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publickey.go
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publickey.go
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/*
* Copyright (C) 2015-2018 Virgil Security Inc.
*
* Lead Maintainer: Virgil Security Inc. <support@virgilsecurity.com>
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* (1) Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* (2) Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* (3) Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ''AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*/
package cryptoimpl
import (
"encoding/asn1"
"encoding/pem"
"golang.org/x/crypto/ed25519"
)
type ed25519PublicKey struct {
ID []byte
key []byte
}
func DecodePublicKey(keyBytes []byte) (*ed25519PublicKey, error) {
unwrappedKey, keyType, err := unwrapKey(keyBytes)
if err != nil {
return nil, err
}
if keyType != "" && keyType != PUBLIC_KEY {
return nil, unsupported("key type")
}
publicKey := &publicKey{}
_, err = asn1.Unmarshal(unwrappedKey, publicKey)
if err != nil {
return nil, CryptoError("invalid data")
}
err = publicKey.Validate()
if err != nil {
return nil, err
}
key := publicKey.Key.Bytes
edPublicKey := &ed25519PublicKey{key: key}
snapshot, err := edPublicKey.Encode()
if err != nil {
return nil, err
}
edPublicKey.ID = calculateSHA512BasedIdentifier(snapshot)
return edPublicKey, nil
}
func (k *ed25519PublicKey) contents() []byte {
return k.key
}
func (k *ed25519PublicKey) Identifier() []byte {
return k.ID
}
func (k *ed25519PublicKey) Encode() ([]byte, error) {
encodeToPem := false
if len(k.key) != ed25519.PublicKeySize {
return nil, unsupported("key size")
}
key := publicKey{}
key.Algorithm = algorithmIdentifierWithOidParameter{Algorithm: oidEd25519key}
key.Key = asn1.BitString{Bytes: k.key}
rawKey, err := asn1.Marshal(key)
if err != nil {
return nil, cryptoError(err, "")
}
if !encodeToPem {
return rawKey, nil
} else {
block := &pem.Block{
Type: PUBLIC_KEY,
Bytes: rawKey,
}
return pem.EncodeToMemory(block), nil
}
}
func (k *ed25519PublicKey) Empty() bool {
return k == nil || len(k.key) == 0
}
func (k *ed25519PublicKey) IsPublic() bool {
return true
}