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//
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// Copyright (c) 2018, Joyent, Inc. All rights reserved.
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this
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// file, You can obtain one at http://mozilla.org/MPL/2.0/.
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//
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package authentication
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import (
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"crypto/md5"
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"fmt"
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"strings"
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"golang.org/x/crypto/ssh"
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)
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// formatPublicKeyFingerprint produces the MD5 fingerprint of the given SSH
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// public key. If display is true, the fingerprint is formatted with colons
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// between each byte, as per the output of OpenSSL.
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func formatPublicKeyFingerprint(key ssh.PublicKey, display bool) string {
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publicKeyFingerprint := md5.New()
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publicKeyFingerprint.Write(key.Marshal())
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publicKeyFingerprintString := fmt.Sprintf("%x", publicKeyFingerprint.Sum(nil))
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if !display {
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return publicKeyFingerprintString
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}
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formatted := ""
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for i := 0; i < len(publicKeyFingerprintString); i = i + 2 {
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formatted = fmt.Sprintf("%s%s:", formatted, publicKeyFingerprintString[i:i+2])
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}
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return strings.TrimSuffix(formatted, ":")
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}
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