
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/**
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* Write a er BOOLEAN
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* @param s
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* @param value
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*/
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void er_write_BOOL(wStream* s, BOOL value)
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{
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er_write_universal_tag(s, ER_TAG_BOOLEAN, FALSE);
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er_write_length(s, 1, FALSE);
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Stream_Write_UINT8(s, (value == TRUE) ? 0xFF : 0);
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}
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BOOL er_read_integer(wStream* s, UINT32* value)
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{
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int length = 0;
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er_read_universal_tag(s, ER_TAG_INTEGER, FALSE);
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er_read_length(s, &length);
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if (value == NULL)
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{
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Stream_Seek(s, length);
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return TRUE;
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}
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if (length == 1)
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{
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Stream_Read_UINT8(s, *value);
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}
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else if (length == 2)
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{
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Stream_Read_UINT16_BE(s, *value);
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}
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else if (length == 3)
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{
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BYTE byte;
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Stream_Read_UINT8(s, byte);
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Stream_Read_UINT16_BE(s, *value);
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*value += (byte << 16);
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}
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else if (length == 4)
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{
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Stream_Read_UINT32_BE(s, *value);
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}
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else
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{
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return FALSE;
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}
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return TRUE;
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}
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/**
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* Write a er INTEGER
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* @param s
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* @param value
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*/
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int er_write_integer(wStream* s, INT32 value)
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{
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er_write_universal_tag(s, ER_TAG_INTEGER, FALSE);
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if (value <= 127 && value >= -128)
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{
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er_write_length(s, 1, FALSE);
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Stream_Write_UINT8(s, value);
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return 2;
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}
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else if (value <= 32767 && value >= -32768)
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{
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er_write_length(s, 2, FALSE);
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Stream_Write_UINT16_BE(s, value);
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return 3;
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}
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else
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{
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er_write_length(s, 4, FALSE);
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Stream_Write_UINT32_BE(s, value);
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return 5;
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}
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return 0;
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}
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int er_skip_integer(INT32 value)
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{
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if (value <= 127 && value >= -128)
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{
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return _er_skip_length(1) + 2;
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}
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else if (value <= 32767 && value >= -32768)
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{
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return _er_skip_length(2) + 3;
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}
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else
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{
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return _er_skip_length(4) + 5;
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}
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return 0;
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}
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BOOL er_read_integer_length(wStream* s, int* length)
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{
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er_read_universal_tag(s, ER_TAG_INTEGER, FALSE);
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er_read_length(s, length);
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return TRUE;
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}
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