Re: RSA keys

OpenSSL uses the PKCS#1 private key format which contains the same
elements as the FreeS/WAN private key format with the difference
that the encoding is in binary DER format based on the
following ASN.1 object definition:

RSAPrivateKey ::= SEQUENCE {
    version          INTEGER { rsaPrivateKeyVer0(0) }(rsaPrivateKeyVer0),
    modulus          INTEGER, -- (Usually large) n
    publicExponent   INTEGER, -- (Usually small) e
    privateExponent  INTEGER, -- (Usually large) d
    prime1           INTEGER, -- (Usually large) p
    prime2           INTEGER, -- (Usually large) q
    exponent1        INTEGER, -- (Usually large) d mod (p-1)
    exponent2        INTEGER, -- (Usually large) d mod (q-1)
    coefficient      INTEGER  -- (Usually large) (inverse of q) mod p
}

To my knowledge nobody has written a tool yet that does
the conversion from FreeS/WAN ASCII format into binary DER format.

Such a tool could easily built using either the OpenSSL library or
some ASN.1 Perl modules. Unfortunately I haven't found the
time yet to do it.

Regards

Andreas

Roberto Barcellona wrote:
> I have to convert the public/private RSA keys format of FreeS/WAN in the RSA 
> keys format of Openssl library. Does someone know the simplest way of doing 
> it? 
>  
> Thanks in advance. 
> 
> 
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