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// Copyright 2013 Canonical Ltd.
// Licensed under the LGPLv3, see LICENCE file for details.
package ssh_test
import (
"crypto/dsa"
"crypto/rsa"
"io"
"github.com/juju/testing"
jc "github.com/juju/testing/checkers"
gc "gopkg.in/check.v1"
"github.com/juju/utils/ssh"
)
type GenerateSuite struct {
testing.IsolationSuite
}
var _ = gc.Suite(&GenerateSuite{})
var (
pregeneratedKey *rsa.PrivateKey
alternativeRSAKey *rsa.PrivateKey
)
// overrideGenerateKey patches out rsa.GenerateKey to create a single testing
// key which is saved and used between tests to save computation time.
func overrideGenerateKey(c *gc.C) testing.Restorer {
restorer := testing.PatchValue(ssh.RSAGenerateKey, func(random io.Reader, bits int) (*rsa.PrivateKey, error) {
if pregeneratedKey != nil {
return pregeneratedKey, nil
}
key, err := generateRSAKey(random)
if err != nil {
return nil, err
}
pregeneratedKey = key
return key, nil
})
return restorer
}
func generateRSAKey(random io.Reader) (*rsa.PrivateKey, error) {
// Ignore requested bits and just use 512 bits for speed
key, err := rsa.GenerateKey(random, 512)
if err != nil {
return nil, err
}
key.Precompute()
return key, nil
}
func generateDSAKey(random io.Reader) (*dsa.PrivateKey, error) {
var privKey dsa.PrivateKey
if err := dsa.GenerateParameters(&privKey.Parameters, random, dsa.L1024N160); err != nil {
return nil, err
}
if err := dsa.GenerateKey(&privKey, random); err != nil {
return nil, err
}
return &privKey, nil
}
func (s *GenerateSuite) TestGenerate(c *gc.C) {
defer overrideGenerateKey(c).Restore()
private, public, err := ssh.GenerateKey("some-comment")
c.Check(err, jc.ErrorIsNil)
c.Check(private, jc.HasPrefix, "-----BEGIN RSA PRIVATE KEY-----\n")
c.Check(private, jc.HasSuffix, "-----END RSA PRIVATE KEY-----\n")
c.Check(public, jc.HasPrefix, "ssh-rsa ")
c.Check(public, jc.HasSuffix, " some-comment\n")
}
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