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// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
/*
* Shared descriptors for ahash algorithms
*
* Copyright 2017 NXP
*/
#include "compat.h"
#include "desc_constr.h"
#include "caamhash_desc.h"
/**
* cnstr_shdsc_ahash - ahash shared descriptor
* @desc: pointer to buffer used for descriptor construction
* @adata: pointer to authentication transform definitions.
* A split key is required for SEC Era < 6; the size of the split key
* is specified in this case.
* Valid algorithm values - one of OP_ALG_ALGSEL_{MD5, SHA1, SHA224,
* SHA256, SHA384, SHA512}.
* @state: algorithm state OP_ALG_AS_{INIT, FINALIZE, INITFINALIZE, UPDATE}
* @digestsize: algorithm's digest size
* @ctx_len: size of Context Register
* @import_ctx: true if previous Context Register needs to be restored
* must be true for ahash update and final
* must be false for for ahash first and digest
* @era: SEC Era
*/
void cnstr_shdsc_ahash(u32 * const desc, struct alginfo *adata, u32 state,
int digestsize, int ctx_len, bool import_ctx, int era)
{
u32 op = adata->algtype;
init_sh_desc(desc, HDR_SHARE_SERIAL);
/* Append key if it has been set; ahash update excluded */
if (state != OP_ALG_AS_UPDATE && adata->keylen) {
u32 *skip_key_load;
/* Skip key loading if already shared */
skip_key_load = append_jump(desc, JUMP_JSL | JUMP_TEST_ALL |
JUMP_COND_SHRD);
if (era < 6)
append_key_as_imm(desc, adata->key_virt,
adata->keylen_pad,
adata->keylen, CLASS_2 |
KEY_DEST_MDHA_SPLIT | KEY_ENC);
else
append_proto_dkp(desc, adata);
set_jump_tgt_here(desc, skip_key_load);
op |= OP_ALG_AAI_HMAC_PRECOMP;
}
/* If needed, import context from software */
if (import_ctx)
append_seq_load(desc, ctx_len, LDST_CLASS_2_CCB |
LDST_SRCDST_BYTE_CONTEXT);
/* Class 2 operation */
append_operation(desc, op | state | OP_ALG_ENCRYPT);
/*
* Load from buf and/or src and write to req->result or state->context
* Calculate remaining bytes to read
*/
append_math_add(desc, VARSEQINLEN, SEQINLEN, REG0, CAAM_CMD_SZ);
/* Read remaining bytes */
append_seq_fifo_load(desc, 0, FIFOLD_CLASS_CLASS2 | FIFOLD_TYPE_LAST2 |
FIFOLD_TYPE_MSG | KEY_VLF);
/* Store class2 context bytes */
append_seq_store(desc, digestsize, LDST_CLASS_2_CCB |
LDST_SRCDST_BYTE_CONTEXT);
}
EXPORT_SYMBOL(cnstr_shdsc_ahash);
MODULE_LICENSE("Dual BSD/GPL");
MODULE_DESCRIPTION("FSL CAAM ahash descriptors support");
MODULE_AUTHOR("NXP Semiconductors");
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