Java/IOS通用异或加解密字符串

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1、Java的异或加解密算法

在使用异或加解密时，加密和解密的密钥必须保持相同，否则解密时无法恢复为原来的内容。

public class XOREncryptAndDecrypt {//密钥 加解密的密钥必须相同 可自定义private static final String secretKey ="abcdefghijklmnopqrstuvwxyz"; /** * 字符串加密 * @param plainText 要加密的字符串 * @return 加密后的字符串 */public static String encrypt(String plainText){ String encryption = ""; try { plainText =  new String(plainText.getBytes("UTF-8"),"iso-8859-1");} catch (Exception e) {}     char[] cipher=new char[plainText.length()];     for(int i=0,j=0;i<plainText.length();i++,j++){         if(j==secretKey.length())             j=0;         cipher[i]=(char) (plainText.charAt(i)^secretKey.charAt(j));         String strCipher= Integer.toHexString(cipher[i]);         if(strCipher.length() == 1){         encryption+="0"+strCipher;         }else{         encryption+=strCipher;         }     }     return encryption; }/** * 解密字符串 * @param encryption 要解密的字符串 * @return 解密后的字符串 */public static String decrypt(String encryption) {     char[] decryption=new char[encryption.length()/2];     for(int i=0,j=0;i<encryption.length()/2;i++,j++){         if(j==secretKey.length())             j=0;         char n=(char)(int)Integer.valueOf(encryption.substring(i*2,i*2+2),16);         decryption[i]=(char)(n^secretKey.charAt(j));     }     String decoding="";     try {     decoding = new String(String.valueOf(decryption).getBytes("iso-8859-1"),"UTF-8"); } catch (Exception e) {}     return decoding; }/** * @param args */public static void main(String[] args) {String name="你好"; String tem=XOREncryptAndDecrypt.encrypt(name); System.out.println(tem); System.out.println(XOREncryptAndDecrypt.decrypt(tem));}}

2、IOS加解密算法

在使用异或加解密时，加密和解密的密钥必须保持相同，否则解密时无法恢复为原来的内容。如果想在IOS与Java中通用，必须保持Java与IOS中的密钥一致。

1）.h文件内容

#import <Foundation/Foundation.h>@interface XOREncryptAndDecrypt : NSObject/** *  字符串加密 * *  @param plainText 要加密的字符串 * *  @return 加密后的字符串 */+ (NSString *)encryptForPlainText:(NSString *)plainText;/** *  解密字符串 * *  @param encryption 要解密的字符串 * *  @return 要解密的字符串 如果不为加密字符则返回原字符串 */+ (NSString *)decryptForEncryption:(NSString *)encryption;@end

2）.m文件内容

#import "XOREncryptAndDecrypt.h"@implementation XOREncryptAndDecryptstatic NSString *secretKey =@"abcdefghijklmnopqrstuvwxyz"; ///<密钥 加解密的密钥必须相同 可自定义#pragma mark 加密字符串+ (NSString *)encryptForPlainText:(NSString *)plainText{    //保存加密后的字符    NSMutableString *encryption=[NSMutableString string];    //编码转换后的字符串 UTF_8->iso-8859-1    NSString *encoding=[[NSString alloc]initWithData:[plainText dataUsingEncoding:NSUTF8StringEncoding] encoding:NSISOLatin1StringEncoding];        for(int i=0,j=0;i<encoding.length;i++,j++){        if(j==secretKey.length){            j=0;        }        //异或后的字符        char cipher=(char)([encoding characterAtIndex:i]^[secretKey characterAtIndex:j]);        //NSLog(@"%c转成16进制的字符串：%@,%@",cipher,[NSString stringWithFormat:@"%hhx",cipher],[NSString stringWithFormat:@"%x",cipher&0xff]);        //转成16进制形式的字符串 \x8b转成8b字符串        NSString *strCipher= [NSString stringWithFormat:@"%hhx",cipher];        if(strCipher.length == 1){            [encryption appendFormat:@"0%@",strCipher];        }else{            [encryption appendString:strCipher];        }    }    return encryption;}#pragma mark 解密 如果不为加密字符则返回原字符+ (NSString *)decryptForEncryption:(NSString *)encryption {    //保存解密后的字符    NSMutableString *decryption=[NSMutableString string];    //解码字符    NSString *decoding=nil;        for(int i=0,j=0;i<encryption.length/2;i++,j++){        if(j==secretKey.length){            j=0;        }        //截取16进制形式的字符串 \x8b中的8b        NSString *tem=[encryption substringWithRange:NSMakeRange(i*2, 2)];        char *endptr;        //把16进制形式的字符串转为字符        char n=(char)(int)strtoul([tem UTF8String],&endptr,16);        //判断是否为加密字符        if (n=='\0'&&*endptr!='\0') {            [decryption setString:@""];            break;        }        [decryption appendFormat:@"%c",(char)(n^[secretKey characterAtIndex:j])];    }    if (![decryption isEqualToString:@""]) {        //编码后的字符串 iso-8859-1 -> UTF_8        decoding=[[NSString alloc]initWithData:[[decryption copy] dataUsingEncoding:NSISOLatin1StringEncoding] encoding:NSUTF8StringEncoding];    }    if (decoding==nil) {        decoding=encryption;    }    return decoding;}@end

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