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WIP Add SegwitAddress as a subclass of AbstractAddress (parent of Add…
…ress too). Note the class names a subject to change, e.g. AbstractAddress > Address Address > LegacyAddress Uses Bech32 code from sipa/bech32#40.
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Andreas Schildbach
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Feb 21, 2018
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/* | ||
* Copyright 2018 Andreas Schildbach | ||
* | ||
* Licensed 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. | ||
*/ | ||
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package org.bitcoinj.core; | ||
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import javax.annotation.Nullable; | ||
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public class AbstractAddress extends VersionedChecksummedBytes { | ||
public AbstractAddress(NetworkParameters params, byte[] bytes) { | ||
super(params, bytes); | ||
} | ||
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/** | ||
* Construct an address from its textual representation. | ||
* | ||
* @param params | ||
* The expected NetworkParameters or null if you don't want validation. | ||
* @param str | ||
* The textual form of the address, such as "17kzeh4N8g49GFvdDzSf8PjaPfyoD1MndL". | ||
* @throws AddressFormatException | ||
* if the given string doesn't parse or the checksum is invalid | ||
* @throws WrongNetworkException | ||
* if the given string is valid but for a different chain (eg testnet vs mainnet) | ||
*/ | ||
public static AbstractAddress fromString(@Nullable NetworkParameters params, String str) | ||
throws AddressFormatException { | ||
try { | ||
return Address.fromBase58(params, str); | ||
} catch (WrongNetworkException x) { | ||
throw x; | ||
} catch (AddressFormatException x) { | ||
try { | ||
return SegwitAddress.fromBech32(params, str); | ||
} catch (WrongNetworkException x2) { | ||
throw x; | ||
} catch (AddressFormatException x2) { | ||
throw new AddressFormatException(str); | ||
} | ||
} | ||
} | ||
} |
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/* Copyright (c) 2018 Coinomi Ltd | ||
* | ||
* 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, | ||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | ||
* THE SOFTWARE. | ||
*/ | ||
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package org.bitcoinj.core; | ||
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import java.util.Arrays; | ||
import java.util.Locale; | ||
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public class Bech32 { | ||
/** The Bech32 character set for encoding. */ | ||
private static final String CHARSET = "qpzry9x8gf2tvdw0s3jn54khce6mua7l"; | ||
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/** The Bech32 character set for decoding. */ | ||
private static final byte[] CHARSET_REV = { | ||
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, | ||
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, | ||
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, | ||
15, -1, 10, 17, 21, 20, 26, 30, 7, 5, -1, -1, -1, -1, -1, -1, | ||
-1, 29, -1, 24, 13, 25, 9, 8, 23, -1, 18, 22, 31, 27, 19, -1, | ||
1, 0, 3, 16, 11, 28, 12, 14, 6, 4, 2, -1, -1, -1, -1, -1, | ||
-1, 29, -1, 24, 13, 25, 9, 8, 23, -1, 18, 22, 31, 27, 19, -1, | ||
1, 0, 3, 16, 11, 28, 12, 14, 6, 4, 2, -1, -1, -1, -1, -1 | ||
}; | ||
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public static class Bech32Data { | ||
final String hrp; | ||
final byte[] values; | ||
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private Bech32Data(final String hrp, final byte[] values) { | ||
this.hrp = hrp; | ||
this.values = values; | ||
} | ||
} | ||
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/** Find the polynomial with value coefficients mod the generator as 30-bit. */ | ||
private static int polymod(final byte[] values) { | ||
int c = 1; | ||
for (byte v_i: values) { | ||
int c0 = (c >>> 25) & 0xff; | ||
c = ((c & 0x1ffffff) << 5) ^ (v_i & 0xff); | ||
if ((c0 & 1) != 0) c ^= 0x3b6a57b2; | ||
if ((c0 & 2) != 0) c ^= 0x26508e6d; | ||
if ((c0 & 4) != 0) c ^= 0x1ea119fa; | ||
if ((c0 & 8) != 0) c ^= 0x3d4233dd; | ||
if ((c0 & 16) != 0) c ^= 0x2a1462b3; | ||
} | ||
return c; | ||
} | ||
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/** Expand a HRP for use in checksum computation. */ | ||
private static byte[] expandHrp(final String hrp) { | ||
int hrpLength = hrp.length(); | ||
byte ret[] = new byte[hrpLength * 2 + 1]; | ||
for (int i = 0; i < hrpLength; ++i) { | ||
int c = hrp.charAt(i) & 0x7f; // Limit to standard 7-bit ASCII | ||
ret[i] = (byte) ((c >>> 5) & 0x07); | ||
ret[i + hrpLength + 1] = (byte) (c & 0x1f); | ||
} | ||
ret[hrpLength] = 0; | ||
return ret; | ||
} | ||
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/** Verify a checksum. */ | ||
private static boolean verifyChecksum(final String hrp, final byte[] values) { | ||
byte[] hrpExpanded = expandHrp(hrp); | ||
byte[] combined = new byte[hrpExpanded.length + values.length]; | ||
System.arraycopy(hrpExpanded, 0, combined, 0, hrpExpanded.length); | ||
System.arraycopy(values, 0, combined, hrpExpanded.length, values.length); | ||
return polymod(combined) == 1; | ||
} | ||
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/** Create a checksum. */ | ||
private static byte[] createChecksum(final String hrp, final byte[] values) { | ||
byte[] hrpExpanded = expandHrp(hrp); | ||
byte[] enc = new byte[hrpExpanded.length + values.length + 6]; | ||
System.arraycopy(hrpExpanded, 0, enc, 0, hrpExpanded.length); | ||
System.arraycopy(values, 0, enc, hrpExpanded.length, values.length); | ||
int mod = polymod(enc) ^ 1; | ||
byte[] ret = new byte[6]; | ||
for (int i = 0; i < 6; ++i) { | ||
ret[i] = (byte) ((mod >>> (5 * (5 - i))) & 31); | ||
} | ||
return ret; | ||
} | ||
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/** Encode a Bech32 string. */ | ||
public static String encode(final Bech32Data bech32) throws AddressFormatException { | ||
return encode(bech32.hrp, bech32.values); | ||
} | ||
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/** Encode a Bech32 string. */ | ||
public static String encode(String hrp, final byte[] values) throws AddressFormatException { | ||
if (hrp.length() < 1) throw new AddressFormatException("Human-readable part is too short"); | ||
if (hrp.length() > 83) throw new AddressFormatException("Human-readable part is too long"); | ||
hrp = hrp.toLowerCase(Locale.ROOT); | ||
byte[] checksum = createChecksum(hrp, values); | ||
byte[] combined = new byte[values.length + checksum.length]; | ||
System.arraycopy(values, 0, combined, 0, values.length); | ||
System.arraycopy(checksum, 0, combined, values.length, checksum.length); | ||
StringBuilder sb = new StringBuilder(hrp.length() + 1 + combined.length); | ||
sb.append(hrp); | ||
sb.append('1'); | ||
for (byte b : combined) { | ||
sb.append(CHARSET.charAt(b)); | ||
} | ||
return sb.toString(); | ||
} | ||
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/** Decode a Bech32 string. */ | ||
public static Bech32Data decode(final String str) throws AddressFormatException { | ||
boolean lower = false, upper = false; | ||
if (str.length() < 8) throw new AddressFormatException("Input too short"); | ||
if (str.length() > 90) throw new AddressFormatException("Input too long"); | ||
for (int i = 0; i < str.length(); ++i) { | ||
char c = str.charAt(i); | ||
if (c < 33 || c > 126) throw new AddressFormatException("Characters out of range"); | ||
if (c >= 'a' && c <= 'z') lower = true; | ||
if (c >= 'A' && c <= 'Z') upper = true; | ||
} | ||
if (lower && upper) throw new AddressFormatException("Cannot mix upper and lower cases"); | ||
int pos = str.lastIndexOf('1'); | ||
if (pos < 1) throw new AddressFormatException("Missing human-readable part"); | ||
if (pos + 7 > str.length()) throw new AddressFormatException("Data part too short"); | ||
byte[] values = new byte[str.length() - 1 - pos]; | ||
for (int i = 0; i < str.length() - 1 - pos; ++i) { | ||
char c = str.charAt(i + pos + 1); | ||
if (CHARSET_REV[c] == -1) throw new AddressFormatException("Characters out of range"); | ||
values[i] = CHARSET_REV[c]; | ||
} | ||
String hrp = str.substring(0, pos).toLowerCase(Locale.ROOT); | ||
if (!verifyChecksum(hrp, values)) throw new AddressFormatException("Invalid checksum"); | ||
return new Bech32Data(hrp, Arrays.copyOfRange(values, 0, values.length - 6)); | ||
} | ||
} |
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