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117 changes: 117 additions & 0 deletions
117
syncany-util/src/main/java/org/syncany/util/Base58.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,117 @@ | ||
| /* | ||
| * Syncany, www.syncany.org | ||
| * Copyright (C) 2011-2014 Philipp C. Heckel <philipp.heckel@gmail.com> | ||
| * | ||
| * This program is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
| */ | ||
| package org.syncany.util; | ||
|
|
||
| import java.math.BigInteger; | ||
|
|
||
| /** | ||
| * base58 encoding | ||
| * @author Vincent Wiencek <vwiencek@gmail.com> | ||
| */ | ||
| public class Base58 { | ||
|
|
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| private static final String Alphabet = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz"; | ||
| private static final BigInteger Base58 = new BigInteger("58", 10); | ||
|
|
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| public static String encode(byte[] indata) { | ||
| byte[] data = new byte[indata.length]; | ||
| System.arraycopy(indata, 0, data, 0, data.length); | ||
| // convert big endian data to little endian | ||
| int len = data.length; | ||
| int mid = len / 2; | ||
| int i; | ||
| for (i = 0; i < mid; i++) { | ||
| byte tmp = data[i]; | ||
| data[i] = data[len - 1 - i]; | ||
| data[len - 1 - i] = tmp; | ||
| } | ||
| BigInteger value = new BigInteger(1, data); | ||
| StringBuilder result = new StringBuilder(); | ||
|
|
||
| // divide until zero | ||
| while (value.compareTo(BigInteger.ZERO) > 0) { | ||
| BigInteger[] qr = value.divideAndRemainder(Base58); | ||
| value = qr[0]; | ||
| BigInteger rem = qr[1]; | ||
| result.append(Alphabet.charAt(rem.intValue())); | ||
| } | ||
| // append leading zeros | ||
| for (i = 0; i < len; i++) { | ||
| if (data[i] == 0) { | ||
| result.append(Alphabet.charAt(0)); | ||
| } | ||
| else { | ||
| break; | ||
| } | ||
| } | ||
| // reverse to big endian | ||
| len = result.length(); | ||
| mid = len / 2; | ||
| for (i = 0; i < mid; i++) { | ||
| char ch1 = result.charAt(i); | ||
| char ch2 = result.charAt(len - 1 - i); | ||
| result.setCharAt(len - 1 - i, ch1); | ||
| result.setCharAt(i, ch2); | ||
| } | ||
| return result.toString(); | ||
| } | ||
|
|
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| public static byte[] decode(String data) { | ||
| BigInteger value = BigInteger.ZERO; | ||
| BigInteger character; | ||
| // eat spaces | ||
| data = data.trim(); | ||
| // encode to big number | ||
| int i; | ||
| int len = data.length(); | ||
| for (i = 0; i < len; i++) { | ||
| int pos = Alphabet.indexOf(data.charAt(i)); | ||
| if (pos < 0) { // not a valid char | ||
| return null; | ||
| } | ||
| character = new BigInteger(String.valueOf(pos), 10); | ||
| value = value.multiply(Base58); | ||
| value = value.add(character); | ||
| } | ||
|
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| byte[] dec = value.toByteArray(); | ||
| int declen = dec.length; | ||
| int decoff = 0; | ||
| // strip sign byte | ||
| if (dec.length > 2 && dec[0] == 0 && (dec[1] & 0x80) == 0x80) { | ||
| declen--; | ||
| decoff++; | ||
| } | ||
| // count leading zeros | ||
| int n = 0; | ||
| for (i = 0; i < len; i++) { | ||
| if (data.charAt(i) == Alphabet.charAt(0)) { | ||
| n++; | ||
| } | ||
| else { | ||
| break; | ||
| } | ||
| } | ||
| // reverse result at the right place | ||
| byte[] result = new byte[declen + n]; | ||
| for (i = 0; i < declen; i++) { | ||
| result[i] = dec[(declen - 1 - i) + decoff]; | ||
| } | ||
| return result; | ||
| } | ||
| } |
36 changes: 36 additions & 0 deletions
36
syncany-util/src/test/java/org/syncany/tests/util/Base58Test.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,36 @@ | ||
| /* | ||
| * Syncany, www.syncany.org | ||
| * Copyright (C) 2011-2014 Philipp C. Heckel <philipp.heckel@gmail.com> | ||
| * | ||
| * This program is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
| */ | ||
| package org.syncany.tests.util; | ||
|
|
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| import static org.junit.Assert.assertTrue; | ||
|
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| import java.util.Arrays; | ||
|
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| import org.junit.Test; | ||
| import org.syncany.util.Base58; | ||
|
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| public class Base58Test { | ||
|
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| @Test | ||
| public void testGetRelativePath() { | ||
| byte[] testString = "life is easy with eyes closed".getBytes(); | ||
| byte[] decodedString = Base58.decode(Base58.encode(testString)); | ||
|
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| assertTrue(Arrays.equals(testString, decodedString)); | ||
| } | ||
| } |