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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. 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, while the support for the original key format is preserved for backward compatibility. As a PoC of the feature, this adds a couple of new tests using Ed448, instead of Ed25519, in tests/test-signed-commit.sh. 1. https://en.wikipedia.org/wiki/Cryptographic_agility Signed-off-by: Daiki Ueno <[email protected]>
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