88da5d44b1
* throw error EncryptSessionKey throw error if one of the keys in keyring does not have valid encryption key * add key id to error description
76 lines
1.9 KiB
Go
76 lines
1.9 KiB
Go
package crypto
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import (
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"bytes"
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"fmt"
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"strconv"
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"github.com/pkg/errors"
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"golang.org/x/crypto/openpgp/packet"
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)
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// DecryptSessionKey returns the decrypted session key from a binary encrypted session key packet.
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func (keyRing *KeyRing) DecryptSessionKey(keyPacket []byte) (*SessionKey, error) {
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keyReader := bytes.NewReader(keyPacket)
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packets := packet.NewReader(keyReader)
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var p packet.Packet
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var err error
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if p, err = packets.Next(); err != nil {
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return nil, err
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}
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ek := p.(*packet.EncryptedKey)
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var decryptErr error
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for _, key := range keyRing.entities.DecryptionKeys() {
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priv := key.PrivateKey
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if priv.Encrypted {
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continue
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}
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if decryptErr = ek.Decrypt(priv, nil); decryptErr == nil {
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break
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}
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}
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if decryptErr != nil {
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return nil, decryptErr
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}
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if ek == nil {
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return nil, errors.New("gopenpgp: unable to decrypt session key")
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}
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return newSessionKeyFromEncrypted(ek)
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}
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// EncryptSessionKey encrypts the session key with the unarmored
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// publicKey and returns a binary public-key encrypted session key packet.
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func (keyRing *KeyRing) EncryptSessionKey(sk *SessionKey) ([]byte, error) {
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outbuf := &bytes.Buffer{}
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cf, err := sk.GetCipherFunc()
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if err != nil {
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return nil, errors.Wrap(err, "gopenpgp: unable to encrypt session key")
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}
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pubKeys := make([]*packet.PublicKey, 0, len(keyRing.entities))
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for _, e := range keyRing.entities {
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encryptionKey, ok := e.EncryptionKey(getNow())
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if !ok {
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return nil, errors.New("gopenpgp: encryption key is unavailable for key id " + strconv.FormatUint(e.PrimaryKey.KeyId, 16))
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}
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pubKeys = append(pubKeys, encryptionKey.PublicKey)
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}
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if len(pubKeys) == 0 {
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return nil, errors.New("cannot set key: no public key available")
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}
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for _, pub := range pubKeys {
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if err := packet.SerializeEncryptedKey(outbuf, pub, cf, sk.Key, nil); err != nil {
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err = fmt.Errorf("gopenpgp: cannot set key: %v", err)
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return nil, err
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}
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}
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return outbuf.Bytes(), nil
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}
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