ianjoneill commented on PR #639:
URL: https://github.com/apache/mina-sshd/pull/639#issuecomment-2498158992
If you're running on e.g. Java 21 without BC or `net2.i2p.crypto`, it errors
out forcing the use any EdDSA/Ed25519 functionality.
e.g. if you configure mina in client mode to only support connecting with
`ssh-ed25519`, it will error out with:
```
Caused by: java.security.NoSuchAlgorithmException: EdDSA provider not
supported
at
org.apache.sshd.common.util.security.SecurityUtils.generateEDDSAPublicKey(SecurityUtils.java:722)
at
org.apache.sshd.common.util.buffer.keys.ED25519BufferPublicKeyParser.getRawPublicKey(ED25519BufferPublicKeyParser.java:46)
at
org.apache.sshd.common.util.buffer.keys.BufferPublicKeyParser$2.getRawPublicKey(BufferPublicKeyParser.java:102)
at
org.apache.sshd.common.util.buffer.Buffer.getRawPublicKey(Buffer.java:573)
```
Due to there being no `SecurityProviderRegistrar` available that provides an
`EdDSASupport` implementation.
If you don't specify the signatures when building the mina client, it won't
propose `ssh-ed25519` - again because there is no applicable `EdDSASupport`
implementation.
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