380 lines
11 KiB
C
380 lines
11 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 "shared_context.h"
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#include "utils.h"
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#include "ethUtils.h"
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#include "chainConfig.h"
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#include "ethUstream.h"
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#include "network.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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bool getEthAddressFromKey(cx_ecfp_public_key_t *publicKey, uint8_t *out, cx_sha3_t *sha3Context) {
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uint8_t hashAddress[INT256_LENGTH];
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if (cx_keccak_init_no_throw(sha3Context, 256) != CX_OK) {
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return false;
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}
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if (cx_hash_no_throw((cx_hash_t *) sha3Context,
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CX_LAST,
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publicKey->W + 1,
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64,
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hashAddress,
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32) != CX_OK) {
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return false;
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}
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memmove(out, hashAddress + 12, 20);
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return true;
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}
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bool getEthAddressStringFromKey(cx_ecfp_public_key_t *publicKey,
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char *out,
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cx_sha3_t *sha3Context,
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uint64_t chainId) {
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uint8_t hashAddress[INT256_LENGTH];
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if (cx_keccak_init_no_throw(sha3Context, 256) != CX_OK) {
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return false;
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}
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if (cx_hash_no_throw((cx_hash_t *) sha3Context,
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CX_LAST,
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publicKey->W + 1,
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64,
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hashAddress,
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32) != CX_OK) {
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return false;
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}
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if (!getEthAddressStringFromBinary(hashAddress + 12, out, sha3Context, chainId)) {
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return false;
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}
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return true;
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}
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bool u64_to_string(uint64_t src, char *dst, uint8_t dst_size) {
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// Copy the numbers in ASCII format.
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uint8_t i = 0;
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do {
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// Checking `i + 1` to make sure we have enough space for '\0'.
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if (i + 1 >= dst_size) {
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return false;
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}
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dst[i] = src % 10 + '0';
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src /= 10;
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i++;
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} while (src);
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// Null terminate string
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dst[i] = '\0';
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// Revert the string
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i--;
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uint8_t j = 0;
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while (j < i) {
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char tmp = dst[i];
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dst[i] = dst[j];
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dst[j] = tmp;
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i--;
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j++;
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}
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return true;
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}
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bool getEthAddressStringFromBinary(uint8_t *address,
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char *out,
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cx_sha3_t *sha3Context,
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uint64_t chainId) {
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// save some precious stack space
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union locals_union {
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uint8_t hashChecksum[INT256_LENGTH];
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uint8_t tmp[51];
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} locals_union;
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uint8_t i;
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bool eip1191 = false;
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uint32_t offset = 0;
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switch (chainId) {
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case 30:
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case 31:
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eip1191 = true;
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break;
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}
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if (eip1191) {
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if (!u64_to_string(chainId, (char *) locals_union.tmp, sizeof(locals_union.tmp))) {
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return false;
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}
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offset = strnlen((char *) locals_union.tmp, sizeof(locals_union.tmp));
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strlcat((char *) locals_union.tmp + offset, "0x", sizeof(locals_union.tmp) - offset);
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offset = strnlen((char *) locals_union.tmp, sizeof(locals_union.tmp));
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}
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for (i = 0; i < 20; i++) {
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uint8_t digit = address[i];
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locals_union.tmp[offset + 2 * i] = HEXDIGITS[(digit >> 4) & 0x0f];
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locals_union.tmp[offset + 2 * i + 1] = HEXDIGITS[digit & 0x0f];
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}
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if (cx_keccak_init_no_throw(sha3Context, 256) != CX_OK) {
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return false;
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}
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if (cx_hash_no_throw((cx_hash_t *) sha3Context,
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CX_LAST,
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locals_union.tmp,
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offset + 40,
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locals_union.hashChecksum,
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32) != CX_OK) {
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return false;
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}
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for (i = 0; i < 40; i++) {
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uint8_t digit = address[i / 2];
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if ((i % 2) == 0) {
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digit = (digit >> 4) & 0x0f;
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} else {
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digit = digit & 0x0f;
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}
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if (digit < 10) {
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out[i] = HEXDIGITS[digit];
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} else {
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int v = (locals_union.hashChecksum[i / 2] >> (4 * (1 - i % 2))) & 0x0f;
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if (v >= 8) {
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out[i] = HEXDIGITS[digit] - 'a' + 'A';
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} else {
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out[i] = HEXDIGITS[digit];
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}
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}
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}
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out[40] = '\0';
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return true;
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}
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/* Fills the `out` buffer with the lowercase string representation of the pubkey passed in as binary
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format by `in`. (eg: uint8_t*:0xb47e3cd837dDF8e4c57F05d70Ab865de6e193BBB ->
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char*:"0xb47e3cd837dDF8e4c57F05d70Ab865de6e193BBB\0" )
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`sha3` context doesn't have have to be initialized prior to call.*/
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bool getEthDisplayableAddress(uint8_t *in,
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char *out,
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size_t out_len,
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cx_sha3_t *sha3,
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uint64_t chainId) {
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if (out_len < 43) {
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strlcpy(out, "ERROR", out_len);
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return false;
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}
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out[0] = '0';
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out[1] = 'x';
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if (!getEthAddressStringFromBinary(in, out + 2, sha3, chainId)) {
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strlcpy(out, "ERROR", out_len);
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return false;
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}
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return true;
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}
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bool adjustDecimals(const char *src,
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size_t srcLength,
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char *target,
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size_t targetLength,
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uint8_t decimals) {
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uint32_t startOffset;
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uint32_t lastZeroOffset = 0;
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uint32_t offset = 0;
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if ((srcLength == 1) && (*src == '0')) {
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if (targetLength < 2) {
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return false;
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}
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target[0] = '0';
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target[1] = '\0';
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return true;
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}
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if (srcLength <= decimals) {
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uint32_t delta = decimals - srcLength;
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if (targetLength < srcLength + 1 + 2 + delta) {
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return false;
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}
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target[offset++] = '0';
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target[offset++] = '.';
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for (uint32_t i = 0; i < delta; i++) {
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target[offset++] = '0';
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}
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startOffset = offset;
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for (uint32_t i = 0; i < srcLength; i++) {
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target[offset++] = src[i];
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}
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target[offset] = '\0';
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} else {
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uint32_t sourceOffset = 0;
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uint32_t delta = srcLength - decimals;
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if (targetLength < srcLength + 1 + 1) {
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return false;
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}
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while (offset < delta) {
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target[offset++] = src[sourceOffset++];
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}
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if (decimals != 0) {
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target[offset++] = '.';
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}
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startOffset = offset;
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while (sourceOffset < srcLength) {
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target[offset++] = src[sourceOffset++];
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}
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target[offset] = '\0';
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}
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for (uint32_t i = startOffset; i < offset; i++) {
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if (target[i] == '0') {
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if (lastZeroOffset == 0) {
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lastZeroOffset = i;
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}
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} else {
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lastZeroOffset = 0;
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}
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}
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if (lastZeroOffset != 0) {
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target[lastZeroOffset] = '\0';
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if (target[lastZeroOffset - 1] == '.') {
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target[lastZeroOffset - 1] = '\0';
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}
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}
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return true;
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}
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// Returns the chain ID. Defaults to 0 if txType was not found (For TX).
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uint64_t get_tx_chain_id(void) {
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uint64_t chain_id = 0;
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switch (txContext.txType) {
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case LEGACY:
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chain_id = u64_from_BE(txContext.content->v, txContext.content->vLength);
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break;
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case EIP2930:
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case EIP1559:
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chain_id = u64_from_BE(tmpContent.txContent.chainID.value,
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tmpContent.txContent.chainID.length);
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break;
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default:
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PRINTF("Txtype `%d` not supported while generating chainID\n", txContext.txType);
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break;
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}
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return chain_id;
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}
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const char *get_displayable_ticker(const uint64_t *chain_id) {
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const char *ticker = get_network_ticker_from_chain_id(chain_id);
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if (ticker == NULL) {
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ticker = chainConfig->coinName;
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}
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return ticker;
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}
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