如何使我的AES加密与Java和Objective-C（iPhone）相同？ [英] How can I make my AES encryption identical between Java and Objective-C (iPhone)?
问题描述
我正在使用一个源字符串现在这个废话是什么，你知道吗？
使用1234567890123456的密钥
要加密的objective-c代码如下：注意：它是一个NSData类别，因此假定该方法是调用一个NSData对象，所以'self'包含要加密的字节数据。
- （NSData *）AESEncryptWithKey：（NSString * ）键{
char keyPtr [kCCKeySizeAES128 + 1]; //用于终结器的空间（未使用）
bzero（keyPtr，sizeof（keyPtr））; //填充零（用于填充）
//获取密钥数据
[key getCString：keyPtr maxLength：sizeof（keyPtr）encoding：NSUTF8StringEncoding];
NSUInteger dataLength = [self length];
//查看文档：对于块密码，输出大小始终小于或等于输入大小加上一个块的大小。
//这就是为什么我们需要在这里添加一个块的大小
size_t bufferSize = dataLength + kCCBlockSizeAES128;
void * buffer = malloc（bufferSize）;
size_t numBytesEncrypted = 0;
CCCryptorStatus cryptStatus = CCCrypt（kCCEncrypt，kCCAlgorithmAES128，kCCOptionPKCS7Padding，
keyPtr，kCCKeySizeAES128，
NULL / *初始化向量（可选）* /，
[self bytes]，dataLength， * input * /
buffer，bufferSize，/ * output * /
& numBytesEncrypted）;
if（cryptStatus == kCCSuccess）{
//返回的NSData获取缓冲区的所有权，并在释放后释放它
return [NSData dataWithBytesNoCopy：buffer length：numBytesEncrypted];
}
free（buffer）; //释放缓冲区;
return nil;
}
Java加密代码是...
public byte [] encryptData（byte [] data，String key）{
byte [] encrypted = null;
Security.addProvider（new org.bouncycastle.jce.provider.BouncyCastleProvider（））;
byte [] keyBytes = key.getBytes（）;
SecretKeySpec keySpec = new SecretKeySpec（keyBytes，AES）;
try {
密码密码= Cipher.getInstance（AES / ECB / PKCS7Padding，BC）;
cipher.init（Cipher.ENCRYPT_MODE，keySpec）;
encrypted = new byte [cipher.getOutputSize（data.length）];
int ctLength = cipher.update（data，0，data.length，encrypted，0）;
ctLength + = cipher.doFinal（encrypted，ctLength）;
} catch（Exception e）{
logger.log（Level.SEVERE，e.getMessage（））;
} finally {
return encrypted;
}
}
目标c代码的十六进制输出是 -
7a68ea36 8288c73d f7c45d8d 22432577 9693920a 4fae38b2 2e4bdcef 9aeb8afe 69394f3e 1eb62fa7 74da2b5c 8d7b3c89 a295d306 f1f90349 6899ac34 63a6efa0
，java输出是 -
7a68ea36 8288c73d f7c45d8d 22432577 e66b32f9 772b6679 d7c0cb69 037b8740 883f8211 748229f4 723984beb 50b5aea1 f17594c9 fad2d05e e0926805 572156d
正如你可以看到的一切都是罚款到 -
7a68ea36 8288c73d f7c45d8d 22432577
我猜想我有一些不同的设置，但是无法解决什么，我尝试在Java端在ECB和CBC之间切换，并且没有任何效果。
任何人都可以帮忙！请求....
由于CCCrypt采用IV，它不使用链接块密码方法（如CBC ）？这将与您所看到的一致：第一个块是相同的，但在第二个块中，Java版本应用原始密钥进行加密，但是OSX版本似乎使用其他东西。
编辑：
从这里我看到一个例子。似乎你需要将kCCOptionECBMode传递给CCCrypt：
ccStatus = CCCrypt（encryptOrDecrypt，
kCCAlgorithm3DES，
kCCOptionECBMode，< - 这可以帮助
vkey，//123456789012345678901234，// key
kCCKeySize3DES，
nil，//init Vec，// iv，
vplainText，//Your Name，// plainText，
plainTextBufferSize，
（void *）bufferPtr，
bufferPtrSize，
& movedBytes）;
编辑2：
用一些命令行来看看哪一个是正确的。我以为我可以做出贡献：
$ echo现在这个废话是什么，你知道吗？ | openssl enc -aes-128-ecb -K $（echo 1234567890123456 | xxd -p）-iv 0 | xxd
0000000：7a68 ea36 8288 c73d f7c4 5d8d 2243 2577 zh.6 ... = ..]。C％w
0000010：e66b 32f9 772b 6679 d7c0 cb69 037b 8740 .k2.w + fy ... i。{。@
0000020：883f 8211 7482 29f4 7239 84be b50b 5aea。？.. t。）r9 .... Z。
0000030：eaa7 519b 65e8 fa26 a1bb de52 083b 478f .. Qe。& ... R.; G。
I am encrypting a string in objective-c and also encrypting the same string in Java using AES and am seeing some strange issues. The first part of the result matches up to a certain point but then it is different, hence when i go to decode the result from Java onto the iPhone it cant decrypt it.
I am using a source string of "Now then and what is this nonsense all about. Do you know?" Using a key of "1234567890123456"
The objective-c code to encrypt is the following: NOTE: it is a NSData category so assume that the method is called on an NSData object so 'self' contains the byte data to encrypt.
- (NSData *)AESEncryptWithKey:(NSString *)key {
char keyPtr[kCCKeySizeAES128+1]; // room for terminator (unused)
bzero(keyPtr, sizeof(keyPtr)); // fill with zeroes (for padding)
// fetch key data
[key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];
NSUInteger dataLength = [self length];
//See the doc: For block ciphers, the output size will always be less than or
//equal to the input size plus the size of one block.
//That's why we need to add the size of one block here
size_t bufferSize = dataLength + kCCBlockSizeAES128;
void *buffer = malloc(bufferSize);
size_t numBytesEncrypted = 0;
CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt, kCCAlgorithmAES128, kCCOptionPKCS7Padding,
keyPtr, kCCKeySizeAES128,
NULL /* initialization vector (optional) */,
[self bytes], dataLength, /* input */
buffer, bufferSize, /* output */
&numBytesEncrypted);
if (cryptStatus == kCCSuccess) {
//the returned NSData takes ownership of the buffer and will free it on deallocation
return [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];
}
free(buffer); //free the buffer;
return nil;
}
And the java encryption code is...
public byte[] encryptData(byte[] data, String key) {
byte[] encrypted = null;
Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
byte[] keyBytes = key.getBytes();
SecretKeySpec keySpec = new SecretKeySpec(keyBytes, "AES");
try {
Cipher cipher = Cipher.getInstance("AES/ECB/PKCS7Padding", "BC");
cipher.init(Cipher.ENCRYPT_MODE, keySpec);
encrypted = new byte[cipher.getOutputSize(data.length)];
int ctLength = cipher.update(data, 0, data.length, encrypted, 0);
ctLength += cipher.doFinal(encrypted, ctLength);
} catch (Exception e) {
logger.log(Level.SEVERE, e.getMessage());
} finally {
return encrypted;
}
}
The hex output of the objective-c code is -
7a68ea36 8288c73d f7c45d8d 22432577 9693920a 4fae38b2 2e4bdcef 9aeb8afe 69394f3e 1eb62fa7 74da2b5c 8d7b3c89 a295d306 f1f90349 6899ac34 63a6efa0
and the java output is -
7a68ea36 8288c73d f7c45d8d 22432577 e66b32f9 772b6679 d7c0cb69 037b8740 883f8211 748229f4 723984beb 50b5aea1 f17594c9 fad2d05e e0926805 572156d
As you can see everything is fine up to -
7a68ea36 8288c73d f7c45d8d 22432577
I am guessing I have some of the settings different but can't work out what, I tried changing between ECB and CBC on the java side and it had no effect.
Can anyone help!? please....
Since the CCCrypt takes an IV, does it not use a chaining block cipher method (such as CBC)? This would be consistant with what you see: the first block is identical, but in the second block the Java version applies the original key to encrypt, but the OSX version seems to use something else.
EDIT:
From here I saw an example. Seems like you need to pass the kCCOptionECBMode to CCCrypt:
ccStatus = CCCrypt(encryptOrDecrypt,
kCCAlgorithm3DES,
kCCOptionECBMode, <-- this could help
vkey, //"123456789012345678901234", //key
kCCKeySize3DES,
nil, //"init Vec", //iv,
vplainText, //"Your Name", //plainText,
plainTextBufferSize,
(void *)bufferPtr,
bufferPtrSize,
&movedBytes);
EDIT 2:
I played around with some command line to see which one was right. I thought I could contribute it:
$ echo "Now then and what is this nonsense all about. Do you know?" | openssl enc -aes-128-ecb -K $(echo 1234567890123456 | xxd -p) -iv 0 | xxd
0000000: 7a68 ea36 8288 c73d f7c4 5d8d 2243 2577 zh.6...=..]."C%w
0000010: e66b 32f9 772b 6679 d7c0 cb69 037b 8740 .k2.w+fy...i.{.@
0000020: 883f 8211 7482 29f4 7239 84be b50b 5aea .?..t.).r9....Z.
0000030: eaa7 519b 65e8 fa26 a1bb de52 083b 478f ..Q.e..&...R.;G.
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