diff --git a/openssl/src/aes.rs b/openssl/src/aes.rs
index 4a71d2e0..ab4e36fd 100644
--- a/openssl/src/aes.rs
+++ b/openssl/src/aes.rs
@@ -59,8 +59,6 @@ use ffi;
 use libc::{c_int, c_uint, size_t};
 use std::{mem, ptr};
 
-use symm::Mode;
-
 /// Provides Error handling for parsing keys.
 #[derive(Debug)]
 pub struct KeyError(());
@@ -119,37 +117,6 @@ impl AesKey {
     }
 }
 
-/// Performs AES IGE encryption or decryption
-///
-/// AES IGE (Infinite Garble Extension) is a form of AES block cipher utilized in
-/// OpenSSL.  Infinite Garble referes to propogating forward errors.  IGE, like other
-/// block ciphers implemented for AES requires an initalization vector.  The IGE mode
-/// allows a stream of blocks to be encrypted or decrypted without having the entire
-/// plaintext available.  For more information, visit [AES IGE Encryption].
-///
-/// This block cipher uses 16 byte blocks.  The rust implmentation will panic
-/// if the input or output does not meet this 16-byte boundry.  Attention must
-/// be made in this low level implementation to pad the value to the 128-bit boundry.
-///
-/// [AES IGE Encryption]: http://www.links.org/files/openssl-ige.pdf
-///
-/// # Panics
-///
-/// Panics if `in_` is not the same length as `out`, if that length is not a multiple of 16, or if
-/// `iv` is not at least 32 bytes.
-pub fn aes_ige(in_: &[u8], out: &mut [u8], key: &AesKey, iv: &mut [u8], mode: Mode) {
-    unsafe {
-        assert!(in_.len() == out.len());
-        assert!(in_.len() % ffi::AES_BLOCK_SIZE as usize == 0);
-        assert!(iv.len() >= ffi::AES_BLOCK_SIZE as usize * 2);
-
-        let mode = match mode {
-            Mode::Encrypt => ffi::AES_ENCRYPT,
-            Mode::Decrypt => ffi::AES_DECRYPT,
-        };
-    }
-}
-
 /// Wrap a key, according to [RFC 3394](https://tools.ietf.org/html/rfc3394)
 ///
 /// * `key`: The key-encrypting-key to use. Must be a encrypting key
diff --git a/openssl/src/bio.rs b/openssl/src/bio.rs
index 4c2f1ff2..51724e3f 100644
--- a/openssl/src/bio.rs
+++ b/openssl/src/bio.rs
@@ -66,10 +66,6 @@ impl MemBio {
             slice::from_raw_parts(ptr as *const _ as *const _, len as usize)
         }
     }
-
-    pub unsafe fn from_ptr(bio: *mut ffi::BIO) -> MemBio {
-        MemBio(bio)
-    }
 }
 
 cfg_if! {
diff --git a/openssl/src/dsa.rs b/openssl/src/dsa.rs
index 6889f361..875552bb 100644
--- a/openssl/src/dsa.rs
+++ b/openssl/src/dsa.rs
@@ -7,7 +7,7 @@
 
 use ffi;
 use foreign_types::{ForeignType, ForeignTypeRef};
-use libc::{c_int, c_uint};
+use libc::c_uint;
 use std::fmt;
 use std::mem;
 use std::ptr;
diff --git a/openssl/src/error.rs b/openssl/src/error.rs
index 9aea94de..2876ac83 100644
--- a/openssl/src/error.rs
+++ b/openssl/src/error.rs
@@ -15,7 +15,7 @@
 //!     Err(e) => println!("Parsing Error: {:?}", e),
 //! }
 //! ```
-use libc::{c_char, c_uint, c_ulong};
+use libc::{c_char, c_uint};
 use std::borrow::Cow;
 use std::error;
 use std::ffi::CStr;
diff --git a/openssl/src/pkcs7.rs b/openssl/src/pkcs7.rs
index c6249dd8..ccb897a5 100644
--- a/openssl/src/pkcs7.rs
+++ b/openssl/src/pkcs7.rs
@@ -1,4 +1,4 @@
-use bio::{MemBio, MemBioSlice};
+use bio::MemBioSlice;
 use error::ErrorStack;
 use ffi;
 use foreign_types::ForeignTypeRef;
@@ -6,8 +6,6 @@ use libc::c_int;
 use pkey::{HasPrivate, PKeyRef};
 use stack::StackRef;
 use std::ptr;
-use symm::Cipher;
-use x509::store::X509StoreRef;
 use x509::{X509Ref, X509};
 use {cvt, cvt_p};
 
diff --git a/openssl/src/pkey.rs b/openssl/src/pkey.rs
index 7ff28a63..f5688bb7 100644
--- a/openssl/src/pkey.rs
+++ b/openssl/src/pkey.rs
@@ -59,8 +59,6 @@ use dsa::Dsa;
 use ec::EcKey;
 use error::ErrorStack;
 use rsa::Rsa;
-#[cfg(ossl110)]
-use symm::Cipher;
 use util::{invoke_passwd_cb, CallbackState};
 use {cvt, cvt_p};
 
@@ -393,28 +391,6 @@ impl<T> PKey<T> {
 }
 
 impl PKey<Private> {
-    #[cfg(ossl110)]
-    fn generate_eddsa(nid: c_int) -> Result<PKey<Private>, ErrorStack> {
-        unsafe {
-            let kctx = cvt_p(ffi::EVP_PKEY_CTX_new_id(nid, ptr::null_mut()))?;
-            let ret = cvt(ffi::EVP_PKEY_keygen_init(kctx));
-            if let Err(e) = ret {
-                ffi::EVP_PKEY_CTX_free(kctx);
-                return Err(e);
-            }
-            let mut key = ptr::null_mut();
-            let ret = cvt(ffi::EVP_PKEY_keygen(kctx, &mut key));
-
-            ffi::EVP_PKEY_CTX_free(kctx);
-
-            if let Err(e) = ret {
-                return Err(e);
-            }
-
-            Ok(PKey::from_ptr(key))
-        }
-    }
-
     /// Generates a new private Ed25519 key
     #[cfg(ossl111)]
     pub fn generate_x25519() -> Result<PKey<Private>, ErrorStack> {
diff --git a/openssl/src/ssl/callbacks.rs b/openssl/src/ssl/callbacks.rs
index 2fcf8aac..5d35b0f6 100644
--- a/openssl/src/ssl/callbacks.rs
+++ b/openssl/src/ssl/callbacks.rs
@@ -480,66 +480,6 @@ where
     (*callback)(ssl, slice) as c_int
 }
 
-pub extern "C" fn raw_cookie_generate<F>(
-    ssl: *mut ffi::SSL,
-    cookie: *mut c_uchar,
-    cookie_len: *mut c_uint,
-) -> c_int
-where
-    F: Fn(&mut SslRef, &mut [u8]) -> Result<usize, ErrorStack> + 'static + Sync + Send,
-{
-    pub const DTLS1_COOKIE_LENGTH: c_uint = 256;
-
-    unsafe {
-        let ssl = SslRef::from_ptr_mut(ssl);
-        let callback = ssl
-            .ssl_context()
-            .ex_data(SslContext::cached_ex_index::<F>())
-            .expect("BUG: cookie generate callback missing") as *const F;
-        // We subtract 1 from DTLS1_COOKIE_LENGTH as the ostensible value, 256, is erroneous but retained for
-        // compatibility. See comments in dtls1.h.
-        let slice = slice::from_raw_parts_mut(cookie as *mut u8, DTLS1_COOKIE_LENGTH as usize - 1);
-        match (*callback)(ssl, slice) {
-            Ok(len) => {
-                *cookie_len = len as c_uint;
-                1
-            }
-            Err(e) => {
-                e.put();
-                0
-            }
-        }
-    }
-}
-
-cfg_if! {
-    if #[cfg(any(ossl110, libressl280))] {
-        type CookiePtr = *const c_uchar;
-    } else {
-        type CookiePtr = *mut c_uchar;
-    }
-}
-
-pub extern "C" fn raw_cookie_verify<F>(
-    ssl: *mut ffi::SSL,
-    cookie: CookiePtr,
-    cookie_len: c_uint,
-) -> c_int
-where
-    F: Fn(&mut SslRef, &[u8]) -> bool + 'static + Sync + Send,
-{
-    unsafe {
-        let ssl = SslRef::from_ptr_mut(ssl);
-        let callback = ssl
-            .ssl_context()
-            .ex_data(SslContext::cached_ex_index::<F>())
-            .expect("BUG: cookie verify callback missing") as *const F;
-        let slice =
-            slice::from_raw_parts(cookie as *const c_uchar as *const u8, cookie_len as usize);
-        (*callback)(ssl, slice) as c_int
-    }
-}
-
 #[cfg(ossl111)]
 pub struct CustomExtAddState<T>(Option<T>);
 
diff --git a/openssl/src/ssl/mod.rs b/openssl/src/ssl/mod.rs
index 563f9c41..96ec4588 100644
--- a/openssl/src/ssl/mod.rs
+++ b/openssl/src/ssl/mod.rs
@@ -59,7 +59,7 @@
 //! ```
 use ffi;
 use foreign_types::{ForeignType, ForeignTypeRef, Opaque};
-use libc::{c_char, c_int, c_long, c_uchar, c_uint, c_ulong, c_void};
+use libc::{c_char, c_int, c_long, c_uchar, c_uint, c_void};
 use std::any::TypeId;
 use std::cmp;
 use std::collections::HashMap;
@@ -2999,7 +2999,7 @@ impl SslRef {
             let mut p = ptr::null();
             let len = ffi::SSL_get_tlsext_status_ocsp_resp(self.as_ptr(), &mut p);
 
-            if len < 0 {
+            if len == 0 {
                 None
             } else {
                 Some(slice::from_raw_parts(p as *const u8, len as usize))
diff --git a/openssl/src/stack.rs b/openssl/src/stack.rs
index 54e76169..043ee178 100644
--- a/openssl/src/stack.rs
+++ b/openssl/src/stack.rs
@@ -1,6 +1,6 @@
 use ffi;
 use foreign_types::{ForeignType, ForeignTypeRef, Opaque};
-use libc::{c_int, size_t};
+use libc::size_t;
 use std::borrow::Borrow;
 use std::convert::AsRef;
 use std::fmt;
@@ -10,7 +10,7 @@ use std::mem;
 use std::ops::{Deref, DerefMut, Index, IndexMut, Range};
 
 use error::ErrorStack;
-use {cvt, cvt_0, cvt_p};
+use {cvt_0, cvt_p};
 
 use ffi::{
     sk_free as OPENSSL_sk_free, sk_new_null as OPENSSL_sk_new_null, sk_num as OPENSSL_sk_num,
diff --git a/openssl/src/x509/mod.rs b/openssl/src/x509/mod.rs
index 103d7694..0aa75582 100644
--- a/openssl/src/x509/mod.rs
+++ b/openssl/src/x509/mod.rs
@@ -1514,6 +1514,7 @@ cfg_if! {
     }
 }
 
+#[allow(bad_style)]
 unsafe fn X509_OBJECT_free(x: *mut ffi::X509_OBJECT) {
     ffi::X509_OBJECT_free_contents(x);
     ffi::OPENSSL_free(x as *mut libc::c_void);