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

PHP;">

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,MCRYPT_RAND);
    }
    else
    {
        $iv = $this->iv;
    }
    $ks = mcrypt_enc_get_key_size($td);
    @mcrypt_generic_init($td,$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,-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.cc的博客") . "\n";
echo $des->decrypt($ret) . "\n";

java(android)

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,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,newByteArray,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.cc的博客";
String encryptText = DES3.encode(plainText);
System.out.println(encryptText);
System.out.println(DES3.decode(encryptText));

}
}

Ojbective-C(ios)

PHP;"> // // DES3Util.h // #import @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,bufferPtrSize);
const void vkey = (const void ) [gkey UTF8String];
const void vinitVec = (const void *) [gIv UTF8String];

ccStatus = CCCrypt(kCCDecrypt,&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,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 ");
// }
// }
99,99,62/+/,63// /,52/0/,53/1/,54/2/,55/3/,56/4/,57/5/,58/6/,59/7/,60/8/,61/9/,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/,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
};

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,62/-/,63/*/,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] = {
0,1,// 0-9
1,// 10-19
0,// 20-29
0,// 30-39
0,// 40-49
0,// 50-59
0,// 60-69
0,// 70-79
0,// 80-89
0,// 90-99
0,// 100-109
0,// 110-119
0,// 120-129
0,// 130-139
0,// 140-149
0,// 150-159
1,// 160-169
0,// 170-179
0,// 180-189
0,// 190-199
0,// 200-209
0,// 210-219
0,// 220-229
0,// 230-239
0,// 240-249
0,// 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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原文链接：https://www.f2er.com/php/19070.html

php、java、android、ios通用的3des方法(推荐)

Ojbective-C(ios)

import "DES3Util.h"

import <CommonCrypto/CommonCryptor.h>

import "GTMBase64.h"

define gkey @"my.oschina.net/penngo?#@"

define gIv @"01234567"

import <Foundation/Foundation.h>

import "GTMBase64.h"

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