mirror of https://github.com/google/oss-fuzz.git
45 lines
1.1 KiB
Go
45 lines
1.1 KiB
Go
// Copyright 2022 Google LLC
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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 ecdsa
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import (
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"bytes"
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"crypto/ecdsa"
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"crypto/elliptic"
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)
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func FuzzEcdsaSign(data []byte) int {
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if len(data) < 5 {
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return 0
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}
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c := []elliptic.Curve{
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elliptic.P256(),
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elliptic.P224(),
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elliptic.P384(),
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elliptic.P521(),
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}
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cIndex := int(data[0] % 4)
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firstRandReaderLen := int(data[1])
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data = data[2:]
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if (firstRandReaderLen + 3) > len(data) {
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return 0
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}
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randReader := bytes.NewReader(data[:firstRandReaderLen])
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priv, _ := ecdsa.GenerateKey(c[cIndex], randReader)
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_, _, _ = ecdsa.Sign(randReader, priv, data[firstRandReaderLen+1:])
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return 1
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}
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