void fp12_inv(fp12_t c, fp12_t a) {
fp6_t t0;
fp6_t t1;
fp6_null(t0);
fp6_null(t1);
TRY {
fp6_new(t0);
fp6_new(t1);
fp6_sqr(t0, a[0]);
fp6_sqr(t1, a[1]);
fp6_mul_art(t1, t1);
fp6_sub(t0, t0, t1);
fp6_inv(t0, t0);
fp6_mul(c[0], a[0], t0);
fp6_neg(c[1], a[1]);
fp6_mul(c[1], c[1], t0);
} CATCH_ANY {
THROW(ERR_CAUGHT);
} FINALLY {
fp6_free(t0);
fp6_free(t1);
}
}
void fp12_sqr_basic(fp12_t c, fp12_t a) {
fp6_t t0, t1;
fp6_null(t0);
fp6_null(t1);
TRY {
fp6_new(t0);
fp6_new(t1);
fp6_add(t0, a[0], a[1]);
fp6_mul_art(t1, a[1]);
fp6_add(t1, a[0], t1);
fp6_mul(t0, t0, t1);
fp6_mul(c[1], a[0], a[1]);
fp6_sub(c[0], t0, c[1]);
fp6_mul_art(t1, c[1]);
fp6_sub(c[0], c[0], t1);
fp6_dbl(c[1], c[1]);
} CATCH_ANY {
THROW(ERR_CAUGHT);
} FINALLY {
fp6_free(t0);
fp6_free(t1);
}
}
void fp18_inv(fp18_t c, fp18_t a) {
fp6_t v0;
fp6_t v1;
fp6_t v2;
fp6_t t0;
fp6_null(v0);
fp6_null(v1);
fp6_null(v2);
fp6_null(t0);
TRY {
fp6_new(v0);
fp6_new(v1);
fp6_new(v2);
fp6_new(t0);
/* v0 = a_0^2 - E * a_1 * a_2. */
fp6_sqr(t0, a[0]);
fp6_mul(v0, a[1], a[2]);
fp6_mul_art(v2, v0);
fp6_sub(v0, t0, v2);
/* v1 = E * a_2^2 - a_0 * a_1. */
fp6_sqr(t0, a[2]);
fp6_mul_art(v2, t0);
fp6_mul(v1, a[0], a[1]);
fp6_sub(v1, v2, v1);
/* v2 = a_1^2 - a_0 * a_2. */
fp6_sqr(t0, a[1]);
fp6_mul(v2, a[0], a[2]);
fp6_sub(v2, t0, v2);
fp6_mul(t0, a[1], v2);
fp6_mul_art(c[1], t0);
fp6_mul(c[0], a[0], v0);
fp6_mul(t0, a[2], v1);
fp6_mul_art(c[2], t0);
fp6_add(t0, c[0], c[1]);
fp6_add(t0, t0, c[2]);
fp6_inv(t0, t0);
fp6_mul(c[0], v0, t0);
fp6_mul(c[1], v1, t0);
fp6_mul(c[2], v2, t0);
} CATCH_ANY {
THROW(ERR_CAUGHT);
} FINALLY {
fp6_free(v0);
fp6_free(v1);
fp6_free(v2);
fp6_free(t0);
}
}
void fp12_mul_basic(fp12_t c, fp12_t a, fp12_t b) {
fp6_t t0, t1, t2;
fp6_null(t0);
fp6_null(t1);
fp6_null(t2);
TRY {
fp6_new(t0);
fp6_new(t1);
fp6_new(t2);
/* Karatsuba algorithm. */
/* t0 = a_0 * b_0. */
fp6_mul(t0, a[0], b[0]);
/* t1 = a_1 * b_1. */
fp6_mul(t1, a[1], b[1]);
/* t2 = b_0 + b_1. */
fp6_add(t2, b[0], b[1]);
/* c_1 = a_0 + a_1. */
fp6_add(c[1], a[0], a[1]);
/* c_1 = (a_0 + a_1) * (b_0 + b_1) */
fp6_mul(c[1], c[1], t2);
fp6_sub(c[1], c[1], t0);
fp6_sub(c[1], c[1], t1);
/* c_0 = a_0b_0 + v * a_1b_1. */
fp6_mul_art(t1, t1);
fp6_add(c[0], t0, t1);
} CATCH_ANY {
THROW(ERR_CAUGHT);
} FINALLY {
fp6_free(t0);
fp6_free(t1);
fp6_free(t2);
}
}
