关于iOS的des加密解密（适合中文加密和长字符串加密解密）

/// 工程中只需把下面的2个方法拖进去，然后就可以调用,且需要导入头文件#import"GTMBase64.h"

#include<CommonCrypto/CommonCryptor.h>

///加密算法

staticByteiv[] = {0x12,0x34,0x56,0x78,0x90,0xAB,0xCD,0xEF};

-(NSString*) encryptUseDESS:(NSString*)plainText key:(NSString*)key

{

NSString*ciphertext =nil;

constchar*textBytes = [plainTextUTF8String];

NSUIntegerdataLength =strlen(textBytes);

unsignedcharbuffer[1024];

memset(buffer,0,sizeof(char));

size_tnumBytesEncrypted =0;

CCCryptorStatuscryptStatus =CCCrypt(kCCEncrypt,kCCAlgorithmDES,

kCCOptionPKCS7Padding,

[keyUTF8String],kCCKeySizeDES,

iv,

textBytes, dataLength,

buffer,1024,

&numBytesEncrypted);

if(cryptStatus ==kCCSuccess) {

NSData*data = [NSDatadataWithBytes:bufferlength:(NSUInteger)numBytesEncrypted];

ciphertext = [database64Encoding];

}

returnciphertext;

}

///解密

-(NSString*) decryptUseDES:(NSString*)cipherText key:(NSString*)key {

NSData* cipherData = [GTMBase64decodeString:cipherText];

///如果需要解密的字符串太长，可以把下面的buffer数字设大一点

unsigned char buffer[1024*100];

memset(buffer,0,sizeof(char));

size_tnumBytesDecrypted =0;

Byteiv[] = {0x12,0x34,0x56,0x78,0x90,0xAB,0xCD,0xEF};

CCCryptorStatuscryptStatus =CCCrypt(kCCDecrypt,

kCCAlgorithmDES,

kCCOptionPKCS7Padding,

[keyUTF8String],

kCCKeySizeDES,

iv,

[cipherDatabytes],

[cipherDatalength],

buffer,

1024*100,

&numBytesDecrypted);

NSString* plainText =nil;

if(cryptStatus ==kCCSuccess) {

NSData* data = [NSDatadataWithBytes:buffer length:(NSUInteger)numBytesDecrypted];

plainText = [[NSStringalloc]initWithData:data encoding:NSUTF8StringEncoding];

}

returnplainText;

}