export interface KmsKeyMetadata {
    keySpec: string;
    keyUsage: string;
    keyState: string;
}
export interface IKmsClient {
    signDigest(keyId: string, digest: Uint8Array): Promise<Uint8Array>;
    getPublicKey(keyId: string): Promise<Uint8Array>;
    describeKey(keyId: string): Promise<KmsKeyMetadata>;
}
export declare class AwsKmsClient implements IKmsClient {
    private client;
    constructor(config: {
        region: string;
    });
    signDigest(keyId: string, digest: Uint8Array): Promise<Uint8Array>;
    getPublicKey(keyId: string): Promise<Uint8Array>;
    describeKey(keyId: string): Promise<KmsKeyMetadata>;
}