[gnutls-devel] GnuTLS | Ed448 keys are indicated as having a 456-bit "security level" (#1231)

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Daniel Kahn Gillmor created an issue: https://gitlab.com/gnutls/gnutls/-/issues/1231



It's not clear why a curve448 key might claim to have 456 bits of "security":

```
0 dkg at alice:~$ certtool --generate-privkey --key-type ed448
Generating a 256 bit EdDSA (Ed448) private key ...
Public Key Info:
	Public Key Algorithm: EdDSA (Ed448)
	Key Security Level: Ultra (456 bits)

curve:	Ed448
…
```

I think this should be 448 bits.  (i know that "security levels" in the Ultra range are basically indistinguishable in their overwhelming strength, but this is still a bit of an odd mismatch)

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