# Struct ring::digest::Context [−] [src]

    pub struct Context {
        pub algorithm: &'static Algorithm,
        // some fields omitted
    }

A context for multi-step (Init-Update-Finish) digest calculations.

C analog: `EVP_MD_CTX`.

# Examples

    use ring::digest;

    let one_shot = digest::digest(&digest::SHA384, b"hello, world");

    let mut ctx = digest::Context::new(&digest::SHA384);
    ctx.update(b"hello");
    ctx.update(b", ");
    ctx.update(b"world");
    let multi_part = ctx.finish();

    assert_eq!(&one_shot.as_ref(), &multi_part.as_ref());

## Fields

`algorithm: &'static Algorithm`

The context's algorithm.

## Methods

### `impl Context`
[src]

#### `fn new(algorithm: &'static Algorithm) -> Context`

Constructs a new context.

C analogs: `EVP_DigestInit`, `EVP_DigestInit_ex`

#### `fn update(&mut self, data: &[u8])`

Updates the digest with all the data in `data`. `update` may be called zero or more times until `finish` is called. It must not be called after `finish` has been called.

C analog: `EVP_DigestUpdate`

#### `fn finish(self) -> Digest`

Finalizes the digest calculation and returns the digest value. `finish` consumes the context so it cannot be (mis-)used after `finish` has been called.

C analogs: `EVP_DigestFinal`, `EVP_DigestFinal_ex`

#### `fn algorithm(&self) -> &'static Algorithm`

The algorithm that this context is using.

## Trait Implementations

### `impl Clone for Context`
[src]

#### `fn clone(&self) -> Context`

Returns a copy of the value. Read more

#### `fn clone_from(&mut self, source: &Self)`
1.0.0

Performs copy-assignment from `source`. Read more

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