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POdecrypting using rijndael. DCPcrypt library. Delphi
 

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  1. POdecrypting using rijndael. DCPcrypt library. Delphi
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    <p>I have a IV (initialization vector) and key, also a cryptogram. I need do decrypt the cryptogram. From the internet i found <a href="http://www.cityinthesky.co.uk/cryptography.html" rel="nofollow">DCPcrypt Cryptographic Component Library v2</a>. So, now i've reached to coding.</p> <pre><code>procedure TForm1.Button1Click(Sender: TObject); var key:Ansistring; ivector,indata,outdata:string; begin key := 'abc12345679'; //&lt;--key for decrypting dcp_rijndael1.InitStr(key,TDCP_sha1); //I don't understand why i need hashing!? ivector := edit2.Text; //initialization vector dcp_rijndael1.SetIV(ivector); dcp_rijndael1.BlockSize := Length(ivector); //'This variable should be the same size as the block size' says the documentation indata := edit1.Text; //getting the cryptogram dcp_rijndael1.CipherMode := cmCBC; dcp_rijndael1.DecryptCBC(indata,outdata,Length(indata)); label3.Caption := outdata; //output to label end; </code></pre> <p>This code gives me an error. "Local Variables" window shows indata, outdata, ivector, key variables as 'Inaccessible value'. Or maybe is there another way to do it. This seems pretty straight forward, though. Thanks in advance.</p> <p><strong>After Wodzu help:</strong> Notice, that i receive decrypted string encoded with base64, so i guess, i need to decode it first.</p> <pre><code>var Form1: TForm1; StringToEncrypt, StringToDecrypt, DecryptedString: string; vector:string; procedure TForm1.Button2Click(Sender: TObject); begin vector := '1234567812345678'; //Length 16 stringtodecrypt := '2YOXZ20Z7B3TRI/Ut8iH/GpEZWboE2tnnWU'; stringtodecrypt := Decode64(stringtodecrypt); //after encrypted string is sent over internet, it is encoded with base64, so i need to decode it. SetLength(DecryptedString, 36); //36 is the length of the output DCP_rijndael1.Init('MyKey:128bit', 128, @Vector[1]); DCP_rijndael1.SetIV(Vector); DCP_rijndael1.BlockSize := Length(Vector); //Should this be also 128 DCP_rijndael1.DecryptCBC(StringToDecrypt[1], DecryptedString[1], Length(StringToDecrypt)*2); //Here i get hieroglyph as a result. Why is length multiplied with 2? decryptedstring := Encode64(decryptedstring); //Here i get less hieroglyph, but would like to get correct decrypted string. I doubt the necessity of encoding ShowMessage(DecryptedString); end; </code></pre> <p>I can't make this code to decrypt data that somebody else is encrypting (with PHP) (after encrypting the data is encoded with base64). <strong>Note!</strong> encrypted text length is not the same as the decrypted text length!</p>
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      1. POdecrypting using rijndael. DCPcrypt library. Delphi
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    1. COAnd the **exact** error message is?
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    2. COI do not see constructor for the dcp_rijndael1 anywhere in your code, this might be the problem. To see local variables you need to turn off the compiler optimization.
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    3. COthis error is not associated with the decryption. After calling DecryptCBC method 'indata', 'outdata' and other variables become 'inaccessible value', so when i try to set label's caption using one of inaccessible variables i get error. I guess i'm doing something wrong, so assigning data to labels is a minor problem.
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