243     bootutil_hmac_sha256_context hmac;  in hkdf()  local
261     bootutil_hmac_sha256_init(&hmac);  in hkdf()
264     rc = bootutil_hmac_sha256_set_key(&hmac, salt, BOOTUTIL_CRYPTO_SHA256_DIGEST_SIZE);  in hkdf()
269     rc = bootutil_hmac_sha256_update(&hmac, ikm, ikm_len);  in hkdf()
274     rc = bootutil_hmac_sha256_finish(&hmac, prk, BOOTUTIL_CRYPTO_SHA256_DIGEST_SIZE);  in hkdf()
279     bootutil_hmac_sha256_drop(&hmac);  in hkdf()
289         bootutil_hmac_sha256_init(&hmac);  in hkdf()
291         rc = bootutil_hmac_sha256_set_key(&hmac, prk, BOOTUTIL_CRYPTO_SHA256_DIGEST_SIZE);  in hkdf()
299             rc = bootutil_hmac_sha256_update(&hmac, T, BOOTUTIL_CRYPTO_SHA256_DIGEST_SIZE);  in hkdf()
305         rc = bootutil_hmac_sha256_update(&hmac, info, info_len);  in hkdf()
310         rc = bootutil_hmac_sha256_update(&hmac, &counter, 1);  in hkdf()
315         rc = bootutil_hmac_sha256_finish(&hmac, T, BOOTUTIL_CRYPTO_SHA256_DIGEST_SIZE);  in hkdf()
320         bootutil_hmac_sha256_drop(&hmac);  in hkdf()
334     bootutil_hmac_sha256_drop(&hmac);  in hkdf()
448     bootutil_hmac_sha256_context hmac;  in boot_decrypt_key()  local
571     bootutil_hmac_sha256_init(&hmac);  in boot_decrypt_key()
573     rc = bootutil_hmac_sha256_set_key(&hmac, &derived_key[BOOT_ENC_KEY_SIZE], 32);  in boot_decrypt_key()
575         (void)bootutil_hmac_sha256_drop(&hmac);  in boot_decrypt_key()
579     rc = bootutil_hmac_sha256_update(&hmac, &buf[EC_CIPHERKEY_INDEX], BOOT_ENC_KEY_SIZE);  in boot_decrypt_key()
581         (void)bootutil_hmac_sha256_drop(&hmac);  in boot_decrypt_key()
586     rc = bootutil_hmac_sha256_finish(&hmac, tag, BOOTUTIL_CRYPTO_SHA256_DIGEST_SIZE);  in boot_decrypt_key()
588         (void)bootutil_hmac_sha256_drop(&hmac);  in boot_decrypt_key()
593         (void)bootutil_hmac_sha256_drop(&hmac);  in boot_decrypt_key()
597     bootutil_hmac_sha256_drop(&hmac);  in boot_decrypt_key()