我试图通过DES / CBS / NOPADDING算法加密字节数据但无法获得正确的输出。我在下面的代码中给出了我所尝试的内容。请看一下并建议。
#import "STEncryptViewController.h"
#import <CommonCrypto/CommonCryptor.h>
#import "STEncryptorDES.h"
#import "NSData+Base64.h"
#import <CommonCrypto/CommonDigest.h>
#define KEY @"MY_TEST_KEY"
@interface STEncryptViewController ()
@end
@implementation STEncryptViewController
@synthesize message;
@synthesize encrypted;
@synthesize decrypted;
@synthesize key;
@synthesize outputMessage;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
}
- (IBAction)encrypt:(id)sender
{
const unsigned char bytes[] = {65,17,17,17,17,17,17,17};
NSData *data = [NSData dataWithBytes:bytes length:sizeof(bytes)];
NSString *str = self.key.text;
NSData* data12 = [str dataUsingEncoding:NSUTF8StringEncoding];
NSUInteger len = str.length;
uint8_t *bytes1 = (uint8_t *)[data12 bytes];
NSMutableString *result = [NSMutableString stringWithCapacity:len * 3];
// [result appendString:@"["];
//Key convertion
int i = 0;
while(i < len){
if (i) {
[result appendString:@","];
}
[result appendFormat:@"%d", bytes1[i]];
i++;
}
// [result appendString:@"]"];
NSLog (@"String is %@",str);
NSLog (@"Byte array is %@",result);
//
Byte iv1 [] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
Byte iv [] = {1, 35, 69, 103, -119, -85, -51, -17};
NSData *ivData = [NSData dataWithBytes:iv length:sizeof(iv)];
NSData *encryptedData = [STEncryptorDES encryptData1:data key:[NSData dataWithBytes:iv1 length:sizeof(iv1)] iv:ivData];
NSLog(@"encrypted : %@", [encryptedData base64EncodedString]);
self.outputMessage.text = [NSString stringWithFormat:@"Encrypted String ::>> %@",[encryptedData base64EncodedString]];
[self doCipher:nil enc:kCCEncrypt];
}
- (NSData *)md5DataFromString:(NSString *)input
{
const char *cStr = [input UTF8String];
unsigned char digest[16];
CC_MD5( cStr, strlen(cStr), digest ); // This is the md5 call
return [NSData dataWithBytes:digest length:CC_MD5_DIGEST_LENGTH];
}
- (IBAction)decrypt:(id)sender
{
NSData *valueData = [self hexToBytes:self.decrypted.text];
NSData *keyData = [self md5DataFromString:self.key.text];
Byte iv [] = {1, 35, 69, 103, -119, -85, -51, -17};
NSData *ivData = [NSData dataWithBytes:iv length:sizeof(iv)];
NSData *decryptedData = [STEncryptorDES decryptData:valueData key:keyData iv:ivData];
NSLog(@"decrypted : %@", [[NSString alloc] initWithData:decryptedData encoding:NSASCIIStringEncoding]);
self.outputMessage.text = [NSString stringWithFormat:@"Decrypted String ::>> %@", [[NSString alloc] initWithData:decryptedData encoding:NSASCIIStringEncoding]];
}
- (NSString*)doCipher:(NSString*)plainText enc:(CCOperation)encryptOrDecrypt{
NSData *key123 = [self hexToBytes:@"MY_TEST_KEY"];
const void *vplainText;
size_t plainTextBufferSize;
if (encryptOrDecrypt == kCCDecrypt)
{
NSData *EncryptData = [self hexToBytes:@"5454545454545454"];
// NSData *EncryptData =[NSData dataWithBase64EncodedString:plainText];
plainTextBufferSize = [EncryptData length];
vplainText = [EncryptData bytes];
}
else
{
plainTextBufferSize = [plainText length];
vplainText = (const void *) [plainText UTF8String];
}
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);
unsigned char cKey[FBENCRYPT_KEY_SIZE];
bzero(cKey, sizeof(cKey));
[key123 getBytes:cKey length:FBENCRYPT_KEY_SIZE];
//unsigned char result1[24]= {0,0,0,0,0,0,0,0,0,0,0,00,0,0,0,0,0,0,0,00,00,00,00,0};
unsigned char IV3[8]={1, 35, 69, 103, -119, -85, -51, -17};
uint8_t iv[kCCBlockSize3DES];
memset((void *) iv, 0x0, (size_t) sizeof(iv));
ccStatus = CCCrypt(encryptOrDecrypt,
kCCAlgorithm3DES,
0x0000 ,
cKey, //"123456789012345678901234", //key
kCCKeySize3DES,
IV3 , //iv,
vplainText, //plainText,
plainTextBufferSize,
(void *)bufferPtr,
bufferPtrSize,
&movedBytes);
//if (ccStatus == kCCSuccess) NSLog(@"SUCCESS");
/*else*/ 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:NSASCIIStringEncoding];
}
else
{
NSData *myData = [NSData dataWithBytes:(const void *)bufferPtr length:(NSUInteger)movedBytes];
NSLog(@"data is: %@", myData);
// result = [NSData base64StringFromData:myData length:myData.length];
// result = [[NSString alloc]initWithData:myData encoding:NSUTF8StringEncoding];
result = nil;
}
return result;
}
-(NSData*)hexToBytes:(NSString *)hex {
NSString *safeStr = [hex stringByReplacingOccurrencesOfString:@"0" withString:@"A"];
NSMutableData* data = [NSMutableData data];
int idx;
for (idx = 0; idx+2 <= safeStr.length; idx+=2) {
NSRange range = NSMakeRange(idx, 2);
NSString* hexStr = [safeStr substringWithRange:range];
NSScanner* scanner = [NSScanner scannerWithString:hexStr];
unsigned int intValue;
[scanner scanHexInt:&intValue];
[data appendBytes:&intValue length:1];
}
NSLog(@"%lu",(unsigned long)data.hash);
return data;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
这是我的全部努力。目前它正在工作，但没有预期的输出。请建议我在这里缺少什么？
答案 0 :(得分：0)
一个明显的错误是使用了STEncryptorDES并指定了填充，但问题是应该使用填充。
观察：
- 您使用nil调用doCipher并且不使用它的返回值，从问题中删除不需要/未使用的代码。
- 执行相当简单的操作有很多代码
- 似乎测试数据变量名为iv1，如果正确则使用更好的名称
- DES不应该用于新工作，只有在必要时才能与现有工作互操作，它不是很安全。新工作应使用AES
- 好几年都没有需要@synthesize。
答案 1 :(得分：-1)
在密码学＆＃34; DESede / CBC / NoPadding＆＃34;使用以下代码可能对您有所帮助。
Byte iv [] = {1, 35, 69, 103, -119, -85, -51, -17};
NSData *ivData = [NSData dataWithBytes:iv length:sizeof(iv)];
NSData key = ["MY_TEST_KEY" dataUsingEncoding:NSUTF8StringEncoding]
char cKey[key.length];
bzero(cKey, sizeof(cKey));
[key getBytes:cKey length:key.length];
// setup iv
char cIv[kCCBlockSizeDES];
bzero(cIv, kCCBlockSizeDES);
if (ivData) {
[ivData getBytes:cIv length:kCCBlockSizeDES];
}
// setup output buffer
size_t bufferSize = [data length] + kCCBlockSizeDES;
void *buffer = malloc(bufferSize);
// do encrypt
size_t encryptedSize = 0;
CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt,
kCCAlgorithm3DES,
ccNoPadding,
cKey,
key.length,
cIv,
[data bytes],
[data length],
buffer,
bufferSize,
&encryptedSize);
if (cryptStatus == kCCSuccess) {
resultData = [NSData dataWithBytes:buffer length:encryptedSize];
free(buffer);
} else {
free(buffer);
NSLog(@"[ERROR] failed to encrypt|CCCryptoStatus: %d", cryptStatus);
return nil;
}