diff options
| author | Philipp Tomsich <philipp.tomsich@theobroma-systems.com> | 2018-11-25 19:22:19 +0100 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2018-12-08 20:18:44 -0500 |
| commit | 51c2345bd24837f9f67f16268da6dc71573f1325 (patch) | |
| tree | 318af05398baae25f2ac5ecc8baad6a2e194b365 /common/hash.c | |
| parent | a740ee913ec8ba04cc53100440f94841648324e2 (diff) | |
Roll CRC16-CCITT into the hash infrastructure
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>
Diffstat (limited to 'common/hash.c')
| -rw-r--r-- | common/hash.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/common/hash.c b/common/hash.c index ef146513a0..413a5bfcda 100644 --- a/common/hash.c +++ b/common/hash.c @@ -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)); @@ -160,6 +187,15 @@ static struct hash_algo hash_algo[] = { }, #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, .chunk_size = CHUNKSZ_CRC32, |