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| 1 | +// Copyright 2022 The Sigstore Authors. |
| 2 | +// |
| 3 | +// Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | +// you may not use this file except in compliance with the License. |
| 5 | +// You may obtain a copy of the License at |
| 6 | +// |
| 7 | +// http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | +// |
| 9 | +// Unless required by applicable law or agreed to in writing, software |
| 10 | +// distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | +// See the License for the specific language governing permissions and |
| 13 | +// limitations under the License. |
| 14 | + |
| 15 | +package utils |
| 16 | + |
| 17 | +import ( |
| 18 | + "crypto/x509" |
| 19 | + "encoding/pem" |
| 20 | +) |
| 21 | + |
| 22 | +func IsValidKey(b []byte) bool { |
| 23 | + valid := true |
| 24 | + pems, validPEM := parsePEMKey(b) |
| 25 | + if !validPEM { |
| 26 | + return false |
| 27 | + } |
| 28 | + |
| 29 | + for _, p := range pems { |
| 30 | + _, err := x509.ParsePKIXPublicKey(p.Bytes) |
| 31 | + if err != nil { |
| 32 | + return false |
| 33 | + } |
| 34 | + } |
| 35 | + |
| 36 | + return valid |
| 37 | +} |
| 38 | + |
| 39 | +func parsePEMKey(b []byte) ([]*pem.Block, bool) { |
| 40 | + pemKey, rest := pem.Decode(b) |
| 41 | + valid := true |
| 42 | + if pemKey == nil { |
| 43 | + return nil, false |
| 44 | + } |
| 45 | + pemBlocks := []*pem.Block{pemKey} |
| 46 | + |
| 47 | + if len(rest) > 0 { |
| 48 | + list, check := parsePEMKey(rest) |
| 49 | + return append(pemBlocks, list...), check |
| 50 | + } |
| 51 | + return pemBlocks, valid |
| 52 | +} |
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