273 lines
8.4 KiB
C
273 lines
8.4 KiB
C
/*******************************************************************************
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* Ledger Blue
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* (c) 2016 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 "os.h"
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#include "cx.h"
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#include <stdbool.h>
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#include "ethUtils.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 bufferLength,
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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 =
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(*(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 =
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(*(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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void getEthAddressFromKey(cx_ecfp_public_key_t *publicKey, uint8_t *out,
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app_cx_sha3_t *sha3Context) {
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uint8_t hashAddress[32];
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app_cx_sha3_init(sha3Context, 256);
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app_cx_hash((cx_hash_t *)sha3Context, CX_LAST, publicKey->W + 1, 64,
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hashAddress);
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os_memmove(out, hashAddress + 12, 20);
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}
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static const uint8_t const HEXDIGITS[] = "0123456789ABCDEF";
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#ifdef CHECKSUM_1
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static const uint8_t const MASK[] = {0x80, 0x40, 0x20, 0x10,
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0x08, 0x04, 0x02, 0x01};
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char convertDigit(uint8_t *address, uint8_t index, uint8_t *hash) {
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unsigned char digit = address[index / 2];
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if ((index % 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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return HEXDIGITS[digit];
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} else {
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unsigned char data = hash[index / 8];
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if (((data & MASK[index % 8]) != 0) && (digit > 9)) {
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return HEXDIGITS[digit] /*- 'a' + 'A'*/;
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} else {
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return HEXDIGITS[digit];
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}
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}
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}
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void getEthAddressStringFromKey(cx_ecfp_public_key_t *publicKey, uint8_t *out,
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app_cx_sha3_t *sha3Context) {
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uint8_t hashAddress[32];
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app_cx_sha3_init(sha3Context, 256);
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app_cx_hash((cx_hash_t *)sha3Context, CX_LAST, publicKey->W + 1, 64,
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hashAddress);
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getEthAddressStringFromBinary(hashAddress + 12, out, sha3Context);
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}
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void getEthAddressStringFromBinary(uint8_t *address, uint8_t *out,
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app_cx_sha3_t *sha3Context) {
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uint8_t hashChecksum[32];
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uint8_t i;
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app_cx_sha3_init(sha3Context, 256);
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app_cx_hash((cx_hash_t *)sha3Context, CX_LAST, address, 20, hashChecksum);
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for (i = 0; i < 40; i++) {
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out[i] = convertDigit(address, i, hashChecksum);
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}
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out[40] = '\0';
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}
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#else
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void getEthAddressStringFromKey(cx_ecfp_public_key_t *publicKey, uint8_t *out,
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app_cx_sha3_t *sha3Context) {
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uint8_t hashAddress[32];
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app_cx_sha3_init(sha3Context, 256);
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app_cx_hash((cx_hash_t *)sha3Context, CX_LAST, publicKey->W + 1, 64,
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hashAddress);
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getEthAddressStringFromBinary(hashAddress + 12, out, sha3Context);
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}
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void getEthAddressStringFromBinary(uint8_t *address, uint8_t *out,
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app_cx_sha3_t *sha3Context) {
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uint8_t hashChecksum[32];
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uint8_t tmp[40];
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uint8_t i;
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for (i = 0; i < 20; i++) {
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uint8_t digit = address[i];
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tmp[2 * i] = HEXDIGITS[(digit >> 4) & 0x0f];
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tmp[2 * i + 1] = HEXDIGITS[digit & 0x0f];
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}
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app_cx_sha3_init(sha3Context, 256);
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app_cx_hash((cx_hash_t *)sha3Context, CX_LAST, tmp, 40, hashChecksum);
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for (i = 0; i < 40; i++) {
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uint8_t hashDigit = hashChecksum[i / 2];
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if ((i % 2) == 0) {
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hashDigit = (hashDigit >> 4) & 0x0f;
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} else {
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hashDigit = hashDigit & 0x0f;
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}
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if ((hashDigit > 7) && (tmp[i] > '9')) {
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out[i] = tmp[i] /*- 'a' + 'A'*/;
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} else {
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out[i] = tmp[i];
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}
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}
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out[40] = '\0';
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}
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#endif
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bool adjustDecimals(char *src, uint32_t srcLength, char *target,
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uint32_t targetLength, 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 == decimals) {
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if (targetLength < srcLength + 1) {
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return false;
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}
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for (uint32_t i = 0; i < srcLength; i++) {
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target[i] = src[i];
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}
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target[srcLength] = '\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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target[offset++] = '.';
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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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}
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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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}
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return true;
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}
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