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crypto: signing builds with signify/minisign (ethereum#21798)
* internal/build: implement signify's signing func * Add signify to the ci utility * fix output file format * Add unit test for signify * holiman's + travis' feedback * internal/build: verify signify's output * crypto: move signify to common dir * use go-minisign to verify binaries * more holiman feedback * crypto, ci: support minisign output * only accept one-line trusted comments * configurable untrusted comments * code cleanup in tests * revert to use ed25519 from the stdlib * bug: fix for empty untrusted comments * write timestamp as comment if trusted comment isn't present * rename line checker to commentHasManyLines * crypto: added signify fuzzer (#6) * crypto: added signify fuzzer * stuff * crypto: updated signify fuzzer to fuzz comments * crypto: repro signify crashes * rebased fuzzer on build-signify branch * hide fuzzer behind gofuzz build flag * extract key data inside a single function * don't treat \r as a newline * travis: fix signing command line * do not use an external binary in tests * crypto: move signify to crypto/signify * travis: fix formatting issue * ci: fix linter build after package move Co-authored-by: Marius van der Wijden <m.vanderwijden@live.de>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,118 @@ | ||
| // Copyright 2020 The go-ethereum Authors | ||
| // This file is part of the go-ethereum library. | ||
| // | ||
| // The go-ethereum library is free software: you can redistribute it and/or modify | ||
| // it under the terms of the GNU Lesser General Public License as published by | ||
| // the Free Software Foundation, either version 3 of the License, or | ||
| // (at your option) any later version. | ||
| // | ||
| // The go-ethereum library 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 Lesser General Public License for more details. | ||
| // | ||
| // You should have received a copy of the GNU Lesser General Public License | ||
| // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. | ||
|
|
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| // signFile reads the contents of an input file and signs it (in armored format) | ||
| // with the key provided, placing the signature into the output file. | ||
|
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| package signify | ||
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| import ( | ||
| "encoding/base64" | ||
| "errors" | ||
| "fmt" | ||
| "io/ioutil" | ||
| "os" | ||
| "strings" | ||
| "time" | ||
|
|
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| "crypto/ed25519" | ||
| ) | ||
|
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| var ( | ||
| errInvalidKeyHeader = errors.New("Incorrect key header") | ||
| errInvalidKeyLength = errors.New("invalid, key length != 104") | ||
| ) | ||
|
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| func parsePrivateKey(key string) (ed25519.PrivateKey, []byte, []byte, error) { | ||
| keydata, err := base64.StdEncoding.DecodeString(key) | ||
| if err != nil { | ||
| return nil, nil, nil, err | ||
| } | ||
|
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| if len(keydata) != 104 { | ||
| return nil, nil, nil, errInvalidKeyLength | ||
| } | ||
|
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| if string(keydata[:2]) != "Ed" { | ||
| return nil, nil, nil, errInvalidKeyHeader | ||
| } | ||
|
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| return ed25519.PrivateKey(keydata[40:]), keydata[:2], keydata[32:40], nil | ||
| } | ||
|
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| func commentHasManyLines(comment string) bool { | ||
| firstLFIndex := strings.IndexByte(comment, 10) | ||
| return (firstLFIndex >= 0 && firstLFIndex < len(comment)-1) | ||
| } | ||
|
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| // SignifySignFile creates a signature of the input file. | ||
| func SignifySignFile(input string, output string, key string, unTrustedComment string, trustedComment string) error { | ||
| in, err := os.Open(input) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| defer in.Close() | ||
|
|
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| out, err := os.Create(output) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| defer out.Close() | ||
|
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| skey, header, keyNum, err := parsePrivateKey(key) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
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| filedata, err := ioutil.ReadAll(in) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
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| rawSig := ed25519.Sign(skey, filedata) | ||
|
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| var sigdata []byte | ||
| sigdata = append(sigdata, header...) | ||
| sigdata = append(sigdata, keyNum...) | ||
| sigdata = append(sigdata, rawSig...) | ||
|
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| // Check that the trusted comment fits in one line | ||
| if commentHasManyLines(unTrustedComment) { | ||
| return errors.New("untrusted comment must fit on a single line") | ||
| } | ||
|
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| if unTrustedComment == "" { | ||
| unTrustedComment = "verify with " + input + ".pub" | ||
| } | ||
| out.WriteString(fmt.Sprintf("untrusted comment: %s\n%s\n", unTrustedComment, base64.StdEncoding.EncodeToString(sigdata))) | ||
|
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| // Add the trusted comment if unavailable | ||
| if trustedComment == "" { | ||
| trustedComment = fmt.Sprintf("timestamp:%d", time.Now().Unix()) | ||
| } | ||
|
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| // Check that the trusted comment fits in one line | ||
| if commentHasManyLines(trustedComment) { | ||
| return errors.New("trusted comment must fit on a single line") | ||
| } | ||
|
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| var sigAndComment []byte | ||
| sigAndComment = append(sigAndComment, rawSig...) | ||
| sigAndComment = append(sigAndComment, []byte(trustedComment)...) | ||
| out.WriteString(fmt.Sprintf("trusted comment: %s\n%s\n", trustedComment, base64.StdEncoding.EncodeToString(ed25519.Sign(skey, sigAndComment)))) | ||
|
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| return nil | ||
| } |
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