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45 lines
1 KiB
Go
45 lines
1 KiB
Go
// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package pkcs12
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import (
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"crypto/hmac"
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"crypto/sha1"
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"crypto/x509/pkix"
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"encoding/asn1"
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)
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type macData struct {
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Mac digestInfo
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MacSalt []byte
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Iterations int `asn1:"optional,default:1"`
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}
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// from PKCS#7:
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type digestInfo struct {
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Algorithm pkix.AlgorithmIdentifier
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Digest []byte
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}
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var (
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oidSHA1 = asn1.ObjectIdentifier([]int{1, 3, 14, 3, 2, 26})
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)
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func verifyMac(macData *macData, message, password []byte) error {
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if !macData.Mac.Algorithm.Algorithm.Equal(oidSHA1) {
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return NotImplementedError("unknown digest algorithm: " + macData.Mac.Algorithm.Algorithm.String())
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}
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key := pbkdf(sha1Sum, 20, 64, macData.MacSalt, password, macData.Iterations, 3, 20)
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mac := hmac.New(sha1.New, key)
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mac.Write(message)
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expectedMAC := mac.Sum(nil)
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if !hmac.Equal(macData.Mac.Digest, expectedMAC) {
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return ErrIncorrectPassword
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}
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return nil
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}
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