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package sshsig
import (
"encoding/pem"
"errors"
"fmt"
)
// PEMType is the PEM type of an armored SSH signature.
const PEMType = "SSH SIGNATURE"
// Armor returns a PEM-encoded Signature. It does not perform any validation.
func Armor(s *Signature) []byte {
return pem.EncodeToMemory(&pem.Block{
Type: PEMType,
Bytes: s.Marshal(),
})
}
// Unarmor decodes a PEM-encoded signature into a Signature. It returns an
// error if the PEM block is invalid or the signature parsing fails.
func Unarmor(b []byte) (*Signature, error) {
p, _ := pem.Decode(b)
if p == nil {
return nil, errors.New("invalid PEM block")
}
if p.Type != PEMType {
return nil, fmt.Errorf("invalid PEM type %q: expected %q", p.Type, PEMType)
}
return ParseSignature(p.Bytes)
}
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