# module sha256


## Contents
- [Constants](#Constants)
- [hexhash](#hexhash)
- [hexhash_224](#hexhash_224)
- [new](#new)
- [new224](#new224)
- [sum](#sum)
- [sum224](#sum224)
- [sum256](#sum256)
- [Digest](#Digest)
  - [free](#free)
  - [reset](#reset)
  - [write](#write)
  - [sum](#sum)
  - [size](#size)
  - [block_size](#block_size)

## Constants
```v
const size = 32
```

The size of a SHA256 checksum in bytes.

[[Return to contents]](#Contents)

```v
const size224 = 28
```

The size of a SHA224 checksum in bytes.

[[Return to contents]](#Contents)

```v
const block_size = 64
```

The blocksize of SHA256 and SHA224 in bytes.

[[Return to contents]](#Contents)

## hexhash
```v
fn hexhash(s string) string
```

hexhash returns a hexadecimal SHA256 hash sum `string` of `s`.

Example
```v

assert sha256.hexhash('V') == 'de5a6f78116eca62d7fc5ce159d23ae6b889b365a1739ad2cf36f925a140d0cc'

```

[[Return to contents]](#Contents)

## hexhash_224
```v
fn hexhash_224(s string) string
```

hexhash_224 returns a hexadecimal SHA224 hash sum `string` of `s`.

[[Return to contents]](#Contents)

## new
```v
fn new() &Digest
```

new returns a new Digest (implementing hash.Hash) computing the SHA256 checksum.

[[Return to contents]](#Contents)

## new224
```v
fn new224() &Digest
```

new224 returns a new Digest (implementing hash.Hash) computing the SHA224 checksum.

[[Return to contents]](#Contents)

## sum
```v
fn sum(data []u8) []u8
```

sum returns the SHA256 checksum of the bytes in `data`.

Example
```v

assert sha256.sum('V'.bytes()).len > 0 == true

```

[[Return to contents]](#Contents)

## sum224
```v
fn sum224(data []u8) []u8
```

sum224 returns the SHA224 checksum of the data.

[[Return to contents]](#Contents)

## sum256
```v
fn sum256(data []u8) []u8
```

sum256 returns the SHA256 checksum of the data.

[[Return to contents]](#Contents)

## Digest
## free
```v
fn (mut d Digest) free()
```

free the resources taken by the Digest `d`

[[Return to contents]](#Contents)

## reset
```v
fn (mut d Digest) reset()
```

reset the state of the Digest `d`

[[Return to contents]](#Contents)

## write
```v
fn (mut d Digest) write(p_ []u8) !int
```

write writes the contents of `p_` to the internal hash representation.

[[Return to contents]](#Contents)

## sum
```v
fn (d &Digest) sum(b_in []u8) []u8
```

sum returns the SHA256 or SHA224 checksum of digest with the data.

[[Return to contents]](#Contents)

## size
```v
fn (d &Digest) size() int
```

size returns the size of the checksum in bytes.

[[Return to contents]](#Contents)

## block_size
```v
fn (d &Digest) block_size() int
```

block_size returns the block size of the checksum in bytes.

[[Return to contents]](#Contents)

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