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@@ -0,0 +1,275 @@
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+package com.uas.account.sso.integration.crypto.base64;
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+
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+import java.io.IOException;
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+import java.io.OutputStream;
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+
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+/**
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+ * Created by Pro1 on 2018/1/26.
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+ */
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+public class UrlBase64Encoder {
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+ protected final byte[] encodingTable = { (byte) 'A', (byte) 'B', (byte) 'C', (byte) 'D', (byte) 'E', (byte) 'F', (byte) 'G',
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+ (byte) 'H', (byte) 'I', (byte) 'J', (byte) 'K', (byte) 'L', (byte) 'M', (byte) 'N', (byte) 'O', (byte) 'P', (byte) 'Q',
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+ (byte) 'R', (byte) 'S', (byte) 'T', (byte) 'U', (byte) 'V', (byte) 'W', (byte) 'X', (byte) 'Y', (byte) 'Z', (byte) 'a',
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+ (byte) 'b', (byte) 'c', (byte) 'd', (byte) 'e', (byte) 'f', (byte) 'g', (byte) 'h', (byte) 'i', (byte) 'j', (byte) 'k',
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+ (byte) 'l', (byte) 'm', (byte) 'n', (byte) 'o', (byte) 'p', (byte) 'q', (byte) 'r', (byte) 's', (byte) 't', (byte) 'u',
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+ (byte) 'v', (byte) 'w', (byte) 'x', (byte) 'y', (byte) 'z', (byte) '0', (byte) '1', (byte) '2', (byte) '3', (byte) '4',
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+ (byte) '5', (byte) '6', (byte) '7', (byte) '8', (byte) '9', (byte) '-', (byte) '_' };
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+
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+ protected byte padding = (byte) '.';
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+
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+ /*
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+ * set up the decoding table.
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+ */
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+ protected final byte[] decodingTable = new byte[128];
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+
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+ protected void initialiseDecodingTable() {
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+ for (int i = 0; i < decodingTable.length; i++) {
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+ decodingTable[i] = (byte) 0xff;
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+ }
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+
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+ for (int i = 0; i < encodingTable.length; i++) {
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+ decodingTable[encodingTable[i]] = (byte) i;
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+ }
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+ }
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+
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+ public UrlBase64Encoder() {
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+ initialiseDecodingTable();
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+ }
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+
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+ /**
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+ * encode the input data producing a base 64 output stream.
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+ *
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+ * @return the number of bytes produced.
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+ */
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+ public int encode(byte[] data, int off, int length, OutputStream out) throws IOException {
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+ int modulus = length % 3;
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+ int dataLength = (length - modulus);
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+ int a1, a2, a3;
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+
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+ for (int i = off; i < off + dataLength; i += 3) {
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+ a1 = data[i] & 0xff;
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+ a2 = data[i + 1] & 0xff;
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+ a3 = data[i + 2] & 0xff;
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+
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+ out.write(encodingTable[(a1 >>> 2) & 0x3f]);
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+ out.write(encodingTable[((a1 << 4) | (a2 >>> 4)) & 0x3f]);
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+ out.write(encodingTable[((a2 << 2) | (a3 >>> 6)) & 0x3f]);
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+ out.write(encodingTable[a3 & 0x3f]);
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+ }
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+
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+ /*
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+ * process the tail end.
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+ */
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+ int b1, b2, b3;
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+ int d1, d2;
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+
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+ switch (modulus) {
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+ case 0: /* nothing left to do */
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+ break;
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+ case 1:
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+ d1 = data[off + dataLength] & 0xff;
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+ b1 = (d1 >>> 2) & 0x3f;
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+ b2 = (d1 << 4) & 0x3f;
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+
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+ out.write(encodingTable[b1]);
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+ out.write(encodingTable[b2]);
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+ out.write(padding);
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+ out.write(padding);
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+ break;
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+ case 2:
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+ d1 = data[off + dataLength] & 0xff;
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+ d2 = data[off + dataLength + 1] & 0xff;
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+
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+ b1 = (d1 >>> 2) & 0x3f;
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+ b2 = ((d1 << 4) | (d2 >>> 4)) & 0x3f;
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+ b3 = (d2 << 2) & 0x3f;
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+
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+ out.write(encodingTable[b1]);
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+ out.write(encodingTable[b2]);
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+ out.write(encodingTable[b3]);
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+ out.write(padding);
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+ break;
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+ }
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+
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+ return (dataLength / 3) * 4 + ((modulus == 0) ? 0 : 4);
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+ }
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+
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+ private boolean ignore(char c) {
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+ return (c == '\n' || c == '\r' || c == '\t' || c == ' ');
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+ }
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+
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+ /**
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+ * decode the base 64 encoded byte data writing it to the given output
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+ * stream, whitespace characters will be ignored.
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+ *
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+ * @return the number of bytes produced.
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+ */
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+ public int decode(byte[] data, int off, int length, OutputStream out) throws IOException {
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+ byte b1, b2, b3, b4;
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+ int outLen = 0;
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+
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+ int end = off + length;
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+
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+ while (end > off) {
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+ if (!ignore((char) data[end - 1])) {
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+ break;
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+ }
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+
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+ end--;
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+ }
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+
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+ int i = off;
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+ int finish = end - 4;
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+
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+ i = nextI(data, i, finish);
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+
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+ while (i < finish) {
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+ b1 = decodingTable[data[i++]];
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+
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+ i = nextI(data, i, finish);
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+
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+ b2 = decodingTable[data[i++]];
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+
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+ i = nextI(data, i, finish);
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+
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+ b3 = decodingTable[data[i++]];
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+
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+ i = nextI(data, i, finish);
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+
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+ b4 = decodingTable[data[i++]];
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+
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+ if ((b1 | b2 | b3 | b4) < 0) {
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+ throw new IOException("invalid characters encountered in base64 data");
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+ }
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+
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+ out.write((b1 << 2) | (b2 >> 4));
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+ out.write((b2 << 4) | (b3 >> 2));
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+ out.write((b3 << 6) | b4);
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+
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+ outLen += 3;
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+
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+ i = nextI(data, i, finish);
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+ }
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+
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+ outLen += decodeLastBlock(out, (char) data[end - 4], (char) data[end - 3], (char) data[end - 2], (char) data[end - 1]);
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+
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+ return outLen;
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+ }
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+
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+ private int nextI(byte[] data, int i, int finish) {
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+ while ((i < finish) && ignore((char) data[i])) {
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+ i++;
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+ }
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+ return i;
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+ }
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+
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+ /**
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+ * decode the base 64 encoded String data writing it to the given output
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+ * stream, whitespace characters will be ignored.
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+ *
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+ * @return the number of bytes produced.
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+ */
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+ public int decode(String data, OutputStream out) throws IOException {
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+ byte b1, b2, b3, b4;
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+ int length = 0;
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+
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+ int end = data.length();
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+
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+ while (end > 0) {
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+ if (!ignore(data.charAt(end - 1))) {
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+ break;
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+ }
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+
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+ end--;
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+ }
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+
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+ int i = 0;
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+ int finish = end - 4;
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+
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+ i = nextI(data, i, finish);
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+
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+ while (i < finish) {
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+ b1 = decodingTable[data.charAt(i++)];
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+
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+ i = nextI(data, i, finish);
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+
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+ b2 = decodingTable[data.charAt(i++)];
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+
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+ i = nextI(data, i, finish);
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+
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+ b3 = decodingTable[data.charAt(i++)];
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+
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+ i = nextI(data, i, finish);
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+
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+ b4 = decodingTable[data.charAt(i++)];
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+
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+ if ((b1 | b2 | b3 | b4) < 0) {
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+ throw new IOException("invalid characters encountered in base64 data");
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+ }
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+
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+ out.write((b1 << 2) | (b2 >> 4));
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+ out.write((b2 << 4) | (b3 >> 2));
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+ out.write((b3 << 6) | b4);
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+
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+ length += 3;
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+
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+ i = nextI(data, i, finish);
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+ }
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+
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+ length += decodeLastBlock(out, data.charAt(end - 4), data.charAt(end - 3), data.charAt(end - 2), data.charAt(end - 1));
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+
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+ return length;
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+ }
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+
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+ private int decodeLastBlock(OutputStream out, char c1, char c2, char c3, char c4) throws IOException {
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+ byte b1, b2, b3, b4;
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+
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+ if (c3 == padding) {
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+ b1 = decodingTable[c1];
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+ b2 = decodingTable[c2];
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+
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+ if ((b1 | b2) < 0) {
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+ throw new IOException("invalid characters encountered at end of base64 data");
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+ }
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+
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+ out.write((b1 << 2) | (b2 >> 4));
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+
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+ return 1;
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+ } else if (c4 == padding) {
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+ b1 = decodingTable[c1];
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+ b2 = decodingTable[c2];
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+ b3 = decodingTable[c3];
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+
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+ if ((b1 | b2 | b3) < 0) {
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+ throw new IOException("invalid characters encountered at end of base64 data");
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+ }
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+
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+ out.write((b1 << 2) | (b2 >> 4));
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+ out.write((b2 << 4) | (b3 >> 2));
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+
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+ return 2;
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+ } else {
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+ b1 = decodingTable[c1];
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+ b2 = decodingTable[c2];
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+ b3 = decodingTable[c3];
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+ b4 = decodingTable[c4];
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+
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+ if ((b1 | b2 | b3 | b4) < 0) {
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+ throw new IOException("invalid characters encountered at end of base64 data");
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+ }
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+
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+ out.write((b1 << 2) | (b2 >> 4));
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+ out.write((b2 << 4) | (b3 >> 2));
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+ out.write((b3 << 6) | b4);
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+
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+ return 3;
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+ }
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+ }
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+
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+ private int nextI(String data, int i, int finish) {
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+ while ((i < finish) && ignore(data.charAt(i))) {
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+ i++;
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+ }
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+ return i;
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+ }
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+}
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