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add call-ec_p256k1

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This commit is contained in:
NIIBE Yutaka
2014-02-20 10:55:20 +09:00
parent deaf340687
commit a32f577dfa
6 changed files with 138 additions and 69 deletions
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68
src/call-ec_p256r1.c
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@@ -2,7 +2,7 @@
* call-ec_p256r1.c - interface between Gnuk and Elliptic curve over
* GF(p256r1)
*
* Copyright (C) 2013 Free Software Initiative of Japan
* Copyright (C) 2014 Free Software Initiative of Japan
* Author: NIIBE Yutaka <gniibe@fsij.org>
*
* This file is a part of Gnuk, a GnuPG USB Token implementation.
@@ -29,68 +29,6 @@
#include "jpc-ac_p256r1.h"
#include "ec_p256r1.h"
#include "config.h"
#define FIELD p256r1
#include "gnuk.h"
/* We are little endian. */
#define ECDSA_BYTE_SIZE 32
int
ecdsa_sign (const uint8_t *hash, uint8_t *output,
const struct key_data *kd)
{
int i;
bn256 r[1], s[1], z[1], d[1];
uint8_t *p;
p = (uint8_t *)d;
for (i = 0; i < ECDSA_BYTE_SIZE; i++)
p[ECDSA_BYTE_SIZE - i - 1] = kd->data[i];
p = (uint8_t *)z;
for (i = 0; i < ECDSA_BYTE_SIZE; i++)
p[ECDSA_BYTE_SIZE - i - 1] = hash[i];
ecdsa_p256r1 (r, s, z, d);
p = (uint8_t *)r;
for (i = 0; i < ECDSA_BYTE_SIZE; i++)
*output++ = p[ECDSA_BYTE_SIZE - i - 1];
p = (uint8_t *)s;
for (i = 0; i < ECDSA_BYTE_SIZE; i++)
*output++ = p[ECDSA_BYTE_SIZE - i - 1];
return 0;
}
uint8_t *
ecdsa_compute_public (const uint8_t *key_data)
{
uint8_t *p0, *p, *p1;
ac q[1];
bn256 k[1];
int i;
p0 = (uint8_t *)malloc (ECDSA_BYTE_SIZE * 2);
if (p0 == NULL)
return NULL;
p = (uint8_t *)k;
for (i = 0; i < ECDSA_BYTE_SIZE; i++)
p[ECDSA_BYTE_SIZE - i - 1] = key_data[i];
if (compute_kG (q, k) < 0)
{
free (p0);
return NULL;
}
p = p0;
p1 = (uint8_t *)q->x;
for (i = 0; i < ECDSA_BYTE_SIZE; i++)
*p++ = p1[ECDSA_BYTE_SIZE - i - 1];
p1 = (uint8_t *)q->y;
for (i = 0; i < ECDSA_BYTE_SIZE; i++)
*p++ = p1[ECDSA_BYTE_SIZE - i - 1];
return p0;
}
#include "call-ec.c"