2 files changed, 19 insertions, 0 deletions
diff --git a/src/cryptography/hazmat/backends/openssl/x509.py b/src/cryptography/hazmat/backends/openssl/x509.py
index a6f7d69e..c71f8d92 100644
--- a/src/cryptography/hazmat/backends/openssl/x509.py
+++ b/src/cryptography/hazmat/backends/openssl/x509.py
@@ -362,3 +362,16 @@ class _CertificateSigningRequest(object):
     @property
     def signature(self):
         return _asn1_string_to_bytes(self._backend, self._x509_req.signature)
+
+    @property
+    def is_signature_valid(self):
+        pkey = self._backend._lib.X509_REQ_get_pubkey(self._x509_req)
+        self._backend.openssl_assert(pkey != self._backend._ffi.NULL)
+        pkey = self._backend._ffi.gc(pkey, self._backend._lib.EVP_PKEY_free)
+        res = self._backend._lib.X509_REQ_verify(self._x509_req, pkey)
+
+        if res != 1:
+            self._backend._consume_errors()
+            return False
+
+        return True
diff --git a/src/cryptography/x509/base.py b/src/cryptography/x509/base.py
index 55e965f7..4a22ed02 100644
--- a/src/cryptography/x509/base.py
+++ b/src/cryptography/x509/base.py
@@ -288,6 +288,12 @@ class CertificateSigningRequest(object):
         2986.
         """
 
+    @abc.abstractproperty
+    def is_signature_valid(self):
+        """
+        Verifies signature of signing request.
+        """
+
 
 @six.add_metaclass(abc.ABCMeta)
 class RevokedCertificate(object):