ios des加密与解密（对应JAVA加解密）

来源：互联网发布：大宗商品进出口数据编辑：程序博客网时间：2024/04/29 12:18

文章转载自互联网：http://www.cnblogs.com/xiaobaizhu/p/3453055.html

以下代码有添加用到hexString的转换过程

////  NSString+DES.h//  TestDES////  Created by coooliang on 15/12/25.//  Copyright © 2015年 coooliang. All rights reserved.//#import <Foundation/Foundation.h>@interface NSString (DES)+(NSString *)des:(NSString *)str key:(NSString *)key;+(NSString *)decryptDes:(NSString*)str key:(NSString*)key;@end

////  NSString+DES.m//  TestDES////  Created by coooliang on 15/12/25.//  Copyright © 2015年 coooliang. All rights reserved.//#import "NSString+DES.h"#import "GTMBase64.h"#import <CommonCrypto/CommonCryptor.h>#import "NSData+DataToHexString.h"@implementation NSString (DES)+(NSString *)des:(NSString *)str key:(NSString *)key{    NSString *ciphertext = nil;        NSData *data = [str dataUsingEncoding:NSUTF8StringEncoding];        char keyPtr[kCCKeySizeAES256+1];    bzero(keyPtr, sizeof(keyPtr));    [key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];        NSUInteger dataLength = [data length];        size_t bufferSize = dataLength + kCCBlockSizeAES128;    void *buffer = malloc(bufferSize);        size_t numBytesEncrypted = 0;        CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt, kCCAlgorithmDES,                                              kCCOptionPKCS7Padding|kCCOptionECBMode,                                              keyPtr, kCCBlockSizeDES,                                              NULL,                                              [data bytes], dataLength,                                              buffer, bufferSize,                                              &numBytesEncrypted);                                                  if (cryptStatus == kCCSuccess) {        NSData *data = [NSData dataWithBytes:buffer length:(NSUInteger)numBytesEncrypted];        NSLog(@"data = %@",data);        ciphertext = [data dataToHexString];        NSLog(@"ciphertext = %@",ciphertext);    }    return ciphertext;}//解密+(NSString *)decryptDes:(NSString*)hexString key:(NSString*)key{    NSData *data = [self hexStringToData:hexString];        char keyPtr[kCCKeySizeAES256+1];    bzero(keyPtr, sizeof(keyPtr));    [key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];        NSUInteger dataLength = [data length];        size_t bufferSize = dataLength + kCCBlockSizeAES128;    void *buffer = malloc(bufferSize);        size_t numBytesEncrypted = 0;        CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt, kCCAlgorithmDES, kCCOptionPKCS7Padding|kCCOptionECBMode, keyPtr, kCCBlockSizeDES, NULL, [data bytes], dataLength, buffer, bufferSize, &numBytesEncrypted);    if(cryptStatus == kCCSuccess){        NSString *string = [[NSString alloc]initWithData:[NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted] encoding:NSUTF8StringEncoding];        NSLog(@"string = %@",string);        return string;    }    free(buffer);    return nil;}+(NSData *)hexStringToData:(NSString *)hexString{    const char *chars = [hexString UTF8String];    int i = 0;    int len = (int)hexString.length;    NSMutableData *data = [NSMutableData dataWithCapacity:len/2];    char byteChars[3] = {'\0','\0','\0'};    unsigned long wholeByte;        while (i<len) {        byteChars[0] = chars[i++];        byteChars[1] = chars[i++];        wholeByte = strtoul(byteChars, NULL, 16);        [data appendBytes:&wholeByte length:1];    }    return data;}@end

/** * DES加密，输入内容将被UTF-8编码后进行加密，密钥长度不要大于8位 *  * @param key 密钥 * @param content 明文 * @return 密文 */public static String encryptByDES(String key, String content) {if ((key == null) || (content == null))return null;// 生成密钥，密钥长度限定为8位，如果超出8位取前8位byte[] tmpBytes;try {tmpBytes = key.getBytes("UTF-8");} catch (UnsupportedEncodingException e) {log.error("不支持的字符集。", e);return null;}byte[] keyBytes = new byte[8];for (int i = 0; i < tmpBytes.length && i < keyBytes.length; i++) {keyBytes[i] = tmpBytes[i];}// DES加密成为密文try {Key k = new SecretKeySpec(keyBytes, "DES");Cipher cipher = Cipher.getInstance("DES");cipher.init(Cipher.ENCRYPT_MODE, k);byte[] output = cipher.doFinal(content.getBytes("UTF-8"));return ConvertUtil.bytesToHexString(output);} catch (Exception e) {log.error("DES加密失败。", e);}return null;}/** * DES解密，输入内容是密文，密钥长度不要大于8位 *  * @param key 密钥 * @param cipherText 密文 * @return 明文 */public static String decryptByDES(String key, String cipherText) {if ((key == null) || (cipherText == null))return null;// 生成密钥，密钥长度限定为8位，如果超出8位取前8位byte[] tmpBytes;try {tmpBytes = key.getBytes("UTF-8");} catch (UnsupportedEncodingException e) {log.error("不支持的字符集。", e);return null;}byte[] keyBytes = new byte[8];for (int i = 0; i < tmpBytes.length && i < keyBytes.length; i++) {keyBytes[i] = tmpBytes[i];}// DES解密成为明文try {Key k = new SecretKeySpec(keyBytes, "DES");Cipher cipher = Cipher.getInstance("DES");cipher.init(Cipher.DECRYPT_MODE, k);byte[] output = cipher.doFinal(ConvertUtil.hexStringToBytes(cipherText));return new String(output, "UTF-8");} catch (Exception e) {log.error("DES解密失败。", e);}return null;}

public class ConvertUtil {public static String bytesToHexString(byte[] src){StringBuilder stringBuilder = new StringBuilder("");          if (src == null || src.length <= 0) {              return null;          }          for (int i = 0; i < src.length; i++) {              int v = src[i] & 0xFF;              String hv = Integer.toHexString(v);              if (hv.length() < 2) {                  stringBuilder.append(0);              }              stringBuilder.append(hv);          }          return stringBuilder.toString();}public static byte[] hexStringToBytes(String hexString) {          if (hexString == null || hexString.equals("")) {              return null;          }          hexString = hexString.toUpperCase();          int length = hexString.length() / 2;          char[] hexChars = hexString.toCharArray();          byte[] d = new byte[length];          for (int i = 0; i < length; i++) {              int pos = i * 2;              d[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]));          }          return d;      }public static String stringToHexString(String str) {        return bytesToHexString(str.getBytes());    }public static String hexStringtoString(String hexString) {        return new String(hexStringToBytes(hexString));    }private static byte charToByte(char c) {          return (byte) "0123456789ABCDEF".indexOf(c);      }}

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