[PATCH] src/crypto.h src/userauth.c: Fix conditional RSA support

Most of libssh2 already has conditional support for RSA according to
the LIBSSH2_RSA crypto backend #define, but crypto.h and userauth.c
needed a few small fixes.

---
 src/crypto.h   |  2 ++
 src/userauth.c | 15 +++++++++++++++
 2 files changed, 17 insertions(+)
diff --git a/src/crypto.h b/src/crypto.h
index aa997a3..b15a122 100644
--- a/src/crypto.h
+++ b/src/crypto.h
@@ -58,6 +58,7 @@
 #include "mbedtls.h"
 #endif
 
+#if LIBSSH2_RSA
 int _libssh2_rsa_new(libssh2_rsa_ctx ** rsa,
                      const unsigned char *edata,
                      unsigned long elen,
@@ -92,6 +93,7 @@ int _libssh2_rsa_new_private_frommemory(libssh2_rsa_ctx ** rsa,
                                         LIBSSH2_SESSION * session,
                                         const char *filedata, size_t filedata_len,
                                         unsigned const char *passphrase);
+#endif
 
 #if LIBSSH2_DSA
 int _libssh2_dsa_new(libssh2_dsa_ctx ** dsa,
diff --git a/src/userauth.c b/src/userauth.c
index cdfa25e..226eb8b 100644
--- a/src/userauth.c
+++ b/src/userauth.c
@@ -786,6 +786,11 @@ userauth_hostbased_fromfile(LIBSSH2_SESSION *session,
 {
     int rc;
 
+#if !LIBSSH2_RSA
+    return _libssh2_error(session, LIBSSH2_ERROR_METHOD_NOT_SUPPORTED,
+                          "RSA is not supported by crypto backend");
+#endif
+
     if (session->userauth_host_state == libssh2_NB_state_idle) {
         const LIBSSH2_HOSTKEY_METHOD *privkeyobj;
         unsigned char *pubkeydata, *sig = NULL;
@@ -1378,6 +1383,11 @@ userauth_publickey_frommemory(LIBSSH2_SESSION *session,
     void *abstract = &privkey_file;
     int rc;
 
+#if !LIBSSH2_RSA
+    return _libssh2_error(session, LIBSSH2_ERROR_METHOD_NOT_SUPPORTED,
+                          "RSA is not supported by crypto backend");
+#endif
+
     privkey_file.filename = privatekeydata;
     privkey_file.passphrase = passphrase;
 
@@ -1435,6 +1445,11 @@ userauth_publickey_fromfile(LIBSSH2_SESSION *session,
     void *abstract = &privkey_file;
     int rc;
 
+#if !LIBSSH2_RSA
+    return _libssh2_error(session, LIBSSH2_ERROR_METHOD_NOT_SUPPORTED,
+                          "RSA is not supported by crypto backend");
+#endif
+
     privkey_file.filename = privatekey;
     privkey_file.passphrase = passphrase;
 
-- 
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