/
algorithm.go
63 lines (52 loc) · 2.25 KB
/
algorithm.go
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// Copyright 2020 Jeremy Stott
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
// of the Software, and to permit persons to whom the Software is furnished to do
// so, subject to the following conditions:
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
// PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
// https://github.com/stoggi/sshrimp/blob/master/internal/signer/algorithm.go
package signer
import (
"crypto"
"errors"
"io"
"golang.org/x/crypto/ssh"
)
type sshAlgorithmSigner struct {
algorithm string
signer ssh.AlgorithmSigner
}
// PublicKey returns the wrapped signers public key
func (s *sshAlgorithmSigner) PublicKey() ssh.PublicKey {
return s.signer.PublicKey()
}
// Sign uses the correct algorithm to sign the certificate
func (s *sshAlgorithmSigner) Sign(rand io.Reader, data []byte) (*ssh.Signature, error) {
return s.signer.SignWithAlgorithm(rand, data, s.algorithm)
}
// NewAlgorithmSignerFromSigner returns a ssh.Signer with a different default algorithm.
// Waiting for upstream changes to x/crypto/ssh, see: https://github.com/golang/go/issues/36261
func NewAlgorithmSignerFromSigner(signer crypto.Signer, algorithm string) (ssh.Signer, error) {
sshSigner, err := ssh.NewSignerFromSigner(signer)
if err != nil {
return nil, err
}
algorithmSigner, ok := sshSigner.(ssh.AlgorithmSigner)
if !ok {
return nil, errors.New("unable to cast to ssh.AlgorithmSigner")
}
s := sshAlgorithmSigner{
signer: algorithmSigner,
algorithm: algorithm,
}
return &s, nil
}