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// SPDX-FileCopyrightText: 2006 Istituto Nazionale di Fisica Nucleare
//
// SPDX-License-Identifier: Apache-2.0
package org.italiangrid.voms.util;
// Gidon Moont
// Imperial College London
// Copyright (C) April 2006
// Voms uses a non-standard Base-64 algorithm. Hmmm...
import org.bouncycastle.util.encoders.Base64;
/**
*
* This class implements a decoder for the non-standard Base-64 algorithm used
* by voms.
*
*
* @author Gidon Moont
* @author Vincenzo Ciaschini
*
*/
public class VOMSBase64Decoder {
// matrix out of src/common/xml.c
private static int[] decodemapint = new int[] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 52, 53, 54, 55, 56, 57, 58, 59, 60,
61, 0, 0, 0, 0, 0, 0, 0, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37,
38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 62, 0, 63, 0, 0, 0,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20,
21, 22, 23, 24, 25, 0, 0, 0, 0, 0 };
private static byte[] decodemapbyte = new byte[128];
static {
for (int i = 0; i < 128; i++) {
decodemapbyte[i] = (byte) decodemapint[i];
}
}
public static byte[] decode(String s) {
if (s.indexOf('\n') != -1) {
return Base64.decode(s.trim().replaceAll("\n", ""));
} else
return mydecode(s);
}
private static byte[] mydecode(String s) {
char[] in = s.toCharArray();
int iLen = in.length;
// cuts off end - do I need this?
// while (iLen > 0 && in[iLen-1] == '=') iLen--;
int oLen = (iLen * 3) / 4;
byte[] out = new byte[oLen];
int ip = 0;
int op = 0;
while (ip < iLen) {
int i0 = in[ip++];
int i1 = in[ip++];
int i2 = ip < iLen ? in[ip++] : 'A';
int i3 = ip < iLen ? in[ip++] : 'A';
if (i0 > 127 || i1 > 127 || i2 > 127 || i3 > 127)
throw new IllegalArgumentException(
"Illegal character in Base64 encoded data.");
int b0 = decodemapbyte[i0];
int b1 = decodemapbyte[i1];
int b2 = decodemapbyte[i2];
int b3 = decodemapbyte[i3];
if (b0 < 0 || b1 < 0 || b2 < 0 || b3 < 0)
throw new IllegalArgumentException(
"Illegal character in Base64 encoded data.");
// ????????????
int o0 = (b0 << 2) | (b1 >>> 4);
int o1 = ((b1 & 0xf) << 4) | (b2 >>> 2);
int o2 = ((b2 & 3) << 6) | b3;
out[op++] = (byte) o0;
if (op < oLen)
out[op++] = (byte) o1;
if (op < oLen)
out[op++] = (byte) o2;
}
return out;
}
}
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