| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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. |
| */ |
| |
| #include "config.h" |
| |
| #include <openssl/bn.h> |
| #include <openssl/ossl_typ.h> |
| |
| #include <stdint.h> |
| #include <string.h> |
| #include <stdlib.h> |
| |
| void guac_common_ssh_buffer_write_byte(char** buffer, uint8_t value) { |
| |
| uint8_t* data = (uint8_t*) *buffer; |
| *data = value; |
| |
| (*buffer)++; |
| |
| } |
| |
| void guac_common_ssh_buffer_write_uint32(char** buffer, uint32_t value) { |
| |
| uint8_t* data = (uint8_t*) *buffer; |
| |
| data[0] = (value & 0xFF000000) >> 24; |
| data[1] = (value & 0x00FF0000) >> 16; |
| data[2] = (value & 0x0000FF00) >> 8; |
| data[3] = value & 0x000000FF; |
| |
| *buffer += 4; |
| |
| } |
| |
| void guac_common_ssh_buffer_write_data(char** buffer, const char* data, |
| int length) { |
| memcpy(*buffer, data, length); |
| *buffer += length; |
| } |
| |
| void guac_common_ssh_buffer_write_bignum(char** buffer, const BIGNUM* value) { |
| |
| unsigned char* bn_buffer; |
| int length; |
| |
| /* If zero, just write zero length */ |
| if (BN_is_zero(value)) { |
| guac_common_ssh_buffer_write_uint32(buffer, 0); |
| return; |
| } |
| |
| /* Allocate output buffer, add padding byte */ |
| length = BN_num_bytes(value); |
| bn_buffer = malloc(length); |
| |
| /* Convert BIGNUM */ |
| BN_bn2bin(value, bn_buffer); |
| |
| /* If first byte has high bit set, write padding byte */ |
| if (bn_buffer[0] & 0x80) { |
| guac_common_ssh_buffer_write_uint32(buffer, length+1); |
| guac_common_ssh_buffer_write_byte(buffer, 0); |
| } |
| else |
| guac_common_ssh_buffer_write_uint32(buffer, length); |
| |
| /* Write data */ |
| memcpy(*buffer, bn_buffer, length); |
| *buffer += length; |
| |
| free(bn_buffer); |
| |
| } |
| |
| void guac_common_ssh_buffer_write_string(char** buffer, const char* string, |
| int length) { |
| guac_common_ssh_buffer_write_uint32(buffer, length); |
| guac_common_ssh_buffer_write_data(buffer, string, length); |
| } |
| |
| uint8_t guac_common_ssh_buffer_read_byte(char** buffer) { |
| |
| uint8_t* data = (uint8_t*) *buffer; |
| uint8_t value = *data; |
| |
| (*buffer)++; |
| |
| return value; |
| |
| } |
| |
| uint32_t guac_common_ssh_buffer_read_uint32(char** buffer) { |
| |
| uint8_t* data = (uint8_t*) *buffer; |
| uint32_t value = |
| (data[0] << 24) |
| | (data[1] << 16) |
| | (data[2] << 8) |
| | data[3]; |
| |
| *buffer += 4; |
| |
| return value; |
| |
| } |
| |
| char* guac_common_ssh_buffer_read_string(char** buffer, int* length) { |
| |
| char* value; |
| |
| *length = guac_common_ssh_buffer_read_uint32(buffer); |
| value = *buffer; |
| |
| *buffer += *length; |
| |
| return value; |
| |
| } |
| |