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POiPhone 3Des Encrypting matching Java and .NET key issue, SecretKeySpec?
 

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  1. POiPhone 3Des Encrypting matching Java and .NET key issue, SecretKeySpec?
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    <p>I'm trying do some encrypt something using 3des on the iphone that must match the results from java and .NET.</p> <p>the code i have is:</p> <pre><code>+ (NSString*) doCipher:(NSString*)plainText:(CCOperation)encryptOrDecrypt { const void *vplainText; size_t plainTextBufferSize; if (encryptOrDecrypt == kCCDecrypt) { NSData *EncryptData = [NSData dataWithBase64EncodedString:plainText]; plainTextBufferSize = [EncryptData length]; vplainText = [EncryptData bytes]; } else { NSData *tempData = [plainText dataUsingEncoding:NSASCIIStringEncoding]; plainTextBufferSize = [tempData length]; vplainText = [tempData bytes]; } CCCryptorStatus ccStatus; uint8_t *bufferPtr = NULL; size_t bufferPtrSize = 0; size_t movedBytes = 0; // uint8_t ivkCCBlockSize3DES; bufferPtrSize = (plainTextBufferSize + kCCBlockSize3DES) &amp; ~(kCCBlockSize3DES - 1); bufferPtr = malloc( bufferPtrSize * sizeof(uint8_t)); memset((void *)bufferPtr, 0x0, bufferPtrSize); NSString *key = [NSString MD5:@"HSDNIFFU"]; NSData *_keyData = [key dataUsingEncoding:NSASCIIStringEncoding]; NSLog(@"key byte is %s", [_keyData bytes]); // Initialization vector; dummy in this case 0's. uint8_t iv[kCCBlockSize3DES]; memset((void *) iv, 0x0, (size_t) sizeof(iv)); ccStatus = CCCrypt(encryptOrDecrypt, kCCAlgorithm3DES, kCCOptionPKCS7Padding, (const void *)[_keyData bytes], //"123456789012345678901234", //key kCCKeySize3DES, iv, //iv, vplainText, //plainText, plainTextBufferSize, (void *)bufferPtr, bufferPtrSize, &amp;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]]; result = [[[NSString alloc] initWithData:[NSData dataWithBytes:(const void *)bufferPtr length:(NSUInteger)movedBytes] encoding:NSASCIIStringEncoding] autorelease]; } else { NSData *myData = [NSData dataWithBytes:(const void *)bufferPtr length:(NSUInteger)movedBytes]; NSLog(@"data is: %@", myData); result = [myData base64Encoding]; } return result; </code></pre> <p>} </p> <p>This code successfully encrypts and decrypts a string. As you can see, it uses md5 on the key. However, it does not match the results from .NET and java.</p> <p>The java code from the java developer looks like:</p> <pre><code>public static byte[] encryptTripleDES(String message) throws Exception { final MessageDigest md = MessageDigest.getInstance("md5"); final byte[] digestOfPassword = md.digest("--KEY--".getBytes("utf-8")); final SecretKey key = new SecretKeySpec(digestOfPassword, "DESede"); final IvParameterSpec iv = new IvParameterSpec(new byte[8]); final Cipher cipher = Cipher.getInstance("DESede/CBC/PKCS5Padding"); cipher.init(Cipher.ENCRYPT_MODE, key, iv); return cipher.doFinal(message.getBytes("utf-8")); } </code></pre> <p>Unfortunately I'm not too familiar with java encryption. I did notice that after using md5 on the KEY it creates a SecretKey with the method SecretKeySpec. My Java developer told me that he needed to create a secretkey using the byte array of the key so that it could match the .NET key. </p> <p>Can anyone explain this better to me and help me with a solution to match the results of the .NET and java counterparts?</p>
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