114 lines
3.6 KiB
C
114 lines
3.6 KiB
C
/*******************************************************************************
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* Ledger Ethereum App
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* (c) 2016-2019 Ledger
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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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/**
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* @brief Utilities for an Ethereum Hardware Wallet logic
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* @file ethUtils.h
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* @author Ledger Firmware Team <hello@ledger.fr>
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* @version 1.0
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* @date 8th of March 2016
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*/
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#include <stdbool.h>
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#include <stdint.h>
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#include <string.h>
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#include "rlp_utils.h"
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bool rlpCanDecode(uint8_t *buffer, uint32_t bufferLength, bool *valid) {
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if (*buffer <= 0x7f) {
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} else if (*buffer <= 0xb7) {
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} else if (*buffer <= 0xbf) {
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if (bufferLength < (1 + (*buffer - 0xb7))) {
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return false;
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}
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if (*buffer > 0xbb) {
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*valid = false; // arbitrary 32 bits length limitation
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return true;
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}
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} else if (*buffer <= 0xf7) {
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} else {
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if (bufferLength < (1 + (*buffer - 0xf7))) {
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return false;
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}
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if (*buffer > 0xfb) {
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*valid = false; // arbitrary 32 bits length limitation
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return true;
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}
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}
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*valid = true;
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return true;
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}
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bool rlpDecodeLength(uint8_t *buffer, uint32_t *fieldLength, uint32_t *offset, bool *list) {
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if (*buffer <= 0x7f) {
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*offset = 0;
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*fieldLength = 1;
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*list = false;
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} else if (*buffer <= 0xb7) {
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*offset = 1;
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*fieldLength = *buffer - 0x80;
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*list = false;
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} else if (*buffer <= 0xbf) {
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*offset = 1 + (*buffer - 0xb7);
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*list = false;
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switch (*buffer) {
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case 0xb8:
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*fieldLength = *(buffer + 1);
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break;
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case 0xb9:
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*fieldLength = (*(buffer + 1) << 8) + *(buffer + 2);
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break;
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case 0xba:
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*fieldLength = (*(buffer + 1) << 16) + (*(buffer + 2) << 8) + *(buffer + 3);
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break;
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case 0xbb:
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*fieldLength = (*(buffer + 1) << 24) + (*(buffer + 2) << 16) +
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(*(buffer + 3) << 8) + *(buffer + 4);
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break;
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default:
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return false; // arbitrary 32 bits length limitation
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}
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} else if (*buffer <= 0xf7) {
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*offset = 1;
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*fieldLength = *buffer - 0xc0;
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*list = true;
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} else {
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*offset = 1 + (*buffer - 0xf7);
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*list = true;
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switch (*buffer) {
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case 0xf8:
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*fieldLength = *(buffer + 1);
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break;
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case 0xf9:
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*fieldLength = (*(buffer + 1) << 8) + *(buffer + 2);
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break;
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case 0xfa:
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*fieldLength = (*(buffer + 1) << 16) + (*(buffer + 2) << 8) + *(buffer + 3);
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break;
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case 0xfb:
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*fieldLength = (*(buffer + 1) << 24) + (*(buffer + 2) << 16) +
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(*(buffer + 3) << 8) + *(buffer + 4);
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break;
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default:
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return false; // arbitrary 32 bits length limitation
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}
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}
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return true;
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}
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