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/// @file
#include "jets/q.h"
#include "jets/w.h"
#include "noun.h"
#include "urcrypt.h"
#include "ent/ent.h"
static urcrypt_secp_context* sec_u;
/* call at process start */
void
u3je_secp_init()
{
c3_y ent_y[32];
ent_getentropy(ent_y, 32);
sec_u = malloc(urcrypt_secp_prealloc_size());
if ( 0 != urcrypt_secp_init(sec_u, ent_y) ) {
u3l_log("u3e_secp_init failed");
abort();
}
}
/* call at process end */
void
u3je_secp_stop()
{
urcrypt_secp_destroy(sec_u);
free(sec_u);
sec_u = NULL;
}
/* util funcs
*/
static c3_t
_cqes_in_order(u3_atom a)
{
// this is the "n" parameter of the secp256k1 curve
static const c3_w now_w[8] = {
0xd0364141, 0xbfd25e8c, 0xaf48a03b, 0xbaaedce6,
0xfffffffe, 0xffffffff, 0xffffffff, 0xffffffff
};
if ( 0 == a ) {
return 0;
}
else if ( c3y == u3a_is_cat(a) ) {
return 1;
}
else {
u3a_atom* a_u = u3a_to_ptr(a);
c3_w len_w = a_u->len_w;
if ( len_w < 8 ) {
return 1;
}
else if ( len_w > 8 ) {
return 0;
}
else {
c3_y i_y;
c3_w *buf_w = a_u->buf_w;
// loop from most to least significant words
for ( i_y = 8; i_y > 0; ) {
c3_w b_w = buf_w[i_y],
o_w = now_w[--i_y];
if ( b_w < o_w ) {
return 1;
}
else if ( b_w > o_w ) {
return 0;
}
}
return 1;
}
}
}
static void
_cqes_unpack_fe(u3_atom k, c3_y out_y[32])
{
if ( _cqes_in_order(k) ) {
u3r_bytes(0, 32, out_y, k);
}
else {
u3m_bail(c3__exit);
}
}
/* sign hash with priv key
*/
static u3_noun
_cqes_sign(u3_atom has,
u3_atom prv)
{
c3_y has_y[32];
if ( 0 != u3r_bytes_fit(32, has_y, has) ) {
return u3m_bail(c3__exit);
}
else {
c3_y prv_y[32], v_y, r_y[32], s_y[32];
_cqes_unpack_fe(prv, prv_y);
return( 0 == urcrypt_secp_sign(sec_u, has_y, prv_y, &v_y, r_y, s_y) )
? u3nt(v_y, u3i_bytes(32, r_y), u3i_bytes(32, s_y))
: u3_none;
}
}
u3_noun
u3we_sign(u3_noun cor)
{
u3_noun has, prv;
if ( (c3n == u3r_mean(cor,
u3x_sam_2, &has,
u3x_sam_3, &prv,
0)) ||
(c3n == u3ud(has)) ||
(c3n == u3ud(prv))) {
return u3m_bail(c3__exit);
}
else {
return u3l_punt("secp-sign", _cqes_sign(has, prv));
}
}
/* recover pubkey from signature (which is how we verify signatures)
*/
static u3_noun
_cqes_reco(u3_atom has,
u3_atom siv, /* signature: v */
u3_atom sir, /* signature: r */
u3_atom sis) /* signature: s */
{
c3_y has_y[32];
if ( !((siv < 4) && (0 == u3r_bytes_fit(32, has_y, has)) ) ) {
return u3m_bail(c3__exit);
}
else {
c3_y sir_y[32], sis_y[32], x_y[32], y_y[32];
_cqes_unpack_fe(sir, sir_y);
_cqes_unpack_fe(sis, sis_y);
return
( 0 == urcrypt_secp_reco(sec_u, has_y, siv, sir_y, sis_y, x_y, y_y) )
? u3nc(u3i_bytes(32, x_y), u3i_bytes(32, y_y))
: u3_none;
}
}
u3_noun
u3we_reco(u3_noun cor)
{
u3_noun has, /* hash */
siv, sir, sis; /* signature: v, r, s */
if ( (c3n == u3r_mean(cor,
u3x_sam_2, &has,
u3x_sam_6, &siv,
u3x_sam_14, &sir,
u3x_sam_15, &sis,
0)) ||
(c3n == u3ud(has)) ||
(c3n == u3ud(siv)) ||
(c3n == u3ud(sir)) ||
(c3n == u3ud(sis)) ) {
return u3m_bail(c3__exit);
}
else {
return u3l_punt("secp-reco", _cqes_reco(has, siv, sir, sis));
}
}
static u3_atom
_cqes_make(u3_atom has,
u3_atom prv)
{
c3_y has_y[32];
if ( 0 != u3r_bytes_fit(32, has_y, has) ) {
return u3m_bail(c3__exit);
}
else {
c3_y prv_y[32], out_y[32];
_cqes_unpack_fe(prv, prv_y);
return ( 0 == urcrypt_secp_make(has_y, prv_y, out_y) )
? u3i_bytes(32, out_y)
: u3_none;
}
}
u3_noun
u3we_make(u3_noun cor)
{
u3_noun has, prv;
if ( (c3n == u3r_mean(cor,
u3x_sam_2, &has,
u3x_sam_3, &prv,
0)) ||
(c3n == u3ud(has)) ||
(c3n == u3ud(prv)) ) {
return u3m_bail(c3__exit);
}
else {
return u3l_punt("secp-make", _cqes_make(has, prv));
}
}
/* create a schnorr signature
*/
static u3_weak
_cqes_sosi(u3_atom sk, u3_atom m, u3_atom a)
{
c3_y key_y[32];
c3_y mes_y[32];
c3_y aux_y[32];
if ( (0 != u3r_bytes_fit(32, key_y, sk)) ||
(0 != u3r_bytes_fit(32, mes_y, m)) ||
(0 != u3r_bytes_fit(32, aux_y, a)) )
{
return u3m_bail(c3__exit);
}
else {
c3_y sig_y[64];
return
( 0 == urcrypt_secp_schnorr_sign(sec_u, key_y, mes_y, aux_y, sig_y) )
? u3i_bytes(64, sig_y)
: u3_none;
}
}
u3_noun
u3we_sosi(u3_noun cor)
{
u3_noun key, mes, aux;
if ( (c3n == u3r_mean(cor,
u3x_sam_2, &key,
u3x_sam_6, &mes,
u3x_sam_7, &aux,
0)) ||
(c3n == u3ud(key)) ||
(c3n == u3ud(mes)) ||
(c3n == u3ud(aux)) )
{
return u3m_bail(c3__exit);
}
else {
return u3l_punt("secp-sosi", _cqes_sosi(key, mes, aux));
}
}
/* verify a schnorr signature
*/
static u3_atom
_cqes_sove(u3_atom pk, u3_atom m, u3_atom sig)
{
c3_y pub_y[32];
c3_y mes_y[32];
c3_y sig_y[64];
if ( (0 != u3r_bytes_fit(32, pub_y, pk)) ||
(0 != u3r_bytes_fit(32, mes_y, m)) ||
(0 != u3r_bytes_fit(64, sig_y, sig)) )
{
return u3m_bail(c3__exit);
}
else {
return __(urcrypt_secp_schnorr_veri(sec_u, sig_y, mes_y, pub_y));
}
}
u3_noun
u3we_sove(u3_noun cor)
{
u3_noun pub, mes, sig;
if ( (c3n == u3r_mean(cor,
u3x_sam_2, &pub,
u3x_sam_6, &mes,
u3x_sam_7, &sig,
0)) ||
(c3n == u3ud(pub)) ||
(c3n == u3ud(mes)) ||
(c3n == u3ud(sig)) )
{
return u3m_bail(c3__exit);
}
else {
return _cqes_sove(pub, mes, sig);
}
}
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