Opaquify RSA and DSA structs in OpenSSL (#3016)

diff --git a/src/_cffi_src/openssl/dsa.py b/src/_cffi_src/openssl/dsa.py
index 5f0f649..16f00fe 100644
--- a/src/_cffi_src/openssl/dsa.py
+++ b/src/_cffi_src/openssl/dsa.py
@@ -9,19 +9,7 @@
 """
 
 TYPES = """
-typedef struct dsa_st {
-    /* Prime number (public) */
-    BIGNUM *p;
-    /* Subprime (160-bit, q | p-1, public) */
-    BIGNUM *q;
-    /* Generator of subgroup (public) */
-    BIGNUM *g;
-    /* Private key x */
-    BIGNUM *priv_key;
-    /* Public key y = g^x */
-    BIGNUM *pub_key;
-    ...;
-} DSA;
+typedef ... DSA;
 """
 
 FUNCTIONS = """
diff --git a/src/_cffi_src/openssl/rsa.py b/src/_cffi_src/openssl/rsa.py
index 6b3365d..79c968b 100644
--- a/src/_cffi_src/openssl/rsa.py
+++ b/src/_cffi_src/openssl/rsa.py
@@ -9,17 +9,7 @@
 """
 
 TYPES = """
-typedef struct rsa_st {
-    BIGNUM *n;
-    BIGNUM *e;
-    BIGNUM *d;
-    BIGNUM *p;
-    BIGNUM *q;
-    BIGNUM *dmp1;
-    BIGNUM *dmq1;
-    BIGNUM *iqmp;
-    ...;
-} RSA;
+typedef ... RSA;
 typedef ... BN_GENCB;
 static const int RSA_PKCS1_PADDING;
 static const int RSA_SSLV23_PADDING;