Android、iPhone和Java三个平台一致的加密方法
首先是JAVA端的加密工具类，它同样适用于Android端，无需任何修改，即可保证Java与Android端的加解密一致，并且中文不会乱码。
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package org.liuyq.des3; 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 * * @author liufeng * @date 2012-10-11 */public class Des3 { // 密钥 private final static String secretKey = "liuyunqiang@lx100$#365#$"; // 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); } } |
上面的加密工具类会使用到Base64这个类，该类的源代码如下：
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package org.liuyq.des3; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.OutputStream; /** * Base64编码工具类 * * @author liufeng * @date 2012-10-11 */public 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; } } } |
接下来是iPhone端的加密程序，当然是用Ojbective-C写的3DES加密程序，源代码如下：
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// // DES3Util.h // lx100-gz // // Created by 柳峰 on 12-10-10. // Copyright 2012 http://blog.csdn.net/lyq8479. All rights reserved. // #import <Foundation/Foundation.h> @interface DES3Util : NSObject { } // 加密方法 + (NSString*)encrypt:(NSString*)plainText; // 解密方法 + (NSString*)decrypt:(NSString*)encryptText; @end |
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// // DES3Util.m // lx100-gz // // Created by 柳峰 on 12-9-17. // Copyright 2012 http://blog.csdn.net/lyq8479. All rights reserved. // #import "DES3Util.h" #import <CommonCrypto/CommonCryptor.h> #import "GTMBase64.h" #define gkey @"liuyunqiang@lx100$#365#$" #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; }
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