//
//  PGGCryptoDES.m
//  PGGCrypto
//
//  Created by 陈鹏 on 2017/10/24.
//  Copyright © 2017年 penggege.CP. All rights reserved.
//  GitHub地址  https://github.com/penghero/PGGCrypto.git

#import "PGGCryptoDES.h"
#import "GTMBase64.h"
#import <CommonCrypto/CommonCrypto.h>
//#define PGGkey @"#probim*"
//#define PGGiv @"#probim*"
#define PGGkey @"abcabcabcabcabcabcabcabc"
#define PGGiv @"1234567890000000"

@implementation PGGCryptoDES


//    Des加密
+(NSString *) encryptUseDES:(NSString *)plainText {
    NSString *ciphertext = nil;
    NSData *textData = [plainText dataUsingEncoding:NSUTF8StringEncoding];
    NSUInteger dataLength = [textData length];
    unsigned char buffer[1024];
    memset(buffer, 0, sizeof(char));
    size_t numBytesEncrypted = 0;
    CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt,
                                          kCCAlgorithmDES,
                                          kCCOptionPKCS7Padding,
                                          [PGGkey UTF8String],
                                          kCCKeySizeDES,
                                          [PGGiv UTF8String],
                                          [textData bytes],
                                          dataLength,
                                          buffer,
                                          1024,
                                          &numBytesEncrypted);
    if (cryptStatus == kCCSuccess) {
        NSData *data = [NSData dataWithBytes:buffer length:(NSUInteger)numBytesEncrypted];
        ciphertext = [GTMBase64 stringByEncodingData:data];
    }
    return ciphertext;
}
//    Des解密
+(NSString *)decryptUseDES:(NSString *)cipherText {
    NSString *plaintext = nil;
    NSData *cipherdata = [GTMBase64 decodeString:cipherText];
    unsigned char buffer[1024];
    memset(buffer, 0, sizeof(char));
    size_t numBytesDecrypted = 0;
    CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt,
                                          kCCAlgorithmDES,
                                          kCCOptionPKCS7Padding,
                                          [PGGkey UTF8String],
                                          kCCKeySizeDES,
                                          [PGGiv UTF8String],
                                          [cipherdata bytes],
                                          [cipherdata length],
                                          buffer,
                                          1024,
                                          &numBytesDecrypted);
    if(cryptStatus == kCCSuccess){
        NSData *plaindata = [NSData dataWithBytes:buffer length:(NSUInteger)numBytesDecrypted];
        plaintext = [[NSString alloc]initWithData:plaindata encoding:NSUTF8StringEncoding];
    }
    return plaintext;
}

@end