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Add functions EC_POINT_mul and EC_GROUP_precompute.

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The latter does nothing for now, but its existence means
that applications can request precomputation when appropriate.
This commit is contained in:
Bodo Möller
2001-03-11 12:27:24 +00:00
parent 86a921af06
commit 3837491174
5 changed files with 135 additions and 39 deletions
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62
crypto/ec/ec_mult.c
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@@ -77,8 +77,8 @@
* scalar*generator
* is included in the addition if scalar != NULL
*/
int EC_POINTs_mul(const EC_GROUP *group, EC_POINT *r, BIGNUM *scalar,
size_t num, EC_POINT *points[], BIGNUM *scalars[], BN_CTX *ctx)
int EC_POINTs_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar,
size_t num, const EC_POINT *points[], const BIGNUM *scalars[], BN_CTX *ctx)
{
BN_CTX *new_ctx = NULL;
EC_POINT *generator = NULL;
@@ -228,7 +228,7 @@ int EC_POINTs_mul(const EC_GROUP *group, EC_POINT *r, BIGNUM *scalar,
{
if (wbits[i] == 0)
{
BIGNUM *s;
const BIGNUM *s;
s = i < num ? scalars[i] : scalar;
@@ -295,3 +295,59 @@ int EC_POINTs_mul(const EC_GROUP *group, EC_POINT *r, BIGNUM *scalar,
}
return ret;
}
int EC_POINT_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *g_scalar, const EC_POINT *point, const BIGNUM *p_scalar, BN_CTX *ctx)
{
const EC_POINT *points[1];
const BIGNUM *scalars[1];
points[0] = point;
scalars[0] = p_scalar;
return EC_POINTs_mul(group, r, g_scalar, (point != NULL && p_scalar != NULL), points, scalars, ctx);
}
int EC_GROUP_precompute(EC_GROUP *group, BN_CTX *ctx)
{
const EC_POINT *generator;
BN_CTX *new_ctx = NULL;
BIGNUM *order;
int ret = 0;
generator = EC_GROUP_get0_generator(group);
if (generator == NULL)
{
ECerr(EC_F_EC_GROUP_PRECOMPUTE, EC_R_UNDEFINED_GENERATOR);
return 0;
}
if (ctx == NULL)
{
ctx = new_ctx = BN_CTX_new();
if (ctx == NULL)
return 0;
}
BN_CTX_start(ctx);
order = BN_CTX_get(ctx);
if (order == NULL) goto err;
if (!EC_GROUP_get_order(group, order, ctx)) return 0;
if (BN_is_zero(order))
{
ECerr(EC_F_EC_GROUP_PRECOMPUTE, EC_R_UNKNOWN_ORDER);
goto err;
}
/* TODO */
ret = 1;
err:
BN_CTX_end(ctx);
if (new_ctx != NULL)
BN_CTX_free(new_ctx);
return ret;
}