最近公司需要对url明文加密，经过讨论后使用了3DES加密
1.首先需要导入GTMBase64开源框架库
2.KCCEncrypt是加密，KCCDecrypt是解密,kCCAlgorithm3DES是加密方式（还有des，aes），设置好加密密匙。封装好后是下面这个样子：
#import "NSString+ThreeDES.h"
#import
#import
#import "GTMBase64.h"
@implementation NSString (KDS_ThreeDES)
#pragma mark- 3des加密
+ (NSString*)getEncryptWithString:(NSString *)encryptString keyString:(NSString *)keyString ivString:(NSString *)ivString{
return [self encrypt:encryptString keyString:keyString ivString:ivString operation:kCCEncrypt];
}
#pragma mark- 3des解密
+ (NSString*)getDecryptWithString:(NSString *)decryptString keyString:(NSString *)keyString ivString:(NSString *)ivString{
return [self encrypt:decryptString keyString:keyString ivString:ivString operation:kCCDecrypt];
}
+(NSString *) encrypt:(NSString*)plainText keyString:(NSString*)keyString ivString:(NSString*)ivString operation:(CCOperation)encryptOrDecrypt
{
const void * vplainText;
size_t plainTextBufferSize;
if (encryptOrDecrypt== kCCDecrypt)
{
NSData * EncryptData = [GTMBase64 decodeData:[plainText
dataUsingEncoding:NSUTF8StringEncoding]];
plainTextBufferSize= [EncryptData length];
vplainText = [EncryptData bytes];
}
else
{
NSData * tempData = [plainText dataUsingEncoding:NSUTF8StringEncoding];
plainTextBufferSize= [tempData length];
vplainText = [tempData bytes];
}
CCCryptorStatus ccStatus;
uint8_t * bufferPtr = NULL;
size_t bufferPtrSize = 0;
size_t movedBytes = 0;
// uint8_t ivkCCBlockSize3DES;
bufferPtrSize = (plainTextBufferSize + kCCBlockSize3DES)
&~(kCCBlockSize3DES- 1);
bufferPtr = malloc(bufferPtrSize* sizeof(uint8_t));
memset((void*)bufferPtr,0x0, bufferPtrSize);
NSString * key = keyString;
NSString * initVec = ivString;
const void * vkey= (const void *)[key UTF8String];
const void * vinitVec= (const void *)[initVec UTF8String];
uint8_t iv[kCCBlockSize3DES];
memset((void*) iv,0x0, (size_t)sizeof(iv));
ccStatus = CCCrypt(encryptOrDecrypt,
kCCAlgorithm3DES,//加密方式
kCCOptionPKCS7Padding,
vkey,////3des加密密钥, //key
kCCKeySize3DES,
vinitVec,//3des加密密钥, //iv,
vplainText,//plainText,
plainTextBufferSize,
(void*)bufferPtr, // 注意接收加密的buffer的大小
bufferPtrSize,
&movedBytes);
//if (ccStatus == kCCSuccess) NSLog(@"SUCCESS");
if (ccStatus== kCCParamError) return @"PARAM ERROR";
else if (ccStatus == kCCBufferTooSmall) return @"BUFFER TOO SMALL";
else if (ccStatus == kCCMemoryFailure) return @"MEMORY FAILURE";
else if (ccStatus == kCCAlignmentError) return @"ALIGNMENT";
else if (ccStatus == kCCDecodeError) return @"DECODE ERROR";
else if (ccStatus == kCCUnimplemented) return @"UNIMPLEMENTED";
NSString * result;
if (encryptOrDecrypt== kCCDecrypt)
{
result = [[NSString alloc] initWithData:[NSData
dataWithBytes:(const void *)bufferPtr
length:(NSUInteger)movedBytes]
encoding:NSUTF8StringEncoding];
;
}
else
{
NSData * myData =[NSData dataWithBytes:(const void *)bufferPtr
length:(NSUInteger)movedBytes];
result = [GTMBase64 stringByEncodingData:myData];
}
return result;
}
@end
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