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parse.go
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parse.go
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package ecdh
import (
"errors"
"crypto"
"crypto/x509"
"crypto/ecdh"
"crypto/ecdsa"
"encoding/pem"
cryptobin_ecdh "github.com/deatil/go-cryptobin/ecdh"
cryptobin_pkcs8s "github.com/deatil/go-cryptobin/pkcs8s"
)
var (
ErrKeyMustBePEMEncoded = errors.New("invalid key: Key must be a PEM encoded PKCS1 or PKCS8 key")
ErrNotPrivateKey = errors.New("key is not a valid ecdh private key")
ErrNotPublicKey = errors.New("key is not a valid ecdh public key")
)
// 解析私钥
func (this Ecdh) ParsePrivateKeyFromPEM(key []byte) (crypto.PrivateKey, error) {
var err error
// Parse PEM block
var block *pem.Block
if block, _ = pem.Decode(key); block == nil {
return nil, ErrKeyMustBePEMEncoded
}
// Parse the key
var parsedKey any
if parsedKey, err = x509.ParsePKCS8PrivateKey(block.Bytes); err != nil {
return nil, err
}
switch pkey := parsedKey.(type) {
case *ecdh.PrivateKey:
return pkey, nil
case *ecdsa.PrivateKey:
priKey, err := pkey.ECDH()
if err != nil {
return nil, err
}
return priKey, nil
}
return nil, ErrNotPrivateKey
}
// 解析私钥带密码
func (this Ecdh) ParsePrivateKeyFromPEMWithPassword(key []byte, password string) (crypto.PrivateKey, error) {
var err error
// Parse PEM block
var block *pem.Block
if block, _ = pem.Decode(key); block == nil {
return nil, ErrKeyMustBePEMEncoded
}
var blockDecrypted []byte
if blockDecrypted, err = cryptobin_pkcs8s.DecryptPEMBlock(block, []byte(password)); err != nil {
return nil, err
}
var parsedKey any
if parsedKey, err = x509.ParsePKCS8PrivateKey(blockDecrypted); err != nil {
return nil, err
}
switch pkey := parsedKey.(type) {
case *ecdh.PrivateKey:
return pkey, nil
case *ecdsa.PrivateKey:
priKey, err := pkey.ECDH()
if err != nil {
return nil, err
}
return priKey, nil
}
return nil, ErrNotPrivateKey
}
// 解析公钥
func (this Ecdh) ParsePublicKeyFromPEM(key []byte) (crypto.PublicKey, error) {
var err error
// Parse PEM block
var block *pem.Block
if block, _ = pem.Decode(key); block == nil {
return nil, ErrKeyMustBePEMEncoded
}
// Parse the key
var parsedKey any
if parsedKey, err = x509.ParsePKIXPublicKey(block.Bytes); err != nil {
if cert, err := x509.ParseCertificate(block.Bytes); err == nil {
parsedKey = cert.PublicKey
} else {
return nil, err
}
}
switch pkey := parsedKey.(type) {
case *ecdh.PublicKey:
return pkey, nil
case *ecdsa.PublicKey:
pubKey, err := pkey.ECDH()
if err != nil {
return nil, err
}
return pubKey, nil
}
return nil, ErrNotPublicKey
}
// ==========================================
// 解析私钥
func (this Ecdh) ParseECDHPrivateKeyFromPEM(key []byte) (crypto.PrivateKey, error) {
var err error
// Parse PEM block
var block *pem.Block
if block, _ = pem.Decode(key); block == nil {
return nil, ErrKeyMustBePEMEncoded
}
// Parse the key
var parsedKey any
if parsedKey, err = cryptobin_ecdh.ParsePrivateKey(block.Bytes); err != nil {
return nil, err
}
var pkey *ecdh.PrivateKey
var ok bool
if pkey, ok = parsedKey.(*ecdh.PrivateKey); !ok {
return nil, ErrNotPrivateKey
}
return pkey, nil
}
// 解析私钥带密码
func (this Ecdh) ParseECDHPrivateKeyFromPEMWithPassword(key []byte, password string) (crypto.PrivateKey, error) {
var err error
// Parse PEM block
var block *pem.Block
if block, _ = pem.Decode(key); block == nil {
return nil, ErrKeyMustBePEMEncoded
}
var blockDecrypted []byte
if blockDecrypted, err = cryptobin_pkcs8s.DecryptPEMBlock(block, []byte(password)); err != nil {
return nil, err
}
var parsedKey any
if parsedKey, err = cryptobin_ecdh.ParsePrivateKey(blockDecrypted); err != nil {
return nil, err
}
var pkey *ecdh.PrivateKey
var ok bool
if pkey, ok = parsedKey.(*ecdh.PrivateKey); !ok {
return nil, ErrNotPrivateKey
}
return pkey, nil
}
// 解析公钥
func (this Ecdh) ParseECDHPublicKeyFromPEM(key []byte) (crypto.PublicKey, error) {
var err error
// Parse PEM block
var block *pem.Block
if block, _ = pem.Decode(key); block == nil {
return nil, ErrKeyMustBePEMEncoded
}
// Parse the key
var parsedKey any
if parsedKey, err = cryptobin_ecdh.ParsePublicKey(block.Bytes); err != nil {
return nil, err
}
var pkey *ecdh.PublicKey
var ok bool
if pkey, ok = parsedKey.(*ecdh.PublicKey); !ok {
return nil, ErrNotPublicKey
}
return pkey, nil
}