> For the complete documentation index, see [llms.txt](https://docs.e6data.com/ingestion-engine/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.e6data.com/ingestion-engine/sql/functions/hashing.md).

# Hashing

*The e6 Ingestion 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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