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Compatibility with standards and other software
==================================================
.. index:: OpenSSL
.. index:: compatibility
Python-RSA implements encryption and signatures according to PKCS#1
version 1.5. This makes it compatible with the OpenSSL RSA module.
Keys are stored in PEM or DER format according to PKCS#1 v1.5. Private
keys are compatible with OpenSSL. However, OpenSSL uses X.509 for its
public keys, which are not supported.
Encryption:
PKCS#1 v1.5 with at least 8 bytes of random padding
Signatures:
PKCS#1 v1.5 using the following hash methods:
MD5, SHA-1, SHA-256, SHA-384, SHA-512
Private keys:
PKCS#1 v1.5 in PEM and DER format, ASN.1 type RSAPrivateKey
Public keys:
PKCS#1 v1.5 in PEM and DER format, ASN.1 type RSAPublicKey
:ref:`VARBLOCK <bigfiles>` encryption:
Python-RSA only, not compatible with any other known application.
Public keys from OpenSSL
--------------------------------------------------
To get a Python-RSA-compatible public key from OpenSSL, you need the
private key. Get the private key in PEM or DER format and run it
through the ``pyrsa-priv2pub`` command::
Usage: pyrsa-priv2pub [options]
Reads a private key and outputs the corresponding public key. Both
private and public keys use the format described in PKCS#1 v1.5
Options:
-h, --help show this help message and exit
--in=INFILENAME Input filename. Reads from stdin if not specified
--out=OUTFILENAME Output filename. Writes to stdout of not specified
--inform=INFORM key format of input - default PEM
--outform=OUTFORM key format of output - default PEM
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