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95 lines
2.1 KiB
Go
95 lines
2.1 KiB
Go
/*
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** Copyright 2019 Bloomberg Finance L.P.
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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 tpm
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import (
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"crypto/sha256"
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"encoding/pem"
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"errors"
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"fmt"
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"github.com/google/certificate-transparency-go/x509"
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"github.com/google/go-attestation/attest"
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)
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type AttestationData struct {
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EK []byte
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AK *attest.AttestationParameters
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}
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type Challenge struct {
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EC *attest.EncryptedCredential
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}
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type KeyData struct {
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Keys []string `json:"keys"`
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}
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type ChallengeResponse struct {
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Secret []byte
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}
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func GetPubHash(ek *attest.EK) (string, error) {
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data, err := pubBytes(ek)
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if err != nil {
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return "", err
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}
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pubHash := sha256.Sum256(data)
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hashEncoded := fmt.Sprintf("%x", pubHash)
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return hashEncoded, nil
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}
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func pubBytes(ek *attest.EK) ([]byte, error) {
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data, err := x509.MarshalPKIXPublicKey(ek.Public)
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if err != nil {
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return nil, fmt.Errorf("error marshaling ec public key: %v", err)
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}
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return data, nil
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}
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func DecodeEK(pemBytes []byte) (*attest.EK, error) {
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block, _ := pem.Decode(pemBytes)
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if block == nil {
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return nil, errors.New("invalid pemBytes")
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}
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switch block.Type {
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case "CERTIFICATE":
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cert, err := x509.ParseCertificate(block.Bytes)
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if err != nil {
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return nil, fmt.Errorf("error parsing certificate: %v", err)
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}
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return &attest.EK{
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Certificate: cert,
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Public: cert.PublicKey,
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}, nil
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case "PUBLIC KEY":
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pub, err := x509.ParsePKIXPublicKey(block.Bytes)
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if err != nil {
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return nil, fmt.Errorf("error parsing ecdsa public key: %v", err)
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}
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return &attest.EK{
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Public: pub,
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}, nil
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}
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return nil, fmt.Errorf("invalid pem type: %s", block.Type)
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}
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