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php、java、android、ios通用的3des方法(推荐)
站长资源 2024/11/27 佚名
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php服务器，java服务器，android，ios开发兼容的3des加密解密，

php 

<"my.oschina.net/penngo";
	var $iv = "01234567";

	function encrypt($input){
		$size = mcrypt_get_block_size(MCRYPT_3DES,MCRYPT_MODE_CBC);
		$input = $this->pkcs5_pad($input, $size);
		$key = str_pad($this->key,24,'0');
		$td = mcrypt_module_open(MCRYPT_3DES, '', MCRYPT_MODE_CBC, '');
		if( $this->iv == '' )
		{
			$iv = @mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
		}
		else
		{
			$iv = $this->iv;
		}
		@mcrypt_generic_init($td, $key, $iv);
		$data = mcrypt_generic($td, $input);
		mcrypt_generic_deinit($td);
		mcrypt_module_close($td);
		$data = base64_encode($data);
		return $data;
	}
	function decrypt($encrypted){
		$encrypted = base64_decode($encrypted);
		$key = str_pad($this->key,24,'0');
		$td = mcrypt_module_open(MCRYPT_3DES,'',MCRYPT_MODE_CBC,'');
		if( $this->iv == '' )
		{
			$iv = @mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
		}
		else
		{
			$iv = $this->iv;
		}
		$ks = mcrypt_enc_get_key_size($td);
		@mcrypt_generic_init($td, $key, $iv);
		$decrypted = mdecrypt_generic($td, $encrypted);
		mcrypt_generic_deinit($td);
		mcrypt_module_close($td);
		$y=$this->pkcs5_unpad($decrypted);
		return $y;
	}
	function pkcs5_pad ($text, $blocksize) {
		$pad = $blocksize - (strlen($text) % $blocksize);
		return $text . str_repeat(chr($pad), $pad);
	}
	function pkcs5_unpad($text){
		$pad = ord($text{strlen($text)-1});
		if ($pad > strlen($text)) {
			return false;
		}
		if (strspn($text, chr($pad), strlen($text) - $pad) != $pad){
			return false;
		}
		return substr($text, 0, -1 * $pad);
	}
	function PaddingPKCS7($data) {
		$block_size = mcrypt_get_block_size(MCRYPT_3DES, MCRYPT_MODE_CBC);
		$padding_char = $block_size - (strlen($data) % $block_size);
		$data .= str_repeat(chr($padding_char),$padding_char);
		return $data;
	}
}

$des = new DES3();
echo $ret = $des->encrypt("来自http://jb51.net的博客") . "\n";
echo $des->decrypt($ret) . "\n";

 java(android)

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.security.Key; 

import javax.crypto.Cipher; 
import javax.crypto.SecretKeyFactory; 
import javax.crypto.spec.DESedeKeySpec; 
import javax.crypto.spec.IvParameterSpec; 
    
/** 
 * 3DES加密工具类 
 */ 
public class DES3 { 
   // 密钥 
   private final static String secretKey = "my.oschina.net/penngo" ;  
   // 向量 
   private final static String iv = "01234567" ; 
   // 加解密统一使用的编码方式 
   private final static String encoding = "utf-8" ; 
    
   /** 
   * 3DES加密 
   * 
   * @param plainText 普通文本 
   * @return 
   * @throws Exception 
   */ 
   public static String encode(String plainText) throws Exception { 
     Key deskey = null ; 
     DESedeKeySpec spec = new DESedeKeySpec(secretKey.getBytes()); 
     SecretKeyFactory keyfactory = SecretKeyFactory.getInstance( "desede" ); 
     deskey = keyfactory.generateSecret(spec); 
    
     Cipher cipher = Cipher.getInstance( "desede/CBC/PKCS5Padding" ); 
     IvParameterSpec ips = new IvParameterSpec(iv.getBytes()); 
     cipher.init(Cipher.ENCRYPT_MODE, deskey, ips); 
     byte [] encryptData = cipher.doFinal(plainText.getBytes(encoding)); 
     return Base64.encode(encryptData); 
   } 
    
   /** 
   * 3DES解密 
   * 
   * @param encryptText 加密文本 
   * @return 
   * @throws Exception 
   */ 
   public static String decode(String encryptText) throws Exception { 
     Key deskey = null ; 
     DESedeKeySpec spec = new DESedeKeySpec(secretKey.getBytes());  
     SecretKeyFactory keyfactory = SecretKeyFactory.getInstance( "desede" ); 
     deskey = keyfactory.generateSecret(spec); 
     Cipher cipher = Cipher.getInstance( "desede/CBC/PKCS5Padding" ); 
     IvParameterSpec ips = new IvParameterSpec(iv.getBytes()); 
     cipher.init(Cipher.DECRYPT_MODE, deskey, ips); 
    
     byte [] decryptData = cipher.doFinal(Base64.decode(encryptText)); 
    
     return new String(decryptData, encoding); 
   } 
   
 	public static String padding(String str) {
		byte[] oldByteArray;
		try {
			oldByteArray = str.getBytes("UTF8");
			int numberToPad = 8 - oldByteArray.length % 8;
			byte[] newByteArray = new byte[oldByteArray.length + numberToPad];
			System.arraycopy(oldByteArray, 0, newByteArray, 0,
					oldByteArray.length);
			for (int i = oldByteArray.length; i < newByteArray.length; ++i) {
				newByteArray[i] = 0;
			}
			return new String(newByteArray, "UTF8");
		} catch (UnsupportedEncodingException e) {
			System.out.println("Crypter.padding UnsupportedEncodingException");
		}
		return null;
	}
	
	/** 
	 * Base64编码工具类 
	 * 
	 */ 
	public static class Base64 { 
	   private static final char [] legalChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" .toCharArray(); 
	    
	   public static String encode( byte [] data) { 
	     int start = 0 ; 
	     int len = data.length; 
	     StringBuffer buf = new StringBuffer(data.length * 3 / 2 ); 
	    
	     int end = len - 3 ; 
	     int i = start; 
	     int n = 0 ; 
	    
	     while (i <= end) { 
	       int d = (((( int ) data[i]) & 0x0ff ) << 16 ) | (((( int ) data[i + 1 ]) & 0x0ff ) << 8 ) | ((( int ) data[i + 2 ]) & 0x0ff ); 
	    
	       buf.append(legalChars[(d  18 ) & 63 ]); 
	       buf.append(legalChars[(d  12 ) & 63 ]); 
	       buf.append(legalChars[(d  6 ) & 63 ]); 
	       buf.append(legalChars[d & 63 ]); 
	    
	       i += 3 ; 
	    
	       if (n++ >= 14 ) { 
	         n = 0 ; 
	         buf.append( " " ); 
	       } 
	     } 
	    
	     if (i == start + len - 2 ) { 
	       int d = (((( int ) data[i]) & 0x0ff ) << 16 ) | (((( int ) data[i + 1 ]) & 255 ) << 8 ); 
	    
	       buf.append(legalChars[(d  18 ) & 63 ]); 
	       buf.append(legalChars[(d  12 ) & 63 ]); 
	       buf.append(legalChars[(d  6 ) & 63 ]); 
	       buf.append( "=" ); 
	     } else if (i == start + len - 1 ) { 
	       int d = ((( int ) data[i]) & 0x0ff ) << 16 ; 
	    
	       buf.append(legalChars[(d  18 ) & 63 ]); 
	       buf.append(legalChars[(d  12 ) & 63 ]); 
	       buf.append( "==" ); 
	     } 
	    
	     return buf.toString(); 
	   } 
	    
	   private static int decode( char c) { 
	     if (c >= 'A' && c <= 'Z' ) 
	       return (( int ) c) - 65 ; 
	     else if (c >= 'a' && c <= 'z' ) 
	       return (( int ) c) - 97 + 26 ; 
	     else if (c >= '0' && c <= '9' ) 
	       return (( int ) c) - 48 + 26 + 26 ; 
	     else 
	       switch (c) { 
	       case '+' : 
	         return 62 ; 
	       case '/' : 
	         return 63 ; 
	       case '=' : 
	         return 0 ; 
	       default : 
	         throw new RuntimeException( "unexpected code: " + c); 
	       } 
	   } 
	    
	   /** 
	   * Decodes the given Base64 encoded String to a new byte array. The byte array holding the decoded data is returned. 
	   */ 
	    
	   public static byte [] decode(String s) { 
	    
	     ByteArrayOutputStream bos = new ByteArrayOutputStream(); 
	     try { 
	       decode(s, bos); 
	     } catch (IOException e) { 
	       throw new RuntimeException(); 
	     } 
	     byte [] decodedBytes = bos.toByteArray(); 
	     try { 
	       bos.close(); 
	       bos = null ; 
	     } catch (IOException ex) { 
	       System.err.println( "Error while decoding BASE64: " + ex.toString()); 
	     } 
	     return decodedBytes; 
	   } 
	    
	   private static void decode(String s, OutputStream os) throws IOException { 
	     int i = 0 ; 
	    
	     int len = s.length(); 
	    
	     while ( true ) { 
	       while (i < len && s.charAt(i) <= ' ' ) 
	         i++; 
	    
	       if (i == len) 
	         break ; 
	    
	       int tri = (decode(s.charAt(i)) << 18 ) + (decode(s.charAt(i + 1 )) << 12 ) + (decode(s.charAt(i + 2 )) << 6 ) + (decode(s.charAt(i + 3 ))); 
	    
	       os.write((tri  16 ) & 255 ); 
	       if (s.charAt(i + 2 ) == '=' ) 
	         break ; 
	       os.write((tri  8 ) & 255 ); 
	       if (s.charAt(i + 3 ) == '=' ) 
	         break ; 
	       os.write(tri & 255 ); 
	    
	       i += 4 ; 
	     } 
	   } 
	} 
   
   public static void main(String[] args) throws Exception{
  	 String plainText = "来自http://jb51.net的博客";
  	 String encryptText = DES3.encode(plainText);
  	 System.out.println(encryptText);
  	 System.out.println(DES3.decode(encryptText));

  	 
   }
}

 Ojbective-C(ios)

// 
// DES3Util.h 
// 
#import <Foundation/Foundation.h> 
@interface DES3Util : NSObject { 
} 
// 加密方法 
+ (NSString*)encrypt:(NSString*)plainText; 
// 解密方法 
+ (NSString*)decrypt:(NSString*)encryptText; 
@end 


// 
// DES3Util.m 
// 
    
#import "DES3Util.h" 
#import <CommonCrypto/CommonCryptor.h> 
#import "GTMBase64.h" 
#define gkey      @"my.oschina.net/penngo" 
#define gIv       @"01234567" 
    
@implementation DES3Util 
// 加密方法 
+ (NSString*)encrypt:(NSString*)plainText { 
   NSData* data = [plainText dataUsingEncoding:NSUTF8StringEncoding]; 
   size_t plainTextBufferSize = [data length]; 
   const void *vplainText = (const void *)[data bytes]; 
      
   CCCryptorStatus ccStatus; 
   uint8_t *bufferPtr = NULL; 
   size_t bufferPtrSize = 0; 
   size_t movedBytes = 0; 
      
   bufferPtrSize = (plainTextBufferSize + kCCBlockSize3DES) & ~(kCCBlockSize3DES - 1); 
   bufferPtr = malloc( bufferPtrSize * sizeof(uint8_t)); 
   memset((void *)bufferPtr, 0x0, bufferPtrSize); 
      
   const void *vkey = (const void *) [gkey UTF8String]; 
   const void *vinitVec = (const void *) [gIv UTF8String]; 
      
   ccStatus = CCCrypt(kCCEncrypt, 
            kCCAlgorithm3DES, 
            kCCOptionPKCS7Padding, 
            vkey, 
            kCCKeySize3DES, 
            vinitVec, 
            vplainText, 
            plainTextBufferSize, 
            (void *)bufferPtr, 
            bufferPtrSize, 
            &movedBytes); 
      
   NSData *myData = [NSData dataWithBytes:(const void *)bufferPtr length:(NSUInteger)movedBytes]; 
   NSString *result = [GTMBase64 stringByEncodingData:myData]; 
   return result; 
} 
    
// 解密方法 
+ (NSString*)decrypt:(NSString*)encryptText { 
   NSData *encryptData = [GTMBase64 decodeData:[encryptText dataUsingEncoding:NSUTF8StringEncoding]]; 
   size_t plainTextBufferSize = [encryptData length]; 
   const void *vplainText = [encryptData bytes]; 
      
   CCCryptorStatus ccStatus; 
   uint8_t *bufferPtr = NULL; 
   size_t bufferPtrSize = 0; 
   size_t movedBytes = 0; 
   bufferPtrSize = (plainTextBufferSize + kCCBlockSize3DES) & ~(kCCBlockSize3DES - 1); 
   bufferPtr = malloc( bufferPtrSize * sizeof(uint8_t)); 
   memset((void *)bufferPtr, 0x0, bufferPtrSize);   
   const void *vkey = (const void *) [gkey UTF8String]; 
   const void *vinitVec = (const void *) [gIv UTF8String]; 
      
   ccStatus = CCCrypt(kCCDecrypt, 
            kCCAlgorithm3DES, 
            kCCOptionPKCS7Padding, 
            vkey, 
            kCCKeySize3DES, 
            vinitVec, 
            vplainText, 
            plainTextBufferSize, 
            (void *)bufferPtr, 
            bufferPtrSize, 
            &movedBytes); 
      
   NSString *result = [[[NSString alloc] initWithData:[NSData dataWithBytes:(const void *)bufferPtr  
                 length:(NSUInteger)movedBytes] encoding:NSUTF8StringEncoding] autorelease]; 
   return result; 
} 
    
@end






//
// GTMBase64.h
//
// Copyright 2006-2008 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy
// of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.

// David Lee make changes:
// Remove dependency on GTMDefines.h
// add some string to string function

#import <Foundation/Foundation.h>

// GTMBase64
//
/// Helper for handling Base64 and WebSafeBase64 encodings
//
/// The webSafe methods use different character set and also the results aren't
/// always padded to a multiple of 4 characters. This is done so the resulting
/// data can be used in urls and url query arguments without needing any
/// encoding. You must use the webSafe* methods together, the data does not
/// interop with the RFC methods.
//
@interface GTMBase64 : NSObject

//
// Standard Base64 (RFC) handling
//

// encodeData:
//
/// Base64 encodes contents of the NSData object.
//
/// Returns:
///  A new autoreleased NSData with the encoded payload. nil for any error.
//
+(NSData *)encodeData:(NSData *)data;

// decodeData:
//
/// Base64 decodes contents of the NSData object.
//
/// Returns:
///  A new autoreleased NSData with the decoded payload. nil for any error.
//
+(NSData *)decodeData:(NSData *)data;

// encodeBytes:length:
//
/// Base64 encodes the data pointed at by |bytes|.
//
/// Returns:
///  A new autoreleased NSData with the encoded payload. nil for any error.
//
+(NSData *)encodeBytes:(const void *)bytes length:(NSUInteger)length;

// decodeBytes:length:
//
/// Base64 decodes the data pointed at by |bytes|.
//
/// Returns:
///  A new autoreleased NSData with the encoded payload. nil for any error.
//
+(NSData *)decodeBytes:(const void *)bytes length:(NSUInteger)length;

// stringByEncodingData:
//
/// Base64 encodes contents of the NSData object.
//
/// Returns:
///  A new autoreleased NSString with the encoded payload. nil for any error.
//
+(NSString *)stringByEncodingData:(NSData *)data;

// stringByEncodingBytes:length:
//
/// Base64 encodes the data pointed at by |bytes|.
//
/// Returns:
///  A new autoreleased NSString with the encoded payload. nil for any error.
//
+(NSString *)stringByEncodingBytes:(const void *)bytes length:(NSUInteger)length;

// decodeString:
//
/// Base64 decodes contents of the NSString.
//
/// Returns:
///  A new autoreleased NSData with the decoded payload. nil for any error.
//
+(NSData *)decodeString:(NSString *)string;

//
// Modified Base64 encoding so the results can go onto urls.
//
// The changes are in the characters generated and also allows the result to
// not be padded to a multiple of 4.
// Must use the matching call to encode/decode, won't interop with the
// RFC versions.
//

// webSafeEncodeData:padded:
//
/// WebSafe Base64 encodes contents of the NSData object. If |padded| is YES
/// then padding characters are added so the result length is a multiple of 4.
//
/// Returns:
///  A new autoreleased NSData with the encoded payload. nil for any error.
//
+(NSData *)webSafeEncodeData:(NSData *)data
           padded:(BOOL)padded;

// webSafeDecodeData:
//
/// WebSafe Base64 decodes contents of the NSData object.
//
/// Returns:
///  A new autoreleased NSData with the decoded payload. nil for any error.
//
+(NSData *)webSafeDecodeData:(NSData *)data;

// webSafeEncodeBytes:length:padded:
//
/// WebSafe Base64 encodes the data pointed at by |bytes|. If |padded| is YES
/// then padding characters are added so the result length is a multiple of 4.
//
/// Returns:
///  A new autoreleased NSData with the encoded payload. nil for any error.
//
+(NSData *)webSafeEncodeBytes:(const void *)bytes
            length:(NSUInteger)length
            padded:(BOOL)padded;

// webSafeDecodeBytes:length:
//
/// WebSafe Base64 decodes the data pointed at by |bytes|.
//
/// Returns:
///  A new autoreleased NSData with the encoded payload. nil for any error.
//
+(NSData *)webSafeDecodeBytes:(const void *)bytes length:(NSUInteger)length;

// stringByWebSafeEncodingData:padded:
//
/// WebSafe Base64 encodes contents of the NSData object. If |padded| is YES
/// then padding characters are added so the result length is a multiple of 4.
//
/// Returns:
///  A new autoreleased NSString with the encoded payload. nil for any error.
//
+(NSString *)stringByWebSafeEncodingData:(NSData *)data
                 padded:(BOOL)padded;

// stringByWebSafeEncodingBytes:length:padded:
//
/// WebSafe Base64 encodes the data pointed at by |bytes|. If |padded| is YES
/// then padding characters are added so the result length is a multiple of 4.
//
/// Returns:
///  A new autoreleased NSString with the encoded payload. nil for any error.
//
+(NSString *)stringByWebSafeEncodingBytes:(const void *)bytes
                  length:(NSUInteger)length
                  padded:(BOOL)padded;

// webSafeDecodeString:
//
/// WebSafe Base64 decodes contents of the NSString.
//
/// Returns:
///  A new autoreleased NSData with the decoded payload. nil for any error.
//
+(NSData *)webSafeDecodeString:(NSString *)string;

// David Lee new added function
/// Returns:
// A new autoreleased NSString with Base64 encoded NSString
+(NSString *)stringByBase64String:(NSString *)base64String;

// David Lee new added function
/// Returns:
// A new autoreleased Base64 encoded NSString with NSString
+(NSString *)base64StringBystring:(NSString *)string;
@end


//
// GTMBase64.m
//
// Copyright 2006-2008 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy
// of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
// David Lee make changes:
// Remove dependency on GTMDefines.h
// add some string to string function

#import "GTMBase64.h"

static const char *kBase64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
static const char *kWebSafeBase64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
static const char kBase64PaddingChar = '=';
static const char kBase64InvalidChar = 99;

static const char kBase64DecodeChars[] = {
  // This array was generated by the following code:
  // #include <sys/time.h>
  // #include <stdlib.h>
  // #include <string.h>
  // main()
  // {
  //  static const char Base64[] =
  //   "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  //  char *pos;
  //  int idx, i, j;
  //  printf("  ");
  //  for (i = 0; i < 255; i += 8) {
  //   for (j = i; j < i + 8; j++) {
  //    pos = strchr(Base64, j);
  //    if ((pos == NULL) || (j == 0))
  //     idx = 99;
  //    else
  //     idx = pos - Base64;
  //    if (idx == 99)
  //     printf(" %2d,   ", idx);
  //    else
  //     printf(" %2d/*%c*/,", idx, j);
  //   }
  //   printf("\n  ");
  //  }
  // }
  99,   99,   99,   99,   99,   99,   99,   99,
  99,   99,   99,   99,   99,   99,   99,   99,
  99,   99,   99,   99,   99,   99,   99,   99,
  99,   99,   99,   99,   99,   99,   99,   99,
  99,   99,   99,   99,   99,   99,   99,   99,
  99,   99,   99,   62/*+*/, 99,   99,   99,   63/*/ */,
  52/*0*/, 53/*1*/, 54/*2*/, 55/*3*/, 56/*4*/, 57/*5*/, 58/*6*/, 59/*7*/,
  60/*8*/, 61/*9*/, 99,   99,   99,   99,   99,   99,
  99,    0/*A*/, 1/*B*/, 2/*C*/, 3/*D*/, 4/*E*/, 5/*F*/, 6/*G*/,
  7/*H*/, 8/*I*/, 9/*J*/, 10/*K*/, 11/*L*/, 12/*M*/, 13/*N*/, 14/*O*/,
  15/*P*/, 16/*Q*/, 17/*R*/, 18/*S*/, 19/*T*/, 20/*U*/, 21/*V*/, 22/*W*/,
  23/*X*/, 24/*Y*/, 25/*Z*/, 99,   99,   99,   99,   99,
  99,   26/*a*/, 27/*b*/, 28/*c*/, 29/*d*/, 30/*e*/, 31/*f*/, 32/*g*/,
  33/*h*/, 34/*i*/, 35/*j*/, 36/*k*/, 37/*l*/, 38/*m*/, 39/*n*/, 40/*o*/,
  41/*p*/, 42/*q*/, 43/*r*/, 44/*s*/, 45/*t*/, 46/*u*/, 47/*v*/, 48/*w*/,
  49/*x*/, 50/*y*/, 51/*z*/, 99,   99,   99,   99,   99,
  99,   99,   99,   99,   99,   99,   99,   99,
  99,   99,   99,   99,   99,   99,   99,   99,
  99,   99,   99,   99,   99,   99,   99,   99,
  99,   99,   99,   99,   99,   99,   99,   99,
  99,   99,   99,   99,   99,   99,   99,   99,
  99,   99,   99,   99,   99,   99,   99,   99,
  99,   99,   99,   99,   99,   99,   99,   99,
  99,   99,   99,   99,   99,   99,   99,   99,
  99,   99,   99,   99,   99,   99,   99,   99,
  99,   99,   99,   99,   99,   99,   99,   99,
  99,   99,   99,   99,   99,   99,   99,   99,
  99,   99,   99,   99,   99,   99,   99,   99,
  99,   99,   99,   99,   99,   99,   99,   99,
  99,   99,   99,   99,   99,   99,   99,   99,
  99,   99,   99,   99,   99,   99,   99,   99,
  99,   99,   99,   99,   99,   99,   99,   99
};

static const char kWebSafeBase64DecodeChars[] = {
  // This array was generated by the following code:
  // #include <sys/time.h>
  // #include <stdlib.h>
  // #include <string.h>
  // main()
  // {
  //  static const char Base64[] =
  //   "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
  //  char *pos;
  //  int idx, i, j;
  //  printf("  ");
  //  for (i = 0; i < 255; i += 8) {
  //   for (j = i; j < i + 8; j++) {
  //    pos = strchr(Base64, j);
  //    if ((pos == NULL) || (j == 0))
  //     idx = 99;
  //    else
  //     idx = pos - Base64;
  //    if (idx == 99)
  //     printf(" %2d,   ", idx);
  //    else
  //     printf(" %2d/*%c*/,", idx, j);
  //   }
  //   printf("\n  ");
  //  }
  // }
  99,   99,   99,   99,   99,   99,   99,   99,
  99,   99,   99,   99,   99,   99,   99,   99,
  99,   99,   99,   99,   99,   99,   99,   99,
  99,   99,   99,   99,   99,   99,   99,   99,
  99,   99,   99,   99,   99,   99,   99,   99,
  99,   99,   99,   99,   99,   62/*-*/, 99,   99,
  52/*0*/, 53/*1*/, 54/*2*/, 55/*3*/, 56/*4*/, 57/*5*/, 58/*6*/, 59/*7*/,
  60/*8*/, 61/*9*/, 99,   99,   99,   99,   99,   99,
  99,    0/*A*/, 1/*B*/, 2/*C*/, 3/*D*/, 4/*E*/, 5/*F*/, 6/*G*/,
  7/*H*/, 8/*I*/, 9/*J*/, 10/*K*/, 11/*L*/, 12/*M*/, 13/*N*/, 14/*O*/,
  15/*P*/, 16/*Q*/, 17/*R*/, 18/*S*/, 19/*T*/, 20/*U*/, 21/*V*/, 22/*W*/,
  23/*X*/, 24/*Y*/, 25/*Z*/, 99,   99,   99,   99,   63/*_*/,
  99,   26/*a*/, 27/*b*/, 28/*c*/, 29/*d*/, 30/*e*/, 31/*f*/, 32/*g*/,
  33/*h*/, 34/*i*/, 35/*j*/, 36/*k*/, 37/*l*/, 38/*m*/, 39/*n*/, 40/*o*/,
  41/*p*/, 42/*q*/, 43/*r*/, 44/*s*/, 45/*t*/, 46/*u*/, 47/*v*/, 48/*w*/,
  49/*x*/, 50/*y*/, 51/*z*/, 99,   99,   99,   99,   99,
  99,   99,   99,   99,   99,   99,   99,   99,
  99,   99,   99,   99,   99,   99,   99,   99,
  99,   99,   99,   99,   99,   99,   99,   99,
  99,   99,   99,   99,   99,   99,   99,   99,
  99,   99,   99,   99,   99,   99,   99,   99,
  99,   99,   99,   99,   99,   99,   99,   99,
  99,   99,   99,   99,   99,   99,   99,   99,
  99,   99,   99,   99,   99,   99,   99,   99,
  99,   99,   99,   99,   99,   99,   99,   99,
  99,   99,   99,   99,   99,   99,   99,   99,
  99,   99,   99,   99,   99,   99,   99,   99,
  99,   99,   99,   99,   99,   99,   99,   99,
  99,   99,   99,   99,   99,   99,   99,   99,
  99,   99,   99,   99,   99,   99,   99,   99,
  99,   99,   99,   99,   99,   99,   99,   99,
  99,   99,   99,   99,   99,   99,   99,   99
};


// Tests a character to see if it's a whitespace character.
//
// Returns:
//  YES if the character is a whitespace character.
//  NO if the character is not a whitespace character.
//
BOOL IsSpace(unsigned char c) {
  // we use our own mapping here because we don't want anything w/ locale
  // support.
  static BOOL kSpaces[256] = {
    0, 0, 0, 0, 0, 0, 0, 0, 0, 1, // 0-9
    1, 1, 1, 1, 0, 0, 0, 0, 0, 0, // 10-19
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 20-29
    0, 0, 1, 0, 0, 0, 0, 0, 0, 0, // 30-39
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 40-49
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 50-59
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 60-69
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 70-79
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 80-89
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 90-99
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 100-109
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 110-119
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 120-129
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 130-139
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 140-149
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 150-159
    1, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 160-169
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 170-179
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 180-189
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 190-199
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 200-209
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 210-219
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 220-229
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 230-239
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 240-249
    0, 0, 0, 0, 0, 1,       // 250-255
  };
  return kSpaces[c];
}

// Calculate how long the data will be once it's base64 encoded.
//
// Returns:
//  The guessed encoded length for a source length
//
NSUInteger CalcEncodedLength(NSUInteger srcLen, BOOL padded) {
  NSUInteger intermediate_result = 8 * srcLen + 5;
  NSUInteger len = intermediate_result / 6;
  if (padded) {
    len = ((len + 3) / 4) * 4;
  }
  return len;
}

// Tries to calculate how long the data will be once it's base64 decoded.
// Unlike the above, this is always an upperbound, since the source data
// could have spaces and might end with the padding characters on them.
//
// Returns:
//  The guessed decoded length for a source length
//
NSUInteger GuessDecodedLength(NSUInteger srcLen) {
  return (srcLen + 3) / 4 * 3;
}


@interface GTMBase64 (PrivateMethods)

+(NSData *)baseEncode:(const void *)bytes
        length:(NSUInteger)length
       charset:(const char *)charset
        padded:(BOOL)padded;

+(NSData *)baseDecode:(const void *)bytes
        length:(NSUInteger)length
       charset:(const char*)charset
    requirePadding:(BOOL)requirePadding;

+(NSUInteger)baseEncode:(const char *)srcBytes
         srcLen:(NSUInteger)srcLen
       destBytes:(char *)destBytes
        destLen:(NSUInteger)destLen
        charset:(const char *)charset
         padded:(BOOL)padded;

+(NSUInteger)baseDecode:(const char *)srcBytes
         srcLen:(NSUInteger)srcLen
       destBytes:(char *)destBytes
        destLen:(NSUInteger)destLen
        charset:(const char *)charset
     requirePadding:(BOOL)requirePadding;

@end


@implementation GTMBase64

//
// Standard Base64 (RFC) handling
//

+(NSData *)encodeData:(NSData *)data {
  return [self baseEncode:[data bytes]
           length:[data length]
          charset:kBase64EncodeChars
           padded:YES];
}

+(NSData *)decodeData:(NSData *)data {
  return [self baseDecode:[data bytes]
           length:[data length]
          charset:kBase64DecodeChars
       requirePadding:YES];
}

+(NSData *)encodeBytes:(const void *)bytes length:(NSUInteger)length {
  return [self baseEncode:bytes
           length:length
          charset:kBase64EncodeChars
           padded:YES];
}

+(NSData *)decodeBytes:(const void *)bytes length:(NSUInteger)length {
  return [self baseDecode:bytes
           length:length
          charset:kBase64DecodeChars
       requirePadding:YES];
}

+(NSString *)stringByEncodingData:(NSData *)data {
  NSString *result = nil;
  NSData *converted = [self baseEncode:[data bytes]
                 length:[data length]
                 charset:kBase64EncodeChars
                 padded:YES];
  if (converted) {
    result = [[[NSString alloc] initWithData:converted
                    encoding:NSASCIIStringEncoding] autorelease];
  }
  return result;
}

+(NSString *)stringByEncodingBytes:(const void *)bytes length:(NSUInteger)length {
  NSString *result = nil;
  NSData *converted = [self baseEncode:bytes
                 length:length
                 charset:kBase64EncodeChars
                 padded:YES];
  if (converted) {
    result = [[[NSString alloc] initWithData:converted
                    encoding:NSASCIIStringEncoding] autorelease];
  }
  return result;
}

+(NSData *)decodeString:(NSString *)string {
  NSData *result = nil;
  NSData *data = [string dataUsingEncoding:NSASCIIStringEncoding];
  if (data) {
    result = [self baseDecode:[data bytes]
              length:[data length]
             charset:kBase64DecodeChars
          requirePadding:YES];
  }
  return result;
}

//
// Modified Base64 encoding so the results can go onto urls.
//
// The changes are in the characters generated and also the result isn't
// padded to a multiple of 4.
// Must use the matching call to encode/decode, won't interop with the
// RFC versions.
//

+(NSData *)webSafeEncodeData:(NSData *)data
           padded:(BOOL)padded {
  return [self baseEncode:[data bytes]
           length:[data length]
          charset:kWebSafeBase64EncodeChars
           padded:padded];
}

+(NSData *)webSafeDecodeData:(NSData *)data {
  return [self baseDecode:[data bytes]
           length:[data length]
          charset:kWebSafeBase64DecodeChars
       requirePadding:NO];
}

+(NSData *)webSafeEncodeBytes:(const void *)bytes
            length:(NSUInteger)length
            padded:(BOOL)padded {
  return [self baseEncode:bytes
           length:length
          charset:kWebSafeBase64EncodeChars
           padded:padded];
}

+(NSData *)webSafeDecodeBytes:(const void *)bytes length:(NSUInteger)length {
  return [self baseDecode:bytes
           length:length
          charset:kWebSafeBase64DecodeChars
       requirePadding:NO];
}

+(NSString *)stringByWebSafeEncodingData:(NSData *)data
                 padded:(BOOL)padded {
  NSString *result = nil;
  NSData *converted = [self baseEncode:[data bytes]
                 length:[data length]
                 charset:kWebSafeBase64EncodeChars
                 padded:padded];
  if (converted) {
    result = [[[NSString alloc] initWithData:converted
                    encoding:NSASCIIStringEncoding] autorelease];
  }
  return result;
}

+(NSString *)stringByWebSafeEncodingBytes:(const void *)bytes
                  length:(NSUInteger)length
                  padded:(BOOL)padded {
  NSString *result = nil;
  NSData *converted = [self baseEncode:bytes
                 length:length
                 charset:kWebSafeBase64EncodeChars
                 padded:padded];
  if (converted) {
    result = [[[NSString alloc] initWithData:converted
                    encoding:NSASCIIStringEncoding] autorelease];
  }
  return result;
}

+(NSData *)webSafeDecodeString:(NSString *)string {
  NSData *result = nil;
  NSData *data = [string dataUsingEncoding:NSASCIIStringEncoding];
  if (data) {
    result = [self baseDecode:[data bytes]
              length:[data length]
             charset:kWebSafeBase64DecodeChars
          requirePadding:NO];
  }
  return result;
}

// David Lee new added function
/// Returns:
// A new autoreleased NSString with Base64 encoded NSString
+(NSString *)stringByBase64String:(NSString *)base64String
{
  NSString *sourceString = [[[NSString alloc] initWithData:[GTMBase64 decodeData:[base64String dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:NO]] encoding:NSUTF8StringEncoding] autorelease];
  return sourceString;
}

// David Lee new added function
/// Returns:
// A new autoreleased Base64 encoded NSString with NSString
+(NSString *)base64StringBystring:(NSString *)string
{
  NSString *base64String = [[[NSString alloc] initWithData:[GTMBase64 encodeData:[string dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:NO]] encoding:NSUTF8StringEncoding] autorelease];
  return base64String;
}

@end

@implementation GTMBase64 (PrivateMethods)

//
// baseEncode:length:charset:padded:
//
// Does the common lifting of creating the dest NSData. it creates & sizes the
// data for the results. |charset| is the characters to use for the encoding
// of the data. |padding| controls if the encoded data should be padded to a
// multiple of 4.
//
// Returns:
//  an autorelease NSData with the encoded data, nil if any error.
//
+(NSData *)baseEncode:(const void *)bytes
        length:(NSUInteger)length
       charset:(const char *)charset
        padded:(BOOL)padded {
  // how big could it be"how did we calc the length wrong");
  } else {
    // shouldn't happen, this means we ran out of space
    result = nil;
  }
  return result;
}

//
// baseDecode:length:charset:requirePadding:
//
// Does the common lifting of creating the dest NSData. it creates & sizes the
// data for the results. |charset| is the characters to use for the decoding
// of the data.
//
// Returns:
//  an autorelease NSData with the decoded data, nil if any error.
//
//
+(NSData *)baseDecode:(const void *)bytes
        length:(NSUInteger)length
       charset:(const char *)charset
    requirePadding:(BOOL)requirePadding {
  // could try to calculate what it will end up as
  NSUInteger maxLength = GuessDecodedLength(length);
  // make space
  NSMutableData *result = [NSMutableData data];
  [result setLength:maxLength];
  // do it
  NSUInteger finalLength = [self baseDecode:bytes
                    srcLen:length
                  destBytes:[result mutableBytes]
                   destLen:[result length]
                   charset:charset
                requirePadding:requirePadding];
  if (finalLength) {
    if (finalLength != maxLength) {
      // resize down to how big it was
      [result setLength:finalLength];
    }
  } else {
    // either an error in the args, or we ran out of space
    result = nil;
  }
  return result;
}

//
// baseEncode:srcLen:destBytes:destLen:charset:padded:
//
// Encodes the buffer into the larger. returns the length of the encoded
// data, or zero for an error.
// |charset| is the characters to use for the encoding
// |padded| tells if the result should be padded to a multiple of 4.
//
// Returns:
//  the length of the encoded data. zero if any error.
//
+(NSUInteger)baseEncode:(const char *)srcBytes
         srcLen:(NSUInteger)srcLen
       destBytes:(char *)destBytes
        destLen:(NSUInteger)destLen
        charset:(const char *)charset
         padded:(BOOL)padded {
  if (!srcLen || !destLen || !srcBytes || !destBytes) {
    return 0;
  }
  
  char *curDest = destBytes;
  const unsigned char *curSrc = (const unsigned char *)(srcBytes);
  
  // Three bytes of data encodes to four characters of cyphertext.
  // So we can pump through three-byte chunks atomically.
  while (srcLen > 2) {
    // space"our calc for encoded length was wrong");
    curDest[0] = charset[curSrc[0]  2];
    curDest[1] = charset[((curSrc[0] & 0x03) << 4) + (curSrc[1]  4)];
    curDest[2] = charset[((curSrc[1] & 0x0f) << 2) + (curSrc[2]  6)];
    curDest[3] = charset[curSrc[2] & 0x3f];
    
    curDest += 4;
    curSrc += 3;
    srcLen -= 3;
    destLen -= 4;
  }
  
  // now deal with the tail (<=2 bytes)
  switch (srcLen) {
    case 0:
      // Nothing left; nothing more to do.
      break;
    case 1:
      // One byte left: this encodes to two characters, and (optionally)
      // two pad characters to round out the four-character cypherblock.
      NSAssert(destLen >= 2, @"our calc for encoded length was wrong");
      curDest[0] = charset[curSrc[0]  2];
      curDest[1] = charset[(curSrc[0] & 0x03) << 4];
      curDest += 2;
      destLen -= 2;
      if (padded) {
        NSAssert(destLen >= 2, @"our calc for encoded length was wrong");
        curDest[0] = kBase64PaddingChar;
        curDest[1] = kBase64PaddingChar;
        curDest += 2;
      }
      break;
    case 2:
      // Two bytes left: this encodes to three characters, and (optionally)
      // one pad character to round out the four-character cypherblock.
      NSAssert(destLen >= 3, @"our calc for encoded length was wrong");
      curDest[0] = charset[curSrc[0]  2];
      curDest[1] = charset[((curSrc[0] & 0x03) << 4) + (curSrc[1]  4)];
      curDest[2] = charset[(curSrc[1] & 0x0f) << 2];
      curDest += 3;
      destLen -= 3;
      if (padded) {
        NSAssert(destLen >= 1, @"our calc for encoded length was wrong");
        curDest[0] = kBase64PaddingChar;
        curDest += 1;
      }
      break;
  }
  // return the length
  return (curDest - destBytes);
}

//
// baseDecode:srcLen:destBytes:destLen:charset:requirePadding:
//
// Decodes the buffer into the larger. returns the length of the decoded
// data, or zero for an error.
// |charset| is the character decoding buffer to use
//
// Returns:
//  the length of the encoded data. zero if any error.
//
+(NSUInteger)baseDecode:(const char *)srcBytes
         srcLen:(NSUInteger)srcLen
       destBytes:(char *)destBytes
        destLen:(NSUInteger)destLen
        charset:(const char *)charset
     requirePadding:(BOOL)requirePadding {
  if (!srcLen || !destLen || !srcBytes || !destBytes) {
    return 0;
  }
  
  int decode;
  NSUInteger destIndex = 0;
  int state = 0;
  char ch = 0;
  while (srcLen-- && (ch = *srcBytes++) != 0) {
    if (IsSpace(ch)) // Skip whitespace
      continue;
    
    if (ch == kBase64PaddingChar)
      break;
    
    decode = charset[(unsigned int)ch];
    if (decode == kBase64InvalidChar)
      return 0;
    
    // Four cyphertext characters decode to three bytes.
    // Therefore we can be in one of four states.
    switch (state) {
      case 0:
        // We're at the beginning of a four-character cyphertext block.
        // This sets the high six bits of the first byte of the
        // plaintext block.
        NSAssert(destIndex < destLen, @"our calc for decoded length was wrong");
        destBytes[destIndex] = decode << 2;
        state = 1;
        break;
      case 1:
        // We're one character into a four-character cyphertext block.
        // This sets the low two bits of the first plaintext byte,
        // and the high four bits of the second plaintext byte.
        NSAssert((destIndex+1) < destLen, @"our calc for decoded length was wrong");
        destBytes[destIndex] |= decode  4;
        destBytes[destIndex+1] = (decode & 0x0f) << 4;
        destIndex++;
        state = 2;
        break;
      case 2:
        // We're two characters into a four-character cyphertext block.
        // This sets the low four bits of the second plaintext
        // byte, and the high two bits of the third plaintext byte.
        // However, if this is the end of data, and those two
        // bits are zero, it could be that those two bits are
        // leftovers from the encoding of data that had a length
        // of two mod three.
        NSAssert((destIndex+1) < destLen, @"our calc for decoded length was wrong");
        destBytes[destIndex] |= decode  2;
        destBytes[destIndex+1] = (decode & 0x03) << 6;
        destIndex++;
        state = 3;
        break;
      case 3:
        // We're at the last character of a four-character cyphertext block.
        // This sets the low six bits of the third plaintext byte.
        NSAssert(destIndex < destLen, @"our calc for decoded length was wrong");
        destBytes[destIndex] |= decode;
        destIndex++;
        state = 0;
        break;
    }
  }
  
  // We are done decoding Base-64 chars. Let's see if we ended
  //   on a byte boundary, and/or with erroneous trailing characters.
  if (ch == kBase64PaddingChar) {        // We got a pad char
    if ((state == 0) || (state == 1)) {
      return 0; // Invalid '=' in first or second position
    }
    if (srcLen == 0) {
      if (state == 2) { // We run out of input but we still need another '='
        return 0;
      }
      // Otherwise, we are in state 3 and only need this '='
    } else {
      if (state == 2) { // need another '='
        while ((ch = *srcBytes++) && (srcLen-- > 0)) {
          if (!IsSpace(ch))
            break;
        }
        if (ch != kBase64PaddingChar) {
          return 0;
        }
      }
      // state = 1 or 2, check if all remain padding is space
      while ((ch = *srcBytes++) && (srcLen-- > 0)) {
        if (!IsSpace(ch)) {
          return 0;
        }
      }
    }
  } else {
    // We ended by seeing the end of the string.
    
    if (requirePadding) {
      // If we require padding, then anything but state 0 is an error.
      if (state != 0) {
        return 0;
      }
    } else {
      // Make sure we have no partial bytes lying around. Note that we do not
      // require trailing '=', so states 2 and 3 are okay too.
      if (state == 1) {
        return 0;
      }
    }
  }
  
  // If then next piece of output was valid and got written to it means we got a
  // very carefully crafted input that appeared valid but contains some trailing
  // bits past the real length, so just toss the thing.
  if ((destIndex < destLen) &&
    (destBytes[destIndex] != 0)) {
    return 0;
  }
  
  return destIndex;
}

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