use libsodium for ed25519

use libsodium for ed25519

Testing algorithm 250: 'Ref10 ED25519' ->'Ref10 ED25519' -> 'Ref10 ED25519' Signature & verify ok, signature 164usec, verify 400usec
Testing algorithm 250: 'Ref10 ED25519' ->'Ref10 ED25519' -> 'Sodium' Signature & verify ok, signature 169usec, verify 165usec
Testing algorithm 250: 'Ref10 ED25519' ->'Sodium' -> 'Ref10 ED25519' Signature & verify ok, signature 62usec, verify 407usec
Testing algorithm 250: 'Ref10 ED25519' ->'Sodium' -> 'Sodium' Signature & verify ok, signature 62usec, verify 149usec
Testing algorithm 250: 'Sodium' ->'Ref10 ED25519' -> 'Ref10 ED25519' Signature & verify ok, signature 162usec, verify 397usec
Testing algorithm 250: 'Sodium' ->'Ref10 ED25519' -> 'Sodium' Signature & verify ok, signature 161usec, verify 149usec
Testing algorithm 250: 'Sodium' ->'Sodium' -> 'Ref10 ED25519' Signature & verify ok, signature 61usec, verify 394usec
Testing algorithm 250: 'Sodium' ->'Sodium' -> 'Sodium' Signature & verify ok, signature 60usec, verify 150usec