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Merge pull request #90 from romanz/master

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crypto: add ECDH session key generation
This commit is contained in:
Pavol Rusnak 2016-06-11 20:35:55 +02:00 committed by GitHub
commit 25598229a8
2 changed files with 23 additions and 0 deletions
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20
firmware/crypto.c
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@ -27,6 +27,7 @@
#include "layout.h"
#include "curves.h"
#include "secp256k1.h"
#include "macros.h"
uint32_t ser_length(uint32_t len, uint8_t *out)
{
@ -100,6 +101,25 @@ int gpgMessageSign(const HDNode *node, const uint8_t *message, size_t message_le
return hdnode_sign_digest(node, message, signature + 1, NULL);
}
int cryptoGetECDHSessionKey(const HDNode *node, const uint8_t *peer_public_key, uint8_t *session_key)
{
curve_point point;
const ecdsa_curve *curve = node->curve->params;
if (!ecdsa_read_pubkey(curve, peer_public_key, &point)) {
return 1;
}
bignum256 k;
bn_read_be(node->private_key, &k);
point_multiply(curve, &k, &point, &point);
MEMSET_BZERO(&k, sizeof(k));
session_key[0] = 0x04;
bn_write_be(&point.x, session_key + 1);
bn_write_be(&point.y, session_key + 33);
MEMSET_BZERO(&point, sizeof(point));
return 0;
}
int cryptoMessageSign(const CoinType *coin, const HDNode *node, const uint8_t *message, size_t message_len, uint8_t *signature)
{
SHA256_CTX ctx;

3
firmware/crypto.h
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@ -37,6 +37,9 @@ int sshMessageSign(const HDNode *node, const uint8_t *message, size_t message_le
int gpgMessageSign(const HDNode *node, const uint8_t *message, size_t message_len, uint8_t *signature);
int cryptoGetECDHSessionKey(const HDNode *node, const uint8_t *peer_public_key, uint8_t *session_key);
int cryptoMessageSign(const CoinType *coin, const HDNode *node, const uint8_t *message, size_t message_len, uint8_t *signature);
int cryptoMessageVerify(const CoinType *coin, const uint8_t *message, size_t message_len, const uint8_t *address_raw, const uint8_t *signature);