1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * CAAM/SEC 4.x definitions for handling key-generation jobs
4 *
5 * Copyright 2008-2011 Freescale Semiconductor, Inc.
6 *
7 */
8
9 /**
10 * split_key_len - Compute MDHA split key length for a given algorithm
11 * @hash: Hashing algorithm selection, one of OP_ALG_ALGSEL_* - MD5, SHA1,
12 * SHA224, SHA384, SHA512.
13 *
14 * Return: MDHA split key length
15 */
16 static inline u32 split_key_len(u32 hash)
17 {
18 /* Sizes for MDHA pads (*not* keys): MD5, SHA1, 224, 256, 384, 512 */
19 static const u8 mdpadlen[] = { 16, 20, 32, 32, 64, 64 };
20 u32 idx;
21
22 idx = (hash & OP_ALG_ALGSEL_SUBMASK) >> OP_ALG_ALGSEL_SHIFT;
23
24 return (u32)(mdpadlen[idx] * 2);
25 }
26
27 /**
28 * split_key_pad_len - Compute MDHA split key pad length for a given algorithm
29 * @hash: Hashing algorithm selection, one of OP_ALG_ALGSEL_* - MD5, SHA1,
30 * SHA224, SHA384, SHA512.
31 *
32 * Return: MDHA split key pad length
33 */
34 static inline u32 split_key_pad_len(u32 hash)
35 {
36 return ALIGN(split_key_len(hash), 16);
37 }
38
39 struct split_key_result {
40 struct completion completion;
41 int err;
42 };
43
44 void split_key_done(struct device *dev, u32 *desc, u32 err, void *context);
45
46 int gen_split_key(struct device *jrdev, u8 *key_out,
47 struct alginfo * const adata, const u8 *key_in, u32 keylen,
48 int max_keylen);