Start Python codegen impl.

1 files changed, 56 insertions, 2 deletions

diff --git a/pyecsca/codegen/bn.c b/pyecsca/codegen/bn.c
index dfd433a..26149ba 100644
--- a/pyecsca/codegen/bn.c
+++ b/pyecsca/codegen/bn.c
@@ -1,9 +1,63 @@
 #include "bn.h"
 
 bn_err bn_init(bn_t *bn) {
-    return mp_init(bn);
+	return mp_init(bn);
+}
+
+void bn_copy(bn_t *from, bn_t *to) {
+	mp_copy(from, to);
 }
 
 void bn_clear(bn_t *bn) {
-    mp_clear(bn);
+	mp_clear(bn);
+}
+
+int bn_from_hex(const char *data, bn_t *out) {
+	return mp_read_radix(out, data, 16);
+}
+
+int bn_from_int(uint64_t value, bn_t *out) {
+	mp_set_u64(out, value);
+	return MP_OKAY;
+}
+
+void bn_mod_add(bn_t *one, bn_t *other, bn_t *mod, bn_t *out) {
+	mp_addmod(one, other, mod, out);
+}
+
+void bn_mod_sub(bn_t *one, bn_t *other, bn_t *mod, bn_t *out) {
+	mp_submod(one, other, mod, out);
+}
+
+void bn_mod_mul(bn_t *one, bn_t *other, bn_t *mod, bn_t *out) {
+	mp_mulmod(one, other, mod, out);
+}
+
+void bn_mod_sqr(bn_t *one, bn_t *mod, bn_t *out) {
+	mp_sqrmod(one, mod, out);
+}
+
+void bn_mod_div(bn_t *one, bn_t *other, bn_t *mod, bn_t *out) {
+	bn_t inv;
+	mp_init(&inv);
+	mp_invmod(other, mod, &inv);
+	mp_mulmod(one, &inv, mod, out);
+	mp_clear(&inv);
+}
+
+void bn_mod_inv(bn_t *one, bn_t *mod, bn_t *out) {
+	mp_invmod(one, mod, out);
+}
+
+int bn_get_bit(bn_t *bn, int which) {
+	int which_digit = which / (sizeof(mp_digit) * 8);
+	int which_bit = which % (sizeof(mp_digit) * 8);
+	if (bn->used <= which_digit) {
+		return 0;
+	}
+	return (bn->dp[which_digit] >> which_bit) & 1;
+}
+
+int bn_bit_length(bn_t *bn) {
+	return mp_count_bits(bn);
 }
\ No newline at end of file