> ## Documentation Index
> Fetch the complete documentation index at: https://docs.e6data.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Hashing

*The Ingest Engine scalar functions are based on* [*Apache DataFusion*](https://arrow.apache.org/datafusion/) *and these docs are derived from the DataFusion function reference.*

| Function | Description | Example | Result |
| - | - | - | - |
| `md5(str)` | MD5 hash | `md5('hello')` | `'5d41402a...'` |
| `sha224(str)` | SHA-224 hash | `sha224('hello')` | `'ea09ae9c...'` |
| `sha256(str)` | SHA-256 hash | `sha256('hello')` | `'2cf24dba...'` |
| `sha384(str)` | SHA-384 hash | `sha384('hello')` | `'59e1748777...'` |
| `sha512(str)` | SHA-512 hash | `sha512('hello')` | `'9b71d224bd...'` |
| `digest(str, algo)` | Hash with algorithm | `digest('hello', 'sha256')` | `'2cf24dba...'` |

## `digest`

Computes the binary hash of an expression using the specified algorithm.

```
digest(expression, algorithm)
```

**Arguments**

* **expression**: String expression to operate on. Can be a constant, column, or function, and any combination of string operators.
* **algorithm**: String expression specifying algorithm to use. Must be one of:
  * md5
  * sha224
  * sha256
  * sha384
  * sha512
  * blake2s
  * blake2b
  * blake3

## `md5`

Computes an MD5 128-bit checksum for a string expression.

```
md5(expression)
```

**Arguments**

* **expression**: String expression to operate on. Can be a constant, column, or function, and any combination of string operators.

## `sha224`

Computes the SHA-224 hash of a binary string.

```
sha224(expression)
```

**Arguments**

* **expression**: String expression to operate on. Can be a constant, column, or function, and any combination of string operators.

## `sha256`

Computes the SHA-256 hash of a binary string.

```
sha256(expression)
```

**Arguments**

* **expression**: String expression to operate on. Can be a constant, column, or function, and any combination of string operators.

## `sha384`

Computes the SHA-384 hash of a binary string.

```
sha384(expression)
```

**Arguments**

* **expression**: String expression to operate on. Can be a constant, column, or function, and any combination of string operators.

## `sha512`

Computes the SHA-512 hash of a binary string.

```
sha512(expression)
```

**Arguments**

* **expression**: String expression to operate on. Can be a constant, column, or function, and any combination of string operators.


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