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/*
* 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;
#ifdef DEBUG
dev_err(dev, "%s %d: err 0x%x\n", __func__, __LINE__, err);
#endif
if (err) {
char tmp[CAAM_ERROR_STR_MAX];
dev_err(dev, "%08x: %s\n", err, caam_jr_strstatus(tmp, 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, int split_key_len,
int split_key_pad_len, const u8 *key_in, u32 keylen,
u32 alg_op)
{
u32 *desc;
struct split_key_result result;
dma_addr_t dma_addr_in, dma_addr_out;
int ret = 0;
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 -ENOMEM;
}
init_job_desc(desc, 0);
dma_addr_in = dma_map_single(jrdev, (void *)key_in, keylen,
DMA_TO_DEVICE);
if (dma_mapping_error(jrdev, dma_addr_in)) {
dev_err(jrdev, "unable to map key input memory\n");
kfree(desc);
return -ENOMEM;
}
append_key(desc, dma_addr_in, keylen, CLASS_2 | KEY_DEST_CLASS_REG);
/* Sets MDHA up into an HMAC-INIT */
append_operation(desc, alg_op | 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)
*/
dma_addr_out = dma_map_single(jrdev, key_out, split_key_pad_len,
DMA_FROM_DEVICE);
if (dma_mapping_error(jrdev, dma_addr_out)) {
dev_err(jrdev, "unable to map key output memory\n");
kfree(desc);
return -ENOMEM;
}
append_fifo_store(desc, dma_addr_out, split_key_len,
LDST_CLASS_2_CCB | FIFOST_TYPE_SPLIT_KEK);
#ifdef DEBUG
print_hex_dump(KERN_ERR, "ctx.key@"xstr(__LINE__)": ",
DUMP_PREFIX_ADDRESS, 16, 4, key_in, keylen, 1);
print_hex_dump(KERN_ERR, "jobdesc@"xstr(__LINE__)": ",
DUMP_PREFIX_ADDRESS, 16, 4, desc, desc_bytes(desc), 1);
#endif
result.err = 0;
init_completion(&result.completion);
ret = caam_jr_enqueue(jrdev, desc, split_key_done, &result);
if (!ret) {
/* in progress */
wait_for_completion_interruptible(&result.completion);
ret = result.err;
#ifdef DEBUG
print_hex_dump(KERN_ERR, "ctx.key@"xstr(__LINE__)": ",
DUMP_PREFIX_ADDRESS, 16, 4, key_out,
split_key_pad_len, 1);
#endif
}
dma_unmap_single(jrdev, dma_addr_out, split_key_pad_len,
DMA_FROM_DEVICE);
dma_unmap_single(jrdev, dma_addr_in, keylen, DMA_TO_DEVICE);
kfree(desc);
return ret;
}
EXPORT_SYMBOL(gen_split_key);
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