drivers/crypto/caam/key_gen.h

   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);