diff --git a/src/_cffi_src/build_commoncrypto.py b/src/_cffi_src/build_commoncrypto.py
index 09e020a..373f6f7 100644
--- a/src/_cffi_src/build_commoncrypto.py
+++ b/src/_cffi_src/build_commoncrypto.py
@@ -25,6 +25,7 @@
         "secpolicy",
         "sectransform",
         "sectrust",
+        "secure_transport",
     ],
     extra_link_args=[
         "-framework", "Security", "-framework", "CoreFoundation"
diff --git a/src/_cffi_src/commoncrypto/secure_transport.py b/src/_cffi_src/commoncrypto/secure_transport.py
new file mode 100644
index 0000000..0ad1b0b
--- /dev/null
+++ b/src/_cffi_src/commoncrypto/secure_transport.py
@@ -0,0 +1,308 @@
+# This file is dual licensed under the terms of the Apache License, Version
+# 2.0, and the BSD License. See the LICENSE file in the root of this repository
+# for complete details.
+
+from __future__ import absolute_import, division, print_function
+
+INCLUDES = """
+#include <Security/SecureTransport.h>
+"""
+
+TYPES = """
+typedef ... *SSLContextRef;
+typedef const void *SSLConnectionRef;
+
+typedef enum {
+    kSSLSessionOptionBreakOnServerAuth,
+    kSSLSessionOptionBreakOnCertRequested,
+} SSLSessionOption;
+
+typedef enum {
+    kNeverAuthenticate,
+    kAlwaysAuthenticate,
+    kTryAuthenticate
+} SSLAuthenticate;
+
+typedef enum {
+    kSSLIdle,
+    kSSLHandshake,
+    kSSLConnected,
+    kSSLClosed,
+    kSSLAborted
+} SSLSessionState;
+
+typedef enum {
+    kSSLProtocolUnknown = 0,
+    kSSLProtocol3       = 2,
+    kTLSProtocol1       = 4,
+    /* DEPRECATED on iOS */
+    kSSLProtocol2       = 1,
+    kSSLProtocol3Only   = 3,
+    kTLSProtocol1Only   = 5,
+    kSSLProtocolAll     = 6,
+} SSLProtocol;
+
+typedef UInt32 SSLCipherSuite;
+enum {
+   SSL_NULL_WITH_NULL_NULL =               0x0000,
+   SSL_RSA_WITH_NULL_MD5 =                 0x0001,
+   SSL_RSA_WITH_NULL_SHA =                 0x0002,
+   SSL_RSA_EXPORT_WITH_RC4_40_MD5 =        0x0003,
+   SSL_RSA_WITH_RC4_128_MD5 =              0x0004,
+   SSL_RSA_WITH_RC4_128_SHA =              0x0005,
+   SSL_RSA_EXPORT_WITH_RC2_CBC_40_MD5 =    0x0006,
+   SSL_RSA_WITH_IDEA_CBC_SHA =             0x0007,
+   SSL_RSA_EXPORT_WITH_DES40_CBC_SHA =     0x0008,
+   SSL_RSA_WITH_DES_CBC_SHA =              0x0009,
+   SSL_RSA_WITH_3DES_EDE_CBC_SHA =         0x000A,
+   SSL_DH_DSS_EXPORT_WITH_DES40_CBC_SHA =  0x000B,
+   SSL_DH_DSS_WITH_DES_CBC_SHA =           0x000C,
+   SSL_DH_DSS_WITH_3DES_EDE_CBC_SHA =      0x000D,
+   SSL_DH_RSA_EXPORT_WITH_DES40_CBC_SHA =  0x000E,
+   SSL_DH_RSA_WITH_DES_CBC_SHA =           0x000F,
+   SSL_DH_RSA_WITH_3DES_EDE_CBC_SHA =      0x0010,
+   SSL_DHE_DSS_EXPORT_WITH_DES40_CBC_SHA = 0x0011,
+   SSL_DHE_DSS_WITH_DES_CBC_SHA =          0x0012,
+   SSL_DHE_DSS_WITH_3DES_EDE_CBC_SHA =     0x0013,
+   SSL_DHE_RSA_EXPORT_WITH_DES40_CBC_SHA = 0x0014,
+   SSL_DHE_RSA_WITH_DES_CBC_SHA =          0x0015,
+   SSL_DHE_RSA_WITH_3DES_EDE_CBC_SHA =     0x0016,
+   SSL_DH_anon_EXPORT_WITH_RC4_40_MD5 =    0x0017,
+   SSL_DH_anon_WITH_RC4_128_MD5 =          0x0018,
+   SSL_DH_anon_EXPORT_WITH_DES40_CBC_SHA = 0x0019,
+   SSL_DH_anon_WITH_DES_CBC_SHA =          0x001A,
+   SSL_DH_anon_WITH_3DES_EDE_CBC_SHA =     0x001B,
+   SSL_FORTEZZA_DMS_WITH_NULL_SHA =        0x001C,
+   SSL_FORTEZZA_DMS_WITH_FORTEZZA_CBC_SHA =0x001D,
+
+   /* TLS addenda using AES, per RFC 3268 */
+   TLS_RSA_WITH_AES_128_CBC_SHA      =     0x002F,
+   TLS_DH_DSS_WITH_AES_128_CBC_SHA   =     0x0030,
+   TLS_DH_RSA_WITH_AES_128_CBC_SHA   =     0x0031,
+   TLS_DHE_DSS_WITH_AES_128_CBC_SHA  =     0x0032,
+   TLS_DHE_RSA_WITH_AES_128_CBC_SHA  =     0x0033,
+   TLS_DH_anon_WITH_AES_128_CBC_SHA  =     0x0034,
+   TLS_RSA_WITH_AES_256_CBC_SHA      =     0x0035,
+   TLS_DH_DSS_WITH_AES_256_CBC_SHA   =     0x0036,
+   TLS_DH_RSA_WITH_AES_256_CBC_SHA   =     0x0037,
+   TLS_DHE_DSS_WITH_AES_256_CBC_SHA  =     0x0038,
+   TLS_DHE_RSA_WITH_AES_256_CBC_SHA  =     0x0039,
+   TLS_DH_anon_WITH_AES_256_CBC_SHA  =     0x003A,
+
+   /* ECDSA addenda, RFC 4492 */
+   TLS_ECDH_ECDSA_WITH_NULL_SHA           =    0xC001,
+   TLS_ECDH_ECDSA_WITH_RC4_128_SHA        =    0xC002,
+   TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA   =    0xC003,
+   TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA    =    0xC004,
+   TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA    =    0xC005,
+   TLS_ECDHE_ECDSA_WITH_NULL_SHA          =    0xC006,
+   TLS_ECDHE_ECDSA_WITH_RC4_128_SHA       =    0xC007,
+   TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA  =    0xC008,
+   TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA   =    0xC009,
+   TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA   =    0xC00A,
+   TLS_ECDH_RSA_WITH_NULL_SHA             =    0xC00B,
+   TLS_ECDH_RSA_WITH_RC4_128_SHA          =    0xC00C,
+   TLS_ECDH_RSA_WITH_3DES_EDE_CBC_SHA     =    0xC00D,
+   TLS_ECDH_RSA_WITH_AES_128_CBC_SHA      =    0xC00E,
+   TLS_ECDH_RSA_WITH_AES_256_CBC_SHA      =    0xC00F,
+   TLS_ECDHE_RSA_WITH_NULL_SHA            =    0xC010,
+   TLS_ECDHE_RSA_WITH_RC4_128_SHA         =    0xC011,
+   TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA    =    0xC012,
+   TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA     =    0xC013,
+   TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA     =    0xC014,
+   TLS_ECDH_anon_WITH_NULL_SHA            =    0xC015,
+   TLS_ECDH_anon_WITH_RC4_128_SHA         =    0xC016,
+   TLS_ECDH_anon_WITH_3DES_EDE_CBC_SHA    =    0xC017,
+   TLS_ECDH_anon_WITH_AES_128_CBC_SHA     =    0xC018,
+   TLS_ECDH_anon_WITH_AES_256_CBC_SHA     =    0xC019,
+
+   /* TLS 1.2 addenda, RFC 5246 */
+   /* Initial state. */
+   TLS_NULL_WITH_NULL_NULL                   = 0x0000,
+
+   /* Server provided RSA certificate for key exchange. */
+   TLS_RSA_WITH_NULL_MD5                     = 0x0001,
+   TLS_RSA_WITH_NULL_SHA                     = 0x0002,
+   TLS_RSA_WITH_RC4_128_MD5                  = 0x0004,
+   TLS_RSA_WITH_RC4_128_SHA                  = 0x0005,
+   TLS_RSA_WITH_3DES_EDE_CBC_SHA             = 0x000A,
+   TLS_RSA_WITH_NULL_SHA256                  = 0x003B,
+   TLS_RSA_WITH_AES_128_CBC_SHA256           = 0x003C,
+   TLS_RSA_WITH_AES_256_CBC_SHA256           = 0x003D,
+
+   /* Server-authenticated (and optionally client-authenticated)
+      Diffie-Hellman. */
+   TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA          = 0x000D,
+   TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA          = 0x0010,
+   TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA         = 0x0013,
+   TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA         = 0x0016,
+   TLS_DH_DSS_WITH_AES_128_CBC_SHA256        = 0x003E,
+   TLS_DH_RSA_WITH_AES_128_CBC_SHA256        = 0x003F,
+   TLS_DHE_DSS_WITH_AES_128_CBC_SHA256       = 0x0040,
+   TLS_DHE_RSA_WITH_AES_128_CBC_SHA256       = 0x0067,
+   TLS_DH_DSS_WITH_AES_256_CBC_SHA256        = 0x0068,
+   TLS_DH_RSA_WITH_AES_256_CBC_SHA256        = 0x0069,
+   TLS_DHE_DSS_WITH_AES_256_CBC_SHA256       = 0x006A,
+   TLS_DHE_RSA_WITH_AES_256_CBC_SHA256       = 0x006B,
+
+   /* Completely anonymous Diffie-Hellman */
+   TLS_DH_anon_WITH_RC4_128_MD5              = 0x0018,
+   TLS_DH_anon_WITH_3DES_EDE_CBC_SHA         = 0x001B,
+   TLS_DH_anon_WITH_AES_128_CBC_SHA256       = 0x006C,
+   TLS_DH_anon_WITH_AES_256_CBC_SHA256       = 0x006D,
+
+   /* Addenda from rfc 5288 AES Galois Counter Mode (GCM) Cipher Suites
+      for TLS. */
+   TLS_RSA_WITH_AES_128_GCM_SHA256           = 0x009C,
+   TLS_RSA_WITH_AES_256_GCM_SHA384           = 0x009D,
+   TLS_DHE_RSA_WITH_AES_128_GCM_SHA256       = 0x009E,
+   TLS_DHE_RSA_WITH_AES_256_GCM_SHA384       = 0x009F,
+   TLS_DH_RSA_WITH_AES_128_GCM_SHA256        = 0x00A0,
+   TLS_DH_RSA_WITH_AES_256_GCM_SHA384        = 0x00A1,
+   TLS_DHE_DSS_WITH_AES_128_GCM_SHA256       = 0x00A2,
+   TLS_DHE_DSS_WITH_AES_256_GCM_SHA384       = 0x00A3,
+   TLS_DH_DSS_WITH_AES_128_GCM_SHA256        = 0x00A4,
+   TLS_DH_DSS_WITH_AES_256_GCM_SHA384        = 0x00A5,
+   TLS_DH_anon_WITH_AES_128_GCM_SHA256       = 0x00A6,
+   TLS_DH_anon_WITH_AES_256_GCM_SHA384       = 0x00A7,
+
+   /* Addenda from rfc 5289  Elliptic Curve Cipher Suites with
+      HMAC SHA-256/384. */
+   TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256   = 0xC023,
+   TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384   = 0xC024,
+   TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA256    = 0xC025,
+   TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA384    = 0xC026,
+   TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256     = 0xC027,
+   TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384     = 0xC028,
+   TLS_ECDH_RSA_WITH_AES_128_CBC_SHA256      = 0xC029,
+   TLS_ECDH_RSA_WITH_AES_256_CBC_SHA384      = 0xC02A,
+
+   /* Addenda from rfc 5289  Elliptic Curve Cipher Suites with
+      SHA-256/384 and AES Galois Counter Mode (GCM) */
+   TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256   = 0xC02B,
+   TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384   = 0xC02C,
+   TLS_ECDH_ECDSA_WITH_AES_128_GCM_SHA256    = 0xC02D,
+   TLS_ECDH_ECDSA_WITH_AES_256_GCM_SHA384    = 0xC02E,
+   TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256     = 0xC02F,
+   TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384     = 0xC030,
+   TLS_ECDH_RSA_WITH_AES_128_GCM_SHA256      = 0xC031,
+   TLS_ECDH_RSA_WITH_AES_256_GCM_SHA384      = 0xC032,
+
+   /* RFC 5746 - Secure Renegotiation */
+   TLS_EMPTY_RENEGOTIATION_INFO_SCSV         = 0x00FF,
+
+   /*
+   * Tags for SSL 2 cipher kinds that are not specified
+   * for SSL 3.
+   */
+   SSL_RSA_WITH_RC2_CBC_MD5 =              0xFF80,
+   SSL_RSA_WITH_IDEA_CBC_MD5 =             0xFF81,
+   SSL_RSA_WITH_DES_CBC_MD5 =              0xFF82,
+   SSL_RSA_WITH_3DES_EDE_CBC_MD5 =         0xFF83,
+   SSL_NO_SUCH_CIPHERSUITE =               0xFFFF
+};
+
+typedef enum {
+    kSSLClientCertNone,
+    kSSLClientCertRequested,
+    kSSLClientCertSent,
+    kSSLClientCertRejected
+} SSLClientCertificateState;
+
+enum {
+    errSSLProtocol              = -9800,
+    errSSLNegotiation           = -9801,
+    errSSLFatalAlert            = -9802,
+    errSSLWouldBlock            = -9803,
+    errSSLSessionNotFound       = -9804,
+    errSSLClosedGraceful        = -9805,
+    errSSLClosedAbort           = -9806,
+    errSSLXCertChainInvalid     = -9807,
+    errSSLBadCert               = -9808,
+    errSSLCrypto                = -9809,
+    errSSLInternal              = -9810,
+    errSSLModuleAttach          = -9811,
+    errSSLUnknownRootCert       = -9812,
+    errSSLNoRootCert            = -9813,
+    errSSLCertExpired           = -9814,
+    errSSLCertNotYetValid       = -9815,
+    errSSLClosedNoNotify        = -9816,
+    errSSLBufferOverflow        = -9817,
+    errSSLBadCipherSuite        = -9818,
+    errSSLPeerUnexpectedMsg     = -9819,
+    errSSLPeerBadRecordMac      = -9820,
+    errSSLPeerDecryptionFail    = -9821,
+    errSSLPeerRecordOverflow    = -9822,
+    errSSLPeerDecompressFail    = -9823,
+    errSSLPeerHandshakeFail     = -9824,
+    errSSLPeerBadCert           = -9825,
+    errSSLPeerUnsupportedCert   = -9826,
+    errSSLPeerCertRevoked       = -9827,
+    errSSLPeerCertExpired       = -9828,
+    errSSLPeerCertUnknown       = -9829,
+    errSSLIllegalParam          = -9830,
+    errSSLPeerUnknownCA         = -9831,
+    errSSLPeerAccessDenied      = -9832,
+    errSSLPeerDecodeError       = -9833,
+    errSSLPeerDecryptError      = -9834,
+    errSSLPeerExportRestriction = -9835,
+    errSSLPeerProtocolVersion   = -9836,
+    errSSLPeerInsufficientSecurity = -9837,
+    errSSLPeerInternalError     = -9838,
+    errSSLPeerUserCancelled     = -9839,
+    errSSLPeerNoRenegotiation   = -9840,
+    errSSLServerAuthCompleted   = -9841,
+    errSSLClientCertRequested   = -9842,
+    errSSLHostNameMismatch      = -9843,
+    errSSLConnectionRefused     = -9844,
+    errSSLDecryptionFail        = -9845,
+    errSSLBadRecordMac          = -9846,
+    errSSLRecordOverflow        = -9847,
+    errSSLBadConfiguration      = -9848,
+    errSSLLast                  = -9849     /* end of range, to be deleted */
+};
+"""
+
+FUNCTIONS = """
+OSStatus SSLSetConnection(SSLContextRef, SSLConnectionRef);
+OSStatus SSLGetConnection(SSLContextRef, SSLConnectionRef *);
+OSStatus SSLSetSessionOption(SSLContextRef, SSLSessionOption, Boolean);
+OSStatus SSLSetClientSideAuthenticate(SSLContextRef, SSLAuthenticate);
+
+OSStatus SSLHandshake(SSLContextRef);
+OSStatus SSLGetSessionState(SSLContextRef, SSLSessionState *);
+OSStatus SSLGetNegotiatedProtocolVersion(SSLContextRef, SSLProtocol *);
+OSStatus SSLSetPeerID(SSLContextRef, const void *, size_t);
+OSStatus SSLGetPeerID(SSLContextRef, const void **, size_t *);
+OSStatus SSLGetBufferedReadSize(SSLContextRef, size_t *);
+OSStatus SSLRead(SSLContextRef, void *, size_t, size_t *);
+OSStatus SSLWrite(SSLContextRef, const void *, size_t, size_t *);
+OSStatus SSLClose(SSLContextRef);
+
+OSStatus SSLGetNumberSupportedCiphers(SSLContextRef, size_t *);
+OSStatus SSLGetSupportedCiphers(SSLContextRef, SSLCipherSuite *, size_t *);
+OSStatus SSLSetEnabledCiphers(SSLContextRef, const SSLCipherSuite *, size_t);
+OSStatus SSLGetNumberEnabledCiphers(SSLContextRef, size_t *);
+OSStatus SSLGetEnabledCiphers(SSLContextRef, SSLCipherSuite *, size_t *);
+OSStatus SSLGetNegotiatedCipher(SSLContextRef, SSLCipherSuite *);
+OSStatus SSLSetDiffieHellmanParams(SSLContextRef, const void *, size_t);
+OSStatus SSLGetDiffieHellmanParams(SSLContextRef, const void **, size_t *);
+
+OSStatus SSLSetCertificateAuthorities(SSLContextRef, CFTypeRef, Boolean);
+OSStatus SSLCopyCertificateAuthorities(SSLContextRef, CFArrayRef *);
+OSStatus SSLCopyDistinguishedNames(SSLContextRef, CFArrayRef *);
+OSStatus SSLSetCertificate(SSLContextRef, CFArrayRef);
+OSStatus SSLGetClientCertificateState(SSLContextRef,
+                                      SSLClientCertificateState *);
+OSStatus SSLCopyPeerTrust(SSLContextRef, SecTrustRef *trust);
+
+OSStatus SSLSetPeerDomainName(SSLContextRef, const char *, size_t);
+OSStatus SSLGetPeerDomainNameLength(SSLContextRef, size_t *);
+OSStatus SSLGetPeerDomainName(SSLContextRef, char *, size_t *);
+"""
+
+MACROS = """
+"""
+
+CUSTOMIZATIONS = """
+"""