Testing self-generated RSA public key in OpenSSL

Question

I've generated a PKCS#1 RSA keypair using a program I wrote. I've output public key as DER encoding of the RSAPublicKey ASN.1 SEQUENCE data structure.

However, when I try to use it in the OpenSSL pkeyutl and rsautl commands, OpenSSL says

unable to load Public Key

I've tried both DER and PEM formats.

Is there additional encoding and/or data structure that I must apply for it to be usable in OpenSSL?

Here's my command line:

openssl pkeyutl -encrypt -pubin -in 128-bit.dat -inkey rsa-1440-pub.pem

openssl rsautl -in 128-bit.dat -encrypt -keyform PEM -pubin -inkey rsa-1440-pub.pem

The public key data structure in PEM format

DannyNiu · Accepted Answer · 2021-07-29 10:15:24Z

0

For a public key to be accepted by OpenSSL, it appears that you need to wrap it in a SubjectPublicKeyInfo data structure. Like this:

answered Jul 29, 2021 at 10:15

DannyNiu

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