openssl_pkey_get_private returning false for one key

I am having two keys. For one it is working completely fine and giving the response as resource(368) of type (OpenSSL key) but for the other key it is just returning a false.

In both the cases I am not providing the path, but instead the string itself.

The key in which its working is like this :

-----BEGIN RSA PRIVATE KEY-----
MIIJKAIBAAKCAgEA74waKCtYqw7U7gE93BCn0CPmulFd1K8AaJqqBjOLe//okAuA
<...........................................................>
MGgCk1mrd65nf6JWsxb3RVcQ7jYxyFs3Pr4LFcgn1K0aTLnlwarBFjt+J3Y=
-----END RSA PRIVATE KEY-----

And the key in which it is not working is like this :

-----BEGIN RSA PRIVATE KEY-----
Proc-Type: 4,ENCRYPTED
DEK-Info: AES-128-CBC,14CA8(removing some values)2B6244

LwBvVX6TbdS9XYg0xywoLbhiaYK5UE6SQnATXJ8fXfJit+F4XcOfmWyQn+UsJRnM
<...........................................................>
s8M/Fe7YpkORsGSzQ6f5YslfmbmCsdCFDiBnTaIe45NP8IBULWY/vm45bYFteKUs
-----END RSA PRIVATE KEY-----

PS : I have hidden most part of keys for security.

Is there anything about the keys value also that affects the openssl to throw an error?

CODE :

$pkey = openssl_pkey_get_private(my_private_key_in_string_form);

EDIT :

What I on my research could find is that the second key is in an encrypted form whereas the first one is in the raw form. But I am yet not able to find how to convert this encrypted private key to its raw form from an already created key.

Solution

Looking at the keys, the one which works is not protected with passpharase, the one that you say fails is protected with passpharase, also the call to openssl_pkey_get_private() , does not have second optional parameter for passpharese. I am referring the dcumentation from https://www.php.net/manual/en/function.openssl-pkey-get-private.php

So if your private key is encrypted, you have to specify the passpharase so that the key can be read properly by the openssl_pkey_get_private() API