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attest: update go-tpm and switch hash method

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go-tpm recently removed Algorithm.HashConstructor() in favor of
Algorithm.Hash(). Update go-tpm dependency and use the new method.
This commit is contained in:
Eric Chiang 2019-10-18 10:39:55 -04:00
parent 25ce56400c
commit 7b7e21da78
5 changed files with 10 additions and 24 deletions
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10
attest/activation.go
View File

@ -121,11 +121,11 @@ func (p *ActivationParameters) checkTPM20AKParameters() error {
// Compute & verify that the creation data matches the digest in the
// attestation structure.
nameHashConstructor, err := pub.NameAlg.HashConstructor()
nameHash, err := pub.NameAlg.Hash()
if err != nil {
return fmt.Errorf("HashConstructor() failed: %v", err)
}
h := nameHashConstructor()
h := nameHash.New()
h.Write(p.AK.CreateData)
if !bytes.Equal(att.AttestedCreationInfo.OpaqueDigest, h.Sum(nil)) {
return errors.New("attestation refers to different public key")
@ -161,13 +161,13 @@ func (p *ActivationParameters) checkTPM20AKParameters() error {
// Check the signature over the attestation data verifies correctly.
pk := rsa.PublicKey{E: int(pub.RSAParameters.Exponent()), N: pub.RSAParameters.Modulus()}
signHashConstructor, err := pub.RSAParameters.Sign.Hash.HashConstructor()
signHash, err := pub.RSAParameters.Sign.Hash.Hash()
if err != nil {
return err
}
hsh := signHashConstructor()
hsh := signHash.New()
hsh.Write(p.AK.CreateAttestation)
verifyHash, err := cryptoHash(pub.RSAParameters.Sign.Hash)
verifyHash, err := pub.RSAParameters.Sign.Hash.Hash()
if err != nil {
return err
}

4
attest/attest.go
View File

@ -241,9 +241,9 @@ func ParseAKPublic(version TPMVersion, public []byte) (*AKPublic, error) {
var h crypto.Hash
switch pub.Type {
case tpm2.AlgRSA:
h, err = cryptoHash(pub.RSAParameters.Sign.Hash)
h, err = pub.RSAParameters.Sign.Hash.Hash()
case tpm2.AlgECC:
h, err = cryptoHash(pub.ECCParameters.Sign.Hash)
h, err = pub.ECCParameters.Sign.Hash.Hash()
default:
return nil, fmt.Errorf("unsupported public key type 0x%x", pub.Type)
}

16
attest/tpm.go
View File

@ -16,7 +16,6 @@ package attest
import (
"bytes"
"crypto"
"crypto/rsa"
"crypto/sha256"
"encoding/base64"
@ -99,21 +98,6 @@ var (
}
)
func cryptoHash(h tpm2.Algorithm) (crypto.Hash, error) {
switch h {
case tpm2.AlgSHA1:
return crypto.SHA1, nil
case tpm2.AlgSHA256:
return crypto.SHA256, nil
case tpm2.AlgSHA384:
return crypto.SHA384, nil
case tpm2.AlgSHA512:
return crypto.SHA512, nil
default:
return crypto.Hash(0), fmt.Errorf("unsupported signature digest: %v", h)
}
}
type tpm20Info struct {
vendor string
manufacturer TCGVendorID

2
go.mod
View File

@ -4,7 +4,7 @@ go 1.12
require (
github.com/google/certificate-transparency-go v1.0.22-0.20190605205155-41fc2ef3a2a8
github.com/google/go-tpm v0.2.1-0.20190919221813-f772099985c3
github.com/google/go-tpm v0.2.1-0.20191015210219-431489f43254
github.com/google/go-tpm-tools v0.1.1
github.com/google/go-tspi v0.2.1-0.20190423175329-115dea689aad
golang.org/x/crypto v0.0.0-20190911031432-227b76d455e7 // indirect

2
go.sum
View File

@ -17,6 +17,8 @@ github.com/google/go-tpm v0.1.2-0.20190725015402-ae6dd98980d4/go.mod h1:H9HbmUG2
github.com/google/go-tpm v0.2.1-0.20190910203116-33a9c3f38379/go.mod h1:gTv8GNuqS7CI+tQWrpt5BMMaD5W3G+dZULQLhhAKT5c=
github.com/google/go-tpm v0.2.1-0.20190919221813-f772099985c3 h1:VJTqpj8yU29QGqBMAHEuGukOS4PfKAum5FKXoHsbUj0=
github.com/google/go-tpm v0.2.1-0.20190919221813-f772099985c3/go.mod h1:gTv8GNuqS7CI+tQWrpt5BMMaD5W3G+dZULQLhhAKT5c=
github.com/google/go-tpm v0.2.1-0.20191015210219-431489f43254 h1:ahwXCP5Ui0eYBO9nM71/BzWwVtnGjfZ4OsnDE0V2pMA=
github.com/google/go-tpm v0.2.1-0.20191015210219-431489f43254/go.mod h1:gTv8GNuqS7CI+tQWrpt5BMMaD5W3G+dZULQLhhAKT5c=
github.com/google/go-tpm-tools v0.0.0-20190906225433-1614c142f845/go.mod h1:AVfHadzbdzHo54inR2x1v640jdi1YSi3NauM2DUsxk0=
github.com/google/go-tpm-tools v0.1.1 h1:oxbHulx5A+yHrJW6DdEuATED1ixTswHyldrbC8fdFlw=
github.com/google/go-tpm-tools v0.1.1/go.mod h1:gIwN0GIUFk8cgICog9SxSknHh4hmLrQApJfB5Ssft7g=