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// Package ecc implements a generic interface for ECDH, ECDSA, and EdDSA.
package ecc
import (
"bytes"
"crypto/elliptic"
"github.com/ProtonMail/go-crypto/bitcurves"
"github.com/ProtonMail/go-crypto/brainpool"
"github.com/ProtonMail/go-crypto/openpgp/internal/encoding"
)
const Curve25519GenName = "Curve25519"
type CurveInfo struct {
GenName string
Oid *encoding.OID
Curve Curve
}
var Curves = []CurveInfo{
{
// NIST P-256
GenName: "P256",
Oid: encoding.NewOID([]byte{0x2A, 0x86, 0x48, 0xCE, 0x3D, 0x03, 0x01, 0x07}),
Curve: NewGenericCurve(elliptic.P256()),
},
{
// NIST P-384
GenName: "P384",
Oid: encoding.NewOID([]byte{0x2B, 0x81, 0x04, 0x00, 0x22}),
Curve: NewGenericCurve(elliptic.P384()),
},
{
// NIST P-521
GenName: "P521",
Oid: encoding.NewOID([]byte{0x2B, 0x81, 0x04, 0x00, 0x23}),
Curve: NewGenericCurve(elliptic.P521()),
},
{
// SecP256k1
GenName: "SecP256k1",
Oid: encoding.NewOID([]byte{0x2B, 0x81, 0x04, 0x00, 0x0A}),
Curve: NewGenericCurve(bitcurves.S256()),
},
{
// Curve25519
GenName: Curve25519GenName,
Oid: encoding.NewOID([]byte{0x2B, 0x06, 0x01, 0x04, 0x01, 0x97, 0x55, 0x01, 0x05, 0x01}),
Curve: NewCurve25519(),
},
{
// x448
GenName: "Curve448",
Oid: encoding.NewOID([]byte{0x2B, 0x65, 0x6F}),
Curve: NewX448(),
},
{
// Ed25519
GenName: Curve25519GenName,
Oid: encoding.NewOID([]byte{0x2B, 0x06, 0x01, 0x04, 0x01, 0xDA, 0x47, 0x0F, 0x01}),
Curve: NewEd25519(),
},
{
// Ed448
GenName: "Curve448",
Oid: encoding.NewOID([]byte{0x2B, 0x65, 0x71}),
Curve: NewEd448(),
},
{
// BrainpoolP256r1
GenName: "BrainpoolP256",
Oid: encoding.NewOID([]byte{0x2B, 0x24, 0x03, 0x03, 0x02, 0x08, 0x01, 0x01, 0x07}),
Curve: NewGenericCurve(brainpool.P256r1()),
},
{
// BrainpoolP384r1
GenName: "BrainpoolP384",
Oid: encoding.NewOID([]byte{0x2B, 0x24, 0x03, 0x03, 0x02, 0x08, 0x01, 0x01, 0x0B}),
Curve: NewGenericCurve(brainpool.P384r1()),
},
{
// BrainpoolP512r1
GenName: "BrainpoolP512",
Oid: encoding.NewOID([]byte{0x2B, 0x24, 0x03, 0x03, 0x02, 0x08, 0x01, 0x01, 0x0D}),
Curve: NewGenericCurve(brainpool.P512r1()),
},
}
func FindByCurve(curve Curve) *CurveInfo {
for _, curveInfo := range Curves {
if curveInfo.Curve.GetCurveName() == curve.GetCurveName() {
return &curveInfo
}
}
return nil
}
func FindByOid(oid encoding.Field) *CurveInfo {
var rawBytes = oid.Bytes()
for _, curveInfo := range Curves {
if bytes.Equal(curveInfo.Oid.Bytes(), rawBytes) {
return &curveInfo
}
}
return nil
}
func FindEdDSAByGenName(curveGenName string) EdDSACurve {
for _, curveInfo := range Curves {
if curveInfo.GenName == curveGenName {
curve, ok := curveInfo.Curve.(EdDSACurve)
if ok {
return curve
}
}
}
return nil
}
func FindECDSAByGenName(curveGenName string) ECDSACurve {
for _, curveInfo := range Curves {
if curveInfo.GenName == curveGenName {
curve, ok := curveInfo.Curve.(ECDSACurve)
if ok {
return curve
}
}
}
return nil
}
func FindECDHByGenName(curveGenName string) ECDHCurve {
for _, curveInfo := range Curves {
if curveInfo.GenName == curveGenName {
curve, ok := curveInfo.Curve.(ECDHCurve)
if ok {
return curve
}
}
}
return nil
}
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