diff --git a/cryptography/hazmat/bindings/openssl/binding.py b/cryptography/hazmat/bindings/openssl/binding.py
index acf9d42..cc40a10 100644
--- a/cryptography/hazmat/bindings/openssl/binding.py
+++ b/cryptography/hazmat/bindings/openssl/binding.py
@@ -49,6 +49,7 @@
         "bignum",
         "bio",
         "cmac",
+        "cms",
         "conf",
         "crypto",
         "dh",
diff --git a/cryptography/hazmat/bindings/openssl/cms.py b/cryptography/hazmat/bindings/openssl/cms.py
new file mode 100644
index 0000000..acb6991
--- /dev/null
+++ b/cryptography/hazmat/bindings/openssl/cms.py
@@ -0,0 +1,95 @@
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from __future__ import absolute_import, division, print_function
+
+INCLUDES = """
+#ifndef OPENSSL_NO_CMS
+#include <openssl/cms.h>
+#endif
+"""
+
+TYPES = """
+static const long Cryptography_HAS_CMS;
+
+typedef ... CMS_ContentInfo;
+typedef ... CMS_SignerInfo;
+typedef ... CMS_CertificateChoices;
+typedef ... CMS_RevocationInfoChoice;
+typedef ... CMS_RecipientInfo;
+typedef ... CMS_ReceiptRequest;
+typedef ... CMS_Receipt;
+"""
+
+FUNCTIONS = """
+"""
+
+MACROS = """
+BIO *BIO_new_CMS(BIO *, CMS_ContentInfo *);
+int i2d_CMS_bio_stream(BIO *, CMS_ContentInfo *, BIO *, int);
+int PEM_write_bio_CMS_stream(BIO *, CMS_ContentInfo *, BIO *, int);
+int CMS_final(CMS_ContentInfo *, BIO *, BIO *, unsigned int);
+CMS_ContentInfo *CMS_sign(X509 *, EVP_PKEY *, Cryptography_STACK_OF_X509 *,
+                          BIO *, unsigned int);
+int CMS_verify(CMS_ContentInfo *, Cryptography_STACK_OF_X509 *, X509_STORE *,
+               BIO *, BIO *, unsigned int);
+CMS_ContentInfo *CMS_encrypt(Cryptography_STACK_OF_X509 *, BIO *,
+                             const EVP_CIPHER *, unsigned int);
+int CMS_decrypt(CMS_ContentInfo *, EVP_PKEY *, X509 *, BIO *, BIO *,
+                unsigned int);
+CMS_SignerInfo *CMS_add1_signer(CMS_ContentInfo *, X509 *, EVP_PKEY *,
+                                const EVP_MD *, unsigned int);
+"""
+
+CUSTOMIZATIONS = """
+#ifndef OPENSSL_NO_CMS
+static const long Cryptography_HAS_CMS = 1;
+#else
+static const long Cryptography_HAS_CMS = 0;
+typedef void CMS_ContentInfo;
+typedef void CMS_SignerInfo;
+typedef void CMS_CertificateChoices;
+typedef void CMS_RevocationInfoChoice;
+typedef void CMS_RecipientInfo;
+typedef void CMS_ReceiptRequest;
+typedef void CMS_Receipt;
+BIO *(*BIO_new_CMS)(BIO *, CMS_ContentInfo *) = NULL;
+int (*i2d_CMS_bio_stream)(BIO *, CMS_ContentInfo *, BIO *, int) = NULL;
+int (*PEM_write_bio_CMS_stream)(BIO *, CMS_ContentInfo *, BIO *, int) = NULL;
+int (*CMS_final)(CMS_ContentInfo *, BIO *, BIO *, unsigned int) = NULL;
+CMS_ContentInfo *(*CMS_sign)(X509 *, EVP_PKEY *, Cryptography_STACK_OF_X509 *,
+                             BIO *, unsigned int) = NULL;
+int (*CMS_verify)(CMS_ContentInfo *, Cryptography_STACK_OF_X509 *,
+                  X509_STORE *, BIO *, BIO *, unsigned int) = NULL;
+CMS_ContentInfo *(*CMS_encrypt)(Cryptography_STACK_OF_X509 *, BIO *,
+                                const EVP_CIPHER *, unsigned int) = NULL;
+int (*CMS_decrypt)(CMS_ContentInfo *, EVP_PKEY *, X509 *, BIO *, BIO *,
+                   unsigned int) = NULL;
+CMS_SignerInfo *(*CMS_add1_signer)(CMS_ContentInfo *, X509 *, EVP_PKEY *,
+                                   const EVP_MD *, unsigned int) = NULL;
+#endif
+"""
+
+CONDITIONAL_NAMES = {
+    "Cryptography_HAS_CMS": [
+        "BIO_new_CMS",
+        "i2d_CMS_bio_stream",
+        "PEM_write_bio_CMS_stream",
+        "CMS_final",
+        "CMS_sign",
+        "CMS_verify",
+        "CMS_encrypt",
+        "CMS_decrypt",
+        "CMS_add1_signer",
+    ]
+}