mirror of https://github.com/kubernetes/kops.git
55 lines
1.3 KiB
Go
55 lines
1.3 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package sshcredentials
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import (
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"bytes"
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"crypto/md5"
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"fmt"
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"golang.org/x/crypto/ssh"
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)
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func Fingerprint(pubkey string) (string, error) {
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sshPublicKey, _, _, _, err := ssh.ParseAuthorizedKey([]byte(pubkey))
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if err != nil {
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return "", fmt.Errorf("error parsing SSH public key: %v", err)
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}
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// compute fingerprint to serve as id
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h := md5.New()
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_, err = h.Write(sshPublicKey.Marshal())
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if err != nil {
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return "", fmt.Errorf("error fingerprinting SSH public key: %v", err)
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}
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id := formatFingerprint(h.Sum(nil))
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return id, nil
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}
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func formatFingerprint(data []byte) string {
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var buf bytes.Buffer
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for i, b := range data {
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s := fmt.Sprintf("%0.2x", b)
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if i != 0 {
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buf.WriteString(":")
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}
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buf.WriteString(s)
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}
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return buf.String()
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}
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