Problems loading a private key with passphrase encoding is AES-256-CFB

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1

Hi all,

I’m having a problem decoding a RSA private key that has a passphrase encoded with a AES-256-CFB algorithm.

-----BEGIN RSA PRIVATE KEY-----\nProc-Type: 4,ENCRYPTED\nDEK-Info: AES-256-CFB,18081AC64126A5F3C5B67111851B04F5

It doesn’t look like the standard Erlang public_key lib supports AES-256-CFB. Are there any other libraries out there that may support this?

Thanks,
Jeramy

2

No, it does not support CFB mode for encrypted PEM files. Your best bet is to convert the file to use CBC mode instead:

openssl rsa -in key_cfb.pem -aes256 -out key_cbc.pem

You’ll have to type the key’s passphrase three times, and then you should be able to work with the output file using :public_key's functions.

1 Like
3

Unfortunately converting it isn’t an option. I’ve already written a nif using Rustler to get the functionality I need.