crypto: crc32 - Provide crc32-arch driver for accelerated library code

crc32-generic is currently backed by the architecture's CRC-32 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 crc32-generic is the
reference driver that the fuzzing logic uses as a source of truth.

Fix this by providing a crc32-arch implementation which is based on the
arch library code if available, and modify crc32-generic so it is
always based on the generic C implementation. If the arch has no CRC-32
library code, this change does nothing.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

2 files changed, 71 insertions, 24 deletions

diff --git a/crypto/Makefile b/crypto/Makefile
index 81be78d39c2d..3e49a820f148 100644
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -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_crc32_generic.o += -DARCH=$(ARCH)
 obj-$(CONFIG_CRYPTO_CRCT10DIF) += crct10dif_common.o crct10dif_generic.o
 obj-$(CONFIG_CRYPTO_CRC64_ROCKSOFT) += crc64_rocksoft_generic.o
 obj-$(CONFIG_CRYPTO_AUTHENC) += authenc.o authencesn.o
diff --git a/crypto/crc32_generic.c b/crypto/crc32_generic.c
index a989cb44fd16..8d6e1baec509 100644
--- a/crypto/crc32_generic.c
+++ b/crypto/crc32_generic.c
@@ -59,6 +59,15 @@ static int crc32_update(struct shash_desc *desc, const u8 *data,
 {
 	u32 *crcp = shash_desc_ctx(desc);
 
+	*crcp = crc32_le_base(*crcp, data, len);
+	return 0;
+}
+
+static int crc32_update_arch(struct shash_desc *desc, const u8 *data,
+			     unsigned int len)
+{
+	u32 *crcp = shash_desc_ctx(desc);
+
 	*crcp = crc32_le(*crcp, data, len);
 	return 0;
 }
@@ -67,6 +76,13 @@ static int crc32_update(struct shash_desc *desc, const u8 *data,
 static int __crc32_finup(u32 *crcp, const u8 *data, unsigned int len,
 			 u8 *out)
 {
+	put_unaligned_le32(crc32_le_base(*crcp, data, len), out);
+	return 0;
+}
+
+static int __crc32_finup_arch(u32 *crcp, const u8 *data, unsigned int len,
+			      u8 *out)
+{
 	put_unaligned_le32(crc32_le(*crcp, data, len), out);
 	return 0;
 }
@@ -77,6 +93,12 @@ static int crc32_finup(struct shash_desc *desc, const u8 *data,
 	return __crc32_finup(shash_desc_ctx(desc), data, len, out);
 }
 
+static int crc32_finup_arch(struct shash_desc *desc, const u8 *data,
+		       unsigned int len, u8 *out)
+{
+	return __crc32_finup_arch(shash_desc_ctx(desc), data, len, out);
+}
+
 static int crc32_final(struct shash_desc *desc, u8 *out)
 {
 	u32 *crcp = shash_desc_ctx(desc);
@@ -88,38 +110,62 @@ static int crc32_final(struct shash_desc *desc, u8 *out)
 static int crc32_digest(struct shash_desc *desc, const u8 *data,
 			unsigned int len, u8 *out)
 {
-	return __crc32_finup(crypto_shash_ctx(desc->tfm), data, len,
-			     out);
+	return __crc32_finup(crypto_shash_ctx(desc->tfm), data, len, out);
 }
-static struct shash_alg alg = {
-	.setkey		= crc32_setkey,
-	.init		= crc32_init,
-	.update		= crc32_update,
-	.final		= crc32_final,
-	.finup		= crc32_finup,
-	.digest		= crc32_digest,
-	.descsize	= sizeof(u32),
-	.digestsize	= CHKSUM_DIGEST_SIZE,
-	.base		= {
-		.cra_name		= "crc32",
-		.cra_driver_name	= "crc32-generic",
-		.cra_priority		= 100,
-		.cra_flags		= CRYPTO_ALG_OPTIONAL_KEY,
-		.cra_blocksize		= CHKSUM_BLOCK_SIZE,
-		.cra_ctxsize		= sizeof(u32),
-		.cra_module		= THIS_MODULE,
-		.cra_init		= crc32_cra_init,
-	}
-};
+
+static int crc32_digest_arch(struct shash_desc *desc, const u8 *data,
+			     unsigned int len, u8 *out)
+{
+	return __crc32_finup_arch(crypto_shash_ctx(desc->tfm), data, len, out);
+}
+
+static struct shash_alg algs[] = {{
+	.setkey			= crc32_setkey,
+	.init			= crc32_init,
+	.update			= crc32_update,
+	.final			= crc32_final,
+	.finup			= crc32_finup,
+	.digest			= crc32_digest,
+	.descsize		= sizeof(u32),
+	.digestsize		= CHKSUM_DIGEST_SIZE,
+
+	.base.cra_name		= "crc32",
+	.base.cra_driver_name	= "crc32-generic",
+	.base.cra_priority	= 100,
+	.base.cra_flags		= CRYPTO_ALG_OPTIONAL_KEY,
+	.base.cra_blocksize	= CHKSUM_BLOCK_SIZE,
+	.base.cra_ctxsize	= sizeof(u32),
+	.base.cra_module	= THIS_MODULE,
+	.base.cra_init		= crc32_cra_init,
+}, {
+	.setkey			= crc32_setkey,
+	.init			= crc32_init,
+	.update			= crc32_update_arch,
+	.final			= crc32_final,
+	.finup			= crc32_finup_arch,
+	.digest			= crc32_digest_arch,
+	.descsize		= sizeof(u32),
+	.digestsize		= CHKSUM_DIGEST_SIZE,
+
+	.base.cra_name		= "crc32",
+	.base.cra_driver_name	= "crc32-" __stringify(ARCH),
+	.base.cra_priority	= 150,
+	.base.cra_flags		= CRYPTO_ALG_OPTIONAL_KEY,
+	.base.cra_blocksize	= CHKSUM_BLOCK_SIZE,
+	.base.cra_ctxsize	= sizeof(u32),
+	.base.cra_module	= THIS_MODULE,
+	.base.cra_init		= crc32_cra_init,
+}};
 
 static int __init crc32_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 + (&crc32_le != &crc32_le_base));
 }
 
 static void __exit crc32_mod_fini(void)
 {
-	crypto_unregister_shash(&alg);
+	crypto_unregister_shashes(algs, 1 + (&crc32_le != &crc32_le_base));
 }
 
 subsys_initcall(crc32_mod_init);