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The current "ed25519" signing type assumes raw Ed25519 key format for both public and private keys. That requires custom processing of keys after generated with openssl tools, and also lacks cryptographic agility[1]; when Ed25519 becomes vulnerable, it would not be straightforward to migrate to other algorithms, such as post-quantum signature algorithms. This patch adds a new signature type "x509" to use the key formats natively supported by OpenSSL (PKCS#8 and SubjectPublicKeyInfo) and capable of embedding algorithm identifier in an X.509 format. The "x509" signature type prefers keys to be encoded in the PEM format on disk, while it still accepts base64 encoded keys when given through the command-line. 1. https://en.wikipedia.org/wiki/Cryptographic_agility Signed-off-by: Daiki Ueno <[email protected]>
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