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