+ * This class implements section 6.8. Base64 Content-Transfer-Encoding from RFC 2045 Multipurpose + * Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies by Freed and Borenstein. + *
+ *+ * The class can be parameterized in the following manner with various constructors: + *
+ * Since this class operates directly on byte streams, and not character streams, it is hard-coded to only encode/decode + * character encodings which are compatible with the lower 127 ASCII chart (ISO-8859-1, Windows-1252, UTF-8, etc). + *
+ * + * @see RFC 2045 + * @since 2.2 + */ +public class Base64 { + private static final int DEFAULT_BUFFER_RESIZE_FACTOR = 2; + + private static final int DEFAULT_BUFFER_SIZE = 8192; + /** + * An empty immutable {@code byte} array. + */ + private static final byte[] EMPTY_BTYE_ARRAY = new byte[0]; + /** + * Chunk size per RFC 2045 section 6.8. + * + *+ * The {@value} character limit does not count the trailing CRLF, but counts all other characters, including any + * equal signs. + *
+ * + * @see RFC 2045 section 6.8 + */ + static final int CHUNK_SIZE = 76; + + /** + * Chunk separator per RFC 2045 section 2.1. + * + * @see RFC 2045 section 2.1 + */ + private static final byte[] CHUNK_SEPARATOR = {'\r', '\n'}; + + /** + * This array is a lookup table that translates 6-bit positive integer index values into their "Base64 Alphabet" + * equivalents as specified in Table 1 of RFC 2045. + * + * Thanks to "commons" project in ws.apache.org for this code. + * http://svn.apache.org/repos/asf/webservices/commons/trunk/modules/util/ + */ + private static final byte[] STANDARD_ENCODE_TABLE = { + 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', + 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', + 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', + 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', + '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/' + }; + + /** + * This is a copy of the STANDARD_ENCODE_TABLE above, but with + and / + * changed to - and _ to make the encoded Base64 results more URL-SAFE. + * This table is only used when the Base64's mode is set to URL-SAFE. + */ + private static final byte[] URL_SAFE_ENCODE_TABLE = { + 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', + 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', + 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', + 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', + '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '-', '_' + }; + + /** + * Byte used to pad output. + */ + private static final byte PAD = '='; + + /** + * This array is a lookup table that translates Unicode characters drawn from the "Base64 Alphabet" (as specified in + * Table 1 of RFC 2045) into their 6-bit positive integer equivalents. Characters that are not in the Base64 + * alphabet but fall within the bounds of the array are translated to -1. + * + * Note: '+' and '-' both decode to 62. '/' and '_' both decode to 63. This means decoder seamlessly handles both + * URL_SAFE and STANDARD base64. (The encoder, on the other hand, needs to know ahead of time what to emit). + * + * Thanks to "commons" project in ws.apache.org for this code. + * http://svn.apache.org/repos/asf/webservices/commons/trunk/modules/util/ + */ + private static final byte[] DECODE_TABLE = { + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, 62, -1, 63, 52, 53, 54, + 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, -1, 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, -1, -1, -1, -1, 63, -1, 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 + }; + + /** Mask used to extract 6 bits, used when encoding */ + private static final int MASK_6BITS = 0x3f; + + /** Mask used to extract 8 bits, used in decoding base64 bytes */ + private static final int MASK_8BITS = 0xff; + + // The static final fields above are used for the original static byte[] methods on Base64. + // The private member fields below are used with the new streaming approach, which requires + // some state be preserved between calls of encode() and decode(). + + /** + * Encode table to use: either STANDARD or URL_SAFE. Note: the DECODE_TABLE above remains static because it is able + * to decode both STANDARD and URL_SAFE streams, but the encodeTable must be a member variable so we can switch + * between the two modes. + */ + private final byte[] encodeTable; + + /** + * Line length for encoding. Not used when decoding. A value of zero or less implies no chunking of the base64 + * encoded data. + */ + private final int lineLength; + + /** + * Line separator for encoding. Not used when decoding. Only used if lineLength > 0. + */ + private final byte[] lineSeparator; + + /** + * Convenience variable to help us determine when our buffer is going to run out of room and needs resizing. + *decodeSize = 3 + lineSeparator.length;
+ */
+ private final int decodeSize;
+
+ /**
+ * Convenience variable to help us determine when our buffer is going to run out of room and needs resizing.
+ * encodeSize = 4 + lineSeparator.length;
+ */
+ private final int encodeSize;
+
+ /**
+ * Buffer for streaming.
+ */
+ private byte[] buffer;
+
+ /**
+ * Position where next character should be written in the buffer.
+ */
+ private int pos;
+
+ /**
+ * Position where next character should be read from the buffer.
+ */
+ private int readPos;
+
+ /**
+ * Variable tracks how many characters have been written to the current line. Only used when encoding. We use it to
+ * make sure each encoded line never goes beyond lineLength (if lineLength > 0).
+ */
+ private int currentLinePos;
+
+ /**
+ * Writes to the buffer only occur after every 3 reads when encoding, an every 4 reads when decoding. This variable
+ * helps track that.
+ */
+ private int modulus;
+
+ /**
+ * Boolean flag to indicate the EOF has been reached. Once EOF has been reached, this Base64 object becomes useless,
+ * and must be thrown away.
+ */
+ private boolean eof;
+
+ /**
+ * Place holder for the 3 bytes we're dealing with for our base64 logic. Bitwise operations store and extract the
+ * base64 encoding or decoding from this variable.
+ */
+ private int x;
+
+ /**
+ * Creates a Base64 codec used for decoding (all modes) and encoding in URL-unsafe mode.
+ * + * When encoding the line length is 76, the line separator is CRLF, and the encoding table is STANDARD_ENCODE_TABLE. + *
+ * + *+ * When decoding all variants are supported. + *
+ */ + public Base64() { + this(false); + } + + /** + * Creates a Base64 codec used for decoding (all modes) and encoding in the given URL-safe mode. + *+ * When encoding the line length is 76, the line separator is CRLF, and the encoding table is STANDARD_ENCODE_TABLE. + *
+ * + *+ * When decoding all variants are supported. + *
+ * + * @param urlSafe + * iftrue, URL-safe encoding is used. In most cases this should be set to
+ * false.
+ * @since 1.4
+ */
+ public Base64(final boolean urlSafe) {
+ this(CHUNK_SIZE, CHUNK_SEPARATOR, urlSafe);
+ }
+
+ /**
+ * Creates a Base64 codec used for decoding (all modes) and encoding in URL-unsafe mode.
+ * + * When encoding the line length is given in the constructor, the line separator is CRLF, and the encoding table is + * STANDARD_ENCODE_TABLE. + *
+ *+ * Line lengths that aren't multiples of 4 will still essentially end up being multiples of 4 in the encoded data. + *
+ *+ * When decoding all variants are supported. + *
+ * + * @param lineLength + * Each line of encoded data will be at most of the given length (rounded down to nearest multiple of 4). + * If {@code lineLength <= 0}, then the output will not be divided into lines (chunks). Ignored when decoding. + * @since 1.4 + */ + public Base64(final int lineLength) { + this(lineLength, CHUNK_SEPARATOR); + } + + /** + * Creates a Base64 codec used for decoding (all modes) and encoding in URL-unsafe mode. + *+ * When encoding the line length and line separator are given in the constructor, and the encoding table is + * STANDARD_ENCODE_TABLE. + *
+ *+ * Line lengths that aren't multiples of 4 will still essentially end up being multiples of 4 in the encoded data. + *
+ *+ * When decoding all variants are supported. + *
+ * + * @param lineLength + * Each line of encoded data will be at most of the given length (rounded down to nearest multiple of 4). + * If {@code lineLength <= 0}, then the output will not be divided into lines (chunks). Ignored when decoding. + * @param lineSeparator + * Each line of encoded data will end with this sequence of bytes. + * @throws IllegalArgumentException + * Thrown when the provided lineSeparator included some base64 characters. + * @since 1.4 + */ + public Base64(final int lineLength, final byte[] lineSeparator) { + this(lineLength, lineSeparator, false); + } + + /** + * Creates a Base64 codec used for decoding (all modes) and encoding in URL-unsafe mode. + *+ * When encoding the line length and line separator are given in the constructor, and the encoding table is + * STANDARD_ENCODE_TABLE. + *
+ *+ * Line lengths that aren't multiples of 4 will still essentially end up being multiples of 4 in the encoded data. + *
+ *+ * When decoding all variants are supported. + *
+ * + * @param lineLength + * Each line of encoded data will be at most of the given length (rounded down to nearest multiple of 4). + * If {@code lineLength <= 0}, then the output will not be divided into lines (chunks). Ignored when decoding. + * @param lineSeparator + * Each line of encoded data will end with this sequence of bytes. + * @param urlSafe + * Instead of emitting '+' and '/' we emit '-' and '_' respectively. urlSafe is only applied to encode + * operations. Decoding seamlessly handles both modes. + * @throws IllegalArgumentException + * The provided lineSeparator included some base64 characters. That's not going to work! + * @since 1.4 + */ + public Base64(int lineLength, byte[] lineSeparator, final boolean urlSafe) { + if (lineSeparator == null) { + lineLength = 0; // disable chunk-separating + lineSeparator = EMPTY_BTYE_ARRAY; // this just gets ignored + } + this.lineLength = lineLength > 0 ? (lineLength / 4) * 4 : 0; + this.lineSeparator = new byte[lineSeparator.length]; + System.arraycopy(lineSeparator, 0, this.lineSeparator, 0, lineSeparator.length); + if (lineLength > 0) { + this.encodeSize = 4 + lineSeparator.length; + } else { + this.encodeSize = 4; + } + this.decodeSize = this.encodeSize - 1; + if (containsBase64Byte(lineSeparator)) { + final String sep = newStringUtf8(lineSeparator); + throw new IllegalArgumentException("lineSeperator must not contain base64 characters: [" + sep + "]"); + } + this.encodeTable = urlSafe ? URL_SAFE_ENCODE_TABLE : STANDARD_ENCODE_TABLE; + } + + /** + * Returns our current encode mode. True if we're URL-SAFE, false otherwise. + * + * @return true if we're in URL-SAFE mode, false otherwise. + * @since 1.4 + */ + public boolean isUrlSafe() { + return this.encodeTable == URL_SAFE_ENCODE_TABLE; + } + + /** + * Returns true if this Base64 object has buffered data for reading. + * + * @return true if there is Base64 object still available for reading. + */ + boolean hasData() { + return this.buffer != null; + } + + /** + * Returns the amount of buffered data available for reading. + * + * @return The amount of buffered data available for reading. + */ + int avail() { + return buffer != null ? pos - readPos : 0; + } + + /** Doubles our buffer. */ + private void resizeBuffer() { + if (buffer == null) { + buffer = new byte[DEFAULT_BUFFER_SIZE]; + pos = 0; + readPos = 0; + } else { + final byte[] b = new byte[buffer.length * DEFAULT_BUFFER_RESIZE_FACTOR]; + System.arraycopy(buffer, 0, b, 0, buffer.length); + buffer = b; + } + } + + /** + * Extracts buffered data into the provided byte[] array, starting at position bPos, up to a maximum of bAvail + * bytes. Returns how many bytes were actually extracted. + * + * @param b + * byte[] array to extract the buffered data into. + * @param bPos + * position in byte[] array to start extraction at. + * @param bAvail + * amount of bytes we're allowed to extract. We may extract fewer (if fewer are available). + * @return The number of bytes successfully extracted into the provided byte[] array. + */ + int readResults(final byte[] b, final int bPos, final int bAvail) { + if (buffer != null) { + final int len = Math.min(avail(), bAvail); + if (buffer != b) { + System.arraycopy(buffer, readPos, b, bPos, len); + readPos += len; + if (readPos >= pos) { + buffer = null; + } + } else { + // Re-using the original consumer's output array is only + // allowed for one round. + buffer = null; + } + return len; + } + return eof ? -1 : 0; + } + + /** + * Sets the streaming buffer. This is a small optimization where we try to buffer directly to the consumer's output + * array for one round (if the consumer calls this method first) instead of starting our own buffer. + * + * @param out + * byte[] array to buffer directly to. + * @param outPos + * Position to start buffering into. + * @param outAvail + * Amount of bytes available for direct buffering. + */ + void setInitialBuffer(final byte[] out, final int outPos, final int outAvail) { + // We can re-use consumer's original output array under + // special circumstances, saving on some System.arraycopy(). + if (out != null && out.length == outAvail) { + buffer = out; + pos = outPos; + readPos = outPos; + } + } + + /** + *+ * Encodes all of the provided data, starting at inPos, for inAvail bytes. Must be called at least twice: once with + * the data to encode, and once with inAvail set to "-1" to alert encoder that EOF has been reached, so flush last + * remaining bytes (if not multiple of 3). + *
+ *+ * Thanks to "commons" project in ws.apache.org for the bitwise operations, and general approach. + * http://svn.apache.org/repos/asf/webservices/commons/trunk/modules/util/ + *
+ * + * @param in + * byte[] array of binary data to base64 encode. + * @param inPos + * Position to start reading data from. + * @param inAvail + * Amount of bytes available from input for encoding. + */ + void encode(final byte[] in, int inPos, final int inAvail) { + if (eof) { + return; + } + // inAvail < 0 is how we're informed of EOF in the underlying data we're + // encoding. + if (inAvail < 0) { + eof = true; + if (buffer == null || buffer.length - pos < encodeSize) { + resizeBuffer(); + } + switch (modulus) { + case 1 : + buffer[pos++] = encodeTable[(x >> 2) & MASK_6BITS]; + buffer[pos++] = encodeTable[(x << 4) & MASK_6BITS]; + // URL-SAFE skips the padding to further reduce size. + if (encodeTable == STANDARD_ENCODE_TABLE) { + buffer[pos++] = PAD; + buffer[pos++] = PAD; + } + break; + + case 2 : + buffer[pos++] = encodeTable[(x >> 10) & MASK_6BITS]; + buffer[pos++] = encodeTable[(x >> 4) & MASK_6BITS]; + buffer[pos++] = encodeTable[(x << 2) & MASK_6BITS]; + // URL-SAFE skips the padding to further reduce size. + if (encodeTable == STANDARD_ENCODE_TABLE) { + buffer[pos++] = PAD; + } + break; + default: + break; // other values ignored + } + if (lineLength > 0 && pos > 0) { + System.arraycopy(lineSeparator, 0, buffer, pos, lineSeparator.length); + pos += lineSeparator.length; + } + } else { + for (int i = 0; i < inAvail; i++) { + if (buffer == null || buffer.length - pos < encodeSize) { + resizeBuffer(); + } + modulus = (++modulus) % 3; + int b = in[inPos++]; + if (b < 0) { + b += 256; + } + x = (x << 8) + b; + if (0 == modulus) { + buffer[pos++] = encodeTable[(x >> 18) & MASK_6BITS]; + buffer[pos++] = encodeTable[(x >> 12) & MASK_6BITS]; + buffer[pos++] = encodeTable[(x >> 6) & MASK_6BITS]; + buffer[pos++] = encodeTable[x & MASK_6BITS]; + currentLinePos += 4; + if (lineLength > 0 && lineLength <= currentLinePos) { + System.arraycopy(lineSeparator, 0, buffer, pos, lineSeparator.length); + pos += lineSeparator.length; + currentLinePos = 0; + } + } + } + } + } + + /** + *+ * Decodes all of the provided data, starting at inPos, for inAvail bytes. Should be called at least twice: once + * with the data to decode, and once with inAvail set to "-1" to alert decoder that EOF has been reached. The "-1" + * call is not necessary when decoding, but it doesn't hurt, either. + *
+ *+ * Ignores all non-base64 characters. This is how chunked (e.g. 76 character) data is handled, since CR and LF are + * silently ignored, but has implications for other bytes, too. This method subscribes to the garbage-in, + * garbage-out philosophy: it will not check the provided data for validity. + *
+ *+ * Thanks to "commons" project in ws.apache.org for the bitwise operations, and general approach. + * http://svn.apache.org/repos/asf/webservices/commons/trunk/modules/util/ + *
+ * + * @param in + * byte[] array of ascii data to base64 decode. + * @param inPos + * Position to start reading data from. + * @param inAvail + * Amount of bytes available from input for encoding. + */ + void decode(final byte[] in, int inPos, final int inAvail) { + if (eof) { + return; + } + if (inAvail < 0) { + eof = true; + } + for (int i = 0; i < inAvail; i++) { + if (buffer == null || buffer.length - pos < decodeSize) { + resizeBuffer(); + } + final byte b = in[inPos++]; + if (b == PAD) { + // We're done. + eof = true; + break; + } + if (b >= 0 && b < DECODE_TABLE.length) { + final int result = DECODE_TABLE[b]; + if (result >= 0) { + modulus = (++modulus) % 4; + x = (x << 6) + result; + if (modulus == 0) { + buffer[pos++] = (byte) ((x >> 16) & MASK_8BITS); + buffer[pos++] = (byte) ((x >> 8) & MASK_8BITS); + buffer[pos++] = (byte) (x & MASK_8BITS); + } + } + } + } + + // Two forms of EOF as far as base64 decoder is concerned: actual + // EOF (-1) and first time '=' character is encountered in stream. + // This approach makes the '=' padding characters completely optional. + if (eof && modulus != 0) { + x = x << 6; + switch (modulus) { + case 2 : + x = x << 6; + buffer[pos++] = (byte) ((x >> 16) & MASK_8BITS); + break; + case 3 : + buffer[pos++] = (byte) ((x >> 16) & MASK_8BITS); + buffer[pos++] = (byte) ((x >> 8) & MASK_8BITS); + break; + default: + break; // other values ignored + } + } + } + + /** + * Returns whether or not theoctet is in the base 64 alphabet.
+ *
+ * @param octet
+ * The value to test
+ * @return true if the value is defined in the the base 64 alphabet, false otherwise.
+ * @since 1.4
+ */
+ public static boolean isBase64(final byte octet) {
+ return octet == PAD || (octet >= 0 && octet < DECODE_TABLE.length && DECODE_TABLE[octet] != -1);
+ }
+
+ /**
+ * Tests a given byte array to see if it contains only valid characters within the Base64 alphabet. Currently the
+ * method treats whitespace as valid.
+ *
+ * @param arrayOctet
+ * byte array to test
+ * @return true if all bytes are valid characters in the Base64 alphabet or if the byte array is empty;
+ * false, otherwise
+ */
+ public static boolean isArrayByteBase64(final byte[] arrayOctet) {
+ for (final byte element : arrayOctet) {
+ if (!isBase64(element) && !isWhiteSpace(element)) {
+ return false;
+ }
+ }
+ return true;
+ }
+
+ /**
+ * Tests a given byte array to see if it contains only valid characters within the Base64 alphabet.
+ *
+ * @param arrayOctet
+ * byte array to test
+ * @return true if any byte is a valid character in the Base64 alphabet; false herwise
+ */
+ private static boolean containsBase64Byte(final byte[] arrayOctet) {
+ for (final byte element : arrayOctet)
+ {
+ if (isBase64(element)) {
+ return true;
+ }
+ }
+ return false;
+ }
+
+ /**
+ * Encodes binary data using the base64 algorithm but does not chunk the output.
+ *
+ * @param binaryData
+ * binary data to encode
+ * @return byte[] containing Base64 characters in their UTF-8 representation.
+ */
+ public static byte[] encodeBase64(final byte[] binaryData) {
+ return encodeBase64(binaryData, false);
+ }
+
+ /**
+ * Encodes binary data using the base64 algorithm into 76 character blocks separated by CRLF.
+ * + * For a non-chunking version, see {@link #encodeBase64StringUnChunked(byte[])}. + * + * @param binaryData + * binary data to encode + * @return String containing Base64 characters. + * @since 1.4 + */ + public static String encodeBase64String(final byte[] binaryData) { + return newStringUtf8(encodeBase64(binaryData, true)); + } + + /** + * Encodes binary data using the base64 algorithm, without using chunking. + *
+ * For a chunking version, see {@link #encodeBase64String(byte[])}.
+ *
+ * @param binaryData
+ * binary data to encode
+ * @return String containing Base64 characters.
+ * @since 3.2
+ */
+ public static String encodeBase64StringUnChunked(final byte[] binaryData) {
+ return newStringUtf8(encodeBase64(binaryData, false));
+ }
+
+ /**
+ * Encodes binary data using the base64 algorithm.
+ *
+ * @param binaryData
+ * binary data to encode
+ * @param useChunking whether to split the output into chunks
+ * @return String containing Base64 characters.
+ * @since 3.2
+ */
+ public static String encodeBase64String(final byte[] binaryData, final boolean useChunking) {
+ return newStringUtf8(encodeBase64(binaryData, useChunking));
+ }
+
+ /**
+ * Encodes binary data using a URL-safe variation of the base64 algorithm but does not chunk the output. The
+ * url-safe variation emits - and _ instead of + and / characters.
+ *
+ * @param binaryData
+ * binary data to encode
+ * @return byte[] containing Base64 characters in their UTF-8 representation.
+ * @since 1.4
+ */
+ public static byte[] encodeBase64URLSafe(final byte[] binaryData) {
+ return encodeBase64(binaryData, false, true);
+ }
+
+ /**
+ * Encodes binary data using a URL-safe variation of the base64 algorithm but does not chunk the output. The
+ * url-safe variation emits - and _ instead of + and / characters.
+ *
+ * @param binaryData
+ * binary data to encode
+ * @return String containing Base64 characters
+ * @since 1.4
+ */
+ public static String encodeBase64URLSafeString(final byte[] binaryData) {
+ return newStringUtf8(encodeBase64(binaryData, false, true));
+ }
+
+ /**
+ * Encodes binary data using the base64 algorithm and chunks the encoded output into 76 character blocks
+ *
+ * @param binaryData
+ * binary data to encode
+ * @return Base64 characters chunked in 76 character blocks
+ */
+ public static byte[] encodeBase64Chunked(final byte[] binaryData) {
+ return encodeBase64(binaryData, true);
+ }
+
+ /**
+ * Decodes a String containing containing characters in the Base64 alphabet.
+ *
+ * @param pArray
+ * A String containing Base64 character data
+ * @return a byte array containing binary data
+ * @since 1.4
+ */
+ public byte[] decode(final String pArray) {
+ return decode(getBytesUtf8(pArray));
+ }
+
+ private byte[] getBytesUtf8(final String pArray) {
+ return pArray.getBytes(StandardCharsets.UTF_8);
+ }
+
+ /**
+ * Decodes a byte[] containing containing characters in the Base64 alphabet.
+ *
+ * @param pArray
+ * A byte array containing Base64 character data
+ * @return a byte array containing binary data
+ */
+ public byte[] decode(final byte[] pArray) {
+ reset();
+ if (pArray == null || pArray.length == 0) {
+ return pArray;
+ }
+ final long len = (pArray.length * 3) / 4;
+ final byte[] buf = new byte[(int) len];
+ setInitialBuffer(buf, 0, buf.length);
+ decode(pArray, 0, pArray.length);
+ decode(pArray, 0, -1); // Notify decoder of EOF.
+
+ // Would be nice to just return buf (like we sometimes do in the encode
+ // logic), but we have no idea what the line-length was (could even be
+ // variable). So we cannot determine ahead of time exactly how big an
+ // array is necessary. Hence the need to construct a 2nd byte array to
+ // hold the final result:
+
+ final byte[] result = new byte[pos];
+ readResults(result, 0, result.length);
+ return result;
+ }
+
+ /**
+ * Encodes binary data using the base64 algorithm, optionally chunking the output into 76 character blocks.
+ *
+ * @param binaryData
+ * Array containing binary data to encode.
+ * @param isChunked
+ * if true this encoder will chunk the base64 output into 76 character blocks
+ * @return Base64-encoded data.
+ * @throws IllegalArgumentException
+ * Thrown when the input array needs an output array bigger than {@link Integer#MAX_VALUE}
+ */
+ public static byte[] encodeBase64(final byte[] binaryData, final boolean isChunked) {
+ return encodeBase64(binaryData, isChunked, false);
+ }
+
+ /**
+ * Encodes binary data using the base64 algorithm, optionally chunking the output into 76 character blocks.
+ *
+ * @param binaryData
+ * Array containing binary data to encode.
+ * @param isChunked
+ * if true this encoder will chunk the base64 output into 76 character blocks
+ * @param urlSafe
+ * if true this encoder will emit - and _ instead of the usual + and / characters.
+ * @return Base64-encoded data.
+ * @throws IllegalArgumentException
+ * Thrown when the input array needs an output array bigger than {@link Integer#MAX_VALUE}
+ * @since 1.4
+ */
+ public static byte[] encodeBase64(final byte[] binaryData, final boolean isChunked, final boolean urlSafe) {
+ return encodeBase64(binaryData, isChunked, urlSafe, Integer.MAX_VALUE);
+ }
+
+ /**
+ * Encodes binary data using the base64 algorithm, optionally chunking the output into 76 character blocks.
+ *
+ * @param binaryData
+ * Array containing binary data to encode.
+ * @param isChunked
+ * if true this encoder will chunk the base64 output into 76 character blocks
+ * @param urlSafe
+ * if true this encoder will emit - and _ instead of the usual + and / characters.
+ * @param maxResultSize
+ * The maximum result size to accept.
+ * @return Base64-encoded data.
+ * @throws IllegalArgumentException
+ * Thrown when the input array needs an output array bigger than maxResultSize
+ * @since 1.4
+ */
+ public static byte[] encodeBase64(final byte[] binaryData, final boolean isChunked, final boolean urlSafe,
+ final int maxResultSize) {
+ if (binaryData == null || binaryData.length == 0) {
+ return binaryData;
+ }
+
+ final long len = getEncodeLength(binaryData, isChunked ? CHUNK_SIZE : 0,
+ isChunked ? CHUNK_SEPARATOR : EMPTY_BTYE_ARRAY);
+ if (len > maxResultSize) {
+ throw new IllegalArgumentException("Input array too big, the output array would be bigger (" + len
+ + ") than the specified maxium size of " + maxResultSize);
+ }
+
+ final Base64 b64 = isChunked ? new Base64(urlSafe) : new Base64(0, CHUNK_SEPARATOR, urlSafe);
+ return b64.encode(binaryData);
+ }
+
+ /**
+ * Decodes a Base64 String into octets.
+ *
+ * @param base64String
+ * String containing Base64 data
+ * @return Array containing decoded data.
+ * @since 1.4
+ */
+ public static byte[] decodeBase64(final String base64String) {
+ return new Base64().decode(base64String);
+ }
+
+ /**
+ * Decodes Base64 data into octets.
+ *
+ * @param base64Data
+ * Byte array containing Base64 data
+ * @return Array containing decoded data.
+ */
+ public static byte[] decodeBase64(final byte[] base64Data) {
+ return new Base64().decode(base64Data);
+ }
+
+ /**
+ * Checks if a byte value is whitespace or not.
+ *
+ * @param byteToCheck
+ * the byte to check
+ * @return true if byte is whitespace, false otherwise
+ */
+ private static boolean isWhiteSpace(final byte byteToCheck) {
+ switch (byteToCheck) {
+ case ' ' :
+ case '\n' :
+ case '\r' :
+ case '\t' :
+ return true;
+ default :
+ return false;
+ }
+ }
+
+ /**
+ * Encodes a byte[] containing binary data, into a String containing characters in the Base64 alphabet.
+ *
+ * @param pArray
+ * a byte array containing binary data
+ * @return A String containing only Base64 character data
+ * @since 1.4
+ */
+ public String encodeToString(final byte[] pArray) {
+ return newStringUtf8(encode(pArray));
+ }
+
+ private static String newStringUtf8(final byte[] encode) {
+ return new String(encode, StandardCharsets.UTF_8);
+ }
+
+ /**
+ * Encodes a byte[] containing binary data, into a byte[] containing characters in the Base64 alphabet.
+ *
+ * @param pArray
+ * a byte array containing binary data
+ * @return A byte array containing only Base64 character data
+ */
+ public byte[] encode(final byte[] pArray) {
+ reset();
+ if (pArray == null || pArray.length == 0) {
+ return pArray;
+ }
+ final long len = getEncodeLength(pArray, lineLength, lineSeparator);
+ byte[] buf = new byte[(int) len];
+ setInitialBuffer(buf, 0, buf.length);
+ encode(pArray, 0, pArray.length);
+ encode(pArray, 0, -1); // Notify encoder of EOF.
+ // Encoder might have resized, even though it was unnecessary.
+ if (buffer != buf) {
+ readResults(buf, 0, buf.length);
+ }
+ // In URL-SAFE mode we skip the padding characters, so sometimes our
+ // final length is a bit smaller.
+ if (isUrlSafe() && pos < buf.length) {
+ final byte[] smallerBuf = new byte[pos];
+ System.arraycopy(buf, 0, smallerBuf, 0, pos);
+ buf = smallerBuf;
+ }
+ return buf;
+ }
+
+ /**
+ * Pre-calculates the amount of space needed to base64-encode the supplied array.
+ *
+ * @param pArray byte[] array which will later be encoded
+ * @param chunkSize line-length of the output (<= 0 means no chunking) between each
+ * chunkSeparator (e.g. CRLF).
+ * @param chunkSeparator the sequence of bytes used to separate chunks of output (e.g. CRLF).
+ *
+ * @return amount of space needed to encoded the supplied array. Returns
+ * a long since a max-len array will require Integer.MAX_VALUE + 33%.
+ */
+ private static long getEncodeLength(final byte[] pArray, int chunkSize, final byte[] chunkSeparator) {
+ // base64 always encodes to multiples of 4.
+ chunkSize = (chunkSize / 4) * 4;
+
+ long len = (pArray.length * 4) / 3;
+ final long mod = len % 4;
+ if (mod != 0) {
+ len += 4 - mod;
+ }
+ if (chunkSize > 0) {
+ final boolean lenChunksPerfectly = len % chunkSize == 0;
+ len += (len / chunkSize) * chunkSeparator.length;
+ if (!lenChunksPerfectly) {
+ len += chunkSeparator.length;
+ }
+ }
+ return len;
+ }
+
+ // Implementation of integer encoding used for crypto
+ /**
+ * Decodes a byte64-encoded integer according to crypto standards such as W3C's XML-Signature
+ *
+ * @param pArray
+ * a byte array containing base64 character data
+ * @return A BigInteger
+ * @since 1.4
+ */
+ public static BigInteger decodeInteger(final byte[] pArray) {
+ return new BigInteger(1, decodeBase64(pArray));
+ }
+
+ /**
+ * Encodes to a byte64-encoded integer according to crypto standards such as W3C's XML-Signature
+ *
+ * @param bigInt
+ * a BigInteger
+ * @return A byte array containing base64 character data
+ * @throws NullPointerException
+ * if null is passed in
+ * @since 1.4
+ */
+ public static byte[] encodeInteger(final BigInteger bigInt) {
+ if (bigInt == null) {
+ throw new NullPointerException("encodeInteger called with null parameter");
+ }
+ return encodeBase64(toIntegerBytes(bigInt), false);
+ }
+
+ /**
+ * Returns a byte-array representation of a BigInteger without sign bit.
+ *
+ * @param bigInt
+ * BigInteger to be converted
+ * @return a byte array representation of the BigInteger parameter
+ */
+ static byte[] toIntegerBytes(final BigInteger bigInt) {
+ int bitlen = bigInt.bitLength();
+ // round bitlen
+ bitlen = ((bitlen + 7) >> 3) << 3;
+ final byte[] bigBytes = bigInt.toByteArray();
+
+ if (((bigInt.bitLength() % 8) != 0) && (((bigInt.bitLength() / 8) + 1) == (bitlen / 8))) {
+ return bigBytes;
+ }
+ // set up params for copying everything but sign bit
+ int startSrc = 0;
+ int len = bigBytes.length;
+
+ // if bigInt is exactly byte-aligned, just skip signbit in copy
+ if ((bigInt.bitLength() % 8) == 0) {
+ startSrc = 1;
+ len--;
+ }
+ final int startDst = bitlen / 8 - len; // to pad w/ nulls as per spec
+ final byte[] resizedBytes = new byte[bitlen / 8];
+ System.arraycopy(bigBytes, startSrc, resizedBytes, startDst, len);
+ return resizedBytes;
+ }
+
+ /**
+ * Resets this Base64 object to its initial newly constructed state.
+ */
+ private void reset() {
+ buffer = null;
+ pos = 0;
+ readPos = 0;
+ currentLinePos = 0;
+ modulus = 0;
+ eof = false;
+ }
+
+ // Getters for use in testing
+
+ int getLineLength() {
+ return lineLength;
+ }
+
+ byte[] getLineSeparator() {
+ return lineSeparator.clone();
+ }
+}
diff --git a/libraries/mogo-adas/src/main/java/com/zhidao/support/adas/high/common/RSATool.java b/libraries/mogo-adas/src/main/java/com/zhidao/support/adas/high/common/RSATool.java
index 443eaba2ba..7f112faf19 100644
--- a/libraries/mogo-adas/src/main/java/com/zhidao/support/adas/high/common/RSATool.java
+++ b/libraries/mogo-adas/src/main/java/com/zhidao/support/adas/high/common/RSATool.java
@@ -2,7 +2,6 @@ package com.zhidao.support.adas.high.common;
import android.util.Log;
-import org.apache.commons.net.util.Base64;
import java.nio.charset.StandardCharsets;
import java.security.Key;