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Derive ECDH secret in Nagare

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Florian Märkl 2018-11-26 19:19:31 +01:00
commit 81a6415b6c
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GPG key ID: 125BC8A5A6A1E857
4 changed files with 14 additions and 13 deletions
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4
lib/include/chiaki/ecdh.h
View file

@ -27,6 +27,8 @@
extern "C" {
#endif
#define CHIAKI_ECDH_SECRET_SIZE 32
typedef struct chiaki_ecdh_t
{
struct ec_group_st *group;
@ -36,7 +38,7 @@ typedef struct chiaki_ecdh_t
CHIAKI_EXPORT ChiakiErrorCode chiaki_ecdh_init(ChiakiECDH *ecdh);
CHIAKI_EXPORT void chiaki_ecdh_fini(ChiakiECDH *ecdh);
CHIAKI_EXPORT ChiakiErrorCode chiaki_ecdh_get_local_pub_key(ChiakiECDH *ecdh, uint8_t *key_out, size_t *key_out_size, const uint8_t *handshake_key, uint8_t *sig_out, size_t *sig_out_size);
CHIAKI_EXPORT ChiakiErrorCode chiaki_ecdh_derive_secret(ChiakiECDH *ecdh, uint8_t *secret_out, size_t *secret_out_size, const uint8_t *remote_key, size_t remote_key_size, const uint8_t *handshake_key, const uint8_t *remote_sig, size_t remote_sig_size);
CHIAKI_EXPORT ChiakiErrorCode chiaki_ecdh_derive_secret(ChiakiECDH *ecdh, uint8_t *secret_out, const uint8_t *remote_key, size_t remote_key_size, const uint8_t *handshake_key, const uint8_t *remote_sig, size_t remote_sig_size);
CHIAKI_EXPORT ChiakiErrorCode chiaki_ecdh_set_local_key(ChiakiECDH *ecdh, const uint8_t *private_key, size_t private_key_size, const uint8_t *public_key, size_t public_key_size);
#ifdef __cplusplus

8
lib/src/ecdh.c
View file

@ -108,7 +108,7 @@ CHIAKI_EXPORT ChiakiErrorCode chiaki_ecdh_get_local_pub_key(ChiakiECDH *ecdh, ui
return CHIAKI_ERR_SUCCESS;
}
CHIAKI_EXPORT ChiakiErrorCode chiaki_ecdh_derive_secret(ChiakiECDH *ecdh, uint8_t *secret_out, size_t *secret_out_size, const uint8_t *remote_key, size_t remote_key_size, const uint8_t *handshake_key, const uint8_t *remote_sig, size_t remote_sig_size)
CHIAKI_EXPORT ChiakiErrorCode chiaki_ecdh_derive_secret(ChiakiECDH *ecdh, uint8_t *secret_out, const uint8_t *remote_key, size_t remote_key_size, const uint8_t *handshake_key, const uint8_t *remote_sig, size_t remote_sig_size)
{
EC_POINT *remote_public_key = EC_POINT_new(ecdh->group);
if(!remote_public_key)
@ -120,14 +120,12 @@ CHIAKI_EXPORT ChiakiErrorCode chiaki_ecdh_derive_secret(ChiakiECDH *ecdh, uint8_
return CHIAKI_ERR_UNKNOWN;
}
int r = ECDH_compute_key(secret_out, *secret_out_size, remote_public_key, ecdh->key_local, NULL);
int r = ECDH_compute_key(secret_out, CHIAKI_ECDH_SECRET_SIZE, remote_public_key, ecdh->key_local, NULL);
EC_POINT_free(remote_public_key);
if(r <= 0)
if(r != CHIAKI_ECDH_SECRET_SIZE)
return CHIAKI_ERR_UNKNOWN;
*secret_out_size = (size_t)r;
return CHIAKI_ERR_SUCCESS;
}

10
lib/src/nagare.c
View file

@ -200,10 +200,12 @@ static void nagare_takion_data_expect_bang(ChiakiNagare *nagare, uint8_t *buf, s
CHIAKI_LOGI(nagare->log, "Nagare bang looks good so far\n");
// chiaki_ecdh_derive_secret(&nagare->session->ecdh,
// ecdh_pub_key_buf.buf, ecdh_pub_key_buf.size,
// nagare->session->handshake_key,
// ecdh_sig_buf.buf, ecdh_sig_buf.size);
uint8_t secret[CHIAKI_ECDH_SECRET_SIZE];
chiaki_ecdh_derive_secret(&nagare->session->ecdh,
secret,
ecdh_pub_key_buf.buf, ecdh_pub_key_buf.size,
nagare->session->handshake_key,
ecdh_sig_buf.buf, ecdh_sig_buf.size);
error:
chiaki_mirai_signal(&nagare->bang_mirai, true);

5
test/gkcrypt.c
View file

@ -53,13 +53,12 @@ static MunitResult test_ecdh(const MunitParameter params[], void *user)
munit_assert_memory_equal(sizeof(local_public_key_sig), local_public_key_sig_result, local_public_key_sig);
uint8_t secret_result[128];
size_t secret_result_size = sizeof(secret_result);
chiaki_ecdh_derive_secret(&ecdh, secret_result, &secret_result_size,
chiaki_ecdh_derive_secret(&ecdh, secret_result,
remote_public_key, sizeof(remote_public_key),
handshake_key,
remote_public_key_sig, sizeof(remote_public_key_sig));
munit_assert_size(secret_result_size, ==, sizeof(secret));
munit_assert_size(CHIAKI_ECDH_SECRET_SIZE, ==, sizeof(secret));
munit_assert_memory_equal(sizeof(secret), secret_result, secret);
chiaki_ecdh_fini(&ecdh);