Add stub functions for RSA-PSS keygen parameters.

These functions are used by Node.js in
https://github.com/nodejs/node/pull/26960. BoringSSL does not
support EVP_PKEY_RSA_PSS keys, so they always fail.

This simplifies building Node with BoringSSL.

Change-Id: I81c4cdba8791a60d965bc176d09e5c818153860c
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/38524
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>

crypto/evp/p_rsa.c

diff --git a/crypto/evp/p_rsa.c b/crypto/evp/p_rsa.c
index 852f4f6..7872a92 100644
--- a/crypto/evp/p_rsa.c
+++ b/crypto/evp/p_rsa.c
@@ -568,6 +568,19 @@
                            0, out_padding);
 }
 
+int EVP_PKEY_CTX_set_rsa_pss_keygen_md(EVP_PKEY_CTX *ctx, const EVP_MD *md) {
+  return 0;
+}
+
+int EVP_PKEY_CTX_set_rsa_pss_keygen_saltlen(EVP_PKEY_CTX *ctx, int salt_len) {
+  return 0;
+}
+
+int EVP_PKEY_CTX_set_rsa_pss_keygen_mgf1_md(EVP_PKEY_CTX *ctx,
+                                            const EVP_MD *md) {
+  return 0;
+}
+
 int EVP_PKEY_CTX_set_rsa_pss_saltlen(EVP_PKEY_CTX *ctx, int salt_len) {
   return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_RSA,
                            (EVP_PKEY_OP_SIGN | EVP_PKEY_OP_VERIFY),

include/openssl/evp.h

diff --git a/include/openssl/evp.h b/include/openssl/evp.h
index ad9c05e..19baa64 100644
--- a/include/openssl/evp.h
+++ b/include/openssl/evp.h
@@ -927,6 +927,18 @@
 // EVP_PKEY_base_id calls |EVP_PKEY_id|.
 OPENSSL_EXPORT int EVP_PKEY_base_id(const EVP_PKEY *pkey);
 
+// EVP_PKEY_CTX_set_rsa_pss_keygen_md returns 0.
+OPENSSL_EXPORT int EVP_PKEY_CTX_set_rsa_pss_keygen_md(EVP_PKEY_CTX *ctx,
+                                                      const EVP_MD *md);
+
+// EVP_PKEY_CTX_set_rsa_pss_keygen_saltlen returns 0.
+OPENSSL_EXPORT int EVP_PKEY_CTX_set_rsa_pss_keygen_saltlen(EVP_PKEY_CTX *ctx,
+                                                           int salt_len);
+
+// EVP_PKEY_CTX_set_rsa_pss_keygen_mgf1_md returns 0.
+OPENSSL_EXPORT int EVP_PKEY_CTX_set_rsa_pss_keygen_mgf1_md(EVP_PKEY_CTX *ctx,
+                                                           const EVP_MD *md);
+
 
 // Preprocessor compatibility section (hidden).
 //