e65ed17b41
* Refactor library, remove duplicates * Rebuild structure to use Messages and Signature models * Use PGPSplitMessage * Remove signature model * Various fixes * Add helpers with tests * Fixes, add some docs, add tests * Add attachment helpers * Add helpers Symmetric encryption * Edit docs + examples * Rename kr to keyRing * Various fixes for documentation * Edit JSON handling functions, add decrypt keyring via token * Add proposal changes doc * Fix CI * Drop *Message functions, join CleartextMessage and BinaryMessage * Change canonicalization and trimming only to text signatures * Add cleartextsignature, detach signature from message model, move helpers * Documentation, remove optional parameters * Move verification to separate model * Don't return message in VerifyDetached * Update table of contents in readme * Appease golint * Run go fmt * Rename Encrypt/DecryptMessageWithPassword to ..WithToken These functions shouldn't be used with user-provided passwords, as they don't do any key-stretching. * Change key generation usernames
101 lines
2.6 KiB
Go
101 lines
2.6 KiB
Go
package crypto
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import (
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"bytes"
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"errors"
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"fmt"
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"io"
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"golang.org/x/crypto/openpgp"
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"golang.org/x/crypto/openpgp/packet"
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)
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// RandomToken generated a random token of the same size of the keysize of the default cipher.
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func (pgp *GopenPGP) RandomToken() ([]byte, error) {
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config := &packet.Config{DefaultCipher: packet.CipherAES256}
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return pgp.RandomTokenSize(config.DefaultCipher.KeySize())
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}
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// RandomTokenSize generates a random token with the specified key size
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func (pgp *GopenPGP) RandomTokenSize(size int) ([]byte, error) {
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config := &packet.Config{DefaultCipher: packet.CipherAES256}
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symKey := make([]byte, size)
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if _, err := io.ReadFull(config.Random(), symKey); err != nil {
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return nil, err
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}
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return symKey, nil
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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) (*SymmetricKey, 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 newSymmetricKeyFromEncrypted(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(sessionSplit *SymmetricKey) ([]byte, error) {
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outbuf := &bytes.Buffer{}
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cf := sessionSplit.GetCipherFunc()
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var pub *packet.PublicKey
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for _, e := range keyRing.GetEntities() {
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for _, subKey := range e.Subkeys {
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if !subKey.Sig.FlagsValid || subKey.Sig.FlagEncryptStorage || subKey.Sig.FlagEncryptCommunications {
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pub = subKey.PublicKey
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break
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}
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}
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if pub == nil && len(e.Identities) > 0 {
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var i *openpgp.Identity
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for _, i = range e.Identities {
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break
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}
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if i.SelfSignature.FlagsValid || i.SelfSignature.FlagEncryptStorage || i.SelfSignature.FlagEncryptCommunications {
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pub = e.PrimaryKey
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}
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}
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if pub != nil {
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break
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}
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}
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if pub == nil {
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return nil, errors.New("cannot set key: no public key available")
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}
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if err := packet.SerializeEncryptedKey(outbuf, pub, cf, sessionSplit.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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return outbuf.Bytes(), nil
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}
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