Provide RSA_pkey_ctx_ctrl().

This is a wrapper around EVP_PKEY_CTX_ctrl() which requires the key to be
either RSA or RSA-PSS.

From OpenSSL 1.1.1d.

ok tb@

3 files changed, 20 insertions, 2 deletions

diff --git a/src/lib/libcrypto/Symbols.list b/src/lib/libcrypto/Symbols.list
index e56bb9ca5c..4ec01fe9c8 100644
--- a/src/lib/libcrypto/Symbols.list
+++ b/src/lib/libcrypto/Symbols.list
@@ -2356,6 +2356,7 @@ RSA_padding_check_PKCS1_type_1
 RSA_padding_check_PKCS1_type_2
 RSA_padding_check_X931
 RSA_padding_check_none
+RSA_pkey_ctx_ctrl
 RSA_print
 RSA_print_fp
 RSA_private_decrypt
diff --git a/src/lib/libcrypto/rsa/rsa.h b/src/lib/libcrypto/rsa/rsa.h
index 2aa472f501..1672297266 100644
--- a/src/lib/libcrypto/rsa/rsa.h
+++ b/src/lib/libcrypto/rsa/rsa.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: rsa.h,v 1.40 2019/06/05 15:41:33 gilles Exp $ */
+/* $OpenBSD: rsa.h,v 1.41 2019/10/24 15:47:15 jsing Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -294,6 +294,8 @@ const RSA_METHOD *RSA_PKCS1_SSLeay(void);
 
 const RSA_METHOD *RSA_null_method(void);
 
+int RSA_pkey_ctx_ctrl(EVP_PKEY_CTX *ctx, int optype, int cmd, int p1, void *p2);
+
 RSA *d2i_RSAPublicKey(RSA **a, const unsigned char **in, long len);
 int i2d_RSAPublicKey(const RSA *a, unsigned char **out);
 extern const ASN1_ITEM RSAPublicKey_it;
diff --git a/src/lib/libcrypto/rsa/rsa_lib.c b/src/lib/libcrypto/rsa/rsa_lib.c
index 84e1dc7eaf..bf6865d260 100644
--- a/src/lib/libcrypto/rsa/rsa_lib.c
+++ b/src/lib/libcrypto/rsa/rsa_lib.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: rsa_lib.c,v 1.37 2018/04/14 07:09:21 tb Exp $ */
+/* $OpenBSD: rsa_lib.c,v 1.38 2019/10/24 15:47:15 jsing Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -63,9 +63,12 @@
 #include <openssl/bn.h>
 #include <openssl/crypto.h>
 #include <openssl/err.h>
+#include <openssl/evp.h>
 #include <openssl/lhash.h>
 #include <openssl/rsa.h>
 
+#include "evp_locl.h"
+
 #ifndef OPENSSL_NO_ENGINE
 #include <openssl/engine.h>
 #endif
@@ -365,3 +368,15 @@ RSA_set_flags(RSA *r, int flags)
 {
         r->flags |= flags;
 }
+
+int
+RSA_pkey_ctx_ctrl(EVP_PKEY_CTX *ctx, int optype, int cmd, int p1, void *p2)
+{
+        /* Return an error if the key type is not RSA or RSA-PSS. */
+        if (ctx != NULL && ctx->pmeth != NULL &&
+            ctx->pmeth->pkey_id != EVP_PKEY_RSA &&
+            ctx->pmeth->pkey_id != EVP_PKEY_RSA_PSS)
+                return -1;
+
+        return EVP_PKEY_CTX_ctrl(ctx, -1, optype, cmd, p1, p2);
+}