+#define RSA_METHOD_FLAG_NO_CHECK 0x0001 /* don't check pub/private match */
+
+#define RSA_FLAG_CACHE_PUBLIC 0x0002
+#define RSA_FLAG_CACHE_PRIVATE 0x0004
+#define RSA_FLAG_BLINDING 0x0008
+#define RSA_FLAG_THREAD_SAFE 0x0010
+/* This flag means the private key operations will be handled by rsa_mod_exp
+ * and that they do not depend on the private key components being present:
+ * for example a key stored in external hardware. Without this flag bn_mod_exp
+ * gets called when private key components are absent.
+ */
+#define RSA_FLAG_EXT_PKEY 0x0020
+
+/* This flag in the RSA_METHOD enables the new rsa_sign, rsa_verify functions.
+ */
+#define RSA_FLAG_SIGN_VER 0x0040
+
+#define RSA_FLAG_NO_BLINDING 0x0080 /* new with 0.9.6j and 0.9.7b; the built-in
+ * RSA implementation now uses blinding by
+ * default (ignoring RSA_FLAG_BLINDING),
+ * but other engines might not need it
+ */
+#define RSA_FLAG_NO_CONSTTIME 0x0100 /* new with 0.9.8f; the built-in RSA
+ * implementation now uses constant time
+ * operations by default in private key operations,
+ * e.g., constant time modular exponentiation,
+ * modular inverse without leaking branches,
+ * division without leaking branches. This
+ * flag disables these constant time
+ * operations and results in faster RSA
+ * private key operations.
+ */
+#ifndef OPENSSL_NO_DEPRECATED
+#define RSA_FLAG_NO_EXP_CONSTTIME RSA_FLAG_NO_CONSTTIME /* deprecated name for the flag*/
+ /* new with 0.9.7h; the built-in RSA
+ * implementation now uses constant time
+ * modular exponentiation for secret exponents
+ * by default. This flag causes the
+ * faster variable sliding window method to
+ * be used for all exponents.
+ */
+#endif
+
+
+#define EVP_PKEY_CTX_set_rsa_padding(ctx, pad) \
+ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_RSA, -1, EVP_PKEY_CTRL_RSA_PADDING, \
+ pad, NULL)
+
+#define EVP_PKEY_CTX_set_rsa_pss_saltlen(ctx, len) \
+ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_RSA, \
+ (EVP_PKEY_OP_SIGN|EVP_PKEY_OP_VERIFY), \
+ EVP_PKEY_CTRL_RSA_PSS_SALTLEN, \
+ len, NULL)
+
+#define EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, bits) \
+ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_RSA, EVP_PKEY_OP_KEYGEN, \
+ EVP_PKEY_CTRL_RSA_KEYGEN_BITS, bits, NULL)