cryptix-users

[Cryptix-users] RSA keys that use the IDEA cipher

[noreen <nor...@gm...>]

Do RSA legacy keys always use key type RSA and the IDEA cipher? How do 
you create an RSA key with cipher=IDEA?

I have included the code so far with the error that was generated:

//create an RSA key
KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance( "RSA" );
this.cipher = Cipher.getInstance("RSA");
keyPairGen.initialize( 1024 );

// use the key to initialize the idea cipher
this.cipher = Cipher.getInstance("IDEA", "CryptixCrypto");
cipher.init( Cipher.ENCRYPT_MODE, keyParirGen.getKeyPair.getPublic() );


CODE OUTPUT
cipher algorithm IDEA   BlockSize=8
KeyPair Algorithm RSA
Key AlgorithmRSA    format= X.509    serialVersionID=-8727434096241101194
Invalid user key length
java.security.InvalidKeyException: Invalid user key length
        at cryptix.jce.provider.cipher.IDEA.makeKey(IDEA.java:156)
        at cryptix.jce.provider.cipher.IDEA.coreInit(IDEA.java:78)
        at cryptix.jce.provider.cipher.ModeECB.coreInit(ModeECB.java:53)
        at cryptix.jce.provider.cipher.Mode.init(Mode.java:115)
        at cryptix.jce.provider.cipher.Padding.init(Padding.java:154)
        at 
cryptix.jce.provider.cipher.BlockCipher.engineInit(BlockCipher.java:286)
        at 
cryptix.jce.provider.cipher.BlockCipher.engineInit(BlockCipher.java:271)
        at javax.crypto.Cipher.init(DashoA13*..)
        at javax.crypto.Cipher.init(DashoA13*..)
        at Crypt.<init>(Crypt.java:44)
        at Crypt.main(Crypt.java:84)

Re: [Cryptix-users] RSA keys that use the IDEA cipher

[Ian G <ia...@sy...>]

noreen wrote:
> 
> Do RSA legacy keys always use key type RSA and the IDEA cipher? How do 
> you create an RSA key with cipher=IDEA?

PGP 2.6 and before were RSA+IDEA only.  in PGP5.0, variations were added 
to both axes, and IDEA was deprecated because it was a patented 
algorithm or somesuch, so most switched over to DSS+3DES or RSA+3DES.

However, this is only PGP 2.6, whereas below you have a format=x.509 key 
which is not PGP.


> I have included the code so far with the error that was generated:
> 
> //create an RSA key
> KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance( "RSA" );
> this.cipher = Cipher.getInstance("RSA");
> keyPairGen.initialize( 1024 );
> 
> // use the key to initialize the idea cipher
> this.cipher = Cipher.getInstance("IDEA", "CryptixCrypto");
> cipher.init( Cipher.ENCRYPT_MODE, keyParirGen.getKeyPair.getPublic() );

Is that the right arguments?  I cannot recall what init does, but I 
imagine you have to provide it with a secret keyphrase of the right 
length, not the public key.

iang


> CODE OUTPUT
> cipher algorithm IDEA   BlockSize=8
> KeyPair Algorithm RSA
> Key AlgorithmRSA    format= X.509    serialVersionID=-8727434096241101194
> Invalid user key length
> java.security.InvalidKeyException: Invalid user key length
>         at cryptix.jce.provider.cipher.IDEA.makeKey(IDEA.java:156)