RSA hexadecimal parameters



I'm looking for the 3 parameters for the RSA algorithm in hexadecimal:
the module and two exponents.
I would like to use RSA with about 512 bit.
It is better a little number for the decrypt exponent to decrypt fast.
The RSA I have use hexadecimal strings and keys.
It is ok also to find decimal parameters, but after that I must
convert big numbers into hexadecimal and I don't find a correct
converter.
.


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