/* * Shared descriptors for ahash algorithms * * Copyright 2017 NXP * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * Neither the names of the above-listed copyright holders nor the * names of any contributors may be used to endorse or promote products * derived from this software without specific prior written permission. * * * ALTERNATIVELY, this software may be distributed under the terms of the * GNU General Public License ("GPL") as published by the Free Software * Foundation, either version 2 of that License or (at your option) any * later version. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #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");