496 lines
8.9 KiB
C
496 lines
8.9 KiB
C
/**
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* FreeRDP: A Remote Desktop Protocol Implementation
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* ASN.1 Packed Encoding Rules (BER)
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*
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* Copyright 2011-2012 Marc-Andre Moreau <marcandre.moreau@gmail.com>
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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 <freerdp/crypto/per.h>
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/**
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* Read PER length.
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* @param s stream
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* @param length length
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* @return
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*/
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BOOL per_read_length(wStream* s, UINT16* length)
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{
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BYTE byte;
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if (Stream_GetRemainingLength(s) < 1)
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return FALSE;
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Stream_Read_UINT8(s, byte);
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if (byte & 0x80)
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{
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if (Stream_GetRemainingLength(s) < 1)
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return FALSE;
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byte &= ~(0x80);
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*length = (byte << 8);
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Stream_Read_UINT8(s, byte);
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*length += byte;
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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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return TRUE;
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}
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/**
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* Write PER length.
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* @param s stream
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* @param length length
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*/
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void per_write_length(wStream* s, int length)
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{
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if (length > 0x7F)
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Stream_Write_UINT16_BE(s, (length | 0x8000));
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else
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Stream_Write_UINT8(s, length);
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}
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/**
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* Read PER choice.
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* @param s stream
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* @param choice choice
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* @return
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*/
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BOOL per_read_choice(wStream* s, BYTE* choice)
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{
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if (Stream_GetRemainingLength(s) < 1)
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return FALSE;
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Stream_Read_UINT8(s, *choice);
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return TRUE;
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}
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/**
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* Write PER CHOICE.
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* @param s stream
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* @param choice index of chosen field
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*/
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void per_write_choice(wStream* s, BYTE choice)
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{
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Stream_Write_UINT8(s, choice);
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}
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/**
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* Read PER selection.
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* @param s stream
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* @param selection selection
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* @return
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*/
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BOOL per_read_selection(wStream* s, BYTE* selection)
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{
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if (Stream_GetRemainingLength(s) < 1)
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return FALSE;
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Stream_Read_UINT8(s, *selection);
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return TRUE;
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}
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/**
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* Write PER selection for OPTIONAL fields.
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* @param s stream
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* @param selection bit map of selected fields
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*/
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void per_write_selection(wStream* s, BYTE selection)
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{
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Stream_Write_UINT8(s, selection);
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}
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/**
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* Read PER number of sets.
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* @param s stream
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* @param number number of sets
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* @return
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*/
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BOOL per_read_number_of_sets(wStream* s, BYTE* number)
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{
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if (Stream_GetRemainingLength(s) < 1)
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return FALSE;
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Stream_Read_UINT8(s, *number);
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return TRUE;
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}
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/**
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* Write PER number of sets for SET OF.
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* @param s stream
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* @param number number of sets
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*/
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void per_write_number_of_sets(wStream* s, BYTE number)
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{
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Stream_Write_UINT8(s, number);
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}
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/**
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* Read PER padding with zeros.
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* @param s stream
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* @param length
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*/
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BOOL per_read_padding(wStream* s, int length)
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{
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if (((int)Stream_GetRemainingLength(s)) < length)
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return FALSE;
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Stream_Seek(s, length);
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return TRUE;
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}
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/**
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* Write PER padding with zeros.
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* @param s stream
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* @param length
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*/
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void per_write_padding(wStream* s, int length)
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{
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int i;
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for (i = 0; i < length; i++)
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Stream_Write_UINT8(s, 0);
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}
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/**
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* Read PER INTEGER.
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* @param s stream
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* @param integer integer
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* @return
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*/
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BOOL per_read_integer(wStream* s, UINT32* integer)
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{
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UINT16 length;
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if (!per_read_length(s, &length))
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return FALSE;
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if (Stream_GetRemainingLength(s) < length)
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return FALSE;
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if (length == 0)
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*integer = 0;
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else if (length == 1)
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Stream_Read_UINT8(s, *integer);
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else if (length == 2)
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Stream_Read_UINT16_BE(s, *integer);
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else
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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 PER INTEGER.
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* @param s stream
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* @param integer integer
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*/
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void per_write_integer(wStream* s, UINT32 integer)
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{
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if (integer <= 0xFF)
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{
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per_write_length(s, 1);
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Stream_Write_UINT8(s, integer);
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}
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else if (integer <= 0xFFFF)
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{
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per_write_length(s, 2);
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Stream_Write_UINT16_BE(s, integer);
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}
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else if (integer <= 0xFFFFFFFF)
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{
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per_write_length(s, 4);
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Stream_Write_UINT32_BE(s, integer);
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}
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}
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/**
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* Read PER INTEGER (UINT16).
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* @param s stream
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* @param integer integer
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* @param min minimum value
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* @return
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*/
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BOOL per_read_integer16(wStream* s, UINT16* integer, UINT16 min)
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{
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if (Stream_GetRemainingLength(s) < 2)
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return FALSE;
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Stream_Read_UINT16_BE(s, *integer);
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if (*integer + min > 0xFFFF)
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return FALSE;
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*integer += min;
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return TRUE;
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}
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/**
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* Write PER INTEGER (UINT16).
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* @param s stream
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* @param integer integer
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* @param min minimum value
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*/
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void per_write_integer16(wStream* s, UINT16 integer, UINT16 min)
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{
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Stream_Write_UINT16_BE(s, integer - min);
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}
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/**
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* Read PER ENUMERATED.
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* @param s stream
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* @param enumerated enumerated
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* @param count enumeration count
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* @return
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*/
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BOOL per_read_enumerated(wStream* s, BYTE* enumerated, BYTE count)
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{
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if (Stream_GetRemainingLength(s) < 1)
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return FALSE;
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Stream_Read_UINT8(s, *enumerated);
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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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/**
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* Write PER ENUMERATED.
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* @param s stream
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* @param enumerated enumerated
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* @param count enumeration count
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* @return
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*/
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void per_write_enumerated(wStream* s, BYTE enumerated, BYTE count)
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{
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Stream_Write_UINT8(s, enumerated);
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}
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/**
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* Read PER OBJECT_IDENTIFIER (OID).
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* @param s stream
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* @param oid object identifier (OID)
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* @warning It works correctly only for limited set of OIDs.
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* @return
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*/
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BOOL per_read_object_identifier(wStream* s, BYTE oid[6])
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{
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BYTE t12;
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UINT16 length;
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BYTE a_oid[6];
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if (!per_read_length(s, &length))
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return FALSE;
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if (length != 5)
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return FALSE;
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if (Stream_GetRemainingLength(s) < length)
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return FALSE;
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Stream_Read_UINT8(s, t12); /* first two tuples */
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a_oid[0] = t12 / 40;
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a_oid[1] = t12 % 40;
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Stream_Read_UINT8(s, a_oid[2]); /* tuple 3 */
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Stream_Read_UINT8(s, a_oid[3]); /* tuple 4 */
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Stream_Read_UINT8(s, a_oid[4]); /* tuple 5 */
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Stream_Read_UINT8(s, a_oid[5]); /* tuple 6 */
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if ((a_oid[0] == oid[0]) && (a_oid[1] == oid[1]) && (a_oid[2] == oid[2]) &&
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(a_oid[3] == oid[3]) && (a_oid[4] == oid[4]) && (a_oid[5] == oid[5]))
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{
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return TRUE;
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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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}
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/**
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* Write PER OBJECT_IDENTIFIER (OID)
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* @param s stream
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* @param oid object identifier (oid)
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* @warning It works correctly only for limited set of OIDs.
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*/
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void per_write_object_identifier(wStream* s, BYTE oid[6])
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{
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BYTE t12 = oid[0] * 40 + oid[1];
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Stream_Write_UINT8(s, 5); /* length */
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Stream_Write_UINT8(s, t12); /* first two tuples */
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Stream_Write_UINT8(s, oid[2]); /* tuple 3 */
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Stream_Write_UINT8(s, oid[3]); /* tuple 4 */
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Stream_Write_UINT8(s, oid[4]); /* tuple 5 */
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Stream_Write_UINT8(s, oid[5]); /* tuple 6 */
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}
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/**
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* Write PER string.
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* @param s stream
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* @param str string
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* @param length string length
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*/
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static void per_write_string(wStream* s, BYTE* str, int length)
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{
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int i;
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for (i = 0; i < length; i++)
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Stream_Write_UINT8(s, str[i]);
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}
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/**
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* Read PER 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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* @param min minimum length
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* @return
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*/
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BOOL per_read_octet_string(wStream* s, BYTE* oct_str, int length, int min)
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{
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int i;
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UINT16 mlength;
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BYTE* a_oct_str;
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if (!per_read_length(s, &mlength))
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return FALSE;
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if (mlength + min != length)
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return FALSE;
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if (((int)Stream_GetRemainingLength(s)) < length)
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return FALSE;
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a_oct_str = Stream_Pointer(s);
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Stream_Seek(s, length);
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for (i = 0; i < length; i++)
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{
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if (a_oct_str[i] != oct_str[i])
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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 PER 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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* @param min minimum string length
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*/
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void per_write_octet_string(wStream* s, BYTE* oct_str, int length, int min)
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{
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int i;
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int mlength;
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mlength = (length - min >= 0) ? length - min : min;
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per_write_length(s, mlength);
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for (i = 0; i < length; i++)
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Stream_Write_UINT8(s, oct_str[i]);
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}
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/**
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* Read PER NumericString.
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* @param s stream
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* @param num_str numeric string
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* @param length string length
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* @param min minimum string length
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*/
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BOOL per_read_numeric_string(wStream* s, int min)
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{
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int length;
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UINT16 mlength;
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if (!per_read_length(s, &mlength))
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return FALSE;
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length = (mlength + min + 1) / 2;
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if (((int)Stream_GetRemainingLength(s)) < length)
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return FALSE;
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Stream_Seek(s, length);
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return TRUE;
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}
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/**
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* Write PER NumericString.
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* @param s stream
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* @param num_str numeric string
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* @param length string length
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* @param min minimum string length
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*/
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void per_write_numeric_string(wStream* s, BYTE* num_str, int length, int min)
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{
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int i;
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int mlength;
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BYTE num, c1, c2;
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mlength = (length - min >= 0) ? length - min : min;
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per_write_length(s, mlength);
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for (i = 0; i < length; i += 2)
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{
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c1 = num_str[i];
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c2 = ((i + 1) < length) ? num_str[i + 1] : 0x30;
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c1 = (c1 - 0x30) % 10;
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c2 = (c2 - 0x30) % 10;
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num = (c1 << 4) | c2;
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Stream_Write_UINT8(s, num); /* string */
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}
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}
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