Add support for RSA_R_OAEP_DECODING_ERROR error flag.
diff --git a/src/_cffi_src/openssl/err.py b/src/_cffi_src/openssl/err.py
index 6ec1377..3eb783e 100644
--- a/src/_cffi_src/openssl/err.py
+++ b/src/_cffi_src/openssl/err.py
@@ -14,6 +14,7 @@
 static const int Cryptography_HAS_098C_CAMELLIA_CODES;
 static const int Cryptography_HAS_EC_CODES;
 static const int Cryptography_HAS_RSA_R_PKCS_DECODING_ERROR;
+static const int Cryptography_HAS_RSA_R_OAEP_DECODING_ERROR;
 
 struct ERR_string_data_st {
     unsigned long error;
@@ -230,6 +231,7 @@
 static const int RSA_R_BLOCK_TYPE_IS_NOT_01;
 static const int RSA_R_BLOCK_TYPE_IS_NOT_02;
 static const int RSA_R_PKCS_DECODING_ERROR;
+static const int RSA_R_OAEP_DECODING_ERROR;
 static const int RSA_F_RSA_SIGN;
 """
 
@@ -334,4 +336,11 @@
 static const long Cryptography_HAS_RSA_R_PKCS_DECODING_ERROR = 0;
 static const long RSA_R_PKCS_DECODING_ERROR = 0;
 #endif
+
+#ifdef RSA_R_OAEP_DECODING_ERROR
+static const long Cryptography_HAS_RSA_R_OAEP_DECODING_ERROR = 1;
+#else
+static const long Cryptography_HAS_RSA_R_OAEP_DECODING_ERROR = 0;
+static const long RSA_R_OAEP_DECODING_ERROR = 0;
+#endif
 """
diff --git a/src/cryptography/hazmat/backends/openssl/rsa.py b/src/cryptography/hazmat/backends/openssl/rsa.py
index 664f6d3..1be6f05 100644
--- a/src/cryptography/hazmat/backends/openssl/rsa.py
+++ b/src/cryptography/hazmat/backends/openssl/rsa.py
@@ -142,6 +142,9 @@
         if backend._lib.Cryptography_HAS_RSA_R_PKCS_DECODING_ERROR:
             decoding_errors.append(backend._lib.RSA_R_PKCS_DECODING_ERROR)
 
+        if backend._lib.Cryptography_HAS_RSA_R_OAEP_DECODING_ERROR:
+            decoding_errors.append(backend._lib.RSA_R_OAEP_DECODING_ERROR)
+
         assert errors[0].reason in decoding_errors
         raise ValueError("Decryption failed.")
 
diff --git a/src/cryptography/hazmat/bindings/openssl/_conditional.py b/src/cryptography/hazmat/bindings/openssl/_conditional.py
index 206c291..c4e39db 100644
--- a/src/cryptography/hazmat/bindings/openssl/_conditional.py
+++ b/src/cryptography/hazmat/bindings/openssl/_conditional.py
@@ -219,6 +219,9 @@
     "Cryptography_HAS_RSA_R_PKCS_DECODING_ERROR": [
         "RSA_R_PKCS_DECODING_ERROR"
     ],
+    "Cryptography_HAS_RSA_R_OAEP_DECODING_ERROR": [
+        "RSA_R_OAEP_DECODING_ERROR"
+    ],
     "Cryptography_HAS_GCM": [
         "EVP_CTRL_GCM_GET_TAG",
         "EVP_CTRL_GCM_SET_TAG",