Add a BN_R_INVALID_ARGUMENT error code

One problem with OpenSSL error codes is that they tend to be too specific
(another problem is that they are extremely ugly). So add an EINVAL-style
error code. This will be used in an upcoming commit to disallow aliasing
of the 'return value' with the modulus in BN_mod_* functions and should
be applicable elsewhere, outside of this one narrow use case.

ok jsing

2 files changed, 4 insertions, 2 deletions

diff --git a/src/lib/libcrypto/bn/bn.h b/src/lib/libcrypto/bn/bn.h
index 386f8dff8d..7dc138d170 100644
--- a/src/lib/libcrypto/bn/bn.h
+++ b/src/lib/libcrypto/bn/bn.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: bn.h,v 1.71 2023/04/27 06:48:47 tb Exp $ */
+/* $OpenBSD: bn.h,v 1.72 2023/06/13 09:12:22 tb Exp $ */
 /* Copyright (C) 1995-1997 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -547,6 +547,7 @@ void ERR_load_BN_strings(void);
 #define BN_R_ENCODING_ERROR                              104
 #define BN_R_EXPAND_ON_STATIC_BIGNUM_DATA                105
 #define BN_R_INPUT_NOT_REDUCED                           110
+#define BN_R_INVALID_ARGUMENT                            118
 #define BN_R_INVALID_LENGTH                              106
 #define BN_R_INVALID_RANGE                               115
 #define BN_R_NOT_A_SQUARE                                111
diff --git a/src/lib/libcrypto/bn/bn_err.c b/src/lib/libcrypto/bn/bn_err.c
index 592c509416..b861ea9374 100644
--- a/src/lib/libcrypto/bn/bn_err.c
+++ b/src/lib/libcrypto/bn/bn_err.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: bn_err.c,v 1.15 2022/07/12 14:42:48 kn Exp $ */
+/* $OpenBSD: bn_err.c,v 1.16 2023/06/13 09:12:22 tb Exp $ */
 /* ====================================================================
  * Copyright (c) 1999-2007 The OpenSSL Project.  All rights reserved.
  *
@@ -80,6 +80,7 @@ static ERR_STRING_DATA BN_str_reasons[]= {
         {ERR_REASON(BN_R_ENCODING_ERROR)         , "encoding error"},
         {ERR_REASON(BN_R_EXPAND_ON_STATIC_BIGNUM_DATA), "expand on static bignum data"},
         {ERR_REASON(BN_R_INPUT_NOT_REDUCED)      , "input not reduced"},
+        {ERR_REASON(BN_R_INVALID_ARGUMENT)       , "invalid argument"},
         {ERR_REASON(BN_R_INVALID_LENGTH)         , "invalid length"},
         {ERR_REASON(BN_R_INVALID_RANGE)          , "invalid range"},
         {ERR_REASON(BN_R_NOT_A_SQUARE)           , "not a square"},