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| from abc import ABC, abstractmethod
from typing import Optional, Dict, Any
import boto3
from azure.identity import DefaultAzureCredential
from azure.keyvault.keys import KeyClient
from azure.keyvault.keys.crypto import CryptographyClient, SignatureAlgorithm
from google.cloud import kms
class CloudKMSProvider(ABC):
"""雲端 KMS 抽象基類"""
@abstractmethod
def get_public_key(self, key_id: str) -> bytes:
"""取得公鑰"""
pass
@abstractmethod
def sign(self, key_id: str, data: bytes, algorithm: str) -> bytes:
"""簽署資料"""
pass
@abstractmethod
def verify(self, key_id: str, data: bytes, signature: bytes, algorithm: str) -> bool:
"""驗證簽章"""
pass
class AWSKMSProvider(CloudKMSProvider):
"""AWS KMS 實作"""
def __init__(self, region: str = 'ap-northeast-1'):
self.client = boto3.client('kms', region_name=region)
def get_public_key(self, key_id: str) -> bytes:
response = self.client.get_public_key(KeyId=key_id)
return response['PublicKey']
def sign(self, key_id: str, data: bytes, algorithm: str = 'RSASSA_PKCS1_V1_5_SHA_256') -> bytes:
response = self.client.sign(
KeyId=key_id,
Message=data,
MessageType='RAW',
SigningAlgorithm=algorithm
)
return response['Signature']
def verify(self, key_id: str, data: bytes, signature: bytes,
algorithm: str = 'RSASSA_PKCS1_V1_5_SHA_256') -> bool:
try:
response = self.client.verify(
KeyId=key_id,
Message=data,
MessageType='RAW',
Signature=signature,
SigningAlgorithm=algorithm
)
return response['SignatureValid']
except Exception:
return False
class AzureKeyVaultProvider(CloudKMSProvider):
"""Azure Key Vault 實作"""
def __init__(self, vault_url: str):
self.credential = DefaultAzureCredential()
self.vault_url = vault_url
self.key_client = KeyClient(vault_url=vault_url, credential=self.credential)
def get_public_key(self, key_id: str) -> bytes:
key = self.key_client.get_key(key_id)
# 轉換為 DER 格式
from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.primitives.asymmetric import rsa
public_key = rsa.RSAPublicNumbers(
e=int.from_bytes(key.key.e, 'big'),
n=int.from_bytes(key.key.n, 'big')
).public_key()
return public_key.public_bytes(
encoding=serialization.Encoding.DER,
format=serialization.PublicFormat.SubjectPublicKeyInfo
)
def sign(self, key_id: str, data: bytes, algorithm: str = 'RS256') -> bytes:
key = self.key_client.get_key(key_id)
crypto_client = CryptographyClient(key=key, credential=self.credential)
import hashlib
digest = hashlib.sha256(data).digest()
result = crypto_client.sign(
algorithm=SignatureAlgorithm.rs256,
digest=digest
)
return result.signature
def verify(self, key_id: str, data: bytes, signature: bytes, algorithm: str = 'RS256') -> bool:
key = self.key_client.get_key(key_id)
crypto_client = CryptographyClient(key=key, credential=self.credential)
import hashlib
digest = hashlib.sha256(data).digest()
result = crypto_client.verify(
algorithm=SignatureAlgorithm.rs256,
digest=digest,
signature=signature
)
return result.is_valid
class GCPKMSProvider(CloudKMSProvider):
"""GCP Cloud KMS 實作"""
def __init__(self, project_id: str, location: str, keyring: str):
self.client = kms.KeyManagementServiceClient()
self.project_id = project_id
self.location = location
self.keyring = keyring
def _get_key_version_name(self, key_id: str, version: str = '1') -> str:
return self.client.crypto_key_version_path(
self.project_id, self.location, self.keyring, key_id, version
)
def get_public_key(self, key_id: str) -> bytes:
key_version_name = self._get_key_version_name(key_id)
response = self.client.get_public_key(request={"name": key_version_name})
from cryptography.hazmat.primitives import serialization
public_key = serialization.load_pem_public_key(response.pem.encode())
return public_key.public_bytes(
encoding=serialization.Encoding.DER,
format=serialization.PublicFormat.SubjectPublicKeyInfo
)
def sign(self, key_id: str, data: bytes, algorithm: str = 'SHA256') -> bytes:
import hashlib
digest = hashlib.sha256(data).digest()
key_version_name = self._get_key_version_name(key_id)
response = self.client.asymmetric_sign(
request={
"name": key_version_name,
"digest": {"sha256": digest}
}
)
return response.signature
def verify(self, key_id: str, data: bytes, signature: bytes, algorithm: str = 'SHA256') -> bool:
# GCP 不直接提供驗證 API，使用公鑰本地驗證
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.asymmetric import padding
from cryptography.hazmat.primitives import serialization
try:
public_key_der = self.get_public_key(key_id)
public_key = serialization.load_der_public_key(public_key_der)
public_key.verify(
signature,
data,
padding.PKCS1v15(),
hashes.SHA256()
)
return True
except Exception:
return False
class MultiCloudKMSManager:
"""多雲 KMS 管理器"""
def __init__(self):
self.providers: Dict[str, CloudKMSProvider] = {}
def register_provider(self, name: str, provider: CloudKMSProvider):
"""註冊雲端提供者"""
self.providers[name] = provider
def get_provider(self, name: str) -> Optional[CloudKMSProvider]:
"""取得雲端提供者"""
return self.providers.get(name)
def sign_with_provider(self, provider_name: str, key_id: str,
data: bytes, algorithm: str = None) -> bytes:
"""使用指定提供者簽署"""
provider = self.get_provider(provider_name)
if not provider:
raise ValueError(f"Provider {provider_name} not found")
return provider.sign(key_id, data, algorithm or 'default')
# 使用範例
if __name__ == "__main__":
manager = MultiCloudKMSManager()
# 註冊各雲端提供者
manager.register_provider('aws', AWSKMSProvider(region='ap-northeast-1'))
manager.register_provider('azure', AzureKeyVaultProvider(
vault_url='https://my-vault.vault.azure.net/'
))
manager.register_provider('gcp', GCPKMSProvider(
project_id='my-project',
location='asia-east1',
keyring='my-keyring'
))
# 使用 AWS KMS 簽署
data = b"Hello, World!"
signature = manager.sign_with_provider('aws', 'alias/my-key', data)
print(f"AWS signature: {signature.hex()[:32]}...")
|