20 static unsigned char *HKDF(const EVP_MD *evp_md,
26 static unsigned char *HKDF_Extract(const EVP_MD *evp_md,
31 static unsigned char *HKDF_Expand(const EVP_MD *evp_md,
257 static unsigned char *HKDF(const EVP_MD *evp_md,  in HKDF()  argument
267     if (!HKDF_Extract(evp_md, salt, salt_len, key, key_len, prk, &prk_len))  in HKDF()
270     ret = HKDF_Expand(evp_md, prk, prk_len, info, info_len, okm, okm_len);  in HKDF()
276 static unsigned char *HKDF_Extract(const EVP_MD *evp_md,  in HKDF_Extract()  argument
283     if (!HMAC(evp_md, salt, salt_len, key, key_len, prk, &tmp_len))  in HKDF_Extract()
290 static unsigned char *HKDF_Expand(const EVP_MD *evp_md,  in HKDF_Expand()  argument
302     size_t done_len = 0, dig_len = EVP_MD_size(evp_md);  in HKDF_Expand()
314     if (!HMAC_Init_ex(hmac, prk, prk_len, evp_md, NULL))  in HKDF_Expand()