ReadMe
						======

Compiling:
==========

make clean
make

Execution:
==========

Generate Ceritifcates:
----------------------
./rsaengine -genrsa -pubout public_key.der -privout priv_key.der

Encryption:
-----------

./rsaengine -encrypt -pubin public_key.der -in message -out encrypted_message
	
	OpenSSL decryption:
	-------------------
	openssl rsautl -decrypt -inkey priv_key.der -keyform der -in encrypted_message -out decrypted_msg
	vimdiff message decrypted_msg

Decryption:
-----------

	OpenSSL encryption:
	-------------------
 	openssl rsautl -encrypt -inkey public_key.der -pubin -keyform der -in message -out encrypted_message


./rsaengine -decrypt -privin priv_key.der -in encrypted_message -out decrypted_msg
vimdiff message decrypted_msg

Sign:
-----

./rsaengine -sign -privin priv_key.der -in message -out signature_file -certout public_certificate.der

	OpenSSL Verification:
	--------------------
	openssl dgst -md5 -verify public_key.der -keyform der -signature signature_file message


Verify:
-------

	OpenSSL Signature:
	------------------
	openssl dgst -md5 -sign priv_key.der -keyform der -out signature_file message

./rsaengine -verify -signature signature_file -certin public_certificate.der -in message

Parse:
------

./rsaengine -asn1parse der_file 

Convert to PEM:
---------------

./rsaengine -convert -in file.der -type pub/priv/certi -out file.pem


Avijit Gupta
108287277