270 static char *datablob_format(struct encrypted_key_payload *epayload,  in datablob_format()  argument
274 	u8 *iv = epayload->iv;  in datablob_format()
285 	len = sprintf(ascii_buf, "%s %s %s ", epayload->format,  in datablob_format()
286 		      epayload->master_desc, epayload->datalen);  in datablob_format()
422 static struct key *request_master_key(struct encrypted_key_payload *epayload,  in request_master_key()  argument
427 	if (!strncmp(epayload->master_desc, KEY_TRUSTED_PREFIX,  in request_master_key()
429 		mkey = request_trusted_key(epayload->master_desc +  in request_master_key()
432 	} else if (!strncmp(epayload->master_desc, KEY_USER_PREFIX,  in request_master_key()
434 		mkey = request_user_key(epayload->master_desc +  in request_master_key()
445 				epayload->master_desc);  in request_master_key()
448 				epayload->master_desc);  in request_master_key()
458 static int derived_key_encrypt(struct encrypted_key_payload *epayload,  in derived_key_encrypt()  argument
470 	encrypted_datalen = roundup(epayload->decrypted_datalen, blksize);  in derived_key_encrypt()
476 	dump_decrypted_data(epayload);  in derived_key_encrypt()
479 	sg_set_buf(&sg_in[0], epayload->decrypted_data,  in derived_key_encrypt()
480 		   epayload->decrypted_datalen);  in derived_key_encrypt()
484 	sg_set_buf(sg_out, epayload->encrypted_data, encrypted_datalen);  in derived_key_encrypt()
486 	memcpy(iv, epayload->iv, sizeof(iv));  in derived_key_encrypt()
495 		dump_encrypted_data(epayload, encrypted_datalen);  in derived_key_encrypt()
500 static int datablob_hmac_append(struct encrypted_key_payload *epayload,  in datablob_hmac_append()  argument
511 	digest = epayload->format + epayload->datablob_len;  in datablob_hmac_append()
513 			epayload->format, epayload->datablob_len);  in datablob_hmac_append()
522 static int datablob_hmac_verify(struct encrypted_key_payload *epayload,  in datablob_hmac_verify()  argument
536 	len = epayload->datablob_len;  in datablob_hmac_verify()
538 		p = epayload->master_desc;  in datablob_hmac_verify()
539 		len -= strlen(epayload->format) + 1;  in datablob_hmac_verify()
541 		p = epayload->format;  in datablob_hmac_verify()
546 	ret = crypto_memneq(digest, epayload->format + epayload->datablob_len,  in datablob_hmac_verify()
551 			  epayload->format + epayload->datablob_len,  in datablob_hmac_verify()
560 static int derived_key_decrypt(struct encrypted_key_payload *epayload,  in derived_key_decrypt()  argument
578 	encrypted_datalen = roundup(epayload->decrypted_datalen, blksize);  in derived_key_decrypt()
583 	dump_encrypted_data(epayload, encrypted_datalen);  in derived_key_decrypt()
587 	sg_set_buf(sg_in, epayload->encrypted_data, encrypted_datalen);  in derived_key_decrypt()
588 	sg_set_buf(&sg_out[0], epayload->decrypted_data,  in derived_key_decrypt()
589 		   epayload->decrypted_datalen);  in derived_key_decrypt()
592 	memcpy(iv, epayload->iv, sizeof(iv));  in derived_key_decrypt()
600 	dump_decrypted_data(epayload);  in derived_key_decrypt()
612 	struct encrypted_key_payload *epayload = NULL;  in encrypted_key_alloc()  local
656 	epayload = kzalloc(sizeof(*epayload) + payload_datalen +  in encrypted_key_alloc()
658 	if (!epayload)  in encrypted_key_alloc()
661 	epayload->payload_datalen = payload_datalen;  in encrypted_key_alloc()
662 	epayload->decrypted_datalen = decrypted_datalen;  in encrypted_key_alloc()
663 	epayload->datablob_len = datablob_len;  in encrypted_key_alloc()
664 	return epayload;  in encrypted_key_alloc()
667 static int encrypted_key_decrypt(struct encrypted_key_payload *epayload,  in encrypted_key_decrypt()  argument
680 	encrypted_datalen = roundup(epayload->decrypted_datalen, blksize);  in encrypted_key_decrypt()
686 	ret = hex2bin(epayload->iv, hex_encoded_iv, ivsize);  in encrypted_key_decrypt()
689 	ret = hex2bin(epayload->encrypted_data, hex_encoded_data,  in encrypted_key_decrypt()
694 	hmac = epayload->format + epayload->datablob_len;  in encrypted_key_decrypt()
700 	mkey = request_master_key(epayload, &master_key, &master_keylen);  in encrypted_key_decrypt()
704 	ret = datablob_hmac_verify(epayload, format, master_key, master_keylen);  in encrypted_key_decrypt()
714 	ret = derived_key_decrypt(epayload, derived_key, sizeof derived_key);  in encrypted_key_decrypt()
724 static void __ekey_init(struct encrypted_key_payload *epayload,  in __ekey_init()  argument
731 	epayload->format = epayload->payload_data + epayload->payload_datalen;  in __ekey_init()
732 	epayload->master_desc = epayload->format + format_len + 1;  in __ekey_init()
733 	epayload->datalen = epayload->master_desc + strlen(master_desc) + 1;  in __ekey_init()
734 	epayload->iv = epayload->datalen + strlen(datalen) + 1;  in __ekey_init()
735 	epayload->encrypted_data = epayload->iv + ivsize + 1;  in __ekey_init()
736 	epayload->decrypted_data = epayload->payload_data;  in __ekey_init()
739 		memcpy(epayload->format, key_format_default, format_len);  in __ekey_init()
742 			epayload->decrypted_data =  in __ekey_init()
743 				ecryptfs_get_auth_tok_key((struct ecryptfs_auth_tok *)epayload->payload_data);  in __ekey_init()
745 		memcpy(epayload->format, format, format_len);  in __ekey_init()
748 	memcpy(epayload->master_desc, master_desc, strlen(master_desc));  in __ekey_init()
749 	memcpy(epayload->datalen, datalen, strlen(datalen));  in __ekey_init()
758 static int encrypted_init(struct encrypted_key_payload *epayload,  in encrypted_init()  argument
770 		ecryptfs_fill_auth_tok((struct ecryptfs_auth_tok *)epayload->payload_data,  in encrypted_init()
774 	__ekey_init(epayload, format, master_desc, datalen);  in encrypted_init()
776 		get_random_bytes(epayload->iv, ivsize);  in encrypted_init()
778 		get_random_bytes(epayload->decrypted_data,  in encrypted_init()
779 				 epayload->decrypted_datalen);  in encrypted_init()
781 		ret = encrypted_key_decrypt(epayload, format, hex_encoded_iv);  in encrypted_init()
796 	struct encrypted_key_payload *epayload = NULL;  in encrypted_instantiate()  local
818 	epayload = encrypted_key_alloc(key, format, master_desc,  in encrypted_instantiate()
820 	if (IS_ERR(epayload)) {  in encrypted_instantiate()
821 		ret = PTR_ERR(epayload);  in encrypted_instantiate()
824 	ret = encrypted_init(epayload, key->description, format, master_desc,  in encrypted_instantiate()
827 		kzfree(epayload);  in encrypted_instantiate()
831 	rcu_assign_keypointer(key, epayload);  in encrypted_instantiate()
839 	struct encrypted_key_payload *epayload;  in encrypted_rcu_free()  local
841 	epayload = container_of(rcu, struct encrypted_key_payload, rcu);  in encrypted_rcu_free()
842 	kzfree(epayload);  in encrypted_rcu_free()
856 	struct encrypted_key_payload *epayload = key->payload.data[0];  in encrypted_update()  local
879 	ret = valid_master_desc(new_master_desc, epayload->master_desc);  in encrypted_update()
883 	new_epayload = encrypted_key_alloc(key, epayload->format,  in encrypted_update()
884 					   new_master_desc, epayload->datalen);  in encrypted_update()
890 	__ekey_init(new_epayload, epayload->format, new_master_desc,  in encrypted_update()
891 		    epayload->datalen);  in encrypted_update()
893 	memcpy(new_epayload->iv, epayload->iv, ivsize);  in encrypted_update()
894 	memcpy(new_epayload->payload_data, epayload->payload_data,  in encrypted_update()
895 	       epayload->payload_datalen);  in encrypted_update()
898 	call_rcu(&epayload->rcu, encrypted_rcu_free);  in encrypted_update()
915 	struct encrypted_key_payload *epayload;  in encrypted_read()  local
924 	epayload = dereference_key_locked(key);  in encrypted_read()
927 	asciiblob_len = epayload->datablob_len + ivsize + 1  in encrypted_read()
928 	    + roundup(epayload->decrypted_datalen, blksize)  in encrypted_read()
934 	mkey = request_master_key(epayload, &master_key, &master_keylen);  in encrypted_read()
942 	ret = derived_key_encrypt(epayload, derived_key, sizeof derived_key);  in encrypted_read()
946 	ret = datablob_hmac_append(epayload, master_key, master_keylen);  in encrypted_read()
950 	ascii_buf = datablob_format(epayload, asciiblob_len);  in encrypted_read()