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Add BN_native2bn and BN_bn2nativepad, for native BIGNUM import/export

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These are a couple of utility functions, to make import and export of
BIGNUMs to byte strings in platform native for (little-endian or
big-endian) easier.

Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/8346)
This commit is contained in:
Richard Levitte 2019-02-26 13:08:31 +01:00
parent 1a31d8017e
commit fa4d419c25
4 changed files with 33 additions and 3 deletions
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18
crypto/bn/bn_lib.c
View file

@ -536,6 +536,24 @@ int BN_bn2lebinpad(const BIGNUM *a, unsigned char *to, int tolen)
return tolen;
}
BIGNUM *BN_native2bn(const unsigned char *s, int len, BIGNUM *ret)
{
#ifdef B_ENDIAN
return BN_bin2bn(s, len, ret);
#else
return BN_lebin2bn(s, len, ret);
#endif
}
int BN_bn2nativepad(const BIGNUM *a, unsigned char *to, int tolen)
{
#ifdef B_ENDIAN
return BN_bn2binpad(a, to, tolen);
#else
return BN_bn2lebinpad(a, to, tolen);
#endif
}
int BN_ucmp(const BIGNUM *a, const BIGNUM *b)
{
int i;

14
doc/man3/BN_bn2bin.pod
View file

@ -3,9 +3,9 @@
=head1 NAME
BN_bn2binpad,
BN_bn2bin, BN_bin2bn, BN_bn2lebinpad, BN_lebin2bn, BN_bn2hex, BN_bn2dec,
BN_hex2bn, BN_dec2bn, BN_print, BN_print_fp, BN_bn2mpi,
BN_mpi2bn - format conversions
BN_bn2bin, BN_bin2bn, BN_bn2lebinpad, BN_lebin2bn,
BN_bn2nativepad, BN_native2bn, BN_bn2hex, BN_bn2dec, BN_hex2bn, BN_dec2bn,
BN_print, BN_print_fp, BN_bn2mpi, BN_mpi2bn - format conversions
=head1 SYNOPSIS
@ -18,6 +18,9 @@ BN_mpi2bn - format conversions
int BN_bn2lebinpad(const BIGNUM *a, unsigned char *to, int tolen);
BIGNUM *BN_lebin2bn(const unsigned char *s, int len, BIGNUM *ret);
int BN_bn2nativepad(const BIGNUM *a, unsigned char *to, int tolen);
BIGNUM *BN_native2bn(const unsigned char *s, int len, BIGNUM *ret);
char *BN_bn2hex(const BIGNUM *a);
char *BN_bn2dec(const BIGNUM *a);
int BN_hex2bn(BIGNUM **a, const char *str);
@ -47,6 +50,11 @@ NULL, a new B<BIGNUM> is created.
BN_bn2lebinpad() and BN_lebin2bn() are identical to BN_bn2binpad() and
BN_bin2bn() except the buffer is in little-endian format.
BN_bn2nativepad() and BN_native2bn() are identical to BN_bn2binpad() and
BN_bin2bn() except the buffer is in native format, i.e. most significant
byte first on big-endian platforms, and least significant byte first on
little-endian platforms.
BN_bn2hex() and BN_bn2dec() return printable strings containing the
hexadecimal and decimal encoding of B<a> respectively. For negative
numbers, the string is prefaced with a leading '-'. The string must be

2
include/openssl/bn.h
View file

@ -223,6 +223,8 @@ int BN_bn2bin(const BIGNUM *a, unsigned char *to);
int BN_bn2binpad(const BIGNUM *a, unsigned char *to, int tolen);
BIGNUM *BN_lebin2bn(const unsigned char *s, int len, BIGNUM *ret);
int BN_bn2lebinpad(const BIGNUM *a, unsigned char *to, int tolen);
BIGNUM *BN_native2bn(const unsigned char *s, int len, BIGNUM *ret);
int BN_bn2nativepad(const BIGNUM *a, unsigned char *to, int tolen);
BIGNUM *BN_mpi2bn(const unsigned char *s, int len, BIGNUM *ret);
int BN_bn2mpi(const BIGNUM *a, unsigned char *to);
int BN_sub(BIGNUM *r, const BIGNUM *a, const BIGNUM *b);

2
util/libcrypto.num
View file

@ -4644,3 +4644,5 @@ CRYPTO_alloc_ex_data 4599 3_0_0 EXIST::FUNCTION:
OPENSSL_CTX_new 4600 3_0_0 EXIST::FUNCTION:
OPENSSL_CTX_free 4601 3_0_0 EXIST::FUNCTION:
OPENSSL_LH_flush 4602 3_0_0 EXIST::FUNCTION:
BN_native2bn 4603 3_0_0 EXIST::FUNCTION:
BN_bn2nativepad 4604 3_0_0 EXIST::FUNCTION: