我试图解密IOS中的文件。该文件在C#应用程序中使用AES加密。IOS中的AES解密没有给出确切的结果
这是我的IOS解密方法:
- (NSData *)AES128Operation:(CCOperation)operation key:(NSString *)key iv:(NSString *)iv
{
NSLog(@"inside AES128Operation");
char keyPtr[kCCKeySizeAES128 + 1];
bzero(keyPtr, sizeof(keyPtr));
[key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];
char ivPtr[kCCBlockSizeAES128 + 1];
bzero(ivPtr, sizeof(ivPtr));
if (iv) {
[iv getCString:ivPtr maxLength:sizeof(ivPtr) encoding:NSUTF8StringEncoding];
}
NSUInteger dataLength = [self length];
size_t bufferSize = dataLength + kCCBlockSizeAES128;
void *buffer = malloc(bufferSize);
size_t numBytesEncrypted = 0;
CCCryptorStatus cryptStatus = CCCrypt(operation,
kCCAlgorithmAES128,
kCCOptionPKCS7Padding | kCCOptionECBMode,
keyPtr,
kCCBlockSizeAES128,
ivPtr,
[self bytes],
dataLength,
buffer,
bufferSize,
&numBytesEncrypted);
if (cryptStatus == kCCSuccess) {
return [NSData dataWithBytes:buffer length:numBytesEncrypted];
}
free(buffer);
return nil;
}
,并用它的即时通讯方式:
NSString *strKey = MyKey;
NSString *strIv = MyIV;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory , NSUserDomainMask, YES);
NSString *documentsDir = [paths objectAtIndex:0];
NSString *pathLocal_encrypted = [documentsDir stringByAppendingPathComponent:@"encrypted.file"];
NSData *data_encrpted = [[NSFileManager defaultManager] contentsAtPath:pathLocal_encrypted];
NSData *decryptedData = [data_encrpted AES128DecryptedDataWithKey:strKey iv:strIv];
IV是一个8字节的矢量。 最终解密的文件不可读或严重解密。 我也尝试过使用“AES128Operation”方法在一些测试文件中加密/解密ios应用程序,它运行良好,但不知道为什么它不能解密C#加密文件。
解密在C#中使用此代码(相同的档案,IV,同样,密钥)效果很好:
static byte[] GetBytes(string str)
{
byte[] bytes = new byte[str.Length * sizeof(char)];
System.Buffer.BlockCopy(str.ToCharArray(), 0, bytes, 0, bytes.Length);
return bytes;
}
private static byte[] DecryptBytes(SymmetricAlgorithm alg, byte[] message)
{
if ((message == null) || (message.Length == 0))
{
return message;
}
using (var stream = new MemoryStream())
{
using (var decryptor = alg.CreateDecryptor())
using (var encrypt = new CryptoStream(stream, decryptor, CryptoStreamMode.Write))
{
encrypt.Write(message, 0, message.Length);
encrypt.FlushFinalBlock();
}
return stream.ToArray();
}
}
path = openFileDialog1.FileName;
byte[] encMessage = StreamFile(path);
byte[] decMessage;
byte[] rkey = GetBytes(Mykey);
byte[] riv = GetBytes(MyIv);
using (var rijndael = new RijndaelManaged())
{
rijndael.Key = rkey;
rijndael.IV = riv;
decMessage = DecryptBytes(rijndael, encMessage);
}
由于回答的建议香港专业教育学院试图这样一来,但仍然没有希望:
NSData *key = [NSData dataWithData:[strKey dataUsingEncoding:NSUTF8StringEncoding]];
NSData *iv = [NSData dataWithData:[strIv dataUsingEncoding:NSUTF8StringEncoding]];
NSData *decryptedData = [self doCipher:data_encrpted iv:iv key:key context:kCCDecrypt];
和新功能:
- (NSData *)doCipher:(NSData *)dataIn
iv:(NSData *)iv
key:(NSData *)symmetricKey
context:(CCOperation)encryptOrDecrypt
{
CCCryptorStatus ccStatus = kCCSuccess;
size_t cryptBytes = 0; // Number of bytes moved to buffer.
NSMutableData *dataOut = [NSMutableData dataWithLength:dataIn.length + kCCBlockSizeAES128];
ccStatus = CCCrypt(encryptOrDecrypt,
kCCAlgorithmAES128,
kCCOptionPKCS7Padding,
symmetricKey.bytes,
kCCKeySizeAES128,
iv.bytes,
dataIn.bytes,
dataIn.length,
dataOut.mutableBytes,
dataOut.length,
&cryptBytes);
NSLog(@"CCCrypt status: %d", ccStatus);
dataOut.length = cryptBytes;
NSLog(@"CCCrypt ataOut.length: %d", dataOut.length);
return dataOut;
}
这里面C#加密\解密设置:
public RijndaelManaged GetRijndaelManaged(string secretKey, string iv)
{
var keyBytes = new byte[16];
var secretKeyBytes = Encoding.UTF8.GetBytes(secretKey);
Array.Copy(secretKeyBytes, keyBytes, Math.Min(keyBytes.Length, secretKeyBytes.Length));
var ivBytes = new byte[16];
var secretIvBytes = Encoding.UTF8.GetBytes(iv);
Array.Copy(secretIvBytes, ivBytes, Math.Min(ivBytes.Length, secretIvBytes.Length));
return new RijndaelManaged
{
Mode = CipherMode.CBC,
Padding = PaddingMode.PKCS7,
KeySize = 128,
BlockSize = 128,
Key = keyBytes,
IV = ivBytes
};
}
public byte[] Encrypt(byte[] plainBytes, RijndaelManaged rijndaelManaged)
{
return rijndaelManaged.CreateEncryptor()
.TransformFinalBlock(plainBytes, 0, plainBytes.Length);
}
public byte[] Decrypt(byte[] encryptedData, RijndaelManaged rijndaelManaged)
{
return rijndaelManaged.CreateDecryptor()
.TransformFinalBlock(encryptedData, 0, encryptedData.Length);
}
检查了C#中使用哪种填充和模式? – Doro
问题是我没有访问C#加密方法的源代码。 但是当我使用默认rijndael解密设置它效果很好。 –
@AndreyMarkov在[SO问题](http://stackoverflow.com/q/31067324/451475)中查看问题和答案。顺便说一句,这些问题之间有一些联系吗?他们非常相似,彼此之间互相问了一个小时。 – zaph