| title | HASHBYTES (Transact-SQL) | Microsoft Docs | ||
|---|---|---|---|
| ms.custom | |||
| ms.date | 2016-02-03 | ||
| ms.prod | sql-non-specified | ||
| ms.reviewer | |||
| ms.suite | |||
| ms.technology |
|
||
| ms.tgt_pltfrm | |||
| ms.topic | language-reference | ||
| f1_keywords |
|
||
| dev_langs |
|
||
| helpviewer_keywords |
|
||
| ms.assetid | 0ea6a4d1-313e-4f70-b939-dd2cd570f6d6 | ||
| caps.latest.revision | 38 | ||
| author | BYHAM | ||
| ms.author | rickbyh | ||
| manager | jhubbard |
[!INCLUDEtsql-appliesto-ss2008-all_md]
Returns the MD2, MD4, MD5, SHA, SHA1, or SHA2 hash of its input in [!INCLUDEssNoVersion].
Transact-SQL Syntax Conventions
-- Syntax for SQL Server, Azure SQL Database, Azure SQL Data Warehouse, Parallel Data Warehouse
HASHBYTES ( '<algorithm>', { @input | 'input' } )
<algorithm>::= MD2 | MD4 | MD5 | SHA | SHA1 | SHA2_256 | SHA2_512
'<algorithm>'
Identifies the hashing algorithm to be used to hash the input. This is a required argument with no default. The single quotation marks are required. Beginning with [!INCLUDEssSQL15], all algorithms other than SHA2_256, and SHA2_512 are deprecated. Older algorithms (not recommended) will continue working, but they will raise a deprecation event.
@input
Specifies a variable containing the data to be hashed. @input is varchar, nvarchar, or varbinary.
' input '
Specifies an expression that evaluates to a character or binary string to be hashed.
The output conforms to the algorithm standard: 128 bits (16 bytes) for MD2, MD4, and MD5; 160 bits (20 bytes) for SHA and SHA1; 256 bits (32 bytes) for SHA2_256, and 512 bits (64 bytes) for SHA2_512.
| 256 bits (32 bytes) for SHA2_256, and 512 bits (64 bytes) for SHA2_512 applies to [!INCLUDEssSQL11] through [!INCLUDEssCurrent]. |
For [!INCLUDEssSQL14] and earlier, allowed input values are limited to 8000 bytes.
varbinary (maximum 8000 bytes)
The following example returns the SHA1 hash of the nvarchar data stored in variable @HashThis.
DECLARE @HashThis nvarchar(4000);
SET @HashThis = CONVERT(nvarchar(4000),'dslfdkjLK85kldhnv$n000#knf');
SELECT HASHBYTES('SHA1', @HashThis);
The following example returns the SHA1 hash of the values in column c1 in the table Test1.
CREATE TABLE dbo.Test1 (c1 nvarchar(50));
INSERT dbo.Test1 VALUES ('This is a test.');
INSERT dbo.Test1 VALUES ('This is test 2.');
SELECT HASHBYTES('SHA1', c1) FROM dbo.Test1;
[!INCLUDEssResult]
-------------------------------------------
0x0E7AAB0B4FF0FD2DFB4F0233E2EE7A26CD08F173
0xF643A82F948DEFB922B12E50B950CEE130A934D6
(2 row(s) affected)