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I have a private key file which is in binary format. I need to convert it into .pem format. I am able to convert using base64 but openssl is not accepting this file. Is there any other way to convert binary to .pem which is acceptable by openssl.

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There are 2.7 billion different binary formats for private key files. –  GregS Dec 21 '13 at 13:14
Please add information about the precise binary format and your programming environment, or it is impossible to answer this question. –  owlstead Dec 21 '13 at 14:24
@GregS As your comment is now 14 hours old, is is out of date. The current number is 2.9 billion. –  Jumbogram Dec 22 '13 at 3:58
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up vote 2 down vote accepted

Chances are you have a DER encoded key. To convert it you can (likely) do this

openssl rsa -inform der -in <yourfile> -outform pem -out output.pem

Please note that this will only work for unencrypted RSA private keys. If you have a DSA or EC (or PKCS8 formatted) key you'll need to change the command a bit, but you did not provide enough detail for me to narrow it down for you.

(There are also many other private key formats such as PVK, so if this still doesn't work please provide some more information)

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