iOS对称密钥加密/解密等同于Java

我试图加密/解密数据ios到java和java到ios但我在java中加密的数据没有在ios中正确解密，在ios中加密的数据在java中没有正确解密

- (NSData *) encrypt:(NSData *) dataToEncrypt symmetricKey:(NSData *)symmetricKey context:(CCOperation)encryptOrDecrypt{ NSUInteger data_length= [dataToEncrypt length]; uint8_t input_raw_data[data_length]; //The [dataToEncrypt length] gives the number of chars present in the string.So say there are 10 chars. //Now,the getBytes needs to get the raw bytes from this ie binary NSData.But suppose the encoding was //full 16 bit encoding then the number of bytes needed wd have been double- 20.But as we are using the //NSUTF8StringEncoding,the number of byes needed is 1 per char as the chars(even if originally unicode are //compressed into an 8 bit UTF8 encoding.) [dataToEncrypt getBytes:&input_raw_data length:data_length]; // [dataToEncrypt getBytes:&input_raw_data maxLength:data_length usedLength:NULL encoding:NSUTF8StringEncoding options:0 range:NSMakeRange(0,data_length) remainingRange:NULL]; //According to 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 buffer_size = data_length + kCCBlockSizeAES128; void* buffer = malloc(buffer_size); size_t num_bytes_encrypted = 0; CCCryptorStatus crypt_status = CCCrypt(encryptOrDecrypt, kCCAlgorithmAES128, 0x0000, [symmetricKey bytes], kCCKeySizeAES128, NULL, input_raw_data, data_length, buffer, buffer_size, &num_bytes_encrypted); // NSLog(@"~~num bytes encrypted: %d",num_bytes_encrypted); if (crypt_status == kCCSuccess){ NSLog(@"~~Data encoded successfully..."); return [NSData dataWithBytesNoCopy:buffer length:num_bytes_encrypted]; } free(buffer); //free the buffer; return nil; } 

我用过这个

Java代码 –

  Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding"); String keyString = "keykeykeykeykeykeykeykey"; byte[] keyBytes = keyString.getBytes("UTF-8"); cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(keyBytes, "AES"), new IvParameterSpec(new byte[16])); byte[] resultBytes = cipher.doFinal("Hallo Welt!".getBytes("UTF8")); FileOutputStream out = new FileOutputStream(new File("encryptedFileJava")); out.write(resultBytes); out.close(); 

这是加密文本 – “SeáJbë| 8”R，

键 – BW3dKDf2bkDC4Bq9xTdr1g ==

请帮助我或建议我任何解决方案。

谢谢。

Answer 1

你至少有两个问题：

1. Objective C代码使用ECB模式，而Java代码使用CBC模式。 在CCrypt调用中使用零字节而不是NULL来使用具有零IV的CBC模式，如Java代码。

2. 由于keyBytes长度为24个字节，因此Java将使用AES-192。 CCrypt将忽略额外的字节。 指定AES-192到CCrypt或使用128位密钥（“keykeykeykeykeyk”应该工作）。

Answer 2

对于IOS和Java设备之间的安全通信，可以使用对称密钥加密。

在平台不同的情况下，建议生成的密钥是纯文本密钥而不是API生成密钥。

在这种情况下可以使用AES 128位加密。 IOS设备能够生成对称密钥并使用AES加密对文本进行加密。

下面的链接提供了使用纯文本对称密钥加密和解密的java代码

http://www.java-redefined.com/2015/06/symmetric-key-encryption-ios-java.html