php、java、android、ios通用的3des方法(推荐)

php服务器，java服务器，android，ios开发兼容的3des加密解密，php<?phpclassDES3{var$key="my.oschi

php服务器，java服务器，android，ios开发兼容的3des加密解密，

php

<?php
class DES3 {
	var $key = "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?
 NSUInteger maxLength = CalcEncodedLength(length, padded);
 // make space
 NSMutableData *result = [NSMutableData data];
 [result setLength:maxLength];
 // do it
 NSUInteger finalLength = [self baseEncode:bytes
 srcLen:length
 destBytes:[result mutableBytes]
 destLen:[result length]
 charset:charset
 padded:padded];
 if (finalLength) {
 NSAssert(finalLength == maxLength, @"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?
 NSAssert(destLen >= 4, @"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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