# Function ring::hkdf::extract_and_expand [−] [src]

    pub fn extract_and_expand(
        salt: &SigningKey,
        secret: &[u8],
        info: &[u8],
        out: &mut [u8]
    )

Fills `out` with the output of the HKDF Extract-and-Expand operation for the given inputs.

`extract_and_expand` is exactly equivalent to:

    let prk = hkdf::extract(salt, secret);
    hkdf::expand(&prk, info, out)

See the documentation for `extract` and `expand` for details.

# Panics

`extract_and_expand` panics if `expand` panics.

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