diff --git a/Cargo.toml b/Cargo.toml
index 351e3133..09308c42 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,14 +11,14 @@ readme = "README.md"
 vendored = ["openssl/vendored"]
 
 [target.'cfg(any(target_os = "macos", target_os = "ios"))'.dependencies]
-security-framework = "0.3.1"
-security-framework-sys = "0.3.1"
+security-framework = {version = "0.3.1", features = ["OSX_10_12"]}
+security-framework-sys = {version = "0.3.1", features = ["OSX_10_12"]}
 lazy_static = "1.0"
 libc = "0.2"
 tempfile = "3.0"
 
 [target.'cfg(target_os = "windows")'.dependencies]
-schannel = "0.1.13"
+schannel = {version = "0.1.15"}
 
 [target.'cfg(not(any(target_os = "windows", target_os = "macos", target_os = "ios")))'.dependencies]
 log = "0.4.5"
diff --git a/src/imp/openssl.rs b/src/imp/openssl.rs
index 75264d24..34a0582e 100644
--- a/src/imp/openssl.rs
+++ b/src/imp/openssl.rs
@@ -9,7 +9,8 @@ use self::openssl::ssl::{
     self, MidHandshakeSslStream, SslAcceptor, SslConnector, SslContextBuilder, SslMethod,
     SslVerifyMode,
 };
-use self::openssl::x509::{X509, X509VerifyResult};
+use self::openssl::stack;
+use self::openssl::x509::{X509VerifyResult, X509};
 use std::error;
 use std::fmt;
 use std::io;
@@ -177,6 +178,12 @@ impl Certificate {
         let der = self.0.to_der()?;
         Ok(der)
     }
+
+    pub fn public_key_info_der(&self) -> Result<Vec<u8>, Error> {
+        let pk = self.0.public_key()?;
+        let der = pk.public_key_to_der()?;
+        Ok(der)
+    }
 }
 
 pub struct MidHandshakeTlsStream<S>(MidHandshakeSslStream<S>);
@@ -324,6 +331,19 @@ impl TlsAcceptor {
     }
 }
 
+pub struct ChainIterator<'a, S: 'a>(Option<stack::Iter<'a, X509>>, &'a TlsStream<S>);
+
+impl<'a, S> Iterator for ChainIterator<'a, S> {
+    type Item = Certificate;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        if let Some(i) = self.0.as_mut() {
+            return i.next().map(|c| Certificate(c.to_owned()));
+        }
+        None
+    }
+}
+
 pub struct TlsStream<S>(ssl::SslStream<S>);
 
 impl<S: fmt::Debug> fmt::Debug for TlsStream<S> {
@@ -349,6 +369,13 @@ impl<S: io::Read + io::Write> TlsStream<S> {
         Ok(self.0.ssl().peer_certificate().map(Certificate))
     }
 
+    pub fn certificate_chain(&mut self) -> Result<ChainIterator<S>, Error> {
+        Ok(ChainIterator(
+            self.0.ssl().peer_cert_chain().map(|stack| stack.iter()),
+            self,
+        ))
+    }
+
     pub fn tls_server_end_point(&self) -> Result<Option<Vec<u8>>, Error> {
         let cert = if self.0.ssl().is_server() {
             self.0.ssl().certificate().map(|x| x.to_owned())
diff --git a/src/imp/schannel.rs b/src/imp/schannel.rs
index fee17e89..fb059301 100644
--- a/src/imp/schannel.rs
+++ b/src/imp/schannel.rs
@@ -1,7 +1,7 @@
 extern crate schannel;
 
 use self::schannel::cert_context::{CertContext, HashAlgorithm};
-use self::schannel::cert_store::{CertAdd, CertStore, Memory, PfxImportOptions};
+use self::schannel::cert_store::{CertAdd, CertStore, Certs, Memory, PfxImportOptions};
 use self::schannel::schannel_cred::{Direction, Protocol, SchannelCred};
 use self::schannel::tls_stream;
 use std::error;
@@ -89,7 +89,8 @@ impl Identity {
                 return Err(io::Error::new(
                     io::ErrorKind::InvalidInput,
                     "No identity found in PKCS #12 archive",
-                ).into());
+                )
+                .into());
             }
         };
 
@@ -115,13 +116,18 @@ impl Certificate {
             Err(_) => Err(io::Error::new(
                 io::ErrorKind::InvalidInput,
                 "PEM representation contains non-UTF-8 bytes",
-            ).into()),
+            )
+            .into()),
         }
     }
 
     pub fn to_der(&self) -> Result<Vec<u8>, Error> {
         Ok(self.0.to_der().to_vec())
     }
+
+    pub fn public_key_info_der(&self) -> Result<Vec<u8>, Error> {
+        Ok(self.0.subject_public_key_info_der()?)
+    }
 }
 
 pub struct MidHandshakeTlsStream<S>(tls_stream::MidHandshakeTlsStream<S>);
@@ -149,7 +155,10 @@ where
 
     pub fn handshake(self) -> Result<TlsStream<S>, HandshakeError<S>> {
         match self.0.handshake() {
-            Ok(s) => Ok(TlsStream(s)),
+            Ok(stream) => Ok(TlsStream {
+                stream,
+                store: None,
+            }),
             Err(e) => Err(e.into()),
         }
     }
@@ -227,7 +236,10 @@ impl TlsConnector {
             builder.verify_callback(|_| Ok(()));
         }
         match builder.connect(cred, stream) {
-            Ok(s) => Ok(TlsStream(s)),
+            Ok(stream) => Ok(TlsStream {
+                stream,
+                store: None,
+            }),
             Err(e) => Err(e.into()),
         }
     }
@@ -259,46 +271,85 @@ impl TlsAcceptor {
         // FIXME we're probably missing the certificate chain?
         let cred = builder.acquire(Direction::Inbound)?;
         match tls_stream::Builder::new().accept(cred, stream) {
-            Ok(s) => Ok(TlsStream(s)),
+            Ok(stream) => Ok(TlsStream {
+                stream,
+                store: None,
+            }),
             Err(e) => Err(e.into()),
         }
     }
 }
 
-pub struct TlsStream<S>(tls_stream::TlsStream<S>);
+pub struct ChainIterator<'a, S: 'a> {
+    certs: Option<Certs<'a>>,
+    _stream: &'a TlsStream<S>,
+}
+impl<'a, S> Iterator for ChainIterator<'a, S> {
+    type Item = Certificate;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        if let Some(certs) = self.certs.as_mut() {
+            return certs.next().map(Certificate);
+        }
+        None
+    }
+}
+
+pub struct TlsStream<S> {
+    stream: tls_stream::TlsStream<S>,
+    store: Option<CertStore>,
+}
 
 impl<S: fmt::Debug> fmt::Debug for TlsStream<S> {
     fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
-        fmt::Debug::fmt(&self.0, fmt)
+        fmt::Debug::fmt(&self.stream, fmt)
     }
 }
 
 impl<S: io::Read + io::Write> TlsStream<S> {
     pub fn get_ref(&self) -> &S {
-        self.0.get_ref()
+        self.stream.get_ref()
     }
 
     pub fn get_mut(&mut self) -> &mut S {
-        self.0.get_mut()
+        self.stream.get_mut()
     }
 
     pub fn buffered_read_size(&self) -> Result<usize, Error> {
-        Ok(self.0.get_buf().len())
+        Ok(self.stream.get_buf().len())
     }
 
     pub fn peer_certificate(&self) -> Result<Option<Certificate>, Error> {
-        match self.0.peer_certificate() {
+        match self.stream.peer_certificate() {
             Ok(cert) => Ok(Some(Certificate(cert))),
             Err(ref e) if e.raw_os_error() == Some(SEC_E_NO_CREDENTIALS as i32) => Ok(None),
             Err(e) => Err(Error(e)),
         }
     }
 
+    pub fn certificate_chain(&mut self) -> Result<ChainIterator<S>, Error> {
+        if self.store.is_none() {
+            match self.stream.peer_certificate() {
+                Ok(cert) => {
+                    self.store = cert.cert_store();
+                }
+                Err(ref e) if e.raw_os_error() == Some(SEC_E_NO_CREDENTIALS as i32) => {
+                    self.store = None;
+                }
+                Err(e) => return Err(Error(e)),
+            }
+        }
+        Ok(ChainIterator {
+            certs: self.store.as_ref().map(|c| c.certs()),
+            _stream: self,
+        })
+    }
+
     pub fn tls_server_end_point(&self) -> Result<Option<Vec<u8>>, Error> {
-        let cert = if self.0.is_server() {
-            self.0.certificate()
+        let cert = if self.stream.is_server() {
+            self.stream.certificate()
         } else {
-            self.0.peer_certificate()
+            self.stream.peer_certificate()
         };
 
         let cert = match cert {
@@ -320,23 +371,23 @@ impl<S: io::Read + io::Write> TlsStream<S> {
     }
 
     pub fn shutdown(&mut self) -> io::Result<()> {
-        self.0.shutdown()?;
+        self.stream.shutdown()?;
         Ok(())
     }
 }
 
 impl<S: io::Read + io::Write> io::Read for TlsStream<S> {
     fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
-        self.0.read(buf)
+        self.stream.read(buf)
     }
 }
 
 impl<S: io::Read + io::Write> io::Write for TlsStream<S> {
     fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
-        self.0.write(buf)
+        self.stream.write(buf)
     }
 
     fn flush(&mut self) -> io::Result<()> {
-        self.0.flush()
+        self.stream.flush()
     }
 }
diff --git a/src/imp/security_framework.rs b/src/imp/security_framework.rs
index f23fe131..f9bd897b 100644
--- a/src/imp/security_framework.rs
+++ b/src/imp/security_framework.rs
@@ -3,18 +3,20 @@ extern crate security_framework;
 extern crate security_framework_sys;
 extern crate tempfile;
 
-use self::security_framework::base;
 use self::security_framework::certificate::SecCertificate;
 use self::security_framework::identity::SecIdentity;
 use self::security_framework::import_export::{ImportedIdentity, Pkcs12ImportOptions};
 use self::security_framework::secure_transport::{
     self, ClientBuilder, SslConnectionType, SslContext, SslProtocol, SslProtocolSide,
 };
+use self::security_framework::{base, trust::SecTrust};
 use self::security_framework_sys::base::errSecIO;
+
 use self::tempfile::TempDir;
 use std::error;
 use std::fmt;
 use std::io;
+
 use std::sync::Mutex;
 use std::sync::{Once, ONCE_INIT};
 
@@ -174,6 +176,10 @@ impl Certificate {
     pub fn to_der(&self) -> Result<Vec<u8>, Error> {
         Ok(self.0.to_der())
     }
+
+    pub fn public_key_info_der(&self) -> Result<Vec<u8>, Error> {
+        Ok(self.0.public_key_info_der()?.unwrap_or(Vec::new()))
+    }
 }
 
 pub enum HandshakeError<S> {
@@ -351,6 +357,24 @@ impl TlsAcceptor {
     }
 }
 
+pub struct ChainIterator<'a, S: 'a> {
+    trust: Option<SecTrust>,
+    pos: usize,
+    _stream: &'a TlsStream<S>,
+}
+impl<'a, S> Iterator for ChainIterator<'a, S> {
+    type Item = Certificate;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        if let Some(trust) = self.trust.as_ref() {
+            let pos = self.pos;
+            self.pos += 1;
+            return trust.certificate_at_index(pos as _).map(Certificate);
+        }
+        None
+    }
+}
+
 pub struct TlsStream<S> {
     stream: secure_transport::SslStream<S>,
     cert: Option<SecCertificate>,
@@ -385,6 +409,21 @@ impl<S: io::Read + io::Write> TlsStream<S> {
         Ok(trust.certificate_at_index(0).map(Certificate))
     }
 
+    pub fn certificate_chain(&mut self) -> Result<ChainIterator<S>, Error> {
+        let trust = match self.stream.context().peer_trust2()? {
+            Some(trust) => {
+                trust.evaluate()?;
+                Some(trust)
+            }
+            None => None,
+        };
+        Ok(ChainIterator {
+            trust,
+            pos: 0,
+            _stream: self,
+        })
+    }
+
     #[cfg(target_os = "ios")]
     pub fn tls_server_end_point(&self) -> Result<Option<Vec<u8>>, Error> {
         Ok(None)
diff --git a/src/lib.rs b/src/lib.rs
index 5efb08fc..bb08914e 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -206,6 +206,23 @@ impl Certificate {
         let der = self.0.to_der()?;
         Ok(der)
     }
+
+    /// Returns der encoded subjectPublicKeyInfo.
+    pub fn public_key_info_der(&self) -> Result<Vec<u8>> {
+        let der = self.0.public_key_info_der()?;
+        Ok(der)
+    }
+}
+
+/// An iterator over a certificate chain.
+pub struct ChainIterator<'a, S: 'a>(imp::ChainIterator<'a, S>);
+
+impl<'a, S> Iterator for ChainIterator<'a, S> {
+    type Item = Certificate;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.0.next().map(Certificate)
+    }
 }
 
 /// A TLS stream which has been interrupted midway through the handshake process.
@@ -630,6 +647,11 @@ impl<S: io::Read + io::Write> TlsStream<S> {
         Ok(self.0.peer_certificate()?.map(Certificate))
     }
 
+    /// Returns an iterator over certificate chain. It may be an empty iterator if chain not available.
+    pub fn certificate_chain(&mut self) -> Result<ChainIterator<S>> {
+        Ok(ChainIterator(self.0.certificate_chain()?))
+    }
+
     /// Returns the tls-server-end-point channel binding data as defined in [RFC 5929].
     ///
     /// [RFC 5929]: https://tools.ietf.org/html/rfc5929