php、java、android、ios通用的3des方法(推荐)

2024-03-13 01:01:05 47

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

php

<?php
classDES3{
	var$key="my.oschina.net/penngo?#@";
	var$iv="01234567";

	functionencrypt($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$data;
	}
	functiondecrypt($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;
	}
	functionpkcs5_pad($text,$blocksize){
		$pad=$blocksize-(strlen($text)%$blocksize);
		return$text.str_repeat(chr($pad),$pad);
	}
	functionpkcs5_unpad($text){
		$pad=ord($text{strlen($text)-1});
		if($pad>strlen($text)){
			returnfalse;
		}
		if(strspn($text,chr($pad),strlen($text)-$pad)!=$pad){
			returnfalse;
		}
		returnsubstr($text,0,-1*$pad);
	}
	functionPaddingPKCS7($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;
	}
}

$des=newDES3();
echo$ret=$des->encrypt("来自http://jb51.net的博客")."\n";
echo$des->decrypt($ret)."\n";

java(android)

importjava.io.ByteArrayOutputStream;
importjava.io.IOException;
importjava.io.OutputStream;
importjava.io.UnsupportedEncodingException;
importjava.security.Key;

importjavax.crypto.Cipher;
importjavax.crypto.SecretKeyFactory;
importjavax.crypto.spec.DESedeKeySpec;
importjavax.crypto.spec.IvParameterSpec;

/**
*3DES加密工具类
*/
publicclassDES3{
//密钥
privatefinalstaticStringsecretKey="my.oschina.net/penngo?#@";
//向量
privatefinalstaticStringiv="01234567";
//加解密统一使用的编码方式
privatefinalstaticStringencoding="utf-8";

/**
*3DES加密
*
*@paramplainText普通文本
*@return
*@throwsException
*/
publicstaticStringencode(StringplainText)throwsException{
Keydeskey=null;
DESedeKeySpecspec=newDESedeKeySpec(secretKey.getBytes());
SecretKeyFactorykeyfactory=SecretKeyFactory.getInstance("desede");
deskey=keyfactory.generateSecret(spec);

Ciphercipher=Cipher.getInstance("desede/CBC/PKCS5Padding");
IvParameterSpecips=newIvParameterSpec(iv.getBytes());
cipher.init(Cipher.ENCRYPT_MODE,deskey,ips);
byte[]encryptData=cipher.doFinal(plainText.getBytes(encoding));
returnBase64.encode(encryptData);
}

/**
*3DES解密
*
*@paramencryptText加密文本
*@return
*@throwsException
*/
publicstaticStringdecode(StringencryptText)throwsException{
Keydeskey=null;
DESedeKeySpecspec=newDESedeKeySpec(secretKey.getBytes());
SecretKeyFactorykeyfactory=SecretKeyFactory.getInstance("desede");
deskey=keyfactory.generateSecret(spec);
Ciphercipher=Cipher.getInstance("desede/CBC/PKCS5Padding");
IvParameterSpecips=newIvParameterSpec(iv.getBytes());
cipher.init(Cipher.DECRYPT_MODE,deskey,ips);

byte[]decryptData=cipher.doFinal(Base64.decode(encryptText));

returnnewString(decryptData,encoding);
}

	publicstaticStringpadding(Stringstr){
		byte[]oldByteArray;
		try{
			oldByteArray=str.getBytes("UTF8");
			intnumberToPad=8-oldByteArray.length%8;
			byte[]newByteArray=newbyte[oldByteArray.length+numberToPad];
			System.arraycopy(oldByteArray,0,newByteArray,0,
					oldByteArray.length);
			for(inti=oldByteArray.length;i<newByteArray.length;++i){
				newByteArray[i]=0;
			}
			returnnewString(newByteArray,"UTF8");
		}catch(UnsupportedEncodingExceptione){
			System.out.println("Crypter.paddingUnsupportedEncodingException");
		}
		returnnull;
	}
	
	/**
	*Base64编码工具类
	*
	*/
	publicstaticclassBase64{
	privatestaticfinalchar[]legalChars="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".toCharArray();
	
	publicstaticStringencode(byte[]data){
	intstart=0;
	intlen=data.length;
	StringBufferbuf=newStringBuffer(data.length*3/2);
	
	intend=len-3;
	inti=start;
	intn=0;
	
	while(i<=end){
	intd=((((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){
	intd=((((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("=");
	}elseif(i==start+len-1){
	intd=(((int)data[i])&0x0ff)<<16;
	
	buf.append(legalChars[(d>>18)&63]);
	buf.append(legalChars[(d>>12)&63]);
	buf.append("==");
	}
	
	returnbuf.toString();
	}
	
	privatestaticintdecode(charc){
	if(c>='A'&&c<='Z')
	return((int)c)-65;
	elseif(c>='a'&&c<='z')
	return((int)c)-97+26;
	elseif(c>='0'&&c<='9')
	return((int)c)-48+26+26;
	else
	switch(c){
	case'+':
	return62;
	case'/':
	return63;
	case'=':
	return0;
	default:
	thrownewRuntimeException("unexpectedcode:"+c);
	}
	}
	
	/**
	*DecodesthegivenBase64encodedStringtoanewbytearray.Thebytearrayholdingthedecodeddataisreturned.
	*/
	
	publicstaticbyte[]decode(Strings){
	
	ByteArrayOutputStreambos=newByteArrayOutputStream();
	try{
	decode(s,bos);
	}catch(IOExceptione){
	thrownewRuntimeException();
	}
	byte[]decodedBytes=bos.toByteArray();
	try{
	bos.close();
	bos=null;
	}catch(IOExceptionex){
	System.err.println("ErrorwhiledecodingBASE64:"+ex.toString());
	}
	returndecodedBytes;
	}
	
	privatestaticvoiddecode(Strings,OutputStreamos)throwsIOException{
	inti=0;
	
	intlen=s.length();
	
	while(true){
	while(i<len&&s.charAt(i)<='')
	i++;
	
	if(i==len)
	break;
	
	inttri=(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;
	}
	}
	}

publicstaticvoidmain(String[]args)throwsException{
	StringplainText="来自http://jb51.net的博客";
	StringencryptText=DES3.encode(plainText);
	System.out.println(encryptText);
	System.out.println(DES3.decode(encryptText));

	
}
}

Ojbective-C(ios)

//
//DES3Util.h
//
#import<Foundation/Foundation.h>
@interfaceDES3Util: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"
#definegkey@"my.oschina.net/penngo?#@"
#definegIv@"01234567"

@implementationDES3Util
//加密方法
+(NSString*)encrypt:(NSString*)plainText{
NSData*data=[plainTextdataUsingEncoding:NSUTF8StringEncoding];
size_tplainTextBufferSize=[datalength];
constvoid*vplainText=(constvoid*)[databytes];

CCCryptorStatusccStatus;
uint8_t*bufferPtr=NULL;
size_tbufferPtrSize=0;
size_tmovedBytes=0;

bufferPtrSize=(plainTextBufferSize+kCCBlockSize3DES)&~(kCCBlockSize3DES-1);
bufferPtr=malloc(bufferPtrSize*sizeof(uint8_t));
memset((void*)bufferPtr,0x0,bufferPtrSize);

constvoid*vkey=(constvoid*)[gkeyUTF8String];
constvoid*vinitVec=(constvoid*)[gIvUTF8String];

ccStatus=CCCrypt(kCCEncrypt,
kCCAlgorithm3DES,
kCCOptionPKCS7Padding,
vkey,
kCCKeySize3DES,
vinitVec,
vplainText,
plainTextBufferSize,
(void*)bufferPtr,
bufferPtrSize,
&movedBytes);

NSData*myData=[NSDatadataWithBytes:(constvoid*)bufferPtrlength:(NSUInteger)movedBytes];
NSString*result=[GTMBase64stringByEncodingData:myData];
returnresult;
}

//解密方法
+(NSString*)decrypt:(NSString*)encryptText{
NSData*encryptData=[GTMBase64decodeData:[encryptTextdataUsingEncoding:NSUTF8StringEncoding]];
size_tplainTextBufferSize=[encryptDatalength];
constvoid*vplainText=[encryptDatabytes];

CCCryptorStatusccStatus;
uint8_t*bufferPtr=NULL;
size_tbufferPtrSize=0;
size_tmovedBytes=0;
bufferPtrSize=(plainTextBufferSize+kCCBlockSize3DES)&~(kCCBlockSize3DES-1);
bufferPtr=malloc(bufferPtrSize*sizeof(uint8_t));
memset((void*)bufferPtr,0x0,bufferPtrSize);
constvoid*vkey=(constvoid*)[gkeyUTF8String];
constvoid*vinitVec=(constvoid*)[gIvUTF8String];

ccStatus=CCCrypt(kCCDecrypt,
kCCAlgorithm3DES,
kCCOptionPKCS7Padding,
vkey,
kCCKeySize3DES,
vinitVec,
vplainText,
plainTextBufferSize,
(void*)bufferPtr,
bufferPtrSize,
&movedBytes);

NSString*result=[[[NSStringalloc]initWithData:[NSDatadataWithBytes:(constvoid*)bufferPtr
length:(NSUInteger)movedBytes]encoding:NSUTF8StringEncoding]autorelease];
returnresult;
}

@end






//
//GTMBase64.h
//
//Copyright2006-2008GoogleInc.
//
//LicensedundertheApacheLicense,Version2.0(the"License");youmaynot
//usethisfileexceptincompliancewiththeLicense.Youmayobtainacopy
//oftheLicenseat
//
//http://www.apache.org/licenses/LICENSE-2.0
//
//Unlessrequiredbyapplicablelaworagreedtoinwriting,software
//distributedundertheLicenseisdistributedonan"ASIS"BASIS,WITHOUT
//WARRANTIESORCONDITIONSOFANYKIND,eitherexpressorimplied.Seethe
//Licenseforthespecificlanguagegoverningpermissionsandlimitationsunder
//theLicense.

//DavidLeemakechanges:
//RemovedependencyonGTMDefines.h
//addsomestringtostringfunction

#import<Foundation/Foundation.h>

//GTMBase64
//
///HelperforhandlingBase64andWebSafeBase64encodings
//
///ThewebSafemethodsusedifferentcharactersetandalsotheresultsaren't
///alwayspaddedtoamultipleof4characters.Thisisdonesotheresulting
///datacanbeusedinurlsandurlqueryargumentswithoutneedingany
///encoding.YoumustusethewebSafe*methodstogether,thedatadoesnot
///interopwiththeRFCmethods.
//
@interfaceGTMBase64:NSObject

//
//StandardBase64(RFC)handling
//

//encodeData:
//
///Base64encodescontentsoftheNSDataobject.
//
///Returns:
///AnewautoreleasedNSDatawiththeencodedpayload.nilforanyerror.
//
+(NSData*)encodeData:(NSData*)data;

//decodeData:
//
///Base64decodescontentsoftheNSDataobject.
//
///Returns:
///AnewautoreleasedNSDatawiththedecodedpayload.nilforanyerror.
//
+(NSData*)decodeData:(NSData*)data;

//encodeBytes:length:
//
///Base64encodesthedatapointedatby|bytes|.
//
///Returns:
///AnewautoreleasedNSDatawiththeencodedpayload.nilforanyerror.
//
+(NSData*)encodeBytes:(constvoid*)byteslength:(NSUInteger)length;

//decodeBytes:length:
//
///Base64decodesthedatapointedatby|bytes|.
//
///Returns:
///AnewautoreleasedNSDatawiththeencodedpayload.nilforanyerror.
//
+(NSData*)decodeBytes:(constvoid*)byteslength:(NSUInteger)length;

//stringByEncodingData:
//
///Base64encodescontentsoftheNSDataobject.
//
///Returns:
///AnewautoreleasedNSStringwiththeencodedpayload.nilforanyerror.
//
+(NSString*)stringByEncodingData:(NSData*)data;

//stringByEncodingBytes:length:
//
///Base64encodesthedatapointedatby|bytes|.
//
///Returns:
///AnewautoreleasedNSStringwiththeencodedpayload.nilforanyerror.
//
+(NSString*)stringByEncodingBytes:(constvoid*)byteslength:(NSUInteger)length;

//decodeString:
//
///Base64decodescontentsoftheNSString.
//
///Returns:
///AnewautoreleasedNSDatawiththedecodedpayload.nilforanyerror.
//
+(NSData*)decodeString:(NSString*)string;

//
//ModifiedBase64encodingsotheresultscangoontourls.
//
//Thechangesareinthecharactersgeneratedandalsoallowstheresultto
//notbepaddedtoamultipleof4.
//Mustusethematchingcalltoencode/decode,won'tinteropwiththe
//RFCversions.
//

//webSafeEncodeData:padded:
//
///WebSafeBase64encodescontentsoftheNSDataobject.If|padded|isYES
///thenpaddingcharactersareaddedsotheresultlengthisamultipleof4.
//
///Returns:
///AnewautoreleasedNSDatawiththeencodedpayload.nilforanyerror.
//
+(NSData*)webSafeEncodeData:(NSData*)data
padded:(BOOL)padded;

//webSafeDecodeData:
//
///WebSafeBase64decodescontentsoftheNSDataobject.
//
///Returns:
///AnewautoreleasedNSDatawiththedecodedpayload.nilforanyerror.
//
+(NSData*)webSafeDecodeData:(NSData*)data;

//webSafeEncodeBytes:length:padded:
//
///WebSafeBase64encodesthedatapointedatby|bytes|.If|padded|isYES
///thenpaddingcharactersareaddedsotheresultlengthisamultipleof4.
//
///Returns:
///AnewautoreleasedNSDatawiththeencodedpayload.nilforanyerror.
//
+(NSData*)webSafeEncodeBytes:(constvoid*)bytes
length:(NSUInteger)length
padded:(BOOL)padded;

//webSafeDecodeBytes:length:
//
///WebSafeBase64decodesthedatapointedatby|bytes|.
//
///Returns:
///AnewautoreleasedNSDatawiththeencodedpayload.nilforanyerror.
//
+(NSData*)webSafeDecodeBytes:(constvoid*)byteslength:(NSUInteger)length;

//stringByWebSafeEncodingData:padded:
//
///WebSafeBase64encodescontentsoftheNSDataobject.If|padded|isYES
///thenpaddingcharactersareaddedsotheresultlengthisamultipleof4.
//
///Returns:
///AnewautoreleasedNSStringwiththeencodedpayload.nilforanyerror.
//
+(NSString*)stringByWebSafeEncodingData:(NSData*)data
padded:(BOOL)padded;

//stringByWebSafeEncodingBytes:length:padded:
//
///WebSafeBase64encodesthedatapointedatby|bytes|.If|padded|isYES
///thenpaddingcharactersareaddedsotheresultlengthisamultipleof4.
//
///Returns:
///AnewautoreleasedNSStringwiththeencodedpayload.nilforanyerror.
//
+(NSString*)stringByWebSafeEncodingBytes:(constvoid*)bytes
length:(NSUInteger)length
padded:(BOOL)padded;

//webSafeDecodeString:
//
///WebSafeBase64decodescontentsoftheNSString.
//
///Returns:
///AnewautoreleasedNSDatawiththedecodedpayload.nilforanyerror.
//
+(NSData*)webSafeDecodeString:(NSString*)string;

//DavidLeenewaddedfunction
///Returns:
//AnewautoreleasedNSStringwithBase64encodedNSString
+(NSString*)stringByBase64String:(NSString*)base64String;

//DavidLeenewaddedfunction
///Returns:
//AnewautoreleasedBase64encodedNSStringwithNSString
+(NSString*)base64StringBystring:(NSString*)string;
@end


//
//GTMBase64.m
//
//Copyright2006-2008GoogleInc.
//
//LicensedundertheApacheLicense,Version2.0(the"License");youmaynot
//usethisfileexceptincompliancewiththeLicense.Youmayobtainacopy
//oftheLicenseat
//
//http://www.apache.org/licenses/LICENSE-2.0
//
//Unlessrequiredbyapplicablelaworagreedtoinwriting,software
//distributedundertheLicenseisdistributedonan"ASIS"BASIS,WITHOUT
//WARRANTIESORCONDITIONSOFANYKIND,eitherexpressorimplied.Seethe
//Licenseforthespecificlanguagegoverningpermissionsandlimitationsunder
//theLicense.
//DavidLeemakechanges:
//RemovedependencyonGTMDefines.h
//addsomestringtostringfunction

#import"GTMBase64.h"

staticconstchar*kBase64EncodeChars="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
staticconstchar*kWebSafeBase64EncodeChars="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
staticconstcharkBase64PaddingChar='=';
staticconstcharkBase64InvalidChar=99;

staticconstcharkBase64DecodeChars[]={
//Thisarraywasgeneratedbythefollowingcode:
//#include<sys/time.h>
//#include<stdlib.h>
//#include<string.h>
//main()
//{
//staticconstcharBase64[]=
//"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
//char*pos;
//intidx,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
};

staticconstcharkWebSafeBase64DecodeChars[]={
//Thisarraywasgeneratedbythefollowingcode:
//#include<sys/time.h>
//#include<stdlib.h>
//#include<string.h>
//main()
//{
//staticconstcharBase64[]=
//"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
//char*pos;
//intidx,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
};


//Testsacharactertoseeifit'sawhitespacecharacter.
//
//Returns:
//YESifthecharacterisawhitespacecharacter.
//NOifthecharacterisnotawhitespacecharacter.
//
BOOLIsSpace(unsignedcharc){
//weuseourownmappingherebecausewedon'twantanythingw/locale
//support.
staticBOOLkSpaces[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
};
returnkSpaces[c];
}

//Calculatehowlongthedatawillbeonceit'sbase64encoded.
//
//Returns:
//Theguessedencodedlengthforasourcelength
//
NSUIntegerCalcEncodedLength(NSUIntegersrcLen,BOOLpadded){
NSUIntegerintermediate_result=8*srcLen+5;
NSUIntegerlen=intermediate_result/6;
if(padded){
len=((len+3)/4)*4;
}
returnlen;
}

//Triestocalculatehowlongthedatawillbeonceit'sbase64decoded.
//Unliketheabove,thisisalwaysanupperbound,sincethesourcedata
//couldhavespacesandmightendwiththepaddingcharactersonthem.
//
//Returns:
//Theguesseddecodedlengthforasourcelength
//
NSUIntegerGuessDecodedLength(NSUIntegersrcLen){
return(srcLen+3)/4*3;
}


@interfaceGTMBase64(PrivateMethods)

+(NSData*)baseEncode:(constvoid*)bytes
length:(NSUInteger)length
charset:(constchar*)charset
padded:(BOOL)padded;

+(NSData*)baseDecode:(constvoid*)bytes
length:(NSUInteger)length
charset:(constchar*)charset
requirePadding:(BOOL)requirePadding;

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

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

@end


@implementationGTMBase64

//
//StandardBase64(RFC)handling
//

+(NSData*)encodeData:(NSData*)data{
return[selfbaseEncode:[databytes]
length:[datalength]
charset:kBase64EncodeChars
padded:YES];
}

+(NSData*)decodeData:(NSData*)data{
return[selfbaseDecode:[databytes]
length:[datalength]
charset:kBase64DecodeChars
requirePadding:YES];
}

+(NSData*)encodeBytes:(constvoid*)byteslength:(NSUInteger)length{
return[selfbaseEncode:bytes
length:length
charset:kBase64EncodeChars
padded:YES];
}

+(NSData*)decodeBytes:(constvoid*)byteslength:(NSUInteger)length{
return[selfbaseDecode:bytes
length:length
charset:kBase64DecodeChars
requirePadding:YES];
}

+(NSString*)stringByEncodingData:(NSData*)data{
NSString*result=nil;
NSData*converted=[selfbaseEncode:[databytes]
length:[datalength]
charset:kBase64EncodeChars
padded:YES];
if(converted){
result=[[[NSStringalloc]initWithData:converted
encoding:NSASCIIStringEncoding]autorelease];
}
returnresult;
}

+(NSString*)stringByEncodingBytes:(constvoid*)byteslength:(NSUInteger)length{
NSString*result=nil;
NSData*converted=[selfbaseEncode:bytes
length:length
charset:kBase64EncodeChars
padded:YES];
if(converted){
result=[[[NSStringalloc]initWithData:converted
encoding:NSASCIIStringEncoding]autorelease];
}
returnresult;
}

+(NSData*)decodeString:(NSString*)string{
NSData*result=nil;
NSData*data=[stringdataUsingEncoding:NSASCIIStringEncoding];
if(data){
result=[selfbaseDecode:[databytes]
length:[datalength]
charset:kBase64DecodeChars
requirePadding:YES];
}
returnresult;
}

//
//ModifiedBase64encodingsotheresultscangoontourls.
//
//Thechangesareinthecharactersgeneratedandalsotheresultisn't
//paddedtoamultipleof4.
//Mustusethematchingcalltoencode/decode,won'tinteropwiththe
//RFCversions.
//

+(NSData*)webSafeEncodeData:(NSData*)data
padded:(BOOL)padded{
return[selfbaseEncode:[databytes]
length:[datalength]
charset:kWebSafeBase64EncodeChars
padded:padded];
}

+(NSData*)webSafeDecodeData:(NSData*)data{
return[selfbaseDecode:[databytes]
length:[datalength]
charset:kWebSafeBase64DecodeChars
requirePadding:NO];
}

+(NSData*)webSafeEncodeBytes:(constvoid*)bytes
length:(NSUInteger)length
padded:(BOOL)padded{
return[selfbaseEncode:bytes
length:length
charset:kWebSafeBase64EncodeChars
padded:padded];
}

+(NSData*)webSafeDecodeBytes:(constvoid*)byteslength:(NSUInteger)length{
return[selfbaseDecode:bytes
length:length
charset:kWebSafeBase64DecodeChars
requirePadding:NO];
}

+(NSString*)stringByWebSafeEncodingData:(NSData*)data
padded:(BOOL)padded{
NSString*result=nil;
NSData*converted=[selfbaseEncode:[databytes]
length:[datalength]
charset:kWebSafeBase64EncodeChars
padded:padded];
if(converted){
result=[[[NSStringalloc]initWithData:converted
encoding:NSASCIIStringEncoding]autorelease];
}
returnresult;
}

+(NSString*)stringByWebSafeEncodingBytes:(constvoid*)bytes
length:(NSUInteger)length
padded:(BOOL)padded{
NSString*result=nil;
NSData*converted=[selfbaseEncode:bytes
length:length
charset:kWebSafeBase64EncodeChars
padded:padded];
if(converted){
result=[[[NSStringalloc]initWithData:converted
encoding:NSASCIIStringEncoding]autorelease];
}
returnresult;
}

+(NSData*)webSafeDecodeString:(NSString*)string{
NSData*result=nil;
NSData*data=[stringdataUsingEncoding:NSASCIIStringEncoding];
if(data){
result=[selfbaseDecode:[databytes]
length:[datalength]
charset:kWebSafeBase64DecodeChars
requirePadding:NO];
}
returnresult;
}

//DavidLeenewaddedfunction
///Returns:
//AnewautoreleasedNSStringwithBase64encodedNSString
+(NSString*)stringByBase64String:(NSString*)base64String
{
NSString*sourceString=[[[NSStringalloc]initWithData:[GTMBase64decodeData:[base64StringdataUsingEncoding:NSUTF8StringEncodingallowLossyConversion:NO]]encoding:NSUTF8StringEncoding]autorelease];
returnsourceString;
}

//DavidLeenewaddedfunction
///Returns:
//AnewautoreleasedBase64encodedNSStringwithNSString
+(NSString*)base64StringBystring:(NSString*)string
{
NSString*base64String=[[[NSStringalloc]initWithData:[GTMBase64encodeData:[stringdataUsingEncoding:NSUTF8StringEncodingallowLossyConversion:NO]]encoding:NSUTF8StringEncoding]autorelease];
returnbase64String;
}

@end

@implementationGTMBase64(PrivateMethods)

//
//baseEncode:length:charset:padded:
//
//DoesthecommonliftingofcreatingthedestNSData.itcreates&sizesthe
//datafortheresults.|charset|isthecharacterstousefortheencoding
//ofthedata.|padding|controlsiftheencodeddatashouldbepaddedtoa
//multipleof4.
//
//Returns:
//anautoreleaseNSDatawiththeencodeddata,nilifanyerror.
//
+(NSData*)baseEncode:(constvoid*)bytes
length:(NSUInteger)length
charset:(constchar*)charset
padded:(BOOL)padded{
//howbigcoulditbe?
NSUIntegermaxLength=CalcEncodedLength(length,padded);
//makespace
NSMutableData*result=[NSMutableDatadata];
[resultsetLength:maxLength];
//doit
NSUIntegerfinalLength=[selfbaseEncode:bytes
srcLen:length
destBytes:[resultmutableBytes]
destLen:[resultlength]
charset:charset
padded:padded];
if(finalLength){
NSAssert(finalLength==maxLength,@"howdidwecalcthelengthwrong?");
}else{
//shouldn'thappen,thismeansweranoutofspace
result=nil;
}
returnresult;
}

//
//baseDecode:length:charset:requirePadding:
//
//DoesthecommonliftingofcreatingthedestNSData.itcreates&sizesthe
//datafortheresults.|charset|isthecharacterstouseforthedecoding
//ofthedata.
//
//Returns:
//anautoreleaseNSDatawiththedecodeddata,nilifanyerror.
//
//
+(NSData*)baseDecode:(constvoid*)bytes
length:(NSUInteger)length
charset:(constchar*)charset
requirePadding:(BOOL)requirePadding{
//couldtrytocalculatewhatitwillendupas
NSUIntegermaxLength=GuessDecodedLength(length);
//makespace
NSMutableData*result=[NSMutableDatadata];
[resultsetLength:maxLength];
//doit
NSUIntegerfinalLength=[selfbaseDecode:bytes
srcLen:length
destBytes:[resultmutableBytes]
destLen:[resultlength]
charset:charset
requirePadding:requirePadding];
if(finalLength){
if(finalLength!=maxLength){
//resizedowntohowbigitwas
[resultsetLength:finalLength];
}
}else{
//eitheranerrorintheargs,orweranoutofspace
result=nil;
}
returnresult;
}

//
//baseEncode:srcLen:destBytes:destLen:charset:padded:
//
//Encodesthebufferintothelarger.returnsthelengthoftheencoded
//data,orzeroforanerror.
//|charset|isthecharacterstousefortheencoding
//|padded|tellsiftheresultshouldbepaddedtoamultipleof4.
//
//Returns:
//thelengthoftheencodeddata.zeroifanyerror.
//
+(NSUInteger)baseEncode:(constchar*)srcBytes
srcLen:(NSUInteger)srcLen
destBytes:(char*)destBytes
destLen:(NSUInteger)destLen
charset:(constchar*)charset
padded:(BOOL)padded{
if(!srcLen||!destLen||!srcBytes||!destBytes){
return0;
}

char*curDest=destBytes;
constunsignedchar*curSrc=(constunsignedchar*)(srcBytes);

//Threebytesofdataencodestofourcharactersofcyphertext.
//Sowecanpumpthroughthree-bytechunksatomically.
while(srcLen>2){
//space?
NSAssert(destLen>=4,@"ourcalcforencodedlengthwaswrong");
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;
}

//nowdealwiththetail(<=2bytes)
switch(srcLen){
case0:
//Nothingleft;nothingmoretodo.
break;
case1:
//Onebyteleft:thisencodestotwocharacters,and(optionally)
//twopadcharacterstoroundoutthefour-charactercypherblock.
NSAssert(destLen>=2,@"ourcalcforencodedlengthwaswrong");
curDest[0]=charset[curSrc[0]>>2];
curDest[1]=charset[(curSrc[0]&0x03)<<4];
curDest+=2;
destLen-=2;
if(padded){
NSAssert(destLen>=2,@"ourcalcforencodedlengthwaswrong");
curDest[0]=kBase64PaddingChar;
curDest[1]=kBase64PaddingChar;
curDest+=2;
}
break;
case2:
//Twobytesleft:thisencodestothreecharacters,and(optionally)
//onepadcharactertoroundoutthefour-charactercypherblock.
NSAssert(destLen>=3,@"ourcalcforencodedlengthwaswrong");
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,@"ourcalcforencodedlengthwaswrong");
curDest[0]=kBase64PaddingChar;
curDest+=1;
}
break;
}
//returnthelength
return(curDest-destBytes);
}

//
//baseDecode:srcLen:destBytes:destLen:charset:requirePadding:
//
//Decodesthebufferintothelarger.returnsthelengthofthedecoded
//data,orzeroforanerror.
//|charset|isthecharacterdecodingbuffertouse
//
//Returns:
//thelengthoftheencodeddata.zeroifanyerror.
//
+(NSUInteger)baseDecode:(constchar*)srcBytes
srcLen:(NSUInteger)srcLen
destBytes:(char*)destBytes
destLen:(NSUInteger)destLen
charset:(constchar*)charset
requirePadding:(BOOL)requirePadding{
if(!srcLen||!destLen||!srcBytes||!destBytes){
return0;
}

intdecode;
NSUIntegerdestIndex=0;
intstate=0;
charch=0;
while(srcLen--&&(ch=*srcBytes++)!=0){
if(IsSpace(ch))//Skipwhitespace
continue;

if(ch==kBase64PaddingChar)
break;

decode=charset[(unsignedint)ch];
if(decode==kBase64InvalidChar)
return0;

//Fourcyphertextcharactersdecodetothreebytes.
//Thereforewecanbeinoneoffourstates.
switch(state){
case0:
//We'reatthebeginningofafour-charactercyphertextblock.
//Thissetsthehighsixbitsofthefirstbyteofthe
//plaintextblock.
NSAssert(destIndex<destLen,@"ourcalcfordecodedlengthwaswrong");
destBytes[destIndex]=decode<<2;
state=1;
break;
case1:
//We'reonecharacterintoafour-charactercyphertextblock.
//Thissetsthelowtwobitsofthefirstplaintextbyte,
//andthehighfourbitsofthesecondplaintextbyte.
NSAssert((destIndex+1)<destLen,@"ourcalcfordecodedlengthwaswrong");
destBytes[destIndex]|=decode>>4;
destBytes[destIndex+1]=(decode&0x0f)<<4;
destIndex++;
state=2;
break;
case2:
//We'retwocharactersintoafour-charactercyphertextblock.
//Thissetsthelowfourbitsofthesecondplaintext
//byte,andthehightwobitsofthethirdplaintextbyte.
//However,ifthisistheendofdata,andthosetwo
//bitsarezero,itcouldbethatthosetwobitsare
//leftoversfromtheencodingofdatathathadalength
//oftwomodthree.
NSAssert((destIndex+1)<destLen,@"ourcalcfordecodedlengthwaswrong");
destBytes[destIndex]|=decode>>2;
destBytes[destIndex+1]=(decode&0x03)<<6;
destIndex++;
state=3;
break;
case3:
//We'reatthelastcharacterofafour-charactercyphertextblock.
//Thissetsthelowsixbitsofthethirdplaintextbyte.
NSAssert(destIndex<destLen,@"ourcalcfordecodedlengthwaswrong");
destBytes[destIndex]|=decode;
destIndex++;
state=0;
break;
}
}

//WearedonedecodingBase-64chars.Let'sseeifweended
//onabyteboundary,and/orwitherroneoustrailingcharacters.
if(ch==kBase64PaddingChar){//Wegotapadchar
if((state==0)||(state==1)){
return0;//Invalid'='infirstorsecondposition
}
if(srcLen==0){
if(state==2){//Werunoutofinputbutwestillneedanother'='
return0;
}
//Otherwise,weareinstate3andonlyneedthis'='
}else{
if(state==2){//needanother'='
while((ch=*srcBytes++)&&(srcLen-->0)){
if(!IsSpace(ch))
break;
}
if(ch!=kBase64PaddingChar){
return0;
}
}
//state=1or2,checkifallremainpaddingisspace
while((ch=*srcBytes++)&&(srcLen-->0)){
if(!IsSpace(ch)){
return0;
}
}
}
}else{
//Weendedbyseeingtheendofthestring.

if(requirePadding){
//Ifwerequirepadding,thenanythingbutstate0isanerror.
if(state!=0){
return0;
}
}else{
//Makesurewehavenopartialbyteslyingaround.Notethatwedonot
//requiretrailing'=',sostates2and3areokaytoo.
if(state==1){
return0;
}
}
}

//Ifthennextpieceofoutputwasvalidandgotwrittentoitmeanswegota
//verycarefullycraftedinputthatappearedvalidbutcontainssometrailing
//bitspastthereallength,sojusttossthething.
if((destIndex<destLen)&&
(destBytes[destIndex]!=0)){
return0;
}

returndestIndex;
}

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