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HASHBYTES (Transact-SQL)

Returns the MD2, MD4, MD5, SHA, or SHA1 hash of its input.

Topic link icon Transact-SQL Syntax Conventions


HashBytes ( '<algorithm>', { @input | 'input' } )

<algorithm>::= MD2 | MD4 | MD5 | SHA | SHA1
'<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 a string to be hashed.

varbinary (maximum 8000 bytes)

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.

The following example returns the SHA1 hash of the nvarchar data stored in variable @HashThis.

DECLARE @HashThis nvarchar(4000);
SELECT @HashThis = CONVERT(nvarchar(4000),'dslfdkjLK85kldhnv$n000#knf');
SELECT HashBytes('SHA1', @HashThis);
GO
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