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/*
Konec - Public key crypto with OpenSSH keys.
Copyright (C) 2012 Casey Marshall <casey.marshall@gmail.com>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package konec
import (
"crypto"
"crypto/rand"
"crypto/rsa"
"crypto/sha1"
"crypto/sha256"
"encoding/pem"
//"fmt"
"crypto/x509"
"io"
"io/ioutil"
//"bitbucket.org/cmars/go.crypto/ssh"
)
type SshRsaPrivKey struct {
*rsa.PrivateKey
}
func ReadPrivKey(r io.Reader) (sk *SshRsaPrivKey, err error) {
pemContents, err := ioutil.ReadAll(r)
if err != nil {
panic(err)
}
block, _ := pem.Decode(pemContents)
// TODO: support DEK passphrase protected private key cert
rsakey, _ := x509.ParsePKCS1PrivateKey(block.Bytes)
if err != nil {
panic(err)
}
sk = &SshRsaPrivKey{PrivateKey: rsakey}
return
}
func (sk *SshRsaPrivKey) Decrypt(ciphertext []byte) (plaintext []byte, err error) {
return rsa.DecryptOAEP(sha1.New(), rand.Reader, sk.PrivateKey, ciphertext, nil)
}
func (sk *SshRsaPrivKey) Sign(msg []byte) (sig []byte, err error) {
h := sha256.New()
h.Write(msg)
digest := h.Sum(nil)
h.Reset()
return rsa.SignPKCS1v15(rand.Reader, sk.PrivateKey, crypto.SHA256, digest)
}
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