// SPDX-License-Identifier: GPL-2.0
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/*
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* CAAM/SEC 4.x functions 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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#include "compat.h"
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#include "jr.h"
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#include "error.h"
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#include "desc_constr.h"
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#include "key_gen.h"
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void split_key_done(struct device *dev, u32 *desc, u32 err,
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void *context)
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{
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struct split_key_result *res = context;
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int ecode = 0;
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dev_dbg(dev, "%s %d: err 0x%x\n", __func__, __LINE__, err);
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if (err)
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ecode = caam_jr_strstatus(dev, err);
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res->err = ecode;
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complete(&res->completion);
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}
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EXPORT_SYMBOL(split_key_done);
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/*
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get a split ipad/opad key
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Split key generation-----------------------------------------------
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[00] 0xb0810008 jobdesc: stidx=1 share=never len=8
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[01] 0x04000014 key: class2->keyreg len=20
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@0xffe01000
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[03] 0x84410014 operation: cls2-op sha1 hmac init dec
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[04] 0x24940000 fifold: class2 msgdata-last2 len=0 imm
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[05] 0xa4000001 jump: class2 local all ->1 [06]
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[06] 0x64260028 fifostr: class2 mdsplit-jdk len=40
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@0xffe04000
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*/
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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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{
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u32 *desc;
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struct split_key_result result;
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dma_addr_t dma_addr;
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unsigned int local_max;
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int ret = -ENOMEM;
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adata->keylen = split_key_len(adata->algtype & OP_ALG_ALGSEL_MASK);
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adata->keylen_pad = split_key_pad_len(adata->algtype &
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OP_ALG_ALGSEL_MASK);
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local_max = max(keylen, adata->keylen_pad);
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dev_dbg(jrdev, "split keylen %d split keylen padded %d\n",
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adata->keylen, adata->keylen_pad);
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print_hex_dump_debug("ctx.key@" __stringify(__LINE__)": ",
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DUMP_PREFIX_ADDRESS, 16, 4, key_in, keylen, 1);
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if (local_max > max_keylen)
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return -EINVAL;
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desc = kmalloc(CAAM_CMD_SZ * 6 + CAAM_PTR_SZ * 2, GFP_KERNEL | GFP_DMA);
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if (!desc) {
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dev_err(jrdev, "unable to allocate key input memory\n");
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return ret;
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}
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memcpy(key_out, key_in, keylen);
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dma_addr = dma_map_single(jrdev, key_out, local_max, DMA_BIDIRECTIONAL);
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if (dma_mapping_error(jrdev, dma_addr)) {
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dev_err(jrdev, "unable to map key memory\n");
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goto out_free;
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}
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init_job_desc(desc, 0);
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append_key(desc, dma_addr, keylen, CLASS_2 | KEY_DEST_CLASS_REG);
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/* Sets MDHA up into an HMAC-INIT */
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append_operation(desc, (adata->algtype & OP_ALG_ALGSEL_MASK) |
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OP_ALG_AAI_HMAC | OP_TYPE_CLASS2_ALG | OP_ALG_DECRYPT |
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OP_ALG_AS_INIT);
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/*
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* do a FIFO_LOAD of zero, this will trigger the internal key expansion
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* into both pads inside MDHA
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*/
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append_fifo_load_as_imm(desc, NULL, 0, LDST_CLASS_2_CCB |
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FIFOLD_TYPE_MSG | FIFOLD_TYPE_LAST2);
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/*
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* FIFO_STORE with the explicit split-key content store
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* (0x26 output type)
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*/
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append_fifo_store(desc, dma_addr, adata->keylen,
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LDST_CLASS_2_CCB | FIFOST_TYPE_SPLIT_KEK);
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print_hex_dump_debug("jobdesc@"__stringify(__LINE__)": ",
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DUMP_PREFIX_ADDRESS, 16, 4, desc, desc_bytes(desc),
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1);
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result.err = 0;
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init_completion(&result.completion);
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ret = caam_jr_enqueue(jrdev, desc, split_key_done, &result);
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if (ret == -EINPROGRESS) {
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/* in progress */
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wait_for_completion(&result.completion);
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ret = result.err;
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print_hex_dump_debug("ctx.key@"__stringify(__LINE__)": ",
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DUMP_PREFIX_ADDRESS, 16, 4, key_out,
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adata->keylen_pad, 1);
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}
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dma_unmap_single(jrdev, dma_addr, local_max, DMA_BIDIRECTIONAL);
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out_free:
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kfree(desc);
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return ret;
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}
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EXPORT_SYMBOL(gen_split_key);
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