chore(legacy): drop unused ECIES code

[no changelog]

legacy/firmware/crypto.c

@@ -254,129 +254,6 @@ int cryptoMessageVerify(const CoinInfo *coin, const uint8_t *message,
   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 MultisigRedeemScriptType *multisig,
                                    uint32_t index) {

legacy/firmware/crypto.h

@@ -62,18 +62,6 @@ int cryptoMessageVerify(const CoinInfo *coin, const uint8_t *message,
                         size_t message_len, const char *address,
                         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 MultisigRedeemScriptType *multisig,
                                    uint32_t index);