go-http-peering/crypto/pem.go

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package crypto
import (
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"crypto"
"crypto/rand"
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"crypto/rsa"
"crypto/x509"
"encoding/pem"
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"errors"
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jwt "github.com/dgrijalva/jwt-go"
)
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func EncodePublicKeyToPEM(key crypto.PublicKey) ([]byte, error) {
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pub, err := x509.MarshalPKIXPublicKey(key)
if err != nil {
return nil, err
}
data := pem.EncodeToMemory(&pem.Block{
Type: "PUBLIC KEY",
Bytes: pub,
})
return data, nil
}
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func DecodePEMToPublicKey(pem []byte) (crypto.PublicKey, error) {
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return jwt.ParseRSAPublicKeyFromPEM(pem)
}
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func DecodePEMEncryptedPrivateKey(key []byte, passphrase []byte) (*rsa.PrivateKey, error) {
var err error
// Parse PEM block
var block *pem.Block
if block, _ = pem.Decode(key); block == nil {
return nil, errors.New("invalid PEM block")
}
decryptedBlock, err := x509.DecryptPEMBlock(block, passphrase)
if err != nil {
return nil, err
}
var parsedKey interface{}
if parsedKey, err = x509.ParsePKCS1PrivateKey(decryptedBlock); err != nil {
return nil, err
}
var privateKey *rsa.PrivateKey
var ok bool
if privateKey, ok = parsedKey.(*rsa.PrivateKey); !ok {
return nil, errors.New("invalid RSA private key")
}
return privateKey, nil
}
func EncodePrivateKeyToEncryptedPEM(key *rsa.PrivateKey, passphrase []byte) ([]byte, error) {
if passphrase == nil {
return nil, errors.New("passphrase cannot be empty")
}
block := &pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(key),
}
block, err := x509.EncryptPEMBlock(
rand.Reader, block.Type,
block.Bytes, passphrase, x509.PEMCipherAES256,
)
if err != nil {
return nil, err
}
return pem.EncodeToMemory(block), nil
}