23 /// An HKDF algorithm.
25 pub struct Algorithm(hmac::Algorithm);  struct
27 impl Algorithm {  implementation
28     /// The underlying HMAC algorithm.
30     pub fn hmac_algorithm(&self) -> hmac::Algorithm {  in hmac_algorithm()  argument
36 pub static HKDF_SHA1_FOR_LEGACY_USE_ONLY: Algorithm =
37     Algorithm(hmac::HMAC_SHA1_FOR_LEGACY_USE_ONLY);
40 pub static HKDF_SHA256: Algorithm = Algorithm(hmac::HMAC_SHA256);
43 pub static HKDF_SHA384: Algorithm = Algorithm(hmac::HMAC_SHA384);
46 pub static HKDF_SHA512: Algorithm = Algorithm(hmac::HMAC_SHA512);
48 impl KeyType for Algorithm {  implementation
60     /// algorithm.
64     pub fn new(algorithm: Algorithm, value: &[u8]) -> Self {  in new()  argument
65         Salt(hmac::Key::new(algorithm.0, value))  in new()
80         Prk(hmac::Key::new(salt.algorithm(), prk.as_ref()))  in extract()
83     /// The algorithm used to derive this salt.
85     pub fn algorithm(&self) -> Algorithm {  in algorithm()  argument
86         Algorithm(self.0.algorithm())  in algorithm()
90 impl From<Okm<'_, Algorithm>> for Salt {
91     fn from(okm: Okm<'_, Algorithm>) -> Self {  in from()
117     pub fn new_less_safe(algorithm: Algorithm, value: &[u8]) -> Self {  in new_less_safe()  argument
118         Self(hmac::Key::new(algorithm.hmac_algorithm(), value))  in new_less_safe()
133         if len_cached > 255 * self.0.algorithm().digest_algorithm().output_len {  in expand()
145 impl From<Okm<'_, Algorithm>> for Prk {
146     fn from(okm: Okm<Algorithm>) -> Self {  in from()
179     /// times the size of the digest algorithm's output. (This is the limit
198     let digest_alg = prk.0.algorithm().digest_algorithm();  in fill_okm()