From ff903b0b663937e0959d434e06aff73e110a7b17 Mon Sep 17 00:00:00 2001
From: Pietro Danzi <danzipie@gmail.com>
Date: Tue, 17 Dec 2019 04:15:00 +0100
Subject: [PATCH] fix PBKDF2 example (#538)

---
 src/cryptography/encryption/pbkdf2.md | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/src/cryptography/encryption/pbkdf2.md b/src/cryptography/encryption/pbkdf2.md
index f53e52f..3654e0a 100644
--- a/src/cryptography/encryption/pbkdf2.md
+++ b/src/cryptography/encryption/pbkdf2.md
@@ -17,10 +17,11 @@ use data_encoding::HEXUPPER;
 use ring::error::Unspecified;
 use ring::rand::SecureRandom;
 use ring::{digest, pbkdf2, rand};
+use std::num::NonZeroU32;
 
 fn main() -> Result<(), Unspecified> {
     const CREDENTIAL_LEN: usize = digest::SHA512_OUTPUT_LEN;
-    const N_ITER: u32 = 100_000;
+    let n_iter = NonZeroU32::new(100_000).unwrap();
     let rng = rand::SystemRandom::new();
 
     let mut salt = [0u8; CREDENTIAL_LEN];
@@ -29,8 +30,8 @@ fn main() -> Result<(), Unspecified> {
     let password = "Guess Me If You Can!";
     let mut pbkdf2_hash = [0u8; CREDENTIAL_LEN];
     pbkdf2::derive(
-        &digest::SHA512,
-        N_ITER,
+        pbkdf2::PBKDF2_HMAC_SHA512,
+        n_iter,
         &salt,
         password.as_bytes(),
         &mut pbkdf2_hash,
@@ -39,16 +40,16 @@ fn main() -> Result<(), Unspecified> {
     println!("PBKDF2 hash: {}", HEXUPPER.encode(&pbkdf2_hash));
 
     let should_succeed = pbkdf2::verify(
-        &digest::SHA512,
-		N_ITER,
+        pbkdf2::PBKDF2_HMAC_SHA512,
+        n_iter,
         &salt,
         password.as_bytes(),
         &pbkdf2_hash,
     );
     let wrong_password = "Definitely not the correct password";
     let should_fail = pbkdf2::verify(
-        &digest::SHA512,
-        N_ITER,
+        pbkdf2::PBKDF2_HMAC_SHA512,
+        n_iter,
         &salt,
         wrong_password.as_bytes(),
         &pbkdf2_hash,