+__owur int HMAC_Init(HMAC_CTX *ctx, const void *key, int len,
+ const EVP_MD *md); /* deprecated */
+/*__owur*/ int HMAC_Init_ex(HMAC_CTX *ctx, const void *key, int len,
+ const EVP_MD *md, ENGINE *impl);
+/*__owur*/ int HMAC_Update(HMAC_CTX *ctx, const unsigned char *data, size_t len);
+/*__owur*/ int HMAC_Final(HMAC_CTX *ctx, unsigned char *md, unsigned int *len);
+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);
+__owur int HMAC_CTX_copy(HMAC_CTX *dctx, HMAC_CTX *sctx);