[−][src]Function ring::hkdf::expand
pub fn expand(prk: &SigningKey, info: &[u8], out: &mut [u8])
Fills out with the output of the HKDF-Expand operation for the given
inputs.
prk should be the return value of an earlier call to extract.
| Parameter | RFC 5869 Term |
|---|---|
| prk | PRK |
| info | info |
| out | OKM (Output Keying Material) |
| out.len() | L (Length of output keying material in bytes) |
Panics
expand panics if the requested output length is larger than 255 times the
size of the digest algorithm, i.e. if
out.len() > 255 * salt.digest_algorithm().output_len. This is the limit
imposed by the HKDF specification, and is necessary to prevent overflow of
the 8-bit iteration counter in the expansion step.