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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2015 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* 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 asserts
import (
"crypto"
"encoding/base64"
"fmt"
)
// EncodeDigest encodes the digest from hash algorithm to be put in an assertion header.
func EncodeDigest(hash crypto.Hash, hashDigest []byte) (string, error) {
algo := ""
switch hash {
case crypto.SHA512:
algo = "sha512"
case crypto.SHA3_384:
algo = "sha3-384"
default:
return "", fmt.Errorf("unsupported hash")
}
if len(hashDigest) != hash.Size() {
return "", fmt.Errorf("hash digest by %s should be %d bytes", algo, hash.Size())
}
return base64.RawURLEncoding.EncodeToString(hashDigest), nil
}
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