DES：

package com.chinacreator.videoalliance.util;import java.net.URLDecoder;
import java.security.Key;import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;public class DesUtil {private static final String SECRET_KEY_TYPE = "DES";private static final String ECB_MOB = "DES/ECB/PKCS5Padding";private static final String CHAESET_NAME = "UTF-8";private static Key getKey(String password) throws Exception{byte[] DESkey = password.getBytes(CHAESET_NAME);DESKeySpec keySpec = new DESKeySpec(DESkey);SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(SECRET_KEY_TYPE);return keyFactory.generateSecret(keySpec);}public static String encode(String data, String password) throws Exception {Cipher enCipher = Cipher.getInstance(ECB_MOB);Key key = getKey(password);enCipher.init(Cipher.ENCRYPT_MODE, key);byte[] pasByte = enCipher.doFinal(data.getBytes(CHAESET_NAME));return Base64.encodeBase64String(pasByte);}public static String decode(String data, String password) throws Exception {Cipher deCipher = Cipher.getInstance(ECB_MOB);Key key = getKey(password);deCipher.init(Cipher.DECRYPT_MODE, key);byte[] pasByte = deCipher.doFinal(Base64.decodeBase64(data.getBytes(CHAESET_NAME)));return new String(pasByte, CHAESET_NAME);}public static void main(String[] args) throws Exception{String usermob = URLDecoder.decode("PgZPqVNxzxPSo%2FlxJTBqjQ%3D%3D", "UTF-8");System.out.println(usermob);String userid = decode(usermob, "sohu1234");System.out.println(userid);System.out.println(encode("18655191114", "sohu1234"));}
}

Md5：

package com.chinacreator.videoalliance.util;import java.io.UnsupportedEncodingException;
import java.util.Arrays;import org.apache.commons.codec.DecoderException;
import org.apache.commons.codec.EncoderException;public class Base64 extends BaseNCodec {/*** BASE32 characters are 6 bits in length. They are formed by taking a block* of 3 octets to form a 24-bit string, which is converted into 4 BASE64* characters.*/private static final int BITS_PER_ENCODED_BYTE = 6;private static final int BYTES_PER_UNENCODED_BLOCK = 3;private static final int BYTES_PER_ENCODED_BLOCK = 4;/*** Chunk separator per RFC 2045 section 2.1.* * <p>* N.B. The next major release may break compatibility and make this field* private.* </p>*/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.*/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', '-', '_' };/*** 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).* */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 };/*** Base64 uses 6-bit fields.*//** Mask used to extract 6 bits, used when encoding */private static final int MASK_6BITS = 0x3f;// 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;// Only one decode table currently; keep for consistency with Base32 codeprivate final byte[] decodeTable = DECODE_TABLE;/*** 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.* <code>decodeSize = 3 + lineSeparator.length;</code>*/private final int decodeSize;/*** Convenience variable to help us determine when our buffer is going to run* out of room and needs resizing.* <code>encodeSize = 4 + lineSeparator.length;</code>*/private final int encodeSize;/*** Creates a Base64 codec used for decoding (all modes) and encoding in* URL-unsafe mode.* <p>* When encoding the line length is 0 (no chunking), and the encoding table* is STANDARD_ENCODE_TABLE.* </p>* * <p>* When decoding all variants are supported.* </p>*/public Base64() {this(0);}/*** Creates a Base64 codec used for decoding (all modes) and encoding in the* given URL-safe mode.* <p>* When encoding the line length is 76, the line separator is CRLF, and the* encoding table is STANDARD_ENCODE_TABLE.* </p>* * <p>* When decoding all variants are supported.* </p>* * @param urlSafe*            if {@code true}, URL-safe encoding is used. In most cases this*            should be set to {@code false}.* @since 1.4*/public Base64(final boolean urlSafe) {this(MIME_CHUNK_SIZE, CHUNK_SEPARATOR, urlSafe);}/*** Creates a Base64 codec used for decoding (all modes) and encoding in* URL-unsafe mode.* <p>* When encoding the line length is given in the constructor, the line* separator is CRLF, and the encoding table is STANDARD_ENCODE_TABLE.* </p>* <p>* Line lengths that aren't multiples of 4 will still essentially end up* being multiples of 4 in the encoded data.* </p>* <p>* When decoding all variants are supported.* </p>* * @param lineLength*            Each line of encoded data will be at most of the given length*            (rounded down to nearest multiple of 4). If lineLength <= 0,*            then the output will not be divided into lines (chunks).*            Ignored when decoding.*/public Base64(final int lineLength) {this(lineLength, CHUNK_SEPARATOR);}/*** Creates a Base64 codec used for decoding (all modes) and encoding in* URL-unsafe mode.* <p>* When encoding the line length and line separator are given in the* constructor, and the encoding table is STANDARD_ENCODE_TABLE.* </p>* <p>* Line lengths that aren't multiples of 4 will still essentially end up* being multiples of 4 in the encoded data.* </p>* <p>* When decoding all variants are supported.* </p>* * @param lineLength*            Each line of encoded data will be at most of the given length*            (rounded down to nearest multiple of 4). If 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.*/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.* <p>* When encoding the line length and line separator are given in the* constructor, and the encoding table is STANDARD_ENCODE_TABLE.* </p>* <p>* Line lengths that aren't multiples of 4 will still essentially end up* being multiples of 4 in the encoded data.* </p>* <p>* When decoding all variants are supported.* </p>* * @param lineLength*            Each line of encoded data will be at most of the given length*            (rounded down to nearest multiple of 4). If 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. <b>Note: no padding is*            added when using the URL-safe alphabet.</b>* @throws IllegalArgumentException*             The provided lineSeparator included some base64 characters.*             That's not going to work!*/public Base64(final int lineLength, final byte[] lineSeparator, final boolean urlSafe) {super(BYTES_PER_UNENCODED_BLOCK, BYTES_PER_ENCODED_BLOCK, lineLength, lineSeparator == null ? 0 : lineSeparator.length);// TODO could be simplified if there is no requirement to reject invalid// line sep when length <=0// @see test case Base64Test.testConstructors()if (lineSeparator != null) {if (containsAlphabetOrPad(lineSeparator)) {try {final String sep = new String(lineSeparator, "UTF-8");throw new IllegalArgumentException("lineSeparator must not contain base64 characters: [" + sep + "]");} catch (UnsupportedEncodingException e) {e.printStackTrace();}}if (lineLength > 0) { // null line-sep forces no chunking rather// than throwing IAEthis.encodeSize = BYTES_PER_ENCODED_BLOCK + lineSeparator.length;this.lineSeparator = new byte[lineSeparator.length];System.arraycopy(lineSeparator, 0, this.lineSeparator, 0, lineSeparator.length);} else {this.encodeSize = BYTES_PER_ENCODED_BLOCK;this.lineSeparator = null;}} else {this.encodeSize = BYTES_PER_ENCODED_BLOCK;this.lineSeparator = null;}this.decodeSize = this.encodeSize - 1;this.encodeTable = urlSafe ? URL_SAFE_ENCODE_TABLE : STANDARD_ENCODE_TABLE;}/*** <p>* 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, to* flush last remaining bytes (if not multiple of 3).* </p>* <p>* <b>Note: no padding is added when encoding using the URL-safe* alphabet.</b>* </p>* * @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.* @param context*            the context to be used*/@Overridevoid encode(final byte[] in, int inPos, final int inAvail, final Context context) {if (context.eof) {return;}// inAvail < 0 is how we're informed of EOF in the underlying data we're// encoding.if (inAvail < 0) {context.eof = true;if (0 == context.modulus && lineLength == 0) {return; // no leftovers to process and not using chunking}final byte[] buffer = ensureBufferSize(encodeSize, context);final int savedPos = context.pos;switch (context.modulus) { // 0-2case 0: // nothing to do herebreak;case 1: // 8 bits = 6 + 2// top 6 bits:buffer[context.pos++] = encodeTable[(context.ibitWorkArea >> 2) & MASK_6BITS];// remaining 2:buffer[context.pos++] = encodeTable[(context.ibitWorkArea << 4) & MASK_6BITS];// URL-SAFE skips the padding to further reduce size.if (encodeTable == STANDARD_ENCODE_TABLE) {buffer[context.pos++] = PAD;buffer[context.pos++] = PAD;}break;case 2: // 16 bits = 6 + 6 + 4buffer[context.pos++] = encodeTable[(context.ibitWorkArea >> 10) & MASK_6BITS];buffer[context.pos++] = encodeTable[(context.ibitWorkArea >> 4) & MASK_6BITS];buffer[context.pos++] = encodeTable[(context.ibitWorkArea << 2) & MASK_6BITS];// URL-SAFE skips the padding to further reduce size.if (encodeTable == STANDARD_ENCODE_TABLE) {buffer[context.pos++] = PAD;}break;default:throw new IllegalStateException("Impossible modulus " + context.modulus);}context.currentLinePos += context.pos - savedPos; // keep track of// current line// position// if currentPos == 0 we are at the start of a line, so don't add// CRLFif (lineLength > 0 && context.currentLinePos > 0) {System.arraycopy(lineSeparator, 0, buffer, context.pos, lineSeparator.length);context.pos += lineSeparator.length;}} else {for (int i = 0; i < inAvail; i++) {final byte[] buffer = ensureBufferSize(encodeSize, context);context.modulus = (context.modulus + 1) % BYTES_PER_UNENCODED_BLOCK;int b = in[inPos++];if (b < 0) {b += 256;}context.ibitWorkArea = (context.ibitWorkArea << 8) + b; // BITS_PER_BYTEif (0 == context.modulus) { // 3 bytes = 24 bits = 4 * 6 bits to// extractbuffer[context.pos++] = encodeTable[(context.ibitWorkArea >> 18) & MASK_6BITS];buffer[context.pos++] = encodeTable[(context.ibitWorkArea >> 12) & MASK_6BITS];buffer[context.pos++] = encodeTable[(context.ibitWorkArea >> 6) & MASK_6BITS];buffer[context.pos++] = encodeTable[context.ibitWorkArea & MASK_6BITS];context.currentLinePos += BYTES_PER_ENCODED_BLOCK;if (lineLength > 0 && lineLength <= context.currentLinePos) {System.arraycopy(lineSeparator, 0, buffer, context.pos, lineSeparator.length);context.pos += lineSeparator.length;context.currentLinePos = 0;}}}}}/*** <p>* 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.* </p>* <p>* 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.* </p>* * @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.* @param context*            the context to be used*/@Overridevoid decode(final byte[] in, int inPos, final int inAvail, final Context context) {if (context.eof) {return;}if (inAvail < 0) {context.eof = true;}for (int i = 0; i < inAvail; i++) {final byte[] buffer = ensureBufferSize(decodeSize, context);final byte b = in[inPos++];if (b == PAD) {// We're done.context.eof = true;break;} else {if (b >= 0 && b < DECODE_TABLE.length) {final int result = DECODE_TABLE[b];if (result >= 0) {context.modulus = (context.modulus + 1) % BYTES_PER_ENCODED_BLOCK;context.ibitWorkArea = (context.ibitWorkArea << BITS_PER_ENCODED_BYTE) + result;if (context.modulus == 0) {buffer[context.pos++] = (byte) ((context.ibitWorkArea >> 16) & MASK_8BITS);buffer[context.pos++] = (byte) ((context.ibitWorkArea >> 8) & MASK_8BITS);buffer[context.pos++] = (byte) (context.ibitWorkArea & 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 (context.eof && context.modulus != 0) {final byte[] buffer = ensureBufferSize(decodeSize, context);// We have some spare bits remaining// Output all whole multiples of 8 bits and ignore the restswitch (context.modulus) {// case 0 : // impossible, as excluded abovecase 1: // 6 bits - ignore entirely// TODO not currently tested; perhaps it is impossible?break;case 2: // 12 bits = 8 + 4context.ibitWorkArea = context.ibitWorkArea >> 4; // dump the// extra 4// bitsbuffer[context.pos++] = (byte) ((context.ibitWorkArea) & MASK_8BITS);break;case 3: // 18 bits = 8 + 8 + 2context.ibitWorkArea = context.ibitWorkArea >> 2; // dump 2 bitsbuffer[context.pos++] = (byte) ((context.ibitWorkArea >> 8) & MASK_8BITS);buffer[context.pos++] = (byte) ((context.ibitWorkArea) & MASK_8BITS);break;default:throw new IllegalStateException("Impossible modulus " + context.modulus);}}}/*** 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 but does not chunk the* output.* * NOTE: We changed the behaviour of this method from multi-line chunking* * @param binaryData*            binary data to encode* @return String containing Base64 characters.* @throws UnsupportedEncodingException */public static String encodeBase64String(final byte[] binaryData) throws UnsupportedEncodingException {return new String(encodeBase64(binaryData, false), "UTF-8");}/*** 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. <b>Note: no padding is added.</b>* * @param binaryData*            binary data to encode* @return byte[] containing Base64 characters in their UTF-8*         representation.*/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. <b>Note: no padding is added.</b>* * @param binaryData*            binary data to encode* @return String containing Base64 characters* @throws UnsupportedEncodingException */public static String encodeBase64URLSafeString(final byte[] binaryData) throws UnsupportedEncodingException {return new String(encodeBase64(binaryData, false, true), "UTF-8");}/*** 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);}/*** 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 {@code 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 {@code true} this encoder will chunk the base64 output into*            76 character blocks* @param urlSafe*            if {@code true} this encoder will emit - and _ instead of the*            usual + and / characters. <b>Note: no padding is added when*            encoding using the URL-safe alphabet.</b>* @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, 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 {@code true} this encoder will chunk the base64 output into*            76 character blocks* @param urlSafe*            if {@code true} this encoder will emit - and _ instead of the*            usual + and / characters. <b>Note: no padding is added when*            encoding using the URL-safe alphabet.</b>* @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*/public static byte[] encodeBase64(final byte[] binaryData, final boolean isChunked, final boolean urlSafe, final int maxResultSize) {if (binaryData == null || binaryData.length == 0) {return binaryData;}// Create this so can use the super-class method// Also ensures that the same roundings are performed by the ctor and// the codefinal Base64 b64 = isChunked ? new Base64(urlSafe) : new Base64(0, CHUNK_SEPARATOR, urlSafe);final long len = b64.getEncodedLength(binaryData);if (len > maxResultSize) {throw new IllegalArgumentException("Input array too big, the output array would be bigger (" + len + ") than the specified maximum size of " + maxResultSize);}return b64.encode(binaryData);}/*** Decodes a Base64 String into octets* * @param base64String*            String containing Base64 data* @return Array containing decoded data.* @throws UnsupportedEncodingException*/public static byte[] decodeBase64(final String base64String) throws UnsupportedEncodingException {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);}/*** Returns whether or not the <code>octet</code> is in the Base64 alphabet.* * @param octet*            The value to test* @return {@code true} if the value is defined in the the Base64 alphabet*         {@code false} otherwise.*/@Overrideprotected boolean isInAlphabet(final byte octet) {return octet >= 0 && octet < decodeTable.length && decodeTable[octet] != -1;}
}abstract class BaseNCodec {static class Context {/*** Place holder for the bytes we're dealing with for our based logic.* Bitwise operations store and extract the encoding or decoding from this variable.*/int ibitWorkArea;/*** Place holder for the bytes we're dealing with for our based logic.* Bitwise operations store and extract the encoding or decoding from this variable.*/long lbitWorkArea;/*** Buffer for streaming.*/byte[] buffer;/*** Position where next character should be written in the buffer.*/int pos;/*** Position where next character should be read from the buffer.*/int readPos;/*** Boolean flag to indicate the EOF has been reached. Once EOF has been reached, this object becomes useless,* and must be thrown away.*/boolean eof;/*** 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).*/int currentLinePos;/*** Writes to the buffer only occur after every 3/5 reads when encoding, and every 4/8 reads when decoding. This* variable helps track that.*/int modulus;Context() {}/*** Returns a String useful for debugging (especially within a debugger.)** @return a String useful for debugging.*/@SuppressWarnings("boxing") // OK to ignore boxing here@Overridepublic String toString() {return String.format("%s[buffer=%s, currentLinePos=%s, eof=%s, ibitWorkArea=%s, lbitWorkArea=%s, " +"modulus=%s, pos=%s, readPos=%s]", this.getClass().getSimpleName(), Arrays.toString(buffer),currentLinePos, eof, ibitWorkArea, lbitWorkArea, modulus, pos, readPos);}}/*** EOF*/static final int EOF = -1;/***  MIME chunk size per RFC 2045 section 6.8.*/public static final int MIME_CHUNK_SIZE = 76;/*** PEM chunk size per RFC 1421 section 4.3.2.4.*/public static final int PEM_CHUNK_SIZE = 64;private static final int DEFAULT_BUFFER_RESIZE_FACTOR = 2;/*** Defines the default buffer size - currently {@value}* - must be large enough for at least one encoded block+separator*/private static final int DEFAULT_BUFFER_SIZE = 8192;/** Mask used to extract 8 bits, used in decoding bytes */protected static final int MASK_8BITS = 0xff;/*** Byte used to pad output.*/protected static final byte PAD_DEFAULT = '='; // Allow static access to defaultprotected final byte PAD = PAD_DEFAULT; // instance variable just in case it needs to vary later/** Number of bytes in each full block of unencoded data, e.g. 4 for Base64 and 5 for Base32 */private final int unencodedBlockSize;/** Number of bytes in each full block of encoded data, e.g. 3 for Base64 and 8 for Base32 */private final int encodedBlockSize;/*** Chunksize for encoding. Not used when decoding.* A value of zero or less implies no chunking of the encoded data.* Rounded down to nearest multiple of encodedBlockSize.*/protected final int lineLength;/*** Size of chunk separator. Not used unless {@link #lineLength} > 0.*/private final int chunkSeparatorLength;/*** Note <code>lineLength</code> is rounded down to the nearest multiple of {@link #encodedBlockSize}* If <code>chunkSeparatorLength</code> is zero, then chunking is disabled.* @param unencodedBlockSize the size of an unencoded block (e.g. Base64 = 3)* @param encodedBlockSize the size of an encoded block (e.g. Base64 = 4)* @param lineLength if &gt; 0, use chunking with a length <code>lineLength</code>* @param chunkSeparatorLength the chunk separator length, if relevant*/protected BaseNCodec(final int unencodedBlockSize, final int encodedBlockSize,final int lineLength, final int chunkSeparatorLength) {this.unencodedBlockSize = unencodedBlockSize;this.encodedBlockSize = encodedBlockSize;final boolean useChunking = lineLength > 0 && chunkSeparatorLength > 0;this.lineLength = useChunking ? (lineLength / encodedBlockSize) * encodedBlockSize : 0;this.chunkSeparatorLength = chunkSeparatorLength;}/*** Returns true if this object has buffered data for reading.** @param context the context to be used* @return true if there is data still available for reading.*/boolean hasData(final Context context) {  // package protected for access from I/O streamsreturn context.buffer != null;}/*** Returns the amount of buffered data available for reading.** @param context the context to be used* @return The amount of buffered data available for reading.*/int available(final Context context) {  // package protected for access from I/O streamsreturn context.buffer != null ? context.pos - context.readPos : 0;}/*** Get the default buffer size. Can be overridden.** @return {@link #DEFAULT_BUFFER_SIZE}*/protected int getDefaultBufferSize() {return DEFAULT_BUFFER_SIZE;}/*** Increases our buffer by the {@link #DEFAULT_BUFFER_RESIZE_FACTOR}.* @param context the context to be used*/private byte[] resizeBuffer(final Context context) {if (context.buffer == null) {context.buffer = new byte[getDefaultBufferSize()];context.pos = 0;context.readPos = 0;} else {final byte[] b = new byte[context.buffer.length * DEFAULT_BUFFER_RESIZE_FACTOR];System.arraycopy(context.buffer, 0, b, 0, context.buffer.length);context.buffer = b;}return context.buffer;}/*** Ensure that the buffer has room for <code>size</code> bytes** @param size minimum spare space required* @param context the context to be used*/protected byte[] ensureBufferSize(final int size, final Context context){if ((context.buffer == null) || (context.buffer.length < context.pos + size)){return resizeBuffer(context);}return context.buffer;}/*** 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.* <p>* Package protected for access from I/O streams.** @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).* @param context*            the context to be used* @return The number of bytes successfully extracted into the provided byte[] array.*/int readResults(final byte[] b, final int bPos, final int bAvail, final Context context) {if (context.buffer != null) {final int len = Math.min(available(context), bAvail);System.arraycopy(context.buffer, context.readPos, b, bPos, len);context.readPos += len;if (context.readPos >= context.pos) {context.buffer = null; // so hasData() will return false, and this method can return -1}return len;}return context.eof ? EOF : 0;}/*** Checks if a byte value is whitespace or not.* Whitespace is taken to mean: space, tab, CR, LF* @param byteToCheck*            the byte to check* @return true if byte is whitespace, false otherwise*/protected static boolean isWhiteSpace(final byte byteToCheck) {switch (byteToCheck) {case ' ' :case '\n' :case '\r' :case '\t' :return true;default :return false;}}/*** Encodes an Object using the Base-N algorithm. This method is provided in order to satisfy the requirements of* the Encoder interface, and will throw an EncoderException if the supplied object is not of type byte[].** @param obj*            Object to encode* @return An object (of type byte[]) containing the Base-N encoded data which corresponds to the byte[] supplied.* @throws EncoderException*             if the parameter supplied is not of type byte[]*/public Object encode(final Object obj) throws Exception {if (!(obj instanceof byte[])) {throw new Exception("Parameter supplied to Base-N encode is not a byte[]");}return encode((byte[]) obj);}/*** Encodes a byte[] containing binary data, into a String containing characters in the Base-N alphabet.* Uses UTF8 encoding.** @param pArray*            a byte array containing binary data* @return A String containing only Base-N character data* @throws UnsupportedEncodingException */public String encodeToString(final byte[] pArray) throws UnsupportedEncodingException {return new String(encode(pArray), "UTF-8");}/*** Encodes a byte[] containing binary data, into a String containing characters in the appropriate alphabet.* Uses UTF8 encoding.** @param pArray a byte array containing binary data* @return String containing only character data in the appropriate alphabet.* @throws UnsupportedEncodingException */public String encodeAsString(final byte[] pArray) throws UnsupportedEncodingException{return new String(encode(pArray), "UTF-8");}/*** Decodes an Object using the Base-N algorithm. This method is provided in order to satisfy the requirements of* the Decoder interface, and will throw a DecoderException if the supplied object is not of type byte[] or String.** @param obj*            Object to decode* @return An object (of type byte[]) containing the binary data which corresponds to the byte[] or String*         supplied.* @throws DecoderException*             if the parameter supplied is not of type byte[]*/public Object decode(final Object obj) throws Exception {if (obj instanceof byte[]) {return decode((byte[]) obj);} else if (obj instanceof String) {return decode((String) obj);} else {throw new Exception("Parameter supplied to Base-N decode is not a byte[] or a String");}}/*** Decodes a String containing characters in the Base-N alphabet.** @param pArray*            A String containing Base-N character data* @return a byte array containing binary data* @throws UnsupportedEncodingException */public byte[] decode(final String pArray) throws UnsupportedEncodingException {return decode(pArray.getBytes("UTF-8"));}/*** Decodes a byte[] containing characters in the Base-N alphabet.** @param pArray*            A byte array containing Base-N character data* @return a byte array containing binary data*/public byte[] decode(final byte[] pArray) {if (pArray == null || pArray.length == 0) {return pArray;}final Context context = new Context();decode(pArray, 0, pArray.length, context);decode(pArray, 0, EOF, context); // Notify decoder of EOF.final byte[] result = new byte[context.pos];readResults(result, 0, result.length, context);return result;}/*** Encodes a byte[] containing binary data, into a byte[] containing characters in the alphabet.** @param pArray*            a byte array containing binary data* @return A byte array containing only the basen alphabetic character data*/public byte[] encode(final byte[] pArray) {if (pArray == null || pArray.length == 0) {return pArray;}final Context context = new Context();encode(pArray, 0, pArray.length, context);encode(pArray, 0, EOF, context); // Notify encoder of EOF.final byte[] buf = new byte[context.pos - context.readPos];readResults(buf, 0, buf.length, context);return buf;}// package protected for access from I/O streamsabstract void encode(byte[] pArray, int i, int length, Context context);// package protected for access from I/O streamsabstract void decode(byte[] pArray, int i, int length, Context context);/*** Returns whether or not the <code>octet</code> is in the current alphabet.* Does not allow whitespace or pad.** @param value The value to test** @return {@code true} if the value is defined in the current alphabet, {@code false} otherwise.*/protected abstract boolean isInAlphabet(byte value);/*** Tests a given byte array to see if it contains only valid characters within the alphabet.* The method optionally treats whitespace and pad as valid.** @param arrayOctet byte array to test* @param allowWSPad if {@code true}, then whitespace and PAD are also allowed** @return {@code true} if all bytes are valid characters in the alphabet or if the byte array is empty;*         {@code false}, otherwise*/public boolean isInAlphabet(final byte[] arrayOctet, final boolean allowWSPad) {for (int i = 0; i < arrayOctet.length; i++) {if (!isInAlphabet(arrayOctet[i]) &&(!allowWSPad || (arrayOctet[i] != PAD) && !isWhiteSpace(arrayOctet[i]))) {return false;}}return true;}/*** Tests a given String to see if it contains only valid characters within the alphabet.* The method treats whitespace and PAD as valid.** @param basen String to test* @return {@code true} if all characters in the String are valid characters in the alphabet or if*         the String is empty; {@code false}, otherwise* @throws UnsupportedEncodingException * @see #isInAlphabet(byte[], boolean)*/public boolean isInAlphabet(final String basen) throws UnsupportedEncodingException {return isInAlphabet(basen.getBytes("UTF-8"), true);}/*** Tests a given byte array to see if it contains any characters within the alphabet or PAD.** Intended for use in checking line-ending arrays** @param arrayOctet*            byte array to test* @return {@code true} if any byte is a valid character in the alphabet or PAD; {@code false} otherwise*/protected boolean containsAlphabetOrPad(final byte[] arrayOctet) {if (arrayOctet == null) {return false;}for (final byte element : arrayOctet) {if (PAD == element || isInAlphabet(element)) {return true;}}return false;}/*** Calculates the amount of space needed to encode the supplied array.** @param pArray byte[] array which will later be encoded** @return amount of space needed to encoded the supplied array.* Returns a long since a max-len array will require > Integer.MAX_VALUE*/public long getEncodedLength(final byte[] pArray) {// Calculate non-chunked size - rounded up to allow for padding// cast to long is needed to avoid possibility of overflowlong len = ((pArray.length + unencodedBlockSize-1)  / unencodedBlockSize) * (long) encodedBlockSize;if (lineLength > 0) { // We're using chunking// Round up to nearest multiplelen += ((len + lineLength-1) / lineLength) * chunkSeparatorLength;}return len;}}