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// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package subtle
import (
"crypto/ed25519"
"fmt"
)
// ED25519Signer is an implementation of Signer for ED25519.
type ED25519Signer struct {
privateKey *ed25519.PrivateKey
}
// NewED25519Signer creates a new instance of ED25519Signer.
func NewED25519Signer(keyValue []byte) (*ED25519Signer, error) {
if len(keyValue) != ed25519.SeedSize {
return nil, fmt.Errorf("ed25519: invalid key length %d, want %d", len(keyValue), ed25519.SeedSize)
}
p := ed25519.NewKeyFromSeed(keyValue)
return NewED25519SignerFromPrivateKey(&p)
}
// NewED25519SignerFromPrivateKey creates a new instance of ED25519Signer
func NewED25519SignerFromPrivateKey(privateKey *ed25519.PrivateKey) (*ED25519Signer, error) {
return &ED25519Signer{
privateKey: privateKey,
}, nil
}
// Sign computes a signature for the given data.
func (e *ED25519Signer) Sign(data []byte) ([]byte, error) {
r := ed25519.Sign(*e.privateKey, data)
if len(r) != ed25519.SignatureSize {
return nil, errInvalidED25519Signature
}
return r, nil
}
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