《PHP应用：php、java、android、ios通用的3des方法(推荐)》要点：
本文介绍了PHP应用：php、java、android、ios通用的3des方法(推荐)，希望对您有用。如果有疑问，可以联系我们。
PHP实战php服务器,java服务器,android,ios开发兼容的3des加密解密,
PHP实战php
PHP实战
<?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";
PHP实战 java(android)
PHP实战
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));
}
}
PHP实战 Ojbective-C(ios)
PHP实战
//
// 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 stringByEncoding 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] initWith 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
//
// encode won't interop with the
// RFC versions.
//
// webSafeEncode 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 *)encode won't interop with the
// RFC versions.
//
+(NSData *)webSafeEncode 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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