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group: add ge_to_bytes and ge_from_bytes

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Jonas Nick
2024-01-06 15:53:30 +00:00
parent 1988855079
commit 85e224dd97
4 changed files with 50 additions and 14 deletions
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22
src/group_impl.h
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@@ -7,6 +7,8 @@
#ifndef SECP256K1_GROUP_IMPL_H
#define SECP256K1_GROUP_IMPL_H
#include <string.h>
#include "field.h"
#include "group.h"
#include "util.h"
@@ -941,4 +943,24 @@ static int secp256k1_ge_x_frac_on_curve_var(const secp256k1_fe *xn, const secp25
return secp256k1_fe_is_square_var(&r);
}
static void secp256k1_ge_to_bytes(unsigned char *buf, const secp256k1_ge *a) {
secp256k1_ge_storage s;
/* We require that the secp256k1_ge_storage type is exactly 64 bytes.
* This is formally not guaranteed by the C standard, but should hold on any
* sane compiler in the real world. */
STATIC_ASSERT(sizeof(secp256k1_ge_storage) == 64);
VERIFY_CHECK(!secp256k1_ge_is_infinity(a));
secp256k1_ge_to_storage(&s, a);
memcpy(buf, &s, 64);
}
static void secp256k1_ge_from_bytes(secp256k1_ge *r, const unsigned char *buf) {
secp256k1_ge_storage s;
STATIC_ASSERT(sizeof(secp256k1_ge_storage) == 64);
memcpy(&s, buf, 64);
secp256k1_ge_from_storage(r, &s);
}
#endif /* SECP256K1_GROUP_IMPL_H */