BTChip github
7 years ago
14 changed files with 321 additions and 35 deletions
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/* Copyright (c) 2017 Pieter Wuille
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* Modified work Copyright (c) 2018 Jonas Karlsson |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy |
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* of this software and associated documentation files (the "Software"), to deal |
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* in the Software without restriction, including without limitation the rights |
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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* copies of the Software, and to permit persons to whom the Software is |
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* furnished to do so, subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included in |
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* all copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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* THE SOFTWARE. |
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*/ |
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#include "os.h" |
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#include "cx.h" |
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#include <stdlib.h> |
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#include <stdint.h> |
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#include <string.h> |
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#include <inttypes.h> |
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#include "cashaddr.h" |
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static const char *charset = "qpzry9x8gf2tvdw0s3jn54khce6mua7l"; |
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uint64_t cashaddr_polymod_step(uint64_t pre) { |
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uint8_t b = pre >> 35; |
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return ((pre & 0x07ffffffff) << 5) ^ (-((b >> 0) & 1) & 0x98f2bc8e61UL) ^ |
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(-((b >> 1) & 1) & 0x79b76d99e2UL) ^ |
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(-((b >> 2) & 1) & 0xf33e5fb3c4UL) ^ |
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(-((b >> 3) & 1) & 0xae2eabe2a8UL) ^ |
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(-((b >> 4) & 1) & 0x1e4f43e470UL); |
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} |
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uint64_t PolyMod(uint8_t *prefix, uint8_t *payload, size_t payload_length) { |
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size_t i; |
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uint64_t c = 1; |
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while (*prefix != 0) { |
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c = cashaddr_polymod_step(c) ^ (*prefix++ & 0x1f); // Prefix
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} |
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c = cashaddr_polymod_step(c); // The zero valued separator
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for (i = 0; i < payload_length; ++i) { |
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c = cashaddr_polymod_step(c) ^ (*payload++); // Hash
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} |
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for (i = 0; i < 8; ++i) { |
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c = cashaddr_polymod_step(c); // 8 zeros for empty checksum
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} |
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return c ^ 1; |
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} |
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static int convert_bits(uint8_t *out, size_t *outlen, int outbits, |
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const uint8_t *in, size_t inlen, int inbits, int pad) { |
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uint32_t val = 0; |
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int bits = 0; |
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uint32_t maxv = (((uint32_t)1) << outbits) - 1; |
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while (inlen--) { |
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val = (val << inbits) | *(in++); |
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bits += inbits; |
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while (bits >= outbits) { |
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bits -= outbits; |
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out[(*outlen)++] = (val >> bits) & maxv; |
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} |
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} |
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if (pad) { |
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if (bits) { |
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out[(*outlen)++] = (val << (outbits - bits)) & maxv; |
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} |
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} else if (((val << (outbits - bits)) & maxv) || bits >= inbits) { |
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return 0; |
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} |
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return 1; |
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} |
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void create_checksum(uint8_t *payload, size_t payload_length, |
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uint8_t *checksum) { |
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uint8_t *prefix = (uint8_t *)"bitcoincash"; |
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uint64_t mod = PolyMod(prefix, payload, payload_length); |
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for (size_t i = 0; i < 8; ++i) { |
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// Convert the 5-bit groups in mod to checksum values.
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*checksum++ = (mod >> (5 * (7 - i))) & 0x1f; |
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} |
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} |
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int cashaddr_encode(uint8_t *hash, const size_t hash_length, uint8_t *addr, |
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const size_t max_addr_len, const unsigned short version) { |
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uint8_t version_byte; |
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uint8_t checksum[8] = {0, 0, 0, 0, 0, 0, 0, 0}; // 5-bit bytes.
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uint8_t |
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tmp[40]; // 8-bit bytes. Should be enough for 1 version byte + 160 bit
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uint8_t payload[40]; // 5-bit bytes. Should be enough for 1 version byte +
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// 160 bit hash
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uint8_t *addr_start; |
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size_t payload_length = 0; |
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size_t addr_length = 0; |
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size_t i; |
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addr_start = addr; |
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*addr_start = 0; |
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if (hash_length != 20) // Only support 160 bit hash
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return 0; |
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if (version == CASHADDR_P2PKH) { // Support P2PKH = 0, P2SH = 1
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version_byte = 0; |
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} else if (version == CASHADDR_P2SH) { |
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version_byte = 8; |
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} else { |
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return 0; |
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} |
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tmp[0] = version_byte; |
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os_memmove(tmp + 1, hash, hash_length); |
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convert_bits(payload, &payload_length, 5, tmp, hash_length + 1, 8, 1); |
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create_checksum(payload, payload_length, |
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checksum); // Assume prefix is 'bitcoincash'
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for (i = 0; i < payload_length; ++i) { |
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if (*payload >> 5) { |
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*addr_start = 0; |
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return 0; |
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} |
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addr_length++; |
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if (max_addr_len < addr_length) { |
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*addr_start = 0; |
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return 0; |
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} |
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*(addr++) = charset[payload[i]]; |
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} |
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for (i = 0; i < 8; ++i) { |
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if (*checksum >> 5) { |
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*addr_start = 0; |
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return 0; |
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} |
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addr_length++; |
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if (max_addr_len < addr_length) { |
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*addr_start = 0; |
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return 0; |
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} |
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*(addr++) = charset[checksum[i]]; |
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} |
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*addr = 0; |
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return addr_length; |
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} |
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@ -0,0 +1,48 @@ |
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/* Copyright (c) 2017 Pieter Wuille
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* Modified work Copyright (c) 2018 Jonas Karlsson |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy |
|||
* of this software and associated documentation files (the "Software"), to deal |
|||
* in the Software without restriction, including without limitation the rights |
|||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
|||
* copies of the Software, and to permit persons to whom the Software is |
|||
* furnished to do so, subject to the following conditions: |
|||
* |
|||
* The above copyright notice and this permission notice shall be included in |
|||
* all copies or substantial portions of the Software. |
|||
* |
|||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
|||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
|||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
|||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
|||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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* THE SOFTWARE. |
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*/ |
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#ifndef _CASHADDR_H_ |
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#define _CASHADDR_H_ 1 |
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#include <stdint.h> |
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#define CASHADDR_P2PKH 0 |
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#define CASHADDR_P2SH 1 |
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/** Encode a Bitcoin Cash address
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* |
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* In: hash: Pointer to the hash |
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* hash_length: Length of hash (bytes). Only 20 bytes (160 bits) |
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* supported. |
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* max_addr_len: Maximum length of encoded address |
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* version: P2PKH = 0, P2SH = 1 |
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* |
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* Out: addr: Pointer to a buffer with encoded address. The encoded |
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* address end with a '\0'. |
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* |
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* Returns the length of the address if successful, 0 if unsuccessful. |
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*/ |
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int cashaddr_encode(uint8_t *hash, const size_t hash_length, uint8_t *addr, |
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const size_t max_addr_len, const unsigned short version); |
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#endif |
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