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src/EV__Nats.xs  view on Meta::CPAN

        return -1;
    if (raw_len < 36) return -1; /* prefix(2) + seed(32) + CRC(2) */

    /* Validate CRC16 */
    uint16_t expected_crc = (uint16_t)raw[raw_len - 2] | ((uint16_t)raw[raw_len - 1] << 8);
    uint16_t actual_crc = nats_crc16(raw, raw_len - 2);
    if (expected_crc != actual_crc) return -1;

    unsigned char *seed = raw + 2;

    EVP_PKEY *pkey = EVP_PKEY_new_raw_private_key(EVP_PKEY_ED25519, NULL, seed, 32);
    if (!pkey) return -1;

    EVP_MD_CTX *ctx = EVP_MD_CTX_new();
    if (!ctx) { EVP_PKEY_free(pkey); return -1; }

    unsigned char sig[64];
    size_t sig_len = sizeof(sig);

    int ok = (EVP_DigestSignInit(ctx, NULL, NULL, NULL, pkey) == 1 &&
              EVP_DigestSign(ctx, sig, &sig_len, (const unsigned char *)nonce, nonce_len) == 1);

src/EV__Nats.xs  view on Meta::CPAN

    if (nats_base32_decode(seed_encoded, strlen(seed_encoded), raw, &raw_len) != 0)
        return -1;
    if (raw_len < 36) return -1;

    uint16_t expected_crc = (uint16_t)raw[raw_len - 2] | ((uint16_t)raw[raw_len - 1] << 8);
    if (nats_crc16(raw, raw_len - 2) != expected_crc) return -1;

    unsigned char *seed = raw + 2;

    EVP_PKEY *pkey = EVP_PKEY_new_raw_private_key(EVP_PKEY_ED25519, NULL, seed, 32);
    if (!pkey) return -1;

    unsigned char pub[32];
    size_t pub_len = 32;
    int ok = EVP_PKEY_get_raw_public_key(pkey, pub, &pub_len) == 1;
    EVP_PKEY_free(pkey);
    if (!ok) return -1;

    /* Derive public key prefix from seed prefix.
       Seed prefix byte encodes type in bits 3-7: User=0xD0>>3, etc.