Hi,
I have a rather complicated situation in the sense that I need to
realize licensing checks of software. This is done through a config file
that is signed through a USB smartcard (crypto-token). Next to that, I
have a symmetric blowfish key that I need for that. This key has been
encrypted (yes, an encrypted encryptionkey :-)) by an RSA-private key.
However, when I try to use openssl to decrypt using the corresponding
RSA-public key, I get:
A private key is needed for this operation
The command used is:
openssl rsautl -decrypt -pubin -inkey myrsakey.pub -in blowfish.enc
The blowfish.enc file was generated through:
dd if=/dev/random of=blowfishkey bs=16 count=1
openssl rsautl -encrypt -in blowfishkey -out blowfishkey.enc \
-inkey myrsakey.key
I use:
OpenSSL 0.9.7g 11 Apr 2005
I know RSA encryption and decryption can only be used for very small
pieces of data. I need to encrypt more data, so I use a symmetric key to
encrypt and decrypt data and I make sure the key used to encrypt stuff
was encrypted by myself.
So in short: why can't I decrypt data with an RSA public key that has
been encrypted with the corresponding RSA private key?
BTW: I have to do this in Python (sorry, wasn't my choice :-( ), so I
can't use the RSA_public_decrypt() subroutine which, judging from
internet comments, *can* actually decrypt data with an RSA public key...
Any comments are welcome. Thanks in advance.
Kind regards,
Simon de Hartog
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