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It turns out the JDK implementation (`SunEC` provider) of Ed25519 signature verification is quite slow, slower than the abandoned library (i2p) it replaced. This has been replaced by Bouncy Castle, whereby the `EDDSA_ED25519_SHA512` signature scheme uses it. `SunEC` still remains the default implementation. `Crypto.toSupportedPublicKey` (and `toSupportedPrivateKey`) were tweaked to make sure any `SunEC` keys are converted to Bouncy Castle. The presence of two different `EdECPublicKey` implementations for the same key causes cache misses in `BasicHSMKeyManagementService`, resulting in another performance degradation. |
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