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Roll CRC16-CCITT into the hash infrastructure

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The CRC16-CCITT checksum function is useful for space-constrained
applications (such as obtaining a checksum across a 2KBit or 4KBit
EEPROM) in boot applications. It has not been accessible from boot
scripts until now (due to not having a dedicated command and not being
supported by the hash infrstructure) limiting its applicability
outside of custom commands.

This adds the CRC16-CCITT (poly 0x1021, init 0x0) algorithm to the
list of available hashes and adds a new crc16_ccitt_wd_buf() to make
this possible.

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
[trini: Fix building crc16.o for SPL/TPL]
Signed-off-by: Tom Rini <trini@konsulko.com>
This commit is contained in:
Philipp Tomsich
2018-11-25 19:22:19 +01:00
committed by Tom Rini
parent a740ee913e
commit 51c2345bd2
5 changed files with 66 additions and 6 deletions
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36
common/hash.c
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@@ -85,6 +85,33 @@ static int hash_finish_sha256(struct hash_algo *algo, void *ctx, void
}
#endif
static int hash_init_crc16_ccitt(struct hash_algo *algo, void **ctxp)
{
uint16_t *ctx = malloc(sizeof(uint16_t));
*ctx = 0;
*ctxp = ctx;
return 0;
}
static int hash_update_crc16_ccitt(struct hash_algo *algo, void *ctx,
const void *buf, unsigned int size,
int is_last)
{
*((uint16_t *)ctx) = crc16_ccitt(*((uint16_t *)ctx), buf, size);
return 0;
}
static int hash_finish_crc16_ccitt(struct hash_algo *algo, void *ctx,
void *dest_buf, int size)
{
if (size < algo->digest_size)
return -1;
*((uint16_t *)dest_buf) = *((uint16_t *)ctx);
free(ctx);
return 0;
}
static int hash_init_crc32(struct hash_algo *algo, void **ctxp)
{
uint32_t *ctx = malloc(sizeof(uint32_t));
@@ -159,6 +186,15 @@ static struct hash_algo hash_algo[] = {
#endif
},
#endif
{
.name = "crc16-ccitt",
.digest_size = 2,
.chunk_size = CHUNKSZ,
.hash_func_ws = crc16_ccitt_wd_buf,
.hash_init = hash_init_crc16_ccitt,
.hash_update = hash_update_crc16_ccitt,
.hash_finish = hash_finish_crc16_ccitt,
},
{
.name = "crc32",
.digest_size = 4,