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/*
* Copyright 2014 Freescale Semiconductor, Inc.
*
* SPDX-License-Identifier: GPL-2.0+
*
*/
#include <common.h>
#include <malloc.h>
#include "jobdesc.h"
#include "desc.h"
#include "jr.h"
#include "fsl_hash.h"
#include <hw_sha.h>
#include <asm-generic/errno.h>
#define CRYPTO_MAX_ALG_NAME 80
#define SHA1_DIGEST_SIZE 20
#define SHA256_DIGEST_SIZE 32
struct caam_hash_template {
char name[CRYPTO_MAX_ALG_NAME];
unsigned int digestsize;
u32 alg_type;
};
enum caam_hash_algos {
SHA1 = 0,
SHA256
};
static struct caam_hash_template driver_hash[] = {
{
.name = "sha1",
.digestsize = SHA1_DIGEST_SIZE,
.alg_type = OP_ALG_ALGSEL_SHA1,
},
{
.name = "sha256",
.digestsize = SHA256_DIGEST_SIZE,
.alg_type = OP_ALG_ALGSEL_SHA256,
},
};
static enum caam_hash_algos get_hash_type(struct hash_algo *algo)
{
if (!strcmp(algo->name, driver_hash[SHA1].name))
return SHA1;
else
return SHA256;
}
/* Create the context for progressive hashing using h/w acceleration.
*
* @ctxp: Pointer to the pointer of the context for hashing
* @caam_algo: Enum for SHA1 or SHA256
* @return 0 if ok, -ENOMEM on error
*/
static int caam_hash_init(void **ctxp, enum caam_hash_algos caam_algo)
{
*ctxp = calloc(1, sizeof(struct sha_ctx));
if (*ctxp == NULL) {
debug("Cannot allocate memory for context\n");
return -ENOMEM;
}
return 0;
}
/*
* Update sg table for progressive hashing using h/w acceleration
*
* The context is freed by this function if an error occurs.
* We support at most 32 Scatter/Gather Entries.
*
* @hash_ctx: Pointer to the context for hashing
* @buf: Pointer to the buffer being hashed
* @size: Size of the buffer being hashed
* @is_last: 1 if this is the last update; 0 otherwise
* @caam_algo: Enum for SHA1 or SHA256
* @return 0 if ok, -EINVAL on error
*/
static int caam_hash_update(void *hash_ctx, const void *buf,
unsigned int size, int is_last,
enum caam_hash_algos caam_algo)
{
uint32_t final = 0;
dma_addr_t addr = virt_to_phys((void *)buf);
struct sha_ctx *ctx = hash_ctx;
if (ctx->sg_num >= MAX_SG_32) {
free(ctx);
return -EINVAL;
}
#ifdef CONFIG_PHYS_64BIT
ctx->sg_tbl[ctx->sg_num].addr_hi = addr >> 32;
#else
ctx->sg_tbl[ctx->sg_num].addr_hi = 0x0;
#endif
ctx->sg_tbl[ctx->sg_num].addr_lo = addr;
sec_out32(&ctx->sg_tbl[ctx->sg_num].len_flag,
(size & SG_ENTRY_LENGTH_MASK));
ctx->sg_num++;
if (is_last) {
final = sec_in32(&ctx->sg_tbl[ctx->sg_num - 1].len_flag) |
SG_ENTRY_FINAL_BIT;
sec_out32(&ctx->sg_tbl[ctx->sg_num - 1].len_flag, final);
}
return 0;
}
/*
* Perform progressive hashing on the given buffer and copy hash at
* destination buffer
*
* The context is freed after completion of hash operation.
*
* @hash_ctx: Pointer to the context for hashing
* @dest_buf: Pointer to the destination buffer where hash is to be copied
* @size: Size of the buffer being hashed
* @caam_algo: Enum for SHA1 or SHA256
* @return 0 if ok, -EINVAL on error
*/
static int caam_hash_finish(void *hash_ctx, void *dest_buf,
int size, enum caam_hash_algos caam_algo)
{
uint32_t len = 0;
struct sha_ctx *ctx = hash_ctx;
int i = 0, ret = 0;
if (size < driver_hash[caam_algo].digestsize) {
free(ctx);
return -EINVAL;
}
for (i = 0; i < ctx->sg_num; i++)
len += (sec_in32(&ctx->sg_tbl[i].len_flag) &
SG_ENTRY_LENGTH_MASK);
inline_cnstr_jobdesc_hash(ctx->sha_desc, (uint8_t *)ctx->sg_tbl, len,
ctx->hash,
driver_hash[caam_algo].alg_type,
driver_hash[caam_algo].digestsize,
1);
ret = run_descriptor_jr(ctx->sha_desc);
if (ret)
debug("Error %x\n", ret);
else
memcpy(dest_buf, ctx->hash, sizeof(ctx->hash));
free(ctx);
return ret;
}
int caam_hash(const unsigned char *pbuf, unsigned int buf_len,
unsigned char *pout, enum caam_hash_algos algo)
{
int ret = 0;
uint32_t *desc;
desc = malloc(sizeof(int) * MAX_CAAM_DESCSIZE);
if (!desc) {
debug("Not enough memory for descriptor allocation\n");
return -ENOMEM;
}
inline_cnstr_jobdesc_hash(desc, pbuf, buf_len, pout,
driver_hash[algo].alg_type,
driver_hash[algo].digestsize,
0);
ret = run_descriptor_jr(desc);
free(desc);
return ret;
}
void hw_sha256(const unsigned char *pbuf, unsigned int buf_len,
unsigned char *pout, unsigned int chunk_size)
{
if (caam_hash(pbuf, buf_len, pout, SHA256))
printf("CAAM was not setup properly or it is faulty\n");
}
void hw_sha1(const unsigned char *pbuf, unsigned int buf_len,
unsigned char *pout, unsigned int chunk_size)
{
if (caam_hash(pbuf, buf_len, pout, SHA1))
printf("CAAM was not setup properly or it is faulty\n");
}
int hw_sha_init(struct hash_algo *algo, void **ctxp)
{
return caam_hash_init(ctxp, get_hash_type(algo));
}
int hw_sha_update(struct hash_algo *algo, void *ctx, const void *buf,
unsigned int size, int is_last)
{
return caam_hash_update(ctx, buf, size, is_last, get_hash_type(algo));
}
int hw_sha_finish(struct hash_algo *algo, void *ctx, void *dest_buf,
int size)
{
return caam_hash_finish(ctx, dest_buf, size, get_hash_type(algo));
}
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