怎么实现php、java、android、ios通用的3des方法
发表于：2025-01-26 作者：千家信息网编辑
千家信息网最后更新 2025年01月26日，这篇文章给大家分享的是有关怎么实现php、java、android、ios通用的3des方法的内容。小编觉得挺实用的，因此分享给大家做个参考，一起跟随小编过来看看吧。php服务器，java服务器，an
千家信息网最后更新 2025年01月26日怎么实现php、java、android、ios通用的3des方法
这篇文章给大家分享的是有关怎么实现php、java、android、ios通用的3des方法的内容。小编觉得挺实用的，因此分享给大家做个参考，一起跟随小编过来看看吧。
php服务器，java服务器，android，ios开发兼容的3des加密解密，
php
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@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 #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 // 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 // #include // #include // 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 // #include // #include // 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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