How to check if a RSA key file is valid

How to check if a RSA key file is valid

Answer:

If you have a RSA key file "test.pem" and want to know if it is a valid RSA key, you can perform a quick check

# openssl rsa -in test.pem -check
unable to load Private Key
21315:error:0906D064:PEM routines:PEM_read_bio:bad base64 decode:/SourceCache/OpenSSL098/OpenSSL098-44/src/crypto/pem/pem_lib.c:763:

If it is valid, you will find

# openssl rsa -in test.pem -check
RSA key ok