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7e0880b9fb
Offload split key generation in CAAM engine, using DKP. DKP is supported starting with Era 6. Note that the way assoclen is transmitted from the job descriptor to the shared descriptor changes - DPOVRD register is used instead of MATH3 (where available), since DKP protocol thrashes the MATH registers. The replacement of MDHA split key generation with DKP has the side effect of the crypto engine writing the authentication key, and thus the DMA mapping direction for the buffer holding the key has to change from DMA_TO_DEVICE to DMA_BIDIRECTIONAL. There are two cases: -key is inlined in descriptor - descriptor buffer mapping changes -key is referenced - key buffer mapping changes Signed-off-by: Horia Geantă <horia.geanta@nxp.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
48 lines
1.3 KiB
C
48 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* CAAM/SEC 4.x definitions for handling key-generation jobs
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*
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* Copyright 2008-2011 Freescale Semiconductor, Inc.
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*
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*/
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/**
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* split_key_len - Compute MDHA split key length for a given algorithm
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* @hash: Hashing algorithm selection, one of OP_ALG_ALGSEL_* - MD5, SHA1,
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* SHA224, SHA384, SHA512.
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*
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* Return: MDHA split key length
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*/
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static inline u32 split_key_len(u32 hash)
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{
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/* Sizes for MDHA pads (*not* keys): MD5, SHA1, 224, 256, 384, 512 */
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static const u8 mdpadlen[] = { 16, 20, 32, 32, 64, 64 };
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u32 idx;
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idx = (hash & OP_ALG_ALGSEL_SUBMASK) >> OP_ALG_ALGSEL_SHIFT;
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return (u32)(mdpadlen[idx] * 2);
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}
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/**
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* split_key_pad_len - Compute MDHA split key pad length for a given algorithm
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* @hash: Hashing algorithm selection, one of OP_ALG_ALGSEL_* - MD5, SHA1,
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* SHA224, SHA384, SHA512.
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*
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* Return: MDHA split key pad length
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*/
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static inline u32 split_key_pad_len(u32 hash)
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{
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return ALIGN(split_key_len(hash), 16);
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}
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struct split_key_result {
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struct completion completion;
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int err;
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};
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void split_key_done(struct device *dev, u32 *desc, u32 err, void *context);
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int gen_split_key(struct device *jrdev, u8 *key_out,
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struct alginfo * const adata, const u8 *key_in, u32 keylen,
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int max_keylen);
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