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|
package crypto
import (
"bytes"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/x509"
"encoding/pem"
"fmt"
)
// Curves -
func Curves(c string) (elliptic.Curve, bool) {
switch c {
case "P224":
return elliptic.P224(), true
case "P256":
return elliptic.P256(), true
case "P384":
return elliptic.P384(), true
case "P521":
return elliptic.P521(), true
default:
return nil, false
}
}
// ECDSAGenerateKey -
func ECDSAGenerateKey(curve elliptic.Curve) ([]byte, error) {
priv, err := ecdsa.GenerateKey(curve, rand.Reader)
if err != nil {
return nil, fmt.Errorf("failed to generate ECDSA private key: %w", err)
}
der, err := x509.MarshalECPrivateKey(priv)
if err != nil {
return nil, fmt.Errorf("failed to marshal ECDSA private key: %w", err)
}
block := &pem.Block{
Type: "EC PRIVATE KEY",
Bytes: der,
}
buf := &bytes.Buffer{}
err = pem.Encode(buf, block)
if err != nil {
return nil, fmt.Errorf("failed to encode generated ECDSA private key: pem encoding failed: %w", err)
}
return buf.Bytes(), nil
}
// ECDSADerivePublicKey -
func ECDSADerivePublicKey(privatekey []byte) ([]byte, error) {
block, _ := pem.Decode(privatekey)
if block == nil {
return nil, fmt.Errorf("failed to read key: no key found")
}
priv, err := x509.ParseECPrivateKey(block.Bytes)
if err != nil {
return nil, fmt.Errorf("invalid private key: %w", err)
}
b, err := x509.MarshalPKIXPublicKey(&priv.PublicKey)
if err != nil {
return nil, fmt.Errorf("failed to marshal PKIX public key: %w", err)
}
block = &pem.Block{
Type: "PUBLIC KEY",
Bytes: b,
}
return pem.EncodeToMemory(block), nil
}
|
