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OSSL_FN: Wrap BIGNUM the 'mul' function around the OSSL_FN 'mul' function

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Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/29203)
This commit is contained in:
Richard Levitte 2025-11-24 14:39:44 +01:00 • committed by Tomas Mraz
parent 5ea9b46e95
commit 8f77f825fa
1 changed files with 28 additions and 2 deletions
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30
crypto/bn/bn_mul.c
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@ -13,11 +13,37 @@
int BN_mul(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
{
int ret = bn_mul_fixed_top(r, a, b, ctx);
/* TODO(FIXNUM): TO BE REMOVED */
if (r->data == NULL || a->data == NULL || b->data == NULL) {
int ret = bn_mul_fixed_top(r, a, b, ctx);
bn_correct_top(r);
bn_correct_top(r);
bn_check_top(r);
return ret;
}
bn_check_top(a);
bn_check_top(b);
bn_check_top(r);
size_t top = a->top + b->top;
size_t max = a->dmax + b->dmax;
/*
* Unfortunately, OSSL_FN_CTX and BN_CTX are too wildly different to
* be interchangeable. We must therefore create an OSSL_FN_CTX here.
* (OSSL_FN_CTX is only really useful within OSSL_FN functionality)
*/
OSSL_FN_CTX *fnctx = OSSL_FN_CTX_new(NULL, 1, 1, max);
OSSL_FN *rf = bn_acquire_ossl_fn(r, (int)top);
int ret = OSSL_FN_mul(rf, a->data, b->data, fnctx);
bn_release(r, (int)top);
if (ret && !BN_is_zero(r))
r->neg = a->neg ^ b->neg;
OSSL_FN_CTX_free(fnctx);
return ret;
}