HASHBYTES (Transact-SQL)
Returns the MD2, MD4, MD5, SHA, SHA1, or SHA2 hash of its input.
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Transact-SQL Syntax Conventions
Syntax
HASHBYTES ( '<algorithm>', { @input | 'input' } )
<algorithm>::= MD2 | MD4 | MD5 | SHA | SHA1 | SHA2_256 | SHA2_512
Arguments
'<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.
Return Value
varbinary (maximum 8000 bytes)
Remarks
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.
Examples
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