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HKDF: Make maximum output length check safer and lazier.

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This commit is contained in:
Brian Smith 2019-03-29 13:45:51 -10:00
parent f1d85e614b
commit ef63a49f96
1 changed files with 1 additions and 2 deletions
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3
src/hkdf.rs
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@ -84,7 +84,6 @@ impl Prk {
pub fn expand(&self, info: &[u8], out: &mut [u8]) {
let prk = &self.0;
let digest_alg = prk.digest_algorithm();
assert!(out.len() <= 255 * digest_alg.output_len);
assert!(digest_alg.block_len >= digest_alg.output_len);
let mut ctx = hmac::SigningContext::with_key(prk);
@ -115,7 +114,7 @@ impl Prk {
ctx = hmac::SigningContext::with_key(prk);
ctx.update(t);
n += 1;
n = n.checked_add(1).unwrap();
}
}
}