# SHA1 function
<a name="s_SHA1"></a>

The SHA1 function uses the SHA1 cryptographic hash function to convert a variable-length string into a 40-character string that is a text representation of the hexadecimal value of a 160-bit checksum.

## Syntax
<a name="s_SHA1-syntax"></a>

SHA1 is a synonym of [SHA function](s_SHA.md). 

```
SHA1(string)
```

## Arguments
<a name="s_SHA1-arguments"></a>

 *string*   
A variable-length string.

## Return type
<a name="s_SHA1-returm-type"></a>

The SHA1 function returns a 40-character string that is a text representation of the hexadecimal value of a 160-bit checksum. 

## Example
<a name="s_SHA1-example"></a>

The following example returns the 160-bit value for the word 'AWS Clean Rooms': 

```
select sha1('AWS Clean Rooms');
```