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[英]Different AES128 with zero padding encryption result between php and java
[英]AES128 CBC encryption in Java and Objective C giving different outputs
我的Java和客观C加密方法正在产生不同的输出-AES128,CBC模式。
键: YnA+lracf9xaiJO1oA/bTQ==
iV: 190Dt3MNeL32o9Kd37HZlQ==
纯文本: text to encrypt
Java输出: mHZpz52LOK2K76t3B/EUuA==
目标C输出: Fb0D46H4tN+ukgI05x/Dbg==
Java代码:
public static String AESEncrypt(String text, String key, String iv) throws Exception {
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
byte[] keyBytes = new byte[16];
byte[] b = key.getBytes("UTF-8");
int len = b.length;
if (len > keyBytes.length)
len = keyBytes.length;
System.arraycopy(b, 0, keyBytes, 0, len);
byte[] keyBytesiv = new byte[16];
byte[] biv = iv.getBytes("UTF-8");
int leniv = biv.length;
if (leniv > keyBytesiv.length)
leniv = keyBytesiv.length;
System.arraycopy(biv, 0, keyBytes, 0, len);
SecretKeySpec keySpec = new SecretKeySpec(keyBytes, "AES");
IvParameterSpec ivSpec = new IvParameterSpec(keyBytesiv);
cipher.init(Cipher.ENCRYPT_MODE, keySpec, ivSpec);
byte[] results = cipher.doFinal(text.getBytes("UTF-8"));
BASE64Encoder encoder = new BASE64Encoder();
return encoder.encode(results);
}
目标C代码
+ (NSData *)AESOperation:(CCOperation)operation OnData:(NSData *)data key:(NSData *)key iV:(NSData *) iv {
NSUInteger dataLength = [data length];
size_t bufferSize = dataLength + kCCBlockSizeAES128;
void *buffer = malloc(bufferSize);
size_t numBytesEncrypted = 0;
CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt,
kCCAlgorithmAES128,
kCCOptionPKCS7Padding,
[key bytes],
kCCBlockSizeAES128,
[iv bytes],
[data bytes],
dataLength,
buffer,
bufferSize,
&numBytesEncrypted);
if (cryptStatus == kCCSuccess) {
return [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];
}
free(buffer);
return nil;
}
有两种解决此类问题的方法,可以结合使用:
作为健全性检查,请尝试解密两种语言的加密文本,然后查看它们是否与原始文本匹配。
尝试使用另一个库(第三个库),然后与前两个值进行比较。
因此,我尝试使用在线工具解密密文,并且可以使用Objective C输出恢复原始文本(“要加密的文本”)。 它表明Java代码有问题。 我怀疑这可能与输入(键,iv)是base64编码的事实有关,而它似乎只是被视为UTF-8编码( getBytes()
调用)。
由于上述建议,我得以解决Java代码上的问题。 这是为我在Java和目标C上实现AES128 CBC模式而工作的Java代码
public static String AESEncrypt(String text, String key, String iv) throws Exception {
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
byte[] keyBytes = new byte[16];
byte[] b = new BASE64Decoder().decodeBuffer(key);
int len = b.length;
if (len > keyBytes.length)
len = keyBytes.length;
System.arraycopy(b, 0, keyBytes, 0, len);
byte[] keyBytesiv = new byte[16];
byte[] biv = new BASE64Decoder().decodeBuffer(iv);
int leniv = biv.length;
if (leniv > keyBytesiv.length)
leniv = keyBytesiv.length;
System.arraycopy(biv, 0, keyBytesiv, 0, len);
SecretKeySpec keySpec = new SecretKeySpec(keyBytes, "AES");
IvParameterSpec ivSpec = new IvParameterSpec(keyBytesiv);
cipher.init(Cipher.ENCRYPT_MODE, keySpec, ivSpec);
byte[] results = cipher.doFinal(text.getBytes("UTF-8"));
BASE64Encoder encoder = new BASE64Encoder();
return encoder.encode(results);
}
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