64 lines
2.6 KiB
Java
64 lines
2.6 KiB
Java
private final static String ALPHABET = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz";
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public static void main(String[] args) {
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Assert("Test 01", ValidateBitcoinAddress("1AGNa15ZQXAZUgFiqJ2i7Z2DPU2J6hW62i"), true);
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Assert("Test 02", ValidateBitcoinAddress("1AGNa15ZQXAZUgFiqJ2i7Z2DPU2J6hW62j"), false);
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Assert("Test 03", ValidateBitcoinAddress("1Q1pE5vPGEEMqRcVRMbtBK842Y6Pzo6nK9"), true);
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Assert("Test 04", ValidateBitcoinAddress("1AGNa15ZQXAZUgFiqJ2i7Z2DPU2J6hW62X"), false);
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Assert("Test 05", ValidateBitcoinAddress("1ANNa15ZQXAZUgFiqJ2i7Z2DPU2J6hW62i"), false);
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Assert("Test 06", ValidateBitcoinAddress("1A Na15ZQXAZUgFiqJ2i7Z2DPU2J6hW62i"), false);
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Assert("Test 07", ValidateBitcoinAddress("BZbvjr"), false);
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Assert("Test 08", ValidateBitcoinAddress("i55j"), false);
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Assert("Test 09", ValidateBitcoinAddress("1AGNa15ZQXAZUgFiqJ2i7Z2DPU2J6hW62!"), false);
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Assert("Test 10", ValidateBitcoinAddress("1AGNa15ZQXAZUgFiqJ2i7Z2DPU2J6hW62iz"), false);
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Assert("Test 11", ValidateBitcoinAddress("1AGNa15ZQXAZUgFiqJ2i7Z2DPU2J6hW62izz"), false);
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Assert("Test 12", ValidateBitcoinAddress("1Q1pE5vPGEEMqRcVRMbtBK842Y6Pzo6nJ9"), false);
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Assert("Test 13", ValidateBitcoinAddress("1AGNa15ZQXAZUgFiqJ2i7Z2DPU2J6hW62I"), false);
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}
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public static boolean ValidateBitcoinAddress(String addr) {
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if (addr.length() < 26 || addr.length() > 35) return false;
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byte[] decoded = DecodeBase58(addr, 58, 25);
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if (decoded == null) return false;
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byte[] hash = Sha256(decoded, 0, 21, 2);
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return Arrays.equals(Arrays.copyOfRange(hash, 0, 4), Arrays.copyOfRange(decoded, 21, 25));
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}
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private static byte[] DecodeBase58(String input, int base, int len) {
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byte[] output = new byte[len];
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for (int i = 0; i < input.length(); i++) {
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char t = input.charAt(i);
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int p = ALPHABET.indexOf(t);
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if (p == -1) return null;
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for (int j = len - 1; j > 0; j--, p /= 256) {
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p += base * (output[j] & 0xFF);
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output[j] = (byte) (p % 256);
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}
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if (p != 0) return null;
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}
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return output;
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}
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private static byte[] Sha256(byte[] data, int start, int len, int recursion) {
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if (recursion == 0) return data;
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try {
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MessageDigest md = MessageDigest.getInstance("SHA-256");
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md.update(Arrays.copyOfRange(data, start, start + len));
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return Sha256(md.digest(), 0, 32, recursion - 1);
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} catch (NoSuchAlgorithmException e) {
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return null;
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}
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}
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public static void Assert(String name, boolean value, boolean expected) {
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if (value ^ expected)
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throw new Error("Test " + name + " failed");
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else
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System.out.println(name + " passed");
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}
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