307244452d
When generating a split key or hashing the key, DMA mapping the key
buffers coming directly from user is incorrect, since they are
not guaranteed to be DMAable.
Update driver to first copy user-provided key in the output buffer
("key_out") and then use this buffer for in-place computation
(split key generation, respectively key hashing).
Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
131 lines
3.4 KiB
C
131 lines
3.4 KiB
C
// 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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#ifdef DEBUG
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dev_err(dev, "%s %d: err 0x%x\n", __func__, __LINE__, err);
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#endif
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if (err)
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caam_jr_strstatus(dev, err);
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res->err = err;
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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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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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#ifdef DEBUG
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dev_err(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(KERN_ERR, "ctx.key@" __stringify(__LINE__)": ",
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DUMP_PREFIX_ADDRESS, 16, 4, key_in, keylen, 1);
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#endif
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if (adata->keylen_pad > 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, adata->keylen_pad,
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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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#ifdef DEBUG
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print_hex_dump(KERN_ERR, "jobdesc@"__stringify(__LINE__)": ",
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DUMP_PREFIX_ADDRESS, 16, 4, desc, desc_bytes(desc), 1);
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#endif
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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) {
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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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#ifdef DEBUG
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print_hex_dump(KERN_ERR, "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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#endif
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}
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dma_unmap_single(jrdev, dma_addr, adata->keylen_pad, 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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