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package com.techery.droid.billings.utils; //ww w .j a v a 2s . c om public class Base64 { /** Specify encoding (value is {@code true}). */ public final static boolean ENCODE = true; /** Specify decoding (value is {@code false}). */ public final static boolean DECODE = false; /** The equals sign (=) as a byte. */ private final static byte EQUALS_SIGN = (byte) '='; /** The new line character (\n) as a byte. */ private final static byte NEW_LINE = (byte) '\n'; /** * The 64 valid Base64 values. */ private final static byte[] ALPHABET = {(byte) 'A', (byte) 'B', (byte) 'C', (byte) 'D', (byte) 'E', (byte) 'F', (byte) 'G', (byte) 'H', (byte) 'I', (byte) 'J', (byte) 'K', (byte) 'L', (byte) 'M', (byte) 'N', (byte) 'O', (byte) 'P', (byte) 'Q', (byte) 'R', (byte) 'S', (byte) 'T', (byte) 'U', (byte) 'V', (byte) 'W', (byte) 'X', (byte) 'Y', (byte) 'Z', (byte) 'a', (byte) 'b', (byte) 'c', (byte) 'd', (byte) 'e', (byte) 'f', (byte) 'g', (byte) 'h', (byte) 'i', (byte) 'j', (byte) 'k', (byte) 'l', (byte) 'm', (byte) 'n', (byte) 'o', (byte) 'p', (byte) 'q', (byte) 'r', (byte) 's', (byte) 't', (byte) 'u', (byte) 'v', (byte) 'w', (byte) 'x', (byte) 'y', (byte) 'z', (byte) '0', (byte) '1', (byte) '2', (byte) '3', (byte) '4', (byte) '5', (byte) '6', (byte) '7', (byte) '8', (byte) '9', (byte) '+', (byte) '/'}; /** * The 64 valid web safe Base64 values. */ private final static byte[] WEBSAFE_ALPHABET = {(byte) 'A', (byte) 'B', (byte) 'C', (byte) 'D', (byte) 'E', (byte) 'F', (byte) 'G', (byte) 'H', (byte) 'I', (byte) 'J', (byte) 'K', (byte) 'L', (byte) 'M', (byte) 'N', (byte) 'O', (byte) 'P', (byte) 'Q', (byte) 'R', (byte) 'S', (byte) 'T', (byte) 'U', (byte) 'V', (byte) 'W', (byte) 'X', (byte) 'Y', (byte) 'Z', (byte) 'a', (byte) 'b', (byte) 'c', (byte) 'd', (byte) 'e', (byte) 'f', (byte) 'g', (byte) 'h', (byte) 'i', (byte) 'j', (byte) 'k', (byte) 'l', (byte) 'm', (byte) 'n', (byte) 'o', (byte) 'p', (byte) 'q', (byte) 'r', (byte) 's', (byte) 't', (byte) 'u', (byte) 'v', (byte) 'w', (byte) 'x', (byte) 'y', (byte) 'z', (byte) '0', (byte) '1', (byte) '2', (byte) '3', (byte) '4', (byte) '5', (byte) '6', (byte) '7', (byte) '8', (byte) '9', (byte) '-', (byte) '_'}; /** * Translates a Base64 value to either its 6-bit reconstruction value * or a negative number indicating some other meaning. **/ private final static byte[] DECODABET = {-9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 0 - 8 -5, -5, // Whitespace: Tab and Linefeed -9, -9, // Decimal 11 - 12 -5, // Whitespace: Carriage Return -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 14 - 26 -9, -9, -9, -9, -9, // Decimal 27 - 31 -5, // Whitespace: Space -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 33 - 42 62, // Plus sign at decimal 43 -9, -9, -9, // Decimal 44 - 46 63, // Slash at decimal 47 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, // Numbers zero through nine -9, -9, -9, // Decimal 58 - 60 -1, // Equals sign at decimal 61 -9, -9, -9, // Decimal 62 - 64 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, // Letters 'A' through 'N' 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, // Letters 'O' through 'Z' -9, -9, -9, -9, -9, -9, // Decimal 91 - 96 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, // Letters 'a' through 'm' 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, // Letters 'n' through 'z' -9, -9, -9, -9, -9 // Decimal 123 - 127 /* ,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 128 - 139 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 140 - 152 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 153 - 165 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 166 - 178 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 179 - 191 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 192 - 204 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 205 - 217 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 218 - 230 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 231 - 243 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9 // Decimal 244 - 255 */ }; /** The web safe decodabet */ private final static byte[] WEBSAFE_DECODABET = {-9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 0 - 8 -5, -5, // Whitespace: Tab and Linefeed -9, -9, // Decimal 11 - 12 -5, // Whitespace: Carriage Return -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 14 - 26 -9, -9, -9, -9, -9, // Decimal 27 - 31 -5, // Whitespace: Space -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 33 - 44 62, // Dash '-' sign at decimal 45 -9, -9, // Decimal 46-47 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, // Numbers zero through nine -9, -9, -9, // Decimal 58 - 60 -1, // Equals sign at decimal 61 -9, -9, -9, // Decimal 62 - 64 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, // Letters 'A' through 'N' 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, // Letters 'O' through 'Z' -9, -9, -9, -9, // Decimal 91-94 63, // Underscore '_' at decimal 95 -9, // Decimal 96 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, // Letters 'a' through 'm' 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, // Letters 'n' through 'z' -9, -9, -9, -9, -9 // Decimal 123 - 127 /* ,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 128 - 139 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 140 - 152 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 153 - 165 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 166 - 178 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 179 - 191 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 192 - 204 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 205 - 217 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 218 - 230 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 231 - 243 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9 // Decimal 244 - 255 */ }; // Indicates white space in encoding private final static byte WHITE_SPACE_ENC = -5; // Indicates equals sign in encoding private final static byte EQUALS_SIGN_ENC = -1; /** Defeats instantiation. */ private Base64() { } /* ******** E N C O D I N G M E T H O D S ******** */ /** * Encodes up to three bytes of the array <var>source</var> * and writes the resulting four Base64 bytes to <var>destination</var>. * The source and destination arrays can be manipulated * anywhere along their length by specifying * <var>srcOffset</var> and <var>destOffset</var>. * This method does not check to make sure your arrays * are large enough to accommodate <var>srcOffset</var> + 3 for * the <var>source</var> array or <var>destOffset</var> + 4 for * the <var>destination</var> array. * The actual number of significant bytes in your array is * given by <var>numSigBytes</var>. * * @param source the array to convert * @param srcOffset the index where conversion begins * @param numSigBytes the number of significant bytes in your array * @param destination the array to hold the conversion * @param destOffset the index where output will be put * @param alphabet is the encoding alphabet * @return the <var>destination</var> array * @since 1.3 */ private static byte[] encode3to4(byte[] source, int srcOffset, int numSigBytes, byte[] destination, int destOffset, byte[] alphabet) { // 1 2 3 // 01234567890123456789012345678901 Bit position // --------000000001111111122222222 Array position from threeBytes // --------| || || || | Six bit groups to index alphabet // >>18 >>12 >> 6 >> 0 Right shift necessary // 0x3f 0x3f 0x3f Additional AND // Create buffer with zero-padding if there are only one or two // significant bytes passed in the array. // We have to shift left 24 in order to flush out the 1's that appear // when Java treats a value as negative that is cast from a byte to an int. int inBuff = (numSigBytes > 0 ? ((source[srcOffset] << 24) >>> 8) : 0) | (numSigBytes > 1 ? ((source[srcOffset + 1] << 24) >>> 16) : 0) | (numSigBytes > 2 ? ((source[srcOffset + 2] << 24) >>> 24) : 0); switch (numSigBytes) { case 3: destination[destOffset] = alphabet[(inBuff >>> 18)]; destination[destOffset + 1] = alphabet[(inBuff >>> 12) & 0x3f]; destination[destOffset + 2] = alphabet[(inBuff >>> 6) & 0x3f]; destination[destOffset + 3] = alphabet[(inBuff) & 0x3f]; return destination; case 2: destination[destOffset] = alphabet[(inBuff >>> 18)]; destination[destOffset + 1] = alphabet[(inBuff >>> 12) & 0x3f]; destination[destOffset + 2] = alphabet[(inBuff >>> 6) & 0x3f]; destination[destOffset + 3] = EQUALS_SIGN; return destination; case 1: destination[destOffset] = alphabet[(inBuff >>> 18)]; destination[destOffset + 1] = alphabet[(inBuff >>> 12) & 0x3f]; destination[destOffset + 2] = EQUALS_SIGN; destination[destOffset + 3] = EQUALS_SIGN; return destination; default: return destination; } // end switch } // end encode3to4 /** * Encodes a byte array into Base64 notation. * Equivalent to calling * {@code encodeBytes(source, 0, source.length)} * * @param source The data to convert * @since 1.4 */ public static String encode(byte[] source) { return encode(source, 0, source.length, ALPHABET, true); } /** * Encodes a byte array into web safe Base64 notation. * * @param source The data to convert * @param doPadding is {@code true} to pad result with '=' chars * if it does not fall on 3 byte boundaries */ public static String encodeWebSafe(byte[] source, boolean doPadding) { return encode(source, 0, source.length, WEBSAFE_ALPHABET, doPadding); } /** * Encodes a byte array into Base64 notation. * * @param source the data to convert * @param off offset in array where conversion should begin * @param len length of data to convert * @param alphabet the encoding alphabet * @param doPadding is {@code true} to pad result with '=' chars * if it does not fall on 3 byte boundaries * @since 1.4 */ public static String encode(byte[] source, int off, int len, byte[] alphabet, boolean doPadding) { byte[] outBuff = encode(source, off, len, alphabet, Integer.MAX_VALUE); int outLen = outBuff.length; // If doPadding is false, set length to truncate '=' // padding characters while (doPadding == false && outLen > 0) { if (outBuff[outLen - 1] != '=') { break; } outLen -= 1; } return new String(outBuff, 0, outLen); } /** * Encodes a byte array into Base64 notation. * * @param source the data to convert * @param off offset in array where conversion should begin * @param len length of data to convert * @param alphabet is the encoding alphabet * @param maxLineLength maximum length of one line. * @return the BASE64-encoded byte array */ public static byte[] encode(byte[] source, int off, int len, byte[] alphabet, int maxLineLength) { int lenDiv3 = (len + 2) / 3; // ceil(len / 3) int len43 = lenDiv3 * 4; byte[] outBuff = new byte[len43 // Main 4:3 + (len43 / maxLineLength)]; // New lines int d = 0; int e = 0; int len2 = len - 2; int lineLength = 0; for (; d < len2; d += 3, e += 4) { // The following block of code is the same as // encode3to4( source, d + off, 3, outBuff, e, alphabet ); // but inlined for faster encoding (~20% improvement) int inBuff = ((source[d + off] << 24) >>> 8) | ((source[d + 1 + off] << 24) >>> 16) | ((source[d + 2 + off] << 24) >>> 24); outBuff[e] = alphabet[(inBuff >>> 18)]; outBuff[e + 1] = alphabet[(inBuff >>> 12) & 0x3f]; outBuff[e + 2] = alphabet[(inBuff >>> 6) & 0x3f]; outBuff[e + 3] = alphabet[(inBuff) & 0x3f]; lineLength += 4; if (lineLength == maxLineLength) { outBuff[e + 4] = NEW_LINE; e++; lineLength = 0; } // end if: end of line } // end for: each piece of array if (d < len) { encode3to4(source, d + off, len - d, outBuff, e, alphabet); lineLength += 4; if (lineLength == maxLineLength) { // Add a last newline outBuff[e + 4] = NEW_LINE; e++; } e += 4; } assert (e == outBuff.length); return outBuff; } /* ******** D E C O D I N G M E T H O D S ******** */ /** * Decodes four bytes from array <var>source</var> * and writes the resulting bytes (up to three of them) * to <var>destination</var>. * The source and destination arrays can be manipulated * anywhere along their length by specifying * <var>srcOffset</var> and <var>destOffset</var>. * This method does not check to make sure your arrays * are large enough to accommodate <var>srcOffset</var> + 4 for * the <var>source</var> array or <var>destOffset</var> + 3 for * the <var>destination</var> array. * This method returns the actual number of bytes that * were converted from the Base64 encoding. * * * @param source the array to convert * @param srcOffset the index where conversion begins * @param destination the array to hold the conversion * @param destOffset the index where output will be put * @param decodabet the decodabet for decoding Base64 content * @return the number of decoded bytes converted * @since 1.3 */ private static int decode4to3(byte[] source, int srcOffset, byte[] destination, int destOffset, byte[] decodabet) { // Example: Dk== if (source[srcOffset + 2] == EQUALS_SIGN) { int outBuff = ((decodabet[source[srcOffset]] << 24) >>> 6) | ((decodabet[source[srcOffset + 1]] << 24) >>> 12); destination[destOffset] = (byte) (outBuff >>> 16); return 1; } else if (source[srcOffset + 3] == EQUALS_SIGN) { // Example: DkL= int outBuff = ((decodabet[source[srcOffset]] << 24) >>> 6) | ((decodabet[source[srcOffset + 1]] << 24) >>> 12) | ((decodabet[source[srcOffset + 2]] << 24) >>> 18); destination[destOffset] = (byte) (outBuff >>> 16); destination[destOffset + 1] = (byte) (outBuff >>> 8); return 2; } else { // Example: DkLE int outBuff = ((decodabet[source[srcOffset]] << 24) >>> 6) | ((decodabet[source[srcOffset + 1]] << 24) >>> 12) | ((decodabet[source[srcOffset + 2]] << 24) >>> 18) | ((decodabet[source[srcOffset + 3]] << 24) >>> 24); destination[destOffset] = (byte) (outBuff >> 16); destination[destOffset + 1] = (byte) (outBuff >> 8); destination[destOffset + 2] = (byte) (outBuff); return 3; } } // end decodeToBytes /** * Decodes data from Base64 notation. * * @param s the string to decode (decoded in default encoding) * @return the decoded data * @since 1.4 */ public static byte[] decode(String s) throws Base64DecoderException { byte[] bytes = s.getBytes(); return decode(bytes, 0, bytes.length); } /** * Decodes data from web safe Base64 notation. * Web safe encoding uses '-' instead of '+', '_' instead of '/' * * @param s the string to decode (decoded in default encoding) * @return the decoded data */ public static byte[] decodeWebSafe(String s) throws Base64DecoderException { byte[] bytes = s.getBytes(); return decodeWebSafe(bytes, 0, bytes.length); } /** * Decodes Base64 content in byte array format and returns * the decoded byte array. * * @param source The Base64 encoded data * @return decoded data * @since 1.3 * @throws Base64DecoderException */ public static byte[] decode(byte[] source) throws Base64DecoderException { return decode(source, 0, source.length); } /** * Decodes web safe Base64 content in byte array format and returns * the decoded data. * Web safe encoding uses '-' instead of '+', '_' instead of '/' * * @param source the string to decode (decoded in default encoding) * @return the decoded data */ public static byte[] decodeWebSafe(byte[] source) throws Base64DecoderException { return decodeWebSafe(source, 0, source.length); } /** * Decodes Base64 content in byte array format and returns * the decoded byte array. * * @param source the Base64 encoded data * @param off the offset of where to begin decoding * @param len the length of characters to decode * @return decoded data * @since 1.3 * @throws Base64DecoderException */ public static byte[] decode(byte[] source, int off, int len) throws Base64DecoderException { return decode(source, off, len, DECODABET); } /** * Decodes web safe Base64 content in byte array format and returns * the decoded byte array. * Web safe encoding uses '-' instead of '+', '_' instead of '/' * * @param source the Base64 encoded data * @param off the offset of where to begin decoding * @param len the length of characters to decode * @return decoded data */ public static byte[] decodeWebSafe(byte[] source, int off, int len) throws Base64DecoderException { return decode(source, off, len, WEBSAFE_DECODABET); } /** * Decodes Base64 content using the supplied decodabet and returns * the decoded byte array. * * @param source the Base64 encoded data * @param off the offset of where to begin decoding * @param len the length of characters to decode * @param decodabet the decodabet for decoding Base64 content * @return decoded data */ public static byte[] decode(byte[] source, int off, int len, byte[] decodabet) throws Base64DecoderException { int len34 = len * 3 / 4; byte[] outBuff = new byte[2 + len34]; // Upper limit on size of output int outBuffPosn = 0; byte[] b4 = new byte[4]; int b4Posn = 0; int i = 0; byte sbiCrop = 0; byte sbiDecode = 0; for (i = 0; i < len; i++) { sbiCrop = (byte) (source[i + off] & 0x7f); // Only the low seven bits sbiDecode = decodabet[sbiCrop]; if (sbiDecode >= WHITE_SPACE_ENC) { // White space Equals sign or better if (sbiDecode >= EQUALS_SIGN_ENC) { // An equals sign (for padding) must not occur at position 0 or 1 // and must be the last byte[s] in the encoded value if (sbiCrop == EQUALS_SIGN) { int bytesLeft = len - i; byte lastByte = (byte) (source[len - 1 + off] & 0x7f); if (b4Posn == 0 || b4Posn == 1) { throw new Base64DecoderException( "invalid padding byte '=' at byte offset " + i); } else if ((b4Posn == 3 && bytesLeft > 2) || (b4Posn == 4 && bytesLeft > 1)) { throw new Base64DecoderException( "padding byte '=' falsely signals end of encoded value " + "at offset " + i); } else if (lastByte != EQUALS_SIGN && lastByte != NEW_LINE) { throw new Base64DecoderException( "encoded value has invalid trailing byte"); } break; } b4[b4Posn++] = sbiCrop; if (b4Posn == 4) { outBuffPosn += decode4to3(b4, 0, outBuff, outBuffPosn, decodabet); b4Posn = 0; } } } else { throw new Base64DecoderException("Bad Base64 input character at " + i + ": " + source[i + off] + "(decimal)"); } } // Because web safe encoding allows non padding base64 encodes, we // need to pad the rest of the b4 buffer with equal signs when // b4Posn != 0. There can be at most 2 equal signs at the end of // four characters, so the b4 buffer must have two or three // characters. This also catches the case where the input is // padded with EQUALS_SIGN if (b4Posn != 0) { if (b4Posn == 1) { throw new Base64DecoderException("single trailing character at offset " + (len - 1)); } b4[b4Posn++] = EQUALS_SIGN; outBuffPosn += decode4to3(b4, 0, outBuff, outBuffPosn, decodabet); } byte[] out = new byte[outBuffPosn]; System.arraycopy(outBuff, 0, out, 0, outBuffPosn); return out; } }