如何在USQL中SHA2散列字符串 [英] How to SHA2 hash a string in USQL

问题描述

我试图在USQL中为字符串列运行单向散列。有没有办法做到这一点？大多数在线发现的C＃示例需要多行代码 - 这在USQL中很棘手，没有代码隐藏或编译的C＃程序集。 解决方案

选项1（内联公式）：

以下代码可用于编译任何字符串上的SHA256或MD5，并运行

  CREATE TABLE master.dbo.Test_MyEmail_Hashes AS 
 SELECT 
 cust.CustEmailAddr AS电子邮件
，String.Concat（System.Security.Cryptography.SHA256.Create（）
 .ComputeHash（Encoding.UTF8.GetBytes（
 cust.CustEmailAddr） ）
 .Select（item => item.ToString（x2）））
 AS Email_SHA2 
，String.Concat（System.Security.Cryptography.MD5.Create（）
 .ComputeHash（Encoding.UTF8.GetBytes（
 cu st.CustEmailAddr））
 .Select（item => item.ToString（x2）））
 AS Email_MD5 
 FROM master.dbo.Customers AS cust 
; 
  

选项2（使用Lambda函数）：（UPDATED）

感谢@MichaelRys提供的USQL现在支持Lambda函数的指针，可以像下面这样清理：

  // Generic get_hash（）函数
 DECLARE @get_hash Func< string，System.Security.Cryptography.HashAlgorithm，string> = 
（raw_value，hasher）=> String.Concat（hasher.ComputeHash（Encoding.UTF8.GetBytes（RAW_VALUE）））; 
 
 // MD5和SHA256的简写函数：
 DECLARE @ md5 = System.Security.Cryptography.MD5.Create（）; 
 DECLARE @ get_md5 Func< string，string> = 
（raw_value）=> @get_hash（raw_value，@ md5）; 
 DECLARE @ sha256 = System.Security.Cryptography.SHA256.Create（）; 
 DECLARE @ get_sha256 Func< string，string> = 
（raw_value）=> @get_hash（raw_value，@ sha256）; 
 
 //核心查询：
 CREATE TABLE master.dbo.Test_MyEmail_Hashes AS 
 SELECT 
 cust.CustEmailAddr AS电子邮件
，@ get_sha256（cust.CustEmailAddr ）AS Email_SHA2 
，@ get_md5（cust.CustEmailAddr）AS Email_MD5 
 FROM master.dbo.Customers AS cust 
  

I am trying to run a one-way hash for a string column in USQL. Is there a way to do this inline? Most of the C# samples found online require multiple lines of code - which is tricky in USQL without a code-behind or compiled C# assembly.

解决方案

Option 1 (Inline formula):

The code below can be used to compile a SHA256 or MD5 on any string, and runs without any special dependencies and without needing a code-behind file.

CREATE TABLE master.dbo.Test_MyEmail_Hashes AS
SELECT
      cust.CustEmailAddr          AS Email
    , String.Concat(System.Security.Cryptography.SHA256.Create()
                    .ComputeHash(Encoding.UTF8.GetBytes(
                        cust.CustEmailAddr))
                    .Select(item => item.ToString("x2")))
                                  AS Email_SHA2
    , String.Concat(System.Security.Cryptography.MD5.Create()
                    .ComputeHash(Encoding.UTF8.GetBytes(
                        cust.CustEmailAddr))
                    .Select(item => item.ToString("x2")))
                                  AS Email_MD5
FROM master.dbo.Customers AS cust
;

Option 2 (using Lambda functions): (UPDATED)

Thanks to @MichaelRys for the pointer that USQL now supports Lambda functions and can be cleaned up as in the below:

// Generic get_hash() function
DECLARE @get_hash Func<string,System.Security.Cryptography.HashAlgorithm,string> =
     (raw_value, hasher) => String.Concat(hasher.ComputeHash(Encoding.UTF8.GetBytes(raw_value)));

// Short-hand functions for MD5 and SHA256:
DECLARE @md5    = System.Security.Cryptography.MD5.Create();
DECLARE @get_md5 Func<string,string> =
    (raw_value) => @get_hash(raw_value, @md5);
DECLARE @sha256 = System.Security.Cryptography.SHA256.Create();
DECLARE @get_sha256 Func<string,string> =
    (raw_value) => @get_hash(raw_value, @sha256);

// Core query:
CREATE TABLE master.dbo.Test_MyEmail_Hashes AS
SELECT
      cust.CustEmailAddr                AS Email
    , @get_sha256(cust.CustEmailAddr)   AS Email_SHA2
    , @get_md5(cust.CustEmailAddr)      AS Email_MD5
FROM master.dbo.Customers AS cust

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