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chore(legacy): drop unused ECIES code

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This commit is contained in:
Pavol Rusnak 2021-11-19 10:54:52 +01:00
parent d656f88572
commit 3488138285
2 changed files with 0 additions and 135 deletions
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123
legacy/firmware/crypto.c
View File

@ -254,129 +254,6 @@ int cryptoMessageVerify(const CoinInfo *coin, const uint8_t *message,
return 0; return 0;
} }
/* ECIES disabled
int cryptoMessageEncrypt(curve_point *pubkey, const uint8_t *msg, size_t
msg_size, bool display_only, uint8_t *nonce, size_t *nonce_len, uint8_t
*payload, size_t *payload_len, uint8_t *hmac, size_t *hmac_len, const uint8_t
*privkey, const uint8_t *address_raw)
{
if (privkey && address_raw) { // signing == true
HDNode node = {0};
payload[0] = display_only ? 0x81 : 0x01;
uint32_t l = ser_length(msg_size, payload + 1);
memcpy(payload + 1 + l, msg, msg_size);
memcpy(payload + 1 + l + msg_size, address_raw, 21);
hdnode_from_xprv(0, 0, 0, privkey, privkey, SECP256K1_NAME,
&node); if (cryptoMessageSign(&node, msg, msg_size, payload + 1 + l + msg_size +
21) != 0) { return 1;
}
*payload_len = 1 + l + msg_size + 21 + 65;
} else {
payload[0] = display_only ? 0x80 : 0x00;
uint32_t l = ser_length(msg_size, payload + 1);
memcpy(payload + 1 + l, msg, msg_size);
*payload_len = 1 + l + msg_size;
}
// generate random nonce
curve_point R = {0};
bignum256 k = {0};
if (generate_k_random(&secp256k1, &k) != 0) {
return 2;
}
// compute k*G
scalar_multiply(&secp256k1, &k, &R);
nonce[0] = 0x02 | (R.y.val[0] & 0x01);
bn_write_be(&R.x, nonce + 1);
*nonce_len = 33;
// compute shared secret
point_multiply(&secp256k1, &k, pubkey, &R);
uint8_t shared_secret[33] = {0};
shared_secret[0] = 0x02 | (R.y.val[0] & 0x01);
bn_write_be(&R.x, shared_secret + 1);
// generate keying bytes
uint8_t keying_bytes[80] = {0};
uint8_t salt[22 + 33] = {0};
memcpy(salt, "Bitcoin Secure Message", 22);
memcpy(salt + 22, nonce, 33);
pbkdf2_hmac_sha256(shared_secret, 33, salt, 22 + 33, 2048, keying_bytes,
80);
// encrypt payload
aes_encrypt_ctx ctx = {0};
aes_encrypt_key256(keying_bytes, &ctx);
aes_cfb_encrypt(payload, payload, *payload_len, keying_bytes + 64,
&ctx);
// compute hmac
uint8_t out[32] = {0};
hmac_sha256(keying_bytes + 32, 32, payload, *payload_len, out);
memcpy(hmac, out, 8);
*hmac_len = 8;
return 0;
}
int cryptoMessageDecrypt(curve_point *nonce, uint8_t *payload, size_t
payload_len, const uint8_t *hmac, size_t hmac_len, const uint8_t *privkey,
uint8_t *msg, size_t *msg_len, bool *display_only, bool *signing, uint8_t
*address_raw)
{
if (hmac_len != 8) {
return 1;
}
// compute shared secret
curve_point R = {0};
bignum256 k = {0};
bn_read_be(privkey, &k);
point_multiply(&secp256k1, &k, nonce, &R);
uint8_t shared_secret[33] = {0};
shared_secret[0] = 0x02 | (R.y.val[0] & 0x01);
bn_write_be(&R.x, shared_secret + 1);
// generate keying bytes
uint8_t keying_bytes[80] = {0};
uint8_t salt[22 + 33] = {0};
memcpy(salt, "Bitcoin Secure Message", 22);
salt[22] = 0x02 | (nonce->y.val[0] & 0x01);
bn_write_be(&(nonce->x), salt + 23);
pbkdf2_hmac_sha256(shared_secret, 33, salt, 22 + 33, 2048, keying_bytes,
80);
// compute hmac
uint8_t out[32] = {0};
hmac_sha256(keying_bytes + 32, 32, payload, payload_len, out);
if (memcmp(hmac, out, 8) != 0) {
return 2;
}
// decrypt payload
aes_encrypt_ctx ctx = {0};
aes_encrypt_key256(keying_bytes, &ctx);
aes_cfb_decrypt(payload, payload, payload_len, keying_bytes + 64, &ctx);
// check first byte
if (payload[0] != 0x00 && payload[0] != 0x01 && payload[0] != 0x80 &&
payload[0] != 0x81) { return 3;
}
*signing = payload[0] & 0x01;
*display_only = payload[0] & 0x80;
uint32_t l = 0; uint32_t o = 0;
l = deser_length(payload + 1, &o);
if (*signing) {
// FIXME: assumes a raw address is 21 bytes (also below).
if (1 + l + o + 21 + 65 != payload_len) {
return 4;
}
// FIXME: cryptoMessageVerify changed to take the address_type
as a parameter. if (cryptoMessageVerify(payload + 1 + l, o, payload + 1 + l + o,
payload + 1 + l + o + 21) != 0) { return 5;
}
memcpy(address_raw, payload + 1 + l + o, 21);
} else {
if (1 + l + o != payload_len) {
return 4;
}
}
memcpy(msg, payload + 1 + l, o);
*msg_len = o;
return 0;
}
*/
const HDNode *cryptoMultisigPubkey(const CoinInfo *coin, const HDNode *cryptoMultisigPubkey(const CoinInfo *coin,
const MultisigRedeemScriptType *multisig, const MultisigRedeemScriptType *multisig,
uint32_t index) { uint32_t index) {

12
legacy/firmware/crypto.h
View File

@ -62,18 +62,6 @@ int cryptoMessageVerify(const CoinInfo *coin, const uint8_t *message,
size_t message_len, const char *address, size_t message_len, const char *address,
const uint8_t *signature); const uint8_t *signature);
/* ECIES disabled
int cryptoMessageEncrypt(curve_point *pubkey, const uint8_t *msg, size_t
msg_size, bool display_only, uint8_t *nonce, size_t *nonce_len, uint8_t
*payload, size_t *payload_len, uint8_t *hmac, size_t *hmac_len, const uint8_t
*privkey, const uint8_t *address_raw);
int cryptoMessageDecrypt(curve_point *nonce, uint8_t *payload, size_t
payload_len, const uint8_t *hmac, size_t hmac_len, const uint8_t *privkey,
uint8_t *msg, size_t *msg_len, bool *display_only, bool *signing, uint8_t
*address_raw);
*/
const HDNode *cryptoMultisigPubkey(const CoinInfo *coin, const HDNode *cryptoMultisigPubkey(const CoinInfo *coin,
const MultisigRedeemScriptType *multisig, const MultisigRedeemScriptType *multisig,
uint32_t index); uint32_t index);