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Diffstat (limited to 'src/math/twists.c')
| -rw-r--r-- | src/math/twists.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/src/math/twists.c b/src/math/twists.c new file mode 100644 index 0000000..78481f4 --- /dev/null +++ b/src/math/twists.c @@ -0,0 +1,18 @@ +/* + * ecgen, tool for generating Elliptic curve domain parameters + * Copyright (C) 2017-2018 J08nY + */ +#include "twists.h" + +void curve_twist_rand(curve_t *to, const curve_t *of) { + to->field = gcopy(of->field); + GEN v = elltwist(of->curve, NULL); + to->curve = ellinit(v, to->field, -1); + if (typ(of->field) == t_INT) { + to->a = ell_get_a4(to->curve); + to->b = ell_get_a6(to->curve); + } else if (typ(of->field) == t_FFELT) { + to->a = ell_get_a2(to->curve); + to->b = ell_get_a6(to->curve); + } +}
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