Hello!
I want to use openssl generated rsa keys in my custom rsa
implementation. In order to do this, I have to interpret the
binary file created by: (host.key is the rsa key file)
$ openssl enc -d -base64 -in host.key
I suppose the funny outputs are the bignums from the
struct rsa_st (crypto/rsa/rsa.h)
However, if I display the key file in human readable format,
$ openssl rsa -text -in host.key
open the binary output from the prior command in a hex editor
and search for, e.g., the modulus, I cannot find it. In brief,
the hexadecimal representation and the binary representation do
converge.
Thus, I conclude that there is some format in place, respectively
how do I know where a bignum starts and where it ends?
I tried to find a clue by browsing the sources, but I gave up
confused by all the asn1 parse and nested bio print functions.
Can some one please put me into the right direction? I appreciate
help and comments!
-Armin
ps: My custom rsa library is built on gmp, so I want to convert the
binary data to the mpz_t type later on.
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