vsinghidrbt.ac.in
Date: Sun Mar 13 2005 - 23:14:27 CST

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Dear sir,
thanks a lot for your suggestion.it was of great help.
but i further want some favour fron you regarding the same.
that muscletool program, docrypt function, is in one line showing it is not using any padding
 cryptInit.cipherMode = MSC_MODE_RSA_NOPAD;
and then in next line it is using a function :
padData(inCryptData, inDataSize, keySize);
i am not able to find this paddata function so that i can modify the program according to my requirement.
is it using some padding or mode or not.i just want to use RSA with no padding.
Moreover i want to remove bintohex format in my output and want bintobytes format
as output i.e. output in bytes format.
Kindly tell me what changes i need to do in my program to suit these two requirements.
i would not like to alter the process ,as it given in the program i.e.encryption using privatekey.
i will be very thankful if you can help me with these problems.
thanks and regards
vigya
-- Original Message --
From: "Peter Williams" <home_pwmsn.com>
To: "MUSCLE" <musclelists.musclecard.com>
Date: Sat, 12 Mar 2005 08:34:33 -0800
Subject: Re: [Muscle] Encryption /Signature in muscle tool
A long time ago, I believe I altered muscleTool's void doCrypt() method.
>You can do the same to invoke encrypt/decrypt cipher modes across the
>interface. See below.
>
>In my modifications, I altered the sign feature, to invoke the applet's use
>of PKCS#1 padding, rather than use "block encryption using the private key
>transform." I don't recall if the removal of the hex2bin formatter on the
>in/out stream was me, or was there in the CVS source. The formatter
>hows - in any case - where you can apply additional processing, before and
>after the RSA decryption (using private key) operation.
>
>If you use the existing "sign" function in its original muscle form (with
>RSA_RAW), and you first format your plaintext in an OAEP wrapper, you have
>block encipherment exploiting randomness properties of the wrapping oracle.
>Remember to keep the public key a secret, in such a mechanism.
>
>This is the converse of the process specified in the documented cited
>below. Using RSA decryption as an enciphering function over an RSA_RAW
>block (using the private-key transform) may subject you to professional
>censure, note; so, be warned! But you get the idea. Go alter the code - to
>suit project requirements.
>
>citation:
>ftp://ftp.rsasecurity.com/pub/rsalabs/rsa_algorithm/rsa-oaep_spec.pdf
>
>
>
>" if(strcmp(arg3, "sign") ==0 )
> cipherDir = (MSCUChar8)1;
> else if(strcmp(arg3, "verify") ==0 )
> cipherDir = (MSCUChar8)2;
> else {
> printf("ERR: Invalid Use: crypt [keynum] [sign/verify]\n");
> return;
> }
> //inDataSize = hexToBin(hexString, inCryptData);
>
> rv = MSCGetKeyAttributes( pConnection, (MSCUChar8)keyNum, &keyInfo );
> CHECK_ERR(rv != MSC_SUCCESS, "GetKeyAttributes Failed !");
>
> keySize = keyInfo.keySize / 8;
>
> cryptInit.keyNum = (MSCUChar8)keyNum;
>#if 0
> cryptInit.cipherMode = MSC_MODE_RSA_NOPAD;
>#else
> cryptInit.cipherMode = MSC_MODE_RSA_PAD_PKCS1
>;
>#endif
> cryptInit.cipherDirection = cipherDir;
> cryptInit.optParams = 0;
> cryptInit.optParamsSize = 0;
>
> //padData(inCryptData, inDataSize, keySize);
> //inDataSize = outDataSize = keySize;
>
> //binToHex(inCryptData, inDataSize, outCryptData);
>
> rv = MSCComputeCrypt( pConnection, &cryptInit,
> inCryptData, inDataSize,
> outCryptData, &outDataSize);
>
>
>----- Original Message -----
>From: "vsingh" <vsinghidrbt.ac.in>
>To: <musclelists.musclecard.com>
>Sent: Saturday, March 12, 2005 12:39 AM
>Subject: [Muscle] Encryption /Signature in muscle tool
>
>
>> Hi All!
>> can any one please help me with this problem:
>> i am using muscle tool provided with muscleframework 1.1.3.
>> there is an option of performimg a "Crypt" function in muscle tool.can
>> anyone tell me is that a function for "Encryption" or "Signature" using
>> Private key.
>> one more thing:Which "mode" and "padding" is being used by RSA in this
>> case for performing this Crypt function.
>> please help me if anyone is aware of it.
>> thanks
>> vigya
>>
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>>
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