Fix genPublicEphemeralKey and genPrivateEphemeralKey for new OpenPGP.js (#79)
Fix genPublicEphemeralKey and genPrivateEphemeralKey for new OpenPGP.js (#79)

They would strip leading zeros in the shared key before the KDF,
causing broken key exchange in 1/256 cases.

Broken in https://github.com/openpgpjs/openpgpjs/commit/e637e758916c10a47fbf6709a53099368a0cb9e3#diff-393134c8f16100b74cb2c2495b62fe8a
ProtonMail/pmcrypto,ProtonMail/pmcrypto