612 lines
18 KiB
C
612 lines
18 KiB
C
#include "key_derivation.h"
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#include "pq_crypto_firmware.h"
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#include <stddef.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include "esp_random.h"
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#include "esp_log.h"
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#include "mbedtls/md.h"
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#include "mbedtls/ecp.h"
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#include "mbedtls/pk.h"
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#include "psa/crypto.h"
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#include "secp256k1.h"
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#include "secp256k1_extrakeys.h"
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#include "secp256k1_schnorrsig.h"
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static const char *KD_TAG = "key_derivation";
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#define BIP32_HARDENED_FLAG 0x80000000u
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typedef struct {
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uint8_t priv[32];
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uint8_t chain[32];
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uint8_t pub[33];
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} hd_key_t;
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static int hmac_sha512(const uint8_t *key,
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size_t key_len,
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const uint8_t *data,
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size_t data_len,
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uint8_t out[64])
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{
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const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type(MBEDTLS_MD_SHA512);
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if (md_info == NULL) {
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return -1;
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}
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if (mbedtls_md_hmac(md_info, key, key_len, data, data_len, out) != 0) {
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return -1;
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}
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return 0;
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}
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static secp256k1_context *create_context(void)
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{
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uint8_t rand32[32] = {0};
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secp256k1_context *ctx = secp256k1_context_create(SECP256K1_CONTEXT_SIGN | SECP256K1_CONTEXT_VERIFY);
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if (ctx == NULL) {
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return NULL;
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}
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esp_fill_random(rand32, sizeof(rand32));
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if (!secp256k1_context_randomize(ctx, rand32)) {
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memset(rand32, 0, sizeof(rand32));
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secp256k1_context_destroy(ctx);
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return NULL;
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}
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memset(rand32, 0, sizeof(rand32));
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return ctx;
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}
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static int compute_compressed_pubkey(const secp256k1_context *ctx, const uint8_t priv[32], uint8_t pub33[33])
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{
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secp256k1_pubkey pubkey;
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size_t out_len = 33;
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if (!secp256k1_ec_pubkey_create(ctx, &pubkey, priv)) {
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return -1;
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}
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if (!secp256k1_ec_pubkey_serialize(ctx, pub33, &out_len, &pubkey, SECP256K1_EC_COMPRESSED)) {
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return -1;
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}
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if (out_len != 33) {
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return -1;
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}
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return 0;
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}
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static int bip32_master_from_seed(const secp256k1_context *ctx, const uint8_t seed[64], hd_key_t *master)
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{
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static const uint8_t kBitcoinSeed[] = "Bitcoin seed";
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uint8_t i64[64] = {0};
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if (hmac_sha512(kBitcoinSeed, sizeof(kBitcoinSeed) - 1, seed, 64, i64) != 0) {
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return -1;
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}
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memcpy(master->priv, i64, 32);
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memcpy(master->chain, i64 + 32, 32);
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memset(i64, 0, sizeof(i64));
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if (!secp256k1_ec_seckey_verify(ctx, master->priv)) {
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return -1;
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}
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return compute_compressed_pubkey(ctx, master->priv, master->pub);
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}
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static int bip32_ckd_priv(const secp256k1_context *ctx,
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const hd_key_t *parent,
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uint32_t index,
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hd_key_t *child)
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{
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uint8_t data[37] = {0};
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uint8_t i64[64] = {0};
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if (index & BIP32_HARDENED_FLAG) {
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data[0] = 0x00;
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memcpy(data + 1, parent->priv, 32);
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} else {
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memcpy(data, parent->pub, 33);
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}
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data[33] = (uint8_t)((index >> 24) & 0xFF);
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data[34] = (uint8_t)((index >> 16) & 0xFF);
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data[35] = (uint8_t)((index >> 8) & 0xFF);
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data[36] = (uint8_t)(index & 0xFF);
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if (hmac_sha512(parent->chain, 32, data, sizeof(data), i64) != 0) {
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return -1;
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}
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memcpy(child->priv, parent->priv, 32);
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memcpy(child->chain, i64 + 32, 32);
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if (!secp256k1_ec_seckey_tweak_add(ctx, child->priv, i64)) {
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memset(i64, 0, sizeof(i64));
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return -1;
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}
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memset(i64, 0, sizeof(i64));
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if (!secp256k1_ec_seckey_verify(ctx, child->priv)) {
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return -1;
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}
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return compute_compressed_pubkey(ctx, child->priv, child->pub);
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}
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static int derive_nostr_key_internal(const uint8_t seed[64], uint32_t nostr_index, uint8_t privkey[32], uint8_t pubkey[32])
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{
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const uint32_t path[5] = {
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44u | BIP32_HARDENED_FLAG,
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1237u | BIP32_HARDENED_FLAG,
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0u | BIP32_HARDENED_FLAG,
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0u,
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nostr_index,
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};
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secp256k1_context *ctx = NULL;
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hd_key_t node;
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if (seed == NULL || privkey == NULL || pubkey == NULL) {
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return -1;
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}
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memset(&node, 0, sizeof(node));
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ctx = create_context();
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if (ctx == NULL) {
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return -1;
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}
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if (bip32_master_from_seed(ctx, seed, &node) != 0) {
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secp256k1_context_destroy(ctx);
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return -1;
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}
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for (size_t i = 0; i < sizeof(path) / sizeof(path[0]); ++i) {
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hd_key_t next;
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memset(&next, 0, sizeof(next));
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if (bip32_ckd_priv(ctx, &node, path[i], &next) != 0) {
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memset(&node, 0, sizeof(node));
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secp256k1_context_destroy(ctx);
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return -1;
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}
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memset(&node, 0, sizeof(node));
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node = next;
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}
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memcpy(privkey, node.priv, 32);
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{
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secp256k1_keypair kp;
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secp256k1_xonly_pubkey xonly;
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if (!secp256k1_keypair_create(ctx, &kp, node.priv)) {
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memset(&node, 0, sizeof(node));
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secp256k1_context_destroy(ctx);
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return -1;
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}
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if (!secp256k1_keypair_xonly_pub(ctx, &xonly, NULL, &kp)) {
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memset(&node, 0, sizeof(node));
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secp256k1_context_destroy(ctx);
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return -1;
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}
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if (!secp256k1_xonly_pubkey_serialize(ctx, pubkey, &xonly)) {
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memset(&node, 0, sizeof(node));
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secp256k1_context_destroy(ctx);
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return -1;
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}
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}
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memset(&node, 0, sizeof(node));
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secp256k1_context_destroy(ctx);
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return 0;
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}
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int derive_nostr_key(const uint8_t seed[64], uint8_t privkey[32], uint8_t pubkey[32])
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{
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return derive_nostr_key_internal(seed, 0u, privkey, pubkey);
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}
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int derive_nostr_key_index(const uint8_t seed[64], uint32_t nostr_index, uint8_t privkey[32], uint8_t pubkey[32])
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{
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return derive_nostr_key_internal(seed, nostr_index, privkey, pubkey);
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}
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int schnorr_sign32(const uint8_t privkey[32], const uint8_t msg32[32], uint8_t sig64[64])
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{
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secp256k1_context *ctx = NULL;
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secp256k1_keypair kp;
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uint8_t aux[32] = {0};
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if (privkey == NULL || msg32 == NULL || sig64 == NULL) {
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return -1;
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}
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ctx = create_context();
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if (ctx == NULL) {
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return -1;
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}
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if (!secp256k1_keypair_create(ctx, &kp, privkey)) {
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secp256k1_context_destroy(ctx);
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return -1;
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}
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esp_fill_random(aux, sizeof(aux));
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if (!secp256k1_schnorrsig_sign32(ctx, sig64, msg32, &kp, aux)) {
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memset(aux, 0, sizeof(aux));
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secp256k1_context_destroy(ctx);
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return -1;
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}
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memset(aux, 0, sizeof(aux));
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secp256k1_context_destroy(ctx);
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return 0;
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}
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/* ====================================================================
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* Phase 7: ed25519, x25519, and post-quantum key derivation
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* ==================================================================== */
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/* SLIP-0010 all-hardened derivation for ed25519/x25519.
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*
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* SLIP-0010 uses HMAC-SHA512 with a "ed25519 seed" or curve-specific key
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* for the master key, and all derivation steps are hardened (the parent
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* private key is prepended to the index data).
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*
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* For ed25519/x25519, the derived 512-bit HMAC output is split:
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* - first 32 bytes = private key (the scalar)
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* - last 32 bytes = chain code
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*
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* The private key IS the ed25519/x25519 secret — no tweak-add is needed
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* (unlike secp256k1 BIP-32 where the child priv = parent_priv + HMAC).
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*/
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/* SLIP-0010 master key from seed: HMAC-SHA512(key="ed25519 seed", data=seed) */
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static int slip10_master_from_seed(const uint8_t seed[64],
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uint8_t priv[32], uint8_t chain[32]) {
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static const uint8_t kEd25519Seed[] = "ed25519 seed";
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uint8_t i64[64] = {0};
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if (hmac_sha512(kEd25519Seed, sizeof(kEd25519Seed) - 1,
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seed, 64, i64) != 0) {
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return -1;
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}
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memcpy(priv, i64, 32);
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memcpy(chain, i64 + 32, 32);
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memset(i64, 0, sizeof(i64));
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return 0;
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}
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/* SLIP-0010 hardened child derivation:
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* HMAC-SHA512(key=chain, data=0x00 || priv || index_be32) */
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static int slip10_ckd_priv(const uint8_t parent_priv[32],
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const uint8_t parent_chain[32],
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uint32_t index,
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uint8_t child_priv[32],
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uint8_t child_chain[32]) {
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uint8_t data[37];
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uint8_t i64[64] = {0};
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/* Hardened derivation: 0x00 || priv || index (big-endian) */
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data[0] = 0x00;
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memcpy(data + 1, parent_priv, 32);
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data[33] = (uint8_t)((index >> 24) & 0xFF);
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data[34] = (uint8_t)((index >> 16) & 0xFF);
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data[35] = (uint8_t)((index >> 8) & 0xFF);
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data[36] = (uint8_t)(index & 0xFF);
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if (hmac_sha512(parent_chain, 32, data, sizeof(data), i64) != 0) {
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memset(data, 0, sizeof(data));
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return -1;
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}
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memcpy(child_priv, i64, 32);
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memcpy(child_chain, i64 + 32, 32);
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memset(data, 0, sizeof(data));
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memset(i64, 0, sizeof(i64));
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return 0;
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}
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/* Derive a 32-byte seed via SLIP-0010 all-hardened path.
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* path[] is an array of hardened indices (the caller sets the hardened flag).
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* Returns the final 32-byte private material in `out_seed`. */
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static int slip10_derive_seed(const uint8_t seed[64],
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const uint32_t *path, size_t path_len,
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uint8_t out_seed[32]) {
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uint8_t priv[32], chain[32], next_priv[32], next_chain[32];
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size_t i;
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if (slip10_master_from_seed(seed, priv, chain) != 0) {
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return -1;
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}
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for (i = 0; i < path_len; i++) {
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if (slip10_ckd_priv(priv, chain, path[i],
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next_priv, next_chain) != 0) {
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memset(priv, 0, sizeof(priv));
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memset(chain, 0, sizeof(chain));
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return -1;
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}
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memcpy(priv, next_priv, 32);
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memcpy(chain, next_chain, 32);
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}
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memcpy(out_seed, priv, 32);
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memset(priv, 0, sizeof(priv));
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memset(chain, 0, sizeof(chain));
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memset(next_priv, 0, sizeof(next_priv));
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memset(next_chain, 0, sizeof(next_chain));
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return 0;
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}
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/* --- ed25519 --- */
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int derive_ed25519_key(const uint8_t seed[64], uint32_t index,
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uint8_t privkey[32], uint8_t pubkey[32]) {
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/* m/44'/102001'/<index>'/0'/0' — all hardened (SLIP-0010) */
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const uint32_t path[5] = {
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44u | BIP32_HARDENED_FLAG,
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102001u | BIP32_HARDENED_FLAG,
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index | BIP32_HARDENED_FLAG,
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0u | BIP32_HARDENED_FLAG,
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0u | BIP32_HARDENED_FLAG,
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};
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uint8_t derived_seed[32];
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if (seed == NULL || privkey == NULL || pubkey == NULL) {
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return -1;
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}
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if (slip10_derive_seed(seed, path, 5, derived_seed) != 0) {
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return -1;
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}
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/* The SLIP-0010 derived 32 bytes IS the ed25519 private key. */
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memcpy(privkey, derived_seed, 32);
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/* Derive the ed25519 public key via PSA crypto (IDF v5.x mbedtls has no
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* mbedtls_ed25519_make_public). Import the private key, export the pub. */
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psa_status_t status;
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psa_key_id_t key_id = 0;
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psa_key_attributes_t attrs = PSA_KEY_ATTRIBUTES_INIT;
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size_t pub_len = 0;
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psa_crypto_init();
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psa_set_key_type(&attrs, PSA_KEY_TYPE_ECC_KEY_PAIR(PSA_ECC_FAMILY_TWISTED_EDWARDS));
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psa_set_key_bits(&attrs, 255);
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psa_set_key_usage_flags(&attrs, PSA_KEY_USAGE_EXPORT | PSA_KEY_USAGE_SIGN_MESSAGE);
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psa_set_key_algorithm(&attrs, PSA_ALG_PURE_EDDSA);
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status = psa_import_key(&attrs, privkey, 32, &key_id);
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if (status != PSA_SUCCESS) {
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ESP_LOGE(KD_TAG, "ed25519 psa_import failed: %d", (int)status);
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memset(derived_seed, 0, sizeof(derived_seed));
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memset(privkey, 0, 32);
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return -1;
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}
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status = psa_export_public_key(key_id, pubkey, 32, &pub_len);
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psa_destroy_key(key_id);
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if (status != PSA_SUCCESS || pub_len != 32) {
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ESP_LOGE(KD_TAG, "ed25519 psa_export_public failed: %d", (int)status);
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memset(derived_seed, 0, sizeof(derived_seed));
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memset(privkey, 0, 32);
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return -1;
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}
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memset(derived_seed, 0, sizeof(derived_seed));
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return 0;
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}
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/* ed25519 sign via PSA (PureEdDSA — signs the raw message, not pre-hashed). */
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int ed25519_sign32(const uint8_t privkey[32], const uint8_t msg32[32],
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uint8_t sig64[64]) {
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return ed25519_sign_msg(privkey, msg32, 32, sig64);
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}
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int ed25519_sign_msg(const uint8_t privkey[32], const uint8_t *msg, size_t msg_len,
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uint8_t sig64[64]) {
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psa_status_t status;
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psa_key_id_t key_id = 0;
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psa_key_attributes_t attrs = PSA_KEY_ATTRIBUTES_INIT;
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size_t sig_len = 0;
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psa_crypto_init();
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psa_set_key_type(&attrs, PSA_KEY_TYPE_ECC_KEY_PAIR(PSA_ECC_FAMILY_TWISTED_EDWARDS));
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psa_set_key_bits(&attrs, 255);
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psa_set_key_usage_flags(&attrs, PSA_KEY_USAGE_SIGN_MESSAGE);
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psa_set_key_algorithm(&attrs, PSA_ALG_PURE_EDDSA);
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status = psa_import_key(&attrs, privkey, 32, &key_id);
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if (status != PSA_SUCCESS) {
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ESP_LOGE(KD_TAG, "ed25519 sign psa_import failed: %d", (int)status);
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return -1;
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}
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status = psa_sign_message(key_id, PSA_ALG_PURE_EDDSA,
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msg, msg_len, sig64, 64, &sig_len);
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psa_destroy_key(key_id);
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if (status != PSA_SUCCESS || sig_len != 64) {
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ESP_LOGE(KD_TAG, "ed25519 psa_sign_message failed: %d", (int)status);
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return -1;
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}
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return 0;
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}
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int ed25519_verify_msg(const uint8_t *sig, size_t sig_len,
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const uint8_t *msg, size_t msg_len,
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const uint8_t pubkey[32]) {
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psa_status_t status;
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psa_key_id_t key_id = 0;
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psa_key_attributes_t attrs = PSA_KEY_ATTRIBUTES_INIT;
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psa_crypto_init();
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psa_set_key_type(&attrs, PSA_KEY_TYPE_ECC_PUBLIC_KEY(PSA_ECC_FAMILY_TWISTED_EDWARDS));
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psa_set_key_bits(&attrs, 255);
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psa_set_key_usage_flags(&attrs, PSA_KEY_USAGE_VERIFY_MESSAGE);
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psa_set_key_algorithm(&attrs, PSA_ALG_PURE_EDDSA);
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status = psa_import_key(&attrs, pubkey, 32, &key_id);
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if (status != PSA_SUCCESS) {
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ESP_LOGE(KD_TAG, "ed25519 verify psa_import failed: %d", (int)status);
|
|
return -1;
|
|
}
|
|
status = psa_verify_message(key_id, PSA_ALG_PURE_EDDSA,
|
|
msg, msg_len, sig, sig_len);
|
|
psa_destroy_key(key_id);
|
|
return (status == PSA_SUCCESS) ? 0 : -1;
|
|
}
|
|
|
|
/* --- x25519 --- */
|
|
|
|
int derive_x25519_key(const uint8_t seed[64], uint32_t index,
|
|
uint8_t privkey[32], uint8_t pubkey[32]) {
|
|
/* m/44'/102002'/<index>'/0'/0' — all hardened (SLIP-0010) */
|
|
const uint32_t path[5] = {
|
|
44u | BIP32_HARDENED_FLAG,
|
|
102002u | BIP32_HARDENED_FLAG,
|
|
index | BIP32_HARDENED_FLAG,
|
|
0u | BIP32_HARDENED_FLAG,
|
|
0u | BIP32_HARDENED_FLAG,
|
|
};
|
|
uint8_t derived_seed[32];
|
|
psa_status_t status;
|
|
psa_key_id_t key_id = 0;
|
|
psa_key_attributes_t attrs = PSA_KEY_ATTRIBUTES_INIT;
|
|
size_t pub_len = 0;
|
|
|
|
if (seed == NULL || privkey == NULL || pubkey == NULL) {
|
|
return -1;
|
|
}
|
|
|
|
if (slip10_derive_seed(seed, path, 5, derived_seed) != 0) {
|
|
return -1;
|
|
}
|
|
|
|
/* The SLIP-0010 derived 32 bytes IS the x25519 private key.
|
|
* PSA imports it and exports the public key (PSA handles clamping). */
|
|
memcpy(privkey, derived_seed, 32);
|
|
memset(derived_seed, 0, sizeof(derived_seed));
|
|
|
|
psa_crypto_init();
|
|
psa_set_key_type(&attrs, PSA_KEY_TYPE_ECC_KEY_PAIR(PSA_ECC_FAMILY_MONTGOMERY));
|
|
psa_set_key_bits(&attrs, 255);
|
|
psa_set_key_usage_flags(&attrs, PSA_KEY_USAGE_EXPORT | PSA_KEY_USAGE_DERIVE);
|
|
psa_set_key_algorithm(&attrs, PSA_ALG_ECDH);
|
|
|
|
status = psa_import_key(&attrs, privkey, 32, &key_id);
|
|
if (status != PSA_SUCCESS) {
|
|
ESP_LOGE(KD_TAG, "x25519 psa_import failed: %d", (int)status);
|
|
memset(privkey, 0, 32);
|
|
return -1;
|
|
}
|
|
status = psa_export_public_key(key_id, pubkey, 32, &pub_len);
|
|
psa_destroy_key(key_id);
|
|
if (status != PSA_SUCCESS || pub_len != 32) {
|
|
ESP_LOGE(KD_TAG, "x25519 psa_export_public failed: %d", (int)status);
|
|
memset(privkey, 0, 32);
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* --- ML-DSA-65 --- */
|
|
|
|
int derive_ml_dsa_65_key(const uint8_t seed[64], uint32_t index,
|
|
uint8_t *pk, uint8_t *sk) {
|
|
/* m/44'/102003'/<index>'/0'/0' — all hardened (SLIP-0010) -> 32-byte seed */
|
|
const uint32_t path[5] = {
|
|
44u | BIP32_HARDENED_FLAG,
|
|
102003u | BIP32_HARDENED_FLAG,
|
|
index | BIP32_HARDENED_FLAG,
|
|
0u | BIP32_HARDENED_FLAG,
|
|
0u | BIP32_HARDENED_FLAG,
|
|
};
|
|
uint8_t pq_seed[32];
|
|
|
|
if (seed == NULL || pk == NULL || sk == NULL) {
|
|
return -1;
|
|
}
|
|
|
|
if (slip10_derive_seed(seed, path, 5, pq_seed) != 0) {
|
|
return -1;
|
|
}
|
|
|
|
int ret = fw_pq_ml_dsa_65_keygen(pq_seed, pk, sk);
|
|
memset(pq_seed, 0, sizeof(pq_seed));
|
|
return ret;
|
|
}
|
|
|
|
/* --- SLH-DSA-128s --- */
|
|
|
|
int derive_slh_dsa_128s_key(const uint8_t seed[64], uint32_t index,
|
|
uint8_t *pk, uint8_t *sk) {
|
|
/* m/44'/102004'/<index>'/0'/0' — all hardened (SLIP-0010) -> 32-byte seed */
|
|
const uint32_t path[5] = {
|
|
44u | BIP32_HARDENED_FLAG,
|
|
102004u | BIP32_HARDENED_FLAG,
|
|
index | BIP32_HARDENED_FLAG,
|
|
0u | BIP32_HARDENED_FLAG,
|
|
0u | BIP32_HARDENED_FLAG,
|
|
};
|
|
uint8_t pq_seed[32];
|
|
|
|
if (seed == NULL || pk == NULL || sk == NULL) {
|
|
return -1;
|
|
}
|
|
|
|
if (slip10_derive_seed(seed, path, 5, pq_seed) != 0) {
|
|
return -1;
|
|
}
|
|
|
|
ESP_LOGW(KD_TAG, "SLH-DSA-128s keygen: this takes 5-30 seconds on ESP32");
|
|
int ret = fw_pq_slh_dsa_128s_keygen(pq_seed, pk, sk);
|
|
memset(pq_seed, 0, sizeof(pq_seed));
|
|
return ret;
|
|
}
|
|
|
|
/* --- ML-KEM-768 --- */
|
|
|
|
int derive_ml_kem_768_key(const uint8_t seed[64], uint32_t index,
|
|
uint8_t *pk, uint8_t *sk) {
|
|
/* m/44'/102005'/<index>'/0'/0' — all hardened (SLIP-0010) -> 32-byte seed */
|
|
const uint32_t path[5] = {
|
|
44u | BIP32_HARDENED_FLAG,
|
|
102005u | BIP32_HARDENED_FLAG,
|
|
index | BIP32_HARDENED_FLAG,
|
|
0u | BIP32_HARDENED_FLAG,
|
|
0u | BIP32_HARDENED_FLAG,
|
|
};
|
|
uint8_t pq_seed[32];
|
|
|
|
if (seed == NULL || pk == NULL || sk == NULL) {
|
|
return -1;
|
|
}
|
|
|
|
if (slip10_derive_seed(seed, path, 5, pq_seed) != 0) {
|
|
return -1;
|
|
}
|
|
|
|
int ret = fw_pq_ml_kem_768_keygen(pq_seed, pk, sk);
|
|
memset(pq_seed, 0, sizeof(pq_seed));
|
|
return ret;
|
|
}
|