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ecdsa.go
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ecdsa.go
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package encryption
import (
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/x509"
"encoding/base64"
"encoding/pem"
)
type ECDSAHelper struct{}
func (h ECDSAHelper) Encode(privateKey *ecdsa.PrivateKey, publicKey *ecdsa.PublicKey) (string, string) {
x509Encoded, _ := x509.MarshalECPrivateKey(privateKey)
pemEncoded := pem.EncodeToMemory(&pem.Block{Type: "PRIVATE KEY", Bytes: x509Encoded})
x509EncodedPub, _ := x509.MarshalPKIXPublicKey(publicKey)
pemEncodedPub := pem.EncodeToMemory(&pem.Block{Type: "PUBLIC KEY", Bytes: x509EncodedPub})
return string(pemEncoded), string(pemEncodedPub)
}
func (h ECDSAHelper) Decode(pemEncoded string, pemEncodedPub string) (*ecdsa.PrivateKey, *ecdsa.PublicKey) {
block, _ := pem.Decode([]byte(pemEncoded))
x509Encoded := block.Bytes
privateKey, err := x509.ParseECPrivateKey(x509Encoded)
if err != nil {
println(err.Error())
}
blockPub, _ := pem.Decode([]byte(pemEncodedPub))
x509EncodedPub := blockPub.Bytes
genericPublicKey, err := x509.ParsePKIXPublicKey(x509EncodedPub)
if err != nil {
println(err.Error())
}
publicKey := genericPublicKey.(*ecdsa.PublicKey)
return privateKey, publicKey
}
func (h ECDSAHelper) DecodePrivateKeyFromPem(pemEncoded string) *ecdsa.PrivateKey {
block, _ := pem.Decode([]byte(pemEncoded))
x509Encoded := block.Bytes
privateKey, err := x509.ParseECPrivateKey(x509Encoded)
if err != nil {
logger.Error("There was an error decoding the private key from pem: %v", err.Error())
return nil
}
return privateKey
}
func (h ECDSAHelper) DecodePublicKeyFromPem(pemEncoded string) *ecdsa.PublicKey {
block, _ := pem.Decode([]byte(pemEncoded))
x509Encoded := block.Bytes
genericPublicKey, err := x509.ParsePKIXPublicKey(x509Encoded)
if err != nil {
logger.Error("There was an error decoding the private key from pem: %v", err.Error())
return nil
}
publicKey := genericPublicKey.(*ecdsa.PublicKey)
return publicKey
}
func (h ECDSAHelper) DecodePrivateKeyFromBase64(bas64Encoded string) *ecdsa.PrivateKey {
x509Encoded, err := base64.URLEncoding.DecodeString(bas64Encoded)
if err != nil {
logger.Error("There was an error decoding the private key from base64: %v", err.Error())
return nil
}
privateKey, err := x509.ParseECPrivateKey(x509Encoded)
if err != nil {
logger.Error("There was an error getting the private key from base64: %v", err.Error())
return nil
}
return privateKey
}
func (h ECDSAHelper) DecodePublicKeyFromBase64(bas64Encoded string) *ecdsa.PublicKey {
x509Encoded, err := base64.URLEncoding.DecodeString(bas64Encoded)
if err != nil {
logger.Error("There was an error decoding the private key from base64: %v", err.Error())
return nil
}
genericPublicKey, err := x509.ParsePKIXPublicKey(x509Encoded)
if err != nil {
logger.Error("There was an error getting the private key from base64: %v", err.Error())
return nil
}
publicKey := genericPublicKey.(*ecdsa.PublicKey)
return publicKey
}
func (h ECDSAHelper) DecodePrivateKeyFromBase64Pem(bas64Encoded string) *ecdsa.PrivateKey {
pemEncoded, err := base64.URLEncoding.DecodeString(bas64Encoded)
if err != nil {
logger.Error("There was an error decoding the private key from base64: %v", err.Error())
return nil
}
privateKey := h.DecodePrivateKeyFromPem(string(pemEncoded))
// privateKey, err := x509.ParseECPrivateKey(pemEncoded)
if privateKey == nil {
logger.Error("There was an error getting the private key from base64: %v", err.Error())
return nil
}
return privateKey
}
func (h ECDSAHelper) DecodePublicKeyFromBase64Pem(bas64Encoded string) *ecdsa.PublicKey {
pemEncoded, err := base64.URLEncoding.DecodeString(bas64Encoded)
if err != nil {
logger.Error("There was an error decoding the private key from base64: %v", err.Error())
return nil
}
privateKey := h.DecodePublicKeyFromPem(string(pemEncoded))
// privateKey, err := x509.ParseECPrivateKey(pemEncoded)
if privateKey == nil {
logger.Error("There was an error getting the private key from base64: %v", err.Error())
return nil
}
return privateKey
}
func (h ECDSAHelper) GeneratePrivateKey(size EncryptionKeySize) *ecdsa.PrivateKey {
if size > 512 {
size = Bit512
}
var priv *ecdsa.PrivateKey
var err error
switch size {
case Bit256:
priv, err = ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
case Bit384:
priv, err = ecdsa.GenerateKey(elliptic.P384(), rand.Reader)
case Bit512:
priv, err = ecdsa.GenerateKey(elliptic.P521(), rand.Reader)
default:
priv, err = ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
}
if err != nil {
return nil
}
return priv
}
func (h ECDSAHelper) GenerateKeys(size EncryptionKeySize) (*ecdsa.PrivateKey, *ecdsa.PublicKey) {
priv := h.GeneratePrivateKey(size)
if priv == nil {
return nil, nil
}
return priv, &priv.PublicKey
}