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5d8b3a3ef2
Closes #12129 As described in https://github.com/openssl/openssl/issues/12129 the readability of the internal functions providing the two alternative implementations for `BN_mod_inverse()` is a bit lacking. Both these functions are now completely internal, so we have the flexibility needed to slightly improve readability and remove unnecessary NULL checks. The main changes here are: - rename `BN_mod_inverse_no_branch()` as `bn_mod_inverse_no_branch()`: this function is `static` so it is not even visible within the rest of libcrypto. By convention upcase prefixes are reserved for public functions. - remove `if (pnoinv == NULL)` checks in `int_bn_mod_inverse()`: this function is internal to the BN module and we can guarantee that all callers pass non-NULL arguments. - `bn_mod_inverse_no_branch()` takes an extra `int *pnoinv` argument, so that it can signal if no inverse exists for the given inputs: in this way the caller is in charge of raising `BN_R_NO_INVERSE` as it is the case for the non-consttime implementation of `int_bn_mod_inverse()`. - `BN_mod_inverse()` is a public function and must guarantee that the internal functions providing the actual implementation receive valid arguments. If the caller passes a NULL `BN_CTX` we create a temporary one for internal use. - reorder function definitions in `crypto/bn/bn_gcd.c` to avoid forward declaration of `static` functions (in preparation for inlining). - inline `bn_mod_inverse_no_branch()`. Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org> (Merged from https://github.com/openssl/openssl/pull/12142) |
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| .. | ||
| build.info | ||
| err_all.c | ||
| err_blocks.c | ||
| err_local.h | ||
| err_prn.c | ||
| err.c | ||
| openssl.ec | ||
| openssl.txt | ||
| README | ||
Adding new libraries
--------------------
When adding a new sub-library to OpenSSL, assign it a library number
ERR_LIB_XXX, define a macro XXXerr() (both in err.h), add its
name to ERR_str_libraries[] (in crypto/err/err.c), and add
ERR_load_XXX_strings() to the ERR_load_crypto_strings() function
(in crypto/err/err_all.c). Finally, add an entry:
L XXX xxx.h xxx_err.c
to crypto/err/openssl.ec, and add xxx_err.c to the Makefile.
Running make errors will then generate a file xxx_err.c, and
add all error codes used in the library to xxx.h.
Additionally the library include file must have a certain form.
Typically it will initially look like this:
#ifndef HEADER_XXX_H
#define HEADER_XXX_H
#ifdef __cplusplus
extern "C" {
#endif
/* Include files */
#include <openssl/bio.h>
#include <openssl/x509.h>
/* Macros, structures and function prototypes */
/* BEGIN ERROR CODES */
The BEGIN ERROR CODES sequence is used by the error code
generation script as the point to place new error codes, any text
after this point will be overwritten when make errors is run.
The closing #endif etc will be automatically added by the script.
The generated C error code file xxx_err.c will load the header
files stdio.h, openssl/err.h and openssl/xxx.h so the
header file must load any additional header files containing any
definitions it uses.