mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-12-23 14:58:09 +00:00
72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
#include <string.h>
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#include "bignum.h"
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#include "hmac.h"
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#include "ecdsa.h"
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#include "bip32.h"
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void hdnode_from_pub(uint32_t version, uint32_t depth, uint32_t fingerprint, uint32_t child_num, uint8_t *chain_code, uint8_t *public_key, HDNode *out)
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{
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out->version = version;
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out->depth = depth;
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out->fingerprint = fingerprint;
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out->child_num = child_num;
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memcpy(out->chain_code, chain_code, 32);
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memcpy(out->public_key, public_key, 33);
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memset(out->private_key, 0, 32);
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hdnode_fill_address(out, 0x00);
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}
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void hdnode_from_seed(uint8_t *seed, int seed_len, HDNode *out)
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{
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out->version = 0x0488ADE4; // main-net
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out->depth = 0;
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out->fingerprint = 0x00000000;
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out->child_num = 0;
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// this can be done because private_key[32] and chain_code[32]
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// form a continuous 64 byte block in the memory
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hmac_sha512((uint8_t *)"Bitcoin seed", 12, seed, seed_len, out->private_key);
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hdnode_fill_public_key(out);
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hdnode_fill_address(out, 0x00);
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}
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void hdnode_descent(HDNode *inout, uint32_t i)
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{
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uint8_t data[1 + 32 + 4];
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bignum256 a, b;
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if (i & 0x80000000) { // private derivation
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data[0] = 0;
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memcpy(data + 1, inout->private_key, 32);
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} else { // public derivation
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memcpy(data, inout->public_key, 33);
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}
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write_be(data + 33, i);
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bn_read_be(inout->private_key, &a);
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// this can be done because private_key[32] and chain_code[32]
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// form a continuous 64 byte block in the memory
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hmac_sha512(inout->chain_code, 32, data, sizeof(data), inout->private_key);
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bn_read_be(inout->private_key, &b);
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bn_addmod(&a, &b, &order256k1);
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inout->depth++;
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inout->child_num = i;
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bn_write_be(&a, inout->private_key);
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hdnode_fill_public_key(inout);
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hdnode_fill_address(inout, 0x00);
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}
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void hdnode_fill_public_key(HDNode *xprv)
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{
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ecdsa_get_public_key33(xprv->private_key, xprv->public_key);
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}
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void hdnode_fill_address(HDNode *xprv, uint8_t version)
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{
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ecdsa_get_address(xprv->public_key, version, xprv->address);
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}
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