import t, c
from openssl.types import *

# ============================================================
# openssl/hmac.vp — HMAC（一次性 + 上下文）
# 对应头文件: hmac.h
# ============================================================

# ---- 一次性 HMAC ----
# unsigned char *HMAC(const EVP_MD *evp_md, const void *key, int key_len,
#     const unsigned char *d, size_t n, unsigned char *md, unsigned int *md_len)
extern def HMAC(evp_md: EvpMdPtr, key: bytes, key_len: int,
                d: bytes, n: t.CSizeT, md: bytes, md_len: bytes) -> bytes

# ---- 上下文增量 HMAC（OpenSSL 3.x 提供）----
# HMAC_CTX *HMAC_CTX_new(void)
extern def HMAC_CTX_new() -> HmacCtxPtr
# void HMAC_CTX_free(HMAC_CTX *ctx)
extern def HMAC_CTX_free(ctx: HmacCtxPtr)
# int HMAC_Init_ex(HMAC_CTX *ctx, const void *key, int len, const EVP_MD *md, ENGINE *impl)
extern def HMAC_Init_ex(ctx: HmacCtxPtr, key: bytes, len: int,
                        md: EvpMdPtr, impl: bytes) -> int
# int HMAC_Update(HMAC_CTX *ctx, const unsigned char *data, size_t len)
extern def HMAC_Update(ctx: HmacCtxPtr, data: bytes, len: t.CSizeT) -> int
# int HMAC_Final(HMAC_CTX *ctx, unsigned char *md, unsigned int *len)
extern def HMAC_Final(ctx: HmacCtxPtr, md: bytes, len: bytes) -> int
# int HMAC_CTX_reset(HMAC_CTX *ctx)
extern def HMAC_CTX_reset(ctx: HmacCtxPtr) -> int
# size_t HMAC_size(const HMAC_CTX *e)
extern def HMAC_size(e: HmacCtxPtr) -> t.CSizeT
# int HMAC_CTX_copy(HMAC_CTX *dctx, HMAC_CTX *sctx)
extern def HMAC_CTX_copy(dctx: HmacCtxPtr, sctx: HmacCtxPtr) -> int