Verify与 Amazon SDK 或 CLI 配合使用

验证数字签名

以下 verify 示例验证一条 Base64 编码短消息的加密签名。密钥 ID、消息、消息类型和签名算法必须与用于签名该消息的相同。您指定的签名不得采用 base64 编码。如需解码 sign 命令返回的签名的帮助，请参阅 sign 命令示例。

该命令的输出包括一个布尔 SignatureValid 字段，表示签名已通过验证。如果签名验证失败，verify 命令也会失败。

在运行此命令之前，请将密钥 ID 示例替换为您 Amazon 账户中的有效密钥 ID。

aws kms verify \
    --key-id 1234abcd-12ab-34cd-56ef-1234567890ab \
    --message fileb://EncodedMessage \
    --message-type RAW \
    --signing-algorithm RSASSA_PKCS1_V1_5_SHA_256 \
    --signature fileb://ExampleSignature

输出：

{
    "KeyId": "arn:aws:kms:us-west-2:111122223333:key/1234abcd-12ab-34cd-56ef-1234567890ab",
    "SignatureValid": true,
    "SigningAlgorithm": "RSASSA_PKCS1_V1_5_SHA_256"
}

有关在 KMS 中使用非对称 KMS 密 Amazon 钥的更多信息，请参阅《密钥管理服务开发人员指南》Amazon 中的使用非对称密钥。

class KeyEncrypt:
    def __init__(self, kms_client):
        self.kms_client = kms_client

    @classmethod
    def from_client(cls) -> "KeyEncrypt":
        """
        Creates a KeyEncrypt instance with a default KMS client.

        :return: An instance of KeyEncrypt initialized with the default KMS client.
        """
        kms_client = boto3.client("kms")
        return cls(kms_client)


    def verify(self, key_id: str, message: str, signature: str) -> bool:
        """
        Verifies a signature against a message.

        :param key_id: The ARN or ID of the key used to sign the message.
        :param message: The message to verify.
        :param signature: The signature to verify.
        :return: True when the signature matches the message, otherwise False.
        """
        try:
            response = self.kms_client.verify(
                KeyId=key_id,
                Message=message.encode(),
                Signature=signature,
                SigningAlgorithm="RSASSA_PSS_SHA_256",
            )
            valid = response["SignatureValid"]
            print(f"The signature is {'valid' if valid else 'invalid'}.")
            return valid
        except ClientError as err:
            if err.response["Error"]["Code"] == "SignatureDoesNotMatchException":
                print("The signature is not valid.")
            else:
                logger.error(
                    "Couldn't verify your signature. Here's why: %s",
                    err.response["Error"]["Message"],
                )
            raise