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package ed448
import (
"crypto/rand"
"encoding/asn1"
"github.com/cloudflare/circl/sign"
)
var sch sign.Scheme = &scheme{}
// Scheme returns a signature interface.
func Scheme() sign.Scheme { return sch }
type scheme struct{}
func (*scheme) Name() string { return "Ed448" }
func (*scheme) PublicKeySize() int { return PublicKeySize }
func (*scheme) PrivateKeySize() int { return PrivateKeySize }
func (*scheme) SignatureSize() int { return SignatureSize }
func (*scheme) SeedSize() int { return SeedSize }
func (*scheme) TLSIdentifier() uint { return 0x0808 }
func (*scheme) SupportsContext() bool { return true }
func (*scheme) Oid() asn1.ObjectIdentifier {
return asn1.ObjectIdentifier{1, 3, 101, 113}
}
func (*scheme) GenerateKey() (sign.PublicKey, sign.PrivateKey, error) {
return GenerateKey(rand.Reader)
}
func (*scheme) Sign(
sk sign.PrivateKey,
message []byte,
opts *sign.SignatureOpts,
) []byte {
priv, ok := sk.(PrivateKey)
if !ok {
panic(sign.ErrTypeMismatch)
}
ctx := ""
if opts != nil {
ctx = opts.Context
}
return Sign(priv, message, ctx)
}
func (*scheme) Verify(
pk sign.PublicKey,
message, signature []byte,
opts *sign.SignatureOpts,
) bool {
pub, ok := pk.(PublicKey)
if !ok {
panic(sign.ErrTypeMismatch)
}
ctx := ""
if opts != nil {
ctx = opts.Context
}
return Verify(pub, message, signature, ctx)
}
func (*scheme) DeriveKey(seed []byte) (sign.PublicKey, sign.PrivateKey) {
privateKey := NewKeyFromSeed(seed)
publicKey := make(PublicKey, PublicKeySize)
copy(publicKey, privateKey[SeedSize:])
return publicKey, privateKey
}
func (*scheme) UnmarshalBinaryPublicKey(buf []byte) (sign.PublicKey, error) {
if len(buf) < PublicKeySize {
return nil, sign.ErrPubKeySize
}
pub := make(PublicKey, PublicKeySize)
copy(pub, buf[:PublicKeySize])
return pub, nil
}
func (*scheme) UnmarshalBinaryPrivateKey(buf []byte) (sign.PrivateKey, error) {
if len(buf) < PrivateKeySize {
return nil, sign.ErrPrivKeySize
}
priv := make(PrivateKey, PrivateKeySize)
copy(priv, buf[:PrivateKeySize])
return priv, nil
}
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