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//package ecc provides helpers for creating elliptic curve leys
package ecc
import (
"math/big"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/x509"
"encoding/pem"
"errors"
)
// ReadPublic loads ecdsa.PublicKey from given PKCS1 X509 or PKIX blobs
func ReadPublic(raw []byte) (key *ecdsa.PublicKey,err error) {
var encoded *pem.Block
if encoded, _ = pem.Decode(raw); encoded == nil {
return nil, errors.New("Ecc.ReadPublic(): Key must be PEM encoded PKCS1 X509 certificate or PKIX EC public key")
}
var parsedKey interface{}
var cert *x509.Certificate
if parsedKey, err = x509.ParsePKIXPublicKey(encoded.Bytes); err != nil {
if cert,err = x509.ParseCertificate(encoded.Bytes);err!=nil {
return nil, err
}
parsedKey=cert.PublicKey
}
var ok bool
if key, ok = parsedKey.(*ecdsa.PublicKey); !ok {
return nil, errors.New("Ecc.ReadPublic(): Key is not a valid *ecdsa.PublicKey")
}
return key, nil
}
// ReadPrivate loads ecdsa.PrivateKey from given PKCS1 or PKCS8 blobs
func ReadPrivate(raw []byte) (key *ecdsa.PrivateKey,err error) {
var encoded *pem.Block
if encoded, _ = pem.Decode(raw); encoded == nil {
return nil, errors.New("Ecc.ReadPrivate(): Key must be PEM encoded PKCS1 or PKCS8 EC private key")
}
var parsedKey interface{}
if parsedKey,err=x509.ParseECPrivateKey(encoded.Bytes);err!=nil {
if parsedKey, err = x509.ParsePKCS8PrivateKey(encoded.Bytes);err!=nil {
return nil,err
}
}
var ok bool
if key,ok=parsedKey.(*ecdsa.PrivateKey);!ok {
return nil, errors.New("Ecc.ReadPrivate(): Key is not valid *ecdsa.PrivateKey")
}
return key,nil
}
// NewPublic constructs ecdsa.PublicKey from given (X,Y)
func NewPublic(x,y []byte) (*ecdsa.PublicKey) {
return &ecdsa.PublicKey{ Curve: curve(len(x)),
X:new(big.Int).SetBytes(x),
Y:new(big.Int).SetBytes(y) }
}
// NewPrivate constructs ecdsa.PrivateKey from given (X,Y) and D
func NewPrivate(x,y,d []byte) (*ecdsa.PrivateKey) {
return &ecdsa.PrivateKey {D:new(big.Int).SetBytes(d),
PublicKey: ecdsa.PublicKey{ Curve:curve(len(x)),
X:new(big.Int).SetBytes(x),
Y:new(big.Int).SetBytes(y)}}
}
func curve(size int) (elliptic.Curve) {
switch size {
case 32: return elliptic.P256()
case 48: return elliptic.P384()
case 65,66: return elliptic.P521() //adjust for P-521 curve, which can be 65 or 66 bytes
default: return nil //unsupported curve
}
}
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