diff --git a/dlls/bcrypt/bcrypt_internal.h b/dlls/bcrypt/bcrypt_internal.h
index eb136111509..fef1e4585ee 100644
--- a/dlls/bcrypt/bcrypt_internal.h
+++ b/dlls/bcrypt/bcrypt_internal.h
@@ -206,7 +206,7 @@ struct key_funcs
     void     (CDECL *key_symmetric_destroy)( struct key * );
     NTSTATUS (CDECL *key_asymmetric_init)( struct key * );
     NTSTATUS (CDECL *key_asymmetric_generate)( struct key * );
-    NTSTATUS (CDECL *key_asymmetric_decrypt)( struct key *, UCHAR *, ULONG, UCHAR *, ULONG * );
+    NTSTATUS (CDECL *key_asymmetric_decrypt)( struct key *, UCHAR *, ULONG, UCHAR *, ULONG, ULONG * );
     NTSTATUS (CDECL *key_asymmetric_duplicate)( struct key *, struct key * );
     NTSTATUS (CDECL *key_asymmetric_sign)( struct key *, void *, UCHAR *, ULONG, UCHAR *, ULONG, ULONG *, ULONG );
     NTSTATUS (CDECL *key_asymmetric_verify)( struct key *, void *, UCHAR *, ULONG, UCHAR *, ULONG, DWORD );
diff --git a/dlls/bcrypt/bcrypt_main.c b/dlls/bcrypt/bcrypt_main.c
index 6729edf671f..59835014530 100644
--- a/dlls/bcrypt/bcrypt_main.c
+++ b/dlls/bcrypt/bcrypt_main.c
@@ -1715,21 +1715,12 @@ NTSTATUS WINAPI BCryptEncrypt( BCRYPT_KEY_HANDLE handle, UCHAR *input, ULONG inp
     return key_encrypt( key, input, input_len, padding, iv, iv_len, output, output_len, ret_len, flags );
 }
 
-static NTSTATUS key_asymmetric_decrypt( struct key *key, UCHAR *input, ULONG input_len, UCHAR *output,
-                                        ULONG output_len, ULONG *ret_len )
-{
-    NTSTATUS status;
-    if (!(status = key_funcs->key_asymmetric_decrypt( key, input, input_len, output, &output_len )))
-        *ret_len = output_len;
-    return status;
-}
-
 static NTSTATUS key_decrypt( struct key *key, UCHAR *input, ULONG input_len, void *padding, UCHAR *iv,
                              ULONG iv_len, UCHAR *output, ULONG output_len, ULONG *ret_len, ULONG flags )
 {
     if (key_is_symmetric( key ))
         return key_symmetric_decrypt( key, input, input_len, padding, iv, iv_len, output, output_len, ret_len, flags );
-    return key_asymmetric_decrypt( key, input, input_len, output, output_len, ret_len );
+    return key_funcs->key_asymmetric_decrypt( key, input, input_len, output, output_len, ret_len );
 }
 
 NTSTATUS WINAPI BCryptDecrypt( BCRYPT_KEY_HANDLE handle, UCHAR *input, ULONG input_len, void *padding, UCHAR *iv,
diff --git a/dlls/bcrypt/gnutls.c b/dlls/bcrypt/gnutls.c
index 2f0c62bc6da..9c1e7b5ab06 100644
--- a/dlls/bcrypt/gnutls.c
+++ b/dlls/bcrypt/gnutls.c
@@ -1846,32 +1846,26 @@ static NTSTATUS CDECL key_asymmetric_duplicate( struct key *key_orig, struct key
     return STATUS_SUCCESS;
 }
 
-static NTSTATUS CDECL key_asymmetric_decrypt( struct key *key, UCHAR *input, ULONG input_len,
-        UCHAR *output, ULONG *output_len )
+static NTSTATUS CDECL key_asymmetric_decrypt( struct key *key, UCHAR *input, ULONG input_len, UCHAR *output,
+                                              ULONG output_len, ULONG *ret_len )
 {
     gnutls_datum_t e, d = { 0 };
     NTSTATUS status = STATUS_SUCCESS;
     int ret;
 
-    e.data = (unsigned char *)input;
+    e.data = input;
     e.size = input_len;
-
     if ((ret = pgnutls_privkey_decrypt_data( key_data(key)->privkey, 0, &e, &d )))
     {
         pgnutls_perror( ret );
         return STATUS_INTERNAL_ERROR;
     }
 
-    if (*output_len >= d.size)
-    {
-        *output_len = d.size;
-        memcpy( output, d.data, *output_len );
-    }
-    else
-        status = STATUS_BUFFER_TOO_SMALL;
+    *ret_len = d.size;
+    if (output_len >= d.size) memcpy( output, d.data, *ret_len );
+    else status = STATUS_BUFFER_TOO_SMALL;
 
     free( d.data );
-
     return status;
 }