48 static int hkdf_extract(struct crypto_shash *hmac_tfm, const u8 *ikm,  in hkdf_extract()  argument
54 	err = crypto_shash_setkey(hmac_tfm, default_salt, HKDF_HASHLEN);  in hkdf_extract()
58 	return crypto_shash_tfm_digest(hmac_tfm, ikm, ikmlen, prk);  in hkdf_extract()
71 	struct crypto_shash *hmac_tfm;  in fscrypt_init_hkdf()  local
75 	hmac_tfm = crypto_alloc_shash(HKDF_HMAC_ALG, 0, 0);  in fscrypt_init_hkdf()
76 	if (IS_ERR(hmac_tfm)) {  in fscrypt_init_hkdf()
78 			    PTR_ERR(hmac_tfm));  in fscrypt_init_hkdf()
79 		return PTR_ERR(hmac_tfm);  in fscrypt_init_hkdf()
82 	if (WARN_ON_ONCE(crypto_shash_digestsize(hmac_tfm) != sizeof(prk))) {  in fscrypt_init_hkdf()
87 	err = hkdf_extract(hmac_tfm, master_key, master_key_size, prk);  in fscrypt_init_hkdf()
91 	err = crypto_shash_setkey(hmac_tfm, prk, sizeof(prk));  in fscrypt_init_hkdf()
95 	hkdf->hmac_tfm = hmac_tfm;  in fscrypt_init_hkdf()
99 	crypto_free_shash(hmac_tfm);  in fscrypt_init_hkdf()
120 	SHASH_DESC_ON_STACK(desc, hkdf->hmac_tfm);  in fscrypt_hkdf_expand()
131 	desc->tfm = hkdf->hmac_tfm;  in fscrypt_hkdf_expand()
181 	crypto_free_shash(hkdf->hmac_tfm);  in fscrypt_destroy_hkdf()