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key_util.go
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key_util.go
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// Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: MPL-2.0
package pki
import (
"context"
"crypto"
"encoding/pem"
"errors"
"fmt"
"github.com/hashicorp/vault/sdk/helper/certutil"
"github.com/hashicorp/vault/sdk/helper/errutil"
)
func comparePublicKey(sc *storageContext, key *keyEntry, publicKey crypto.PublicKey) (bool, error) {
publicKeyForKeyEntry, err := getPublicKey(sc.Context, sc.Backend, key)
if err != nil {
return false, err
}
return certutil.ComparePublicKeysAndType(publicKeyForKeyEntry, publicKey)
}
func getPublicKey(ctx context.Context, b *backend, key *keyEntry) (crypto.PublicKey, error) {
if key.PrivateKeyType == certutil.ManagedPrivateKey {
keyId, err := extractManagedKeyId([]byte(key.PrivateKey))
if err != nil {
return nil, err
}
return getManagedKeyPublicKey(ctx, b, keyId)
}
signer, _, _, err := getSignerFromKeyEntryBytes(key)
if err != nil {
return nil, err
}
return signer.Public(), nil
}
func getSignerFromKeyEntryBytes(key *keyEntry) (crypto.Signer, certutil.BlockType, *pem.Block, error) {
if key.PrivateKeyType == certutil.UnknownPrivateKey {
return nil, certutil.UnknownBlock, nil, errutil.InternalError{Err: fmt.Sprintf("unsupported unknown private key type for key: %s (%s)", key.ID, key.Name)}
}
if key.PrivateKeyType == certutil.ManagedPrivateKey {
return nil, certutil.UnknownBlock, nil, errutil.InternalError{Err: fmt.Sprintf("can not get a signer from a managed key: %s (%s)", key.ID, key.Name)}
}
bytes, blockType, blk, err := getSignerFromBytes([]byte(key.PrivateKey))
if err != nil {
return nil, certutil.UnknownBlock, nil, errutil.InternalError{Err: fmt.Sprintf("failed parsing key entry bytes for key id: %s (%s): %s", key.ID, key.Name, err.Error())}
}
return bytes, blockType, blk, nil
}
func getSignerFromBytes(keyBytes []byte) (crypto.Signer, certutil.BlockType, *pem.Block, error) {
pemBlock, _ := pem.Decode(keyBytes)
if pemBlock == nil {
return nil, certutil.UnknownBlock, pemBlock, errutil.InternalError{Err: "no data found in PEM block"}
}
signer, blk, err := certutil.ParseDERKey(pemBlock.Bytes)
if err != nil {
return nil, certutil.UnknownBlock, pemBlock, errutil.InternalError{Err: fmt.Sprintf("failed to parse PEM block: %s", err.Error())}
}
return signer, blk, pemBlock, nil
}
func getPublicKeyFromBytes(keyBytes []byte) (crypto.PublicKey, error) {
signer, _, _, err := getSignerFromBytes(keyBytes)
if err != nil {
return nil, errutil.InternalError{Err: fmt.Sprintf("failed parsing key bytes: %s", err.Error())}
}
return signer.Public(), nil
}
func importKeyFromBytes(sc *storageContext, keyValue string, keyName string) (*keyEntry, bool, error) {
signer, _, _, err := getSignerFromBytes([]byte(keyValue))
if err != nil {
return nil, false, err
}
privateKeyType := certutil.GetPrivateKeyTypeFromSigner(signer)
if privateKeyType == certutil.UnknownPrivateKey {
return nil, false, errors.New("unsupported private key type within pem bundle")
}
key, existed, err := sc.importKey(keyValue, keyName, privateKeyType)
if err != nil {
return nil, false, err
}
return key, existed, nil
}