Description:
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there is a way to export private keys into strings, but there isn't a way to do the same with public keys. it seems like a workaround that i should create a certificate and sign it, and it's the only way openssl_pkey_get_public works. isn't there a standard way to export only public keys in PEM format?

i know openssl_sign is experimental, but maybe this helps: it only outputs binary data, maybe there's again a standard way to make base64-like signatures.