Export (0) Print
Expand All

HASHBYTES (Transact-SQL)

Returns the MD2, MD4, MD5, SHA, SHA1, or SHA2 hash of its input in SQL Server.

Applies to: SQL Server (SQL Server 2008 through current version).

Topic link icon Transact-SQL Syntax Conventions

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.

@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.

Allowed input values are limited to 8000 bytes. 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 SQL Server 2012 through SQL Server 2014.

varbinary (maximum 8000 bytes)

Return the hash of a variable

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);

Return the hash of a table column

The following example returns the SHA1 hash of the values in column c1 in the table Test1.

CREATE TABLE dbo.Test1 (c1 nvarchar(50));
GO
INSERT dbo.Test1 VALUES ('This is a test.'), ('This is test 2.');
GO
SELECT HASHBYTES('SHA1', c1) FROM dbo.Test1;

Here is the result set.

-------------------------------------------
0x0E7AAB0B4FF0FD2DFB4F0233E2EE7A26CD08F173
0xF643A82F948DEFB922B12E50B950CEE130A934D6

(2 row(s) affected)
Was this page helpful?
(1500 characters remaining)
Thank you for your feedback

Community Additions

ADD
Show:
© 2014 Microsoft