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44 lines
1.2 KiB
Go
44 lines
1.2 KiB
Go
// -*- Mode: Go; indent-tabs-mode: t -*-
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/*
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* Copyright (C) 2015 Canonical Ltd
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 3 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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package asserts
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import (
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"crypto"
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"encoding/base64"
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"fmt"
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)
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// EncodeDigest encodes the digest from hash algorithm to be put in an assertion header.
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func EncodeDigest(hash crypto.Hash, hashDigest []byte) (string, error) {
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algo := ""
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switch hash {
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case crypto.SHA512:
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algo = "sha512"
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case crypto.SHA3_384:
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algo = "sha3-384"
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default:
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return "", fmt.Errorf("unsupported hash")
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}
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if len(hashDigest) != hash.Size() {
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return "", fmt.Errorf("hash digest by %s should be %d bytes", algo, hash.Size())
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}
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return base64.RawURLEncoding.EncodeToString(hashDigest), nil
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}
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