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// SPDX-License-Identifier: GPL-2.0
/*
* CAAM/SEC 4.x functions for handling key-generation jobs
*
* Copyright 2008-2011 Freescale Semiconductor, Inc.
*
*/
#include "compat.h"
#include "jr.h"
#include "error.h"
#include "desc_constr.h"
#include "key_gen.h"
void split_key_done(struct device *dev, u32 *desc, u32 err,
void *context)
{
struct split_key_result *res = context;
dev_dbg(dev, "%s %d: err 0x%x\n", __func__, __LINE__, err);
if (err)
caam_jr_strstatus(dev, err);
res->err = err;
complete(&res->completion);
}
EXPORT_SYMBOL(split_key_done);
/*
get a split ipad/opad key
Split key generation-----------------------------------------------
[00] 0xb0810008 jobdesc: stidx=1 share=never len=8
[01] 0x04000014 key: class2->keyreg len=20
@0xffe01000
[03] 0x84410014 operation: cls2-op sha1 hmac init dec
[04] 0x24940000 fifold: class2 msgdata-last2 len=0 imm
[05] 0xa4000001 jump: class2 local all ->1 [06]
[06] 0x64260028 fifostr: class2 mdsplit-jdk len=40
@0xffe04000
*/
int gen_split_key(struct device *jrdev, u8 *key_out,
struct alginfo * const adata, const u8 *key_in, u32 keylen,
int max_keylen)
{
u32 *desc;
struct split_key_result result;
dma_addr_t dma_addr;
int ret = -ENOMEM;
adata->keylen = split_key_len(adata->algtype & OP_ALG_ALGSEL_MASK);
adata->keylen_pad = split_key_pad_len(adata->algtype &
OP_ALG_ALGSEL_MASK);
dev_dbg(jrdev, "split keylen %d split keylen padded %d\n",
adata->keylen, adata->keylen_pad);
print_hex_dump_debug("ctx.key@" __stringify(__LINE__)": ",
DUMP_PREFIX_ADDRESS, 16, 4, key_in, keylen, 1);
if (adata->keylen_pad > max_keylen)
return -EINVAL;
desc = kmalloc(CAAM_CMD_SZ * 6 + CAAM_PTR_SZ * 2, GFP_KERNEL | GFP_DMA);
if (!desc) {
dev_err(jrdev, "unable to allocate key input memory\n");
return ret;
}
memcpy(key_out, key_in, keylen);
dma_addr = dma_map_single(jrdev, key_out, adata->keylen_pad,
DMA_BIDIRECTIONAL);
if (dma_mapping_error(jrdev, dma_addr)) {
dev_err(jrdev, "unable to map key memory\n");
goto out_free;
}
init_job_desc(desc, 0);
append_key(desc, dma_addr, keylen, CLASS_2 | KEY_DEST_CLASS_REG);
/* Sets MDHA up into an HMAC-INIT */
append_operation(desc, (adata->algtype & OP_ALG_ALGSEL_MASK) |
OP_ALG_AAI_HMAC | OP_TYPE_CLASS2_ALG | OP_ALG_DECRYPT |
OP_ALG_AS_INIT);
/*
* do a FIFO_LOAD of zero, this will trigger the internal key expansion
* into both pads inside MDHA
*/
append_fifo_load_as_imm(desc, NULL, 0, LDST_CLASS_2_CCB |
FIFOLD_TYPE_MSG | FIFOLD_TYPE_LAST2);
/*
* FIFO_STORE with the explicit split-key content store
* (0x26 output type)
*/
append_fifo_store(desc, dma_addr, adata->keylen,
LDST_CLASS_2_CCB | FIFOST_TYPE_SPLIT_KEK);
print_hex_dump_debug("jobdesc@"__stringify(__LINE__)": ",
DUMP_PREFIX_ADDRESS, 16, 4, desc, desc_bytes(desc),
1);
result.err = 0;
init_completion(&result.completion);
ret = caam_jr_enqueue(jrdev, desc, split_key_done, &result);
if (!ret) {
/* in progress */
wait_for_completion(&result.completion);
ret = result.err;
print_hex_dump_debug("ctx.key@"__stringify(__LINE__)": ",
DUMP_PREFIX_ADDRESS, 16, 4, key_out,
adata->keylen_pad, 1);
}
dma_unmap_single(jrdev, dma_addr, adata->keylen_pad, DMA_BIDIRECTIONAL);
out_free:
kfree(desc);
return ret;
}
EXPORT_SYMBOL(gen_split_key);
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