swift – 如何在Vapor 3中处理密码哈希？

但是,我想加盐.我可以在创建时为用户生成一个salt：

static func create(_ req: Request,newUserRequest user: CreateUserRequest) throws -> Future<User.Public> {
    return User.query(on: req).filter(.username == user.username).first().flatMap { existingUser in
        guard existingUser == nil else {
            throw Abort(.badRequest,reason: "A user with the given username already exists.")
        }

        guard user.password == user.passwordVerification else {
            throw Abort(.badRequest,reason: "Given passwords did not match.")
        }

        let count = 16
        var pw_salt_data = Data(count: count)
        let _ = pw_salt_data.withUnsafeMutableBytes { mutableBytes in
            SecRandomCopyBytes(kSecRandomDefault,count,mutableBytes)
        }
        let pw_salt = try BCrypt.hash(pw_salt_data.base64EncodedString())

        let pw_hash = try BCrypt.hash(pw_salt + user.password)

        return User(id: nil,username: user.username,pw_hash: pw_hash,pw_salt: pw_salt,email: user.email).save(on: req).toPublic()
    }
}

但是在登录期间执行身份验证时无法检索该盐：

static func login(_ req: Request) throws -> Future<UserToken> {
    let user = try req.requireAuthenticated(User.self)
    let token = try UserToken.create(userID: user.requireID())
    return token.save(on: req)
}

我希望为每个用户随机生成salt,并将其作为与散列密码分开的列存储在数据库中,以便稍后在身份验证期间使用.

有没有一种标准化的方法来处理在Vapor 3中腌制密码哈希？