diff --git a/openssl/src/lib.rs b/openssl/src/lib.rs
index 7829b79cba5f2940d705bce6e89d672e126a135f..c2c390cc1b303794484154e3e860a7d8c988913a 100644
--- a/openssl/src/lib.rs
+++ b/openssl/src/lib.rs
@@ -165,7 +165,6 @@ pub mod nid;
 #[cfg(not(any(boringssl, osslconf = "OPENSSL_NO_OCSP")))]
 pub mod ocsp;
 pub mod pkcs12;
-#[cfg(not(boringssl))]
 pub mod pkcs5;
 #[cfg(not(boringssl))]
 pub mod pkcs7;
diff --git a/openssl/src/pkcs5.rs b/openssl/src/pkcs5.rs
index c15ce477613e41d2fcd4bb5f1302644e1e543056..cd704e8256c2d509955e811c888789c19a8a180b 100644
--- a/openssl/src/pkcs5.rs
+++ b/openssl/src/pkcs5.rs
@@ -1,9 +1,13 @@
+#[cfg(not(boringssl))]
 use libc::c_int;
+use std::convert::TryInto;
+#[cfg(not(boringssl))]
 use std::ptr;
 
 use crate::cvt;
 use crate::error::ErrorStack;
 use crate::hash::MessageDigest;
+#[cfg(not(boringssl))]
 use crate::symm::Cipher;
 use openssl_macros::corresponds;
 
@@ -25,6 +29,7 @@ pub struct KeyIvPair {
 /// `pbkdf2_hmac` or another more modern key derivation algorithm.
 #[corresponds(EVP_BytesToKey)]
 #[allow(clippy::useless_conversion)]
+#[cfg(not(boringssl))]
 pub fn bytes_to_key(
     cipher: Cipher,
     digest: MessageDigest,
@@ -91,19 +96,15 @@ pub fn pbkdf2_hmac(
     key: &mut [u8],
 ) -> Result<(), ErrorStack> {
     unsafe {
-        assert!(pass.len() <= c_int::max_value() as usize);
-        assert!(salt.len() <= c_int::max_value() as usize);
-        assert!(key.len() <= c_int::max_value() as usize);
-
         ffi::init();
         cvt(ffi::PKCS5_PBKDF2_HMAC(
             pass.as_ptr() as *const _,
-            pass.len() as c_int,
+            pass.len().try_into().unwrap(),
             salt.as_ptr(),
-            salt.len() as c_int,
-            iter as c_int,
+            salt.len().try_into().unwrap(),
+            iter.try_into().unwrap(),
             hash.as_ptr(),
-            key.len() as c_int,
+            key.len().try_into().unwrap(),
             key.as_mut_ptr(),
         ))
         .map(|_| ())
@@ -114,7 +115,8 @@ pub fn pbkdf2_hmac(
 ///
 /// Requires OpenSSL 1.1.0 or newer.
 #[corresponds(EVP_PBE_scrypt)]
-#[cfg(any(ossl110))]
+#[cfg(any(ossl110, boringssl))]
+#[allow(clippy::useless_conversion)]
 pub fn scrypt(
     pass: &[u8],
     salt: &[u8],
@@ -134,7 +136,7 @@ pub fn scrypt(
             n,
             r,
             p,
-            maxmem,
+            maxmem.try_into().unwrap(),
             key.as_mut_ptr() as *mut _,
             key.len(),
         ))
@@ -145,6 +147,7 @@ pub fn scrypt(
 #[cfg(test)]
 mod tests {
     use crate::hash::MessageDigest;
+    #[cfg(not(boringssl))]
     use crate::symm::Cipher;
 
     // Test vectors from
@@ -246,6 +249,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg(not(boringssl))]
     fn bytes_to_key() {
         let salt = [16_u8, 34_u8, 19_u8, 23_u8, 141_u8, 4_u8, 207_u8, 221_u8];
 
@@ -282,7 +286,7 @@ mod tests {
     }
 
     #[test]
-    #[cfg(any(ossl110))]
+    #[cfg(any(ossl110, boringssl))]
     fn scrypt() {
         let pass = "pleaseletmein";
         let salt = "SodiumChloride";