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# SHA512

An implementation of Secure Hashing Algorithm 2 (SHA-2) hashing with a
512-bit digest.

```
struct SHA512
```

## Overview

The [`SHA512`](/documentation/CryptoKit/SHA512) hash implements the [`HashFunction`](/documentation/CryptoKit/HashFunction) protocol for the
specific case of SHA-2 hashing with a 512-bit digest ([`SHA512Digest`](/documentation/CryptoKit/SHA512Digest)).
Larger digests take more space but are more secure.

You can compute the digest by calling the static `hash(data:)` method
once. Alternatively, if the data that you want to hash is too large to fit
in memory, you can compute the digest iteratively by creating a new hash
instance, calling the `update(data:)` method repeatedly with blocks of
data, and then calling the [`finalize()`](/documentation/CryptoKit/SHA512/finalize()) method to get the result.

## Topics

### Specifying the output type

[`SHA512.Digest`](/documentation/CryptoKit/SHA512/Digest)

The digest type for a SHA512 hash function.

[`SHA512Digest`](/documentation/CryptoKit/SHA512Digest)

The output of a Secure Hashing Algorithm 2 (SHA-2) hash with a 512-bit digest.

### Computing a hash in one call

### Computing a hash iteratively

[`init()`](/documentation/CryptoKit/SHA512/init())

Creates a SHA512 hash function.

[`update(bufferPointer:)`](/documentation/CryptoKit/SHA512/update(bufferPointer:))

Incrementally updates the hash function with the contents of the buffer.

[`finalize()`](/documentation/CryptoKit/SHA512/finalize())

Finalizes the hash function and returns the computed digest.

### Inspecting hash information

[`byteCount`](/documentation/CryptoKit/SHA512/byteCount)

The number of bytes in a SHA512 digest.

[`blockByteCount`](/documentation/CryptoKit/SHA512/blockByteCount)

The number of bytes that represents the hash function’s internal state.


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