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Expose two, rather internal, BIGNUM functions.

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Android uses these for some conversions from Java formats. The code is
sufficiently bespoke that putting the conversion functions into
BoringSSL doesn't make a lot of sense, but the alternative is to expose
these ones.

Change-Id: If1362bc4a5c44cba4023c909e2ba6488ae019ddb
This commit is contained in:
Adam Langley 2014-08-13 10:31:52 -07:00
parent 660140206e
commit b8b5478248
2 changed files with 16 additions and 9 deletions
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9
crypto/bn/internal.h
View File

@ -131,19 +131,10 @@
extern "C" {
#endif
/* BN_wexpand ensures that |bn| has at least |words| works of space without
* altering its value. It returns one on success or zero on allocation
* failure. */
BIGNUM *bn_wexpand(BIGNUM *bn, unsigned words);
/* bn_expand acts the same as |BN_wexpand|, but takes a number of bits rather
* than a number of words. */
BIGNUM *bn_expand(BIGNUM *bn, unsigned bits);
/* bn_correct_top decrements |bn->top| until |bn->d[top-1]| is non-zero or
* until |top| is zero. */
void bn_correct_top(BIGNUM *bn);
#if defined(OPENSSL_64_BIT)
#define BN_ULLONG unsigned long long

16
include/openssl/bn.h
View File

@ -284,6 +284,22 @@ OPENSSL_EXPORT int BN_print_fp(FILE *fp, const BIGNUM *a);
OPENSSL_EXPORT BN_ULONG BN_get_word(const BIGNUM *bn);
/* Internal functions.
*
* These functions are useful for code that is doing low-level manipulations of
* BIGNUM values. However, be sure that no other function in this file does
* what you want before turning to these. */
/* bn_correct_top decrements |bn->top| until |bn->d[top-1]| is non-zero or
* until |top| is zero. */
OPENSSL_EXPORT void bn_correct_top(BIGNUM *bn);
/* bn_wexpand ensures that |bn| has at least |words| works of space without
* altering its value. It returns one on success or zero on allocation
* failure. */
OPENSSL_EXPORT BIGNUM *bn_wexpand(BIGNUM *bn, unsigned words);
/* BIGNUM pools.
*
* Certain BIGNUM operations need to use many temporary variables and