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crypto: crc32c - Provide crc32c-arch driver for accelerated library code

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crc32c-generic is currently backed by the architecture's CRC-32c library
code, which may offer a variety of implementations depending on the
capabilities of the platform. These are not covered by the crypto
subsystem's fuzz testing capabilities because crc32c-generic is the
reference driver that the fuzzing logic uses as a source of truth.

Fix this by providing a crc32c-arch implementation which is based on the
arch library code if available, and modify crc32c-generic so it is
always based on the generic C implementation. If the arch has no CRC-32c
library code, this change does nothing.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Ard Biesheuvel 2024-10-16 20:57:25 +02:00 committed by Herbert Xu
parent a37e55791f
commit 16739efac6
3 changed files with 75 additions and 22 deletions
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1
crypto/Makefile
View File

@ -155,6 +155,7 @@ obj-$(CONFIG_CRYPTO_DEFLATE) += deflate.o
obj-$(CONFIG_CRYPTO_MICHAEL_MIC) += michael_mic.o
obj-$(CONFIG_CRYPTO_CRC32C) += crc32c_generic.o
obj-$(CONFIG_CRYPTO_CRC32) += crc32_generic.o
CFLAGS_crc32c_generic.o += -DARCH=$(ARCH)
CFLAGS_crc32_generic.o += -DARCH=$(ARCH)
obj-$(CONFIG_CRYPTO_CRCT10DIF) += crct10dif_common.o crct10dif_generic.o
obj-$(CONFIG_CRYPTO_CRC64_ROCKSOFT) += crc64_rocksoft_generic.o

94
crypto/crc32c_generic.c
View File

@ -85,6 +85,15 @@ static int chksum_update(struct shash_desc *desc, const u8 *data,
{
struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
ctx->crc = __crc32c_le_base(ctx->crc, data, length);
return 0;
}
static int chksum_update_arch(struct shash_desc *desc, const u8 *data,
unsigned int length)
{
struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
ctx->crc = __crc32c_le(ctx->crc, data, length);
return 0;
}
@ -98,6 +107,13 @@ static int chksum_final(struct shash_desc *desc, u8 *out)
}
static int __chksum_finup(u32 *crcp, const u8 *data, unsigned int len, u8 *out)
{
put_unaligned_le32(~__crc32c_le_base(*crcp, data, len), out);
return 0;
}
static int __chksum_finup_arch(u32 *crcp, const u8 *data, unsigned int len,
u8 *out)
{
put_unaligned_le32(~__crc32c_le(*crcp, data, len), out);
return 0;
@ -111,6 +127,14 @@ static int chksum_finup(struct shash_desc *desc, const u8 *data,
return __chksum_finup(&ctx->crc, data, len, out);
}
static int chksum_finup_arch(struct shash_desc *desc, const u8 *data,
unsigned int len, u8 *out)
{
struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
return __chksum_finup_arch(&ctx->crc, data, len, out);
}
static int chksum_digest(struct shash_desc *desc, const u8 *data,
unsigned int length, u8 *out)
{
@ -119,6 +143,14 @@ static int chksum_digest(struct shash_desc *desc, const u8 *data,
return __chksum_finup(&mctx->key, data, length, out);
}
static int chksum_digest_arch(struct shash_desc *desc, const u8 *data,
unsigned int length, u8 *out)
{
struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
return __chksum_finup_arch(&mctx->key, data, length, out);
}
static int crc32c_cra_init(struct crypto_tfm *tfm)
{
struct chksum_ctx *mctx = crypto_tfm_ctx(tfm);
@ -127,35 +159,53 @@ static int crc32c_cra_init(struct crypto_tfm *tfm)
return 0;
}
static struct shash_alg alg = {
.digestsize = CHKSUM_DIGEST_SIZE,
.setkey = chksum_setkey,
.init = chksum_init,
.update = chksum_update,
.final = chksum_final,
.finup = chksum_finup,
.digest = chksum_digest,
.descsize = sizeof(struct chksum_desc_ctx),
.base = {
.cra_name = "crc32c",
.cra_driver_name = "crc32c-generic",
.cra_priority = 100,
.cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
.cra_blocksize = CHKSUM_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct chksum_ctx),
.cra_module = THIS_MODULE,
.cra_init = crc32c_cra_init,
}
};
static struct shash_alg algs[] = {{
.digestsize = CHKSUM_DIGEST_SIZE,
.setkey = chksum_setkey,
.init = chksum_init,
.update = chksum_update,
.final = chksum_final,
.finup = chksum_finup,
.digest = chksum_digest,
.descsize = sizeof(struct chksum_desc_ctx),
.base.cra_name = "crc32c",
.base.cra_driver_name = "crc32c-generic",
.base.cra_priority = 100,
.base.cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
.base.cra_blocksize = CHKSUM_BLOCK_SIZE,
.base.cra_ctxsize = sizeof(struct chksum_ctx),
.base.cra_module = THIS_MODULE,
.base.cra_init = crc32c_cra_init,
}, {
.digestsize = CHKSUM_DIGEST_SIZE,
.setkey = chksum_setkey,
.init = chksum_init,
.update = chksum_update_arch,
.final = chksum_final,
.finup = chksum_finup_arch,
.digest = chksum_digest_arch,
.descsize = sizeof(struct chksum_desc_ctx),
.base.cra_name = "crc32c",
.base.cra_driver_name = "crc32c-" __stringify(ARCH),
.base.cra_priority = 150,
.base.cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
.base.cra_blocksize = CHKSUM_BLOCK_SIZE,
.base.cra_ctxsize = sizeof(struct chksum_ctx),
.base.cra_module = THIS_MODULE,
.base.cra_init = crc32c_cra_init,
}};
static int __init crc32c_mod_init(void)
{
return crypto_register_shash(&alg);
/* register the arch flavor only if it differs from the generic one */
return crypto_register_shashes(algs, 1 + (&__crc32c_le != &__crc32c_le_base));
}
static void __exit crc32c_mod_fini(void)
{
crypto_unregister_shash(&alg);
crypto_unregister_shashes(algs, 1 + (&__crc32c_le != &__crc32c_le_base));
}
subsys_initcall(crc32c_mod_init);

2
lib/crc32.c
View File

@ -208,6 +208,8 @@ u32 __pure crc32_le_base(u32, unsigned char const *, size_t) __alias(crc32_le);
EXPORT_SYMBOL(crc32_le_base);
u32 __pure __crc32c_le_base(u32, unsigned char const *, size_t) __alias(__crc32c_le);
EXPORT_SYMBOL(__crc32c_le_base);
u32 __pure crc32_be_base(u32, unsigned char const *, size_t) __alias(crc32_be);
/*