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Subject[PATCH] crypto/crc32c implementation, updated 040419
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This patch agains 2.6.6-rc1-bk implements the CRC32C algorithm as a
type of digest. It is implemented as a wrapper for libcrc32c,
available in a separate patch. The crypto CRC32C module will be
used by the iscsi-sfnet driver.

--
Clay Haapala (chaapala@cisco.com) Cisco Systems SRBU +1 763-398-1056
6450 Wedgwood Rd, Suite 130 Maple Grove MN 55311 PGP: C89240AD
If, for the sake of keeping Americans from dying, the
liberties for which Americans have fought and died are infringed,
who has won?

diff -ruN --exclude='*.orig' --exclude=SCCS --exclude=BitKeeper linux-2.6.6-rc1-bk.orig/crypto/crc32c.c linux-2.6.6-rc1/crypto/crc32c.c
--- linux-2.6.6-rc1-bk.orig/crypto/crc32c.c 1969-12-31 18:00:00.000000000 -0600
+++ linux-2.6.6-rc1/crypto/crc32c.c 2004-04-19 16:17:57.000000000 -0500
@@ -0,0 +1,110 @@
+/*
+ * Cryptographic API.
+ *
+ * CRC32C chksum
+ *
+ * This module file is a wrapper to invoke the lib/crc32c routines.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ */
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/crypto.h>
+#include <linux/crc32c.h>
+#include <asm/byteorder.h>
+
+#define CHKSUM_BLOCK_SIZE 32
+#define CHKSUM_DIGEST_SIZE 4
+
+struct chksum_ctx {
+ u32 crc;
+};
+
+/*
+ * Steps through buffer one byte at at time, calculates reflected
+ * crc using table.
+ */
+
+static void chksum_init(void *ctx)
+{
+ struct chksum_ctx *mctx = ctx;
+
+ mctx->crc = ~(u32)0; /* common usage */
+}
+
+/*
+ * Setting the seed allows arbitrary accumulators and flexible XOR policy
+ * If your algorithm starts with ~0, then XOR with ~0 before you set
+ * the seed.
+ */
+static int chksum_setkey(void *ctx, const u8 *key, unsigned int keylen,
+ u32 *flags)
+{
+ struct chksum_ctx *mctx = ctx;
+
+ if (keylen != sizeof(mctx->crc)) {
+ if (flags)
+ *flags = CRYPTO_TFM_RES_BAD_KEY_LEN;
+ return -EINVAL;
+ }
+ mctx->crc = __cpu_to_le32(*(u32 *)key);
+ return 0;
+}
+
+static void chksum_update(void *ctx, const u8 *data, size_t length)
+{
+ struct chksum_ctx *mctx = ctx;
+ u32 mcrc;
+
+ mcrc = crc32c(mctx->crc, data, length);
+
+ mctx->crc = mcrc;
+}
+
+static void chksum_final(void *ctx, u8 *out)
+{
+ struct chksum_ctx *mctx = ctx;
+ u32 mcrc = (mctx->crc ^ ~(u32)0);
+
+ *(u32 *)out = __le32_to_cpu(mcrc);
+}
+
+static struct crypto_alg alg = {
+ .cra_name = "crc32c",
+ .cra_flags = CRYPTO_ALG_TYPE_DIGEST,
+ .cra_blocksize = CHKSUM_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct chksum_ctx),
+ .cra_module = THIS_MODULE,
+ .cra_list = LIST_HEAD_INIT(alg.cra_list),
+ .cra_u = {
+ .digest = {
+ .dia_digestsize= CHKSUM_DIGEST_SIZE,
+ .dia_setkey = chksum_setkey,
+ .dia_init = chksum_init,
+ .dia_update = chksum_update,
+ .dia_final = chksum_final
+ }
+ }
+};
+
+static int __init init(void)
+{
+ return crypto_register_alg(&alg);
+}
+
+static void __exit fini(void)
+{
+ crypto_unregister_alg(&alg);
+}
+
+module_init(init);
+module_exit(fini);
+
+MODULE_AUTHOR("Clay Haapala <chaapala@cisco.com>");
+MODULE_DESCRIPTION("CRC32c (Castagnoli) calculations wrapper for lib/crc32c");
+MODULE_LICENSE("GPL");
diff -ruN --exclude='*.orig' --exclude=SCCS --exclude=BitKeeper linux-2.6.6-rc1-bk.orig/crypto/Kconfig linux-2.6.6-rc1/crypto/Kconfig
--- linux-2.6.6-rc1-bk.orig/crypto/Kconfig 2004-04-19 15:04:01.000000000 -0500
+++ linux-2.6.6-rc1/crypto/Kconfig 2004-04-19 16:17:57.000000000 -0500
@@ -171,6 +171,16 @@
should not be used for other purposes because of the weakness
of the algorithm.

+config CRYPTO_CRC32C
+ tristate "CRC32c CRC algorithm"
+ depends on CRYPTO
+ select LIBCRC32C
+ help
+ Castagnoli, et al Cyclic Redundancy-Check Algorithm. Used
+ by iSCSI for header and data digests and by others.
+ See Castagnoli93. This implementation uses lib/libcrc32c.
+ Module will be crc32c.
+
config CRYPTO_TEST
tristate "Testing module"
depends on CRYPTO
diff -ruN --exclude='*.orig' --exclude=SCCS --exclude=BitKeeper linux-2.6.6-rc1-bk.orig/crypto/Makefile linux-2.6.6-rc1/crypto/Makefile
--- linux-2.6.6-rc1-bk.orig/crypto/Makefile 2004-03-29 15:29:29.000000000 -0600
+++ linux-2.6.6-rc1/crypto/Makefile 2004-04-19 16:17:57.000000000 -0500
@@ -24,5 +24,6 @@
obj-$(CONFIG_CRYPTO_ARC4) += arc4.o
obj-$(CONFIG_CRYPTO_DEFLATE) += deflate.o
obj-$(CONFIG_CRYPTO_MICHAEL_MIC) += michael_mic.o
+obj-$(CONFIG_CRYPTO_CRC32C) += crc32c.o

obj-$(CONFIG_CRYPTO_TEST) += tcrypt.o
diff -ruN --exclude='*.orig' --exclude=SCCS --exclude=BitKeeper linux-2.6.6-rc1-bk.orig/crypto/tcrypt.c linux-2.6.6-rc1/crypto/tcrypt.c
--- linux-2.6.6-rc1-bk.orig/crypto/tcrypt.c 2004-03-29 15:29:30.000000000 -0600
+++ linux-2.6.6-rc1/crypto/tcrypt.c 2004-04-19 16:17:57.000000000 -0500
@@ -61,7 +61,7 @@
static char *check[] = {
"des", "md5", "des3_ede", "rot13", "sha1", "sha256", "blowfish",
"twofish", "serpent", "sha384", "sha512", "md4", "aes", "cast6",
- "arc4", "michael_mic", "deflate", NULL
+ "arc4", "michael_mic", "deflate", "crc32c", NULL
};

static void
@@ -496,6 +496,107 @@
}

static void
+test_crc32c(void)
+{
+#define NUMVEC 6
+#define VECSIZE 40
+
+ int i, j, pass;
+ u32 crc;
+ u8 b, test_vec[NUMVEC][VECSIZE];
+ static u32 vec_results[NUMVEC] = {
+ 0x0e2c157f, 0xe980ebf6, 0xde74bded,
+ 0xd579c862, 0xba979ad0, 0x2b29d913
+ };
+ static u32 tot_vec_results = 0x24c5d375;
+
+ struct scatterlist sg[NUMVEC];
+ struct crypto_tfm *tfm;
+ char *fmtdata = "testing crc32c initialized to %08x: %s\n";
+#define SEEDTESTVAL 0xedcba987
+ u32 seed;
+
+ printk("\ntesting crc32c\n");
+
+ tfm = crypto_alloc_tfm("crc32c", 0);
+ if (tfm == NULL) {
+ printk("failed to load transform for crc32c\n");
+ return;
+ }
+
+ crypto_digest_init(tfm);
+ crypto_digest_final(tfm, (u8*)&crc);
+ printk(fmtdata, crc, (crc == 0) ? "pass" : "ERROR");
+
+ /*
+ * stuff test_vec with known values, simple incrementing
+ * byte values.
+ */
+ b = 0;
+ for (i = 0; i < NUMVEC; i++) {
+ for (j = 0; j < VECSIZE; j++)
+ test_vec[i][j] = ++b;
+ sg[i].page = virt_to_page(test_vec[i]);
+ sg[i].offset = offset_in_page(test_vec[i]);
+ sg[i].length = VECSIZE;
+ }
+
+ seed = SEEDTESTVAL;
+ (void)crypto_digest_setkey(tfm, (const u8*)&seed, sizeof(u32));
+ crypto_digest_final(tfm, (u8*)&crc);
+ printk("testing crc32c setkey returns %08x : %s\n", crc, (crc == (SEEDTESTVAL ^ ~(u32)0)) ?
+ "pass" : "ERROR");
+
+ printk("testing crc32c using update/final:\n");
+
+ pass = 1; /* assume all is well */
+
+ for (i = 0; i < NUMVEC; i++) {
+ seed = ~(u32)0;
+ (void)crypto_digest_setkey(tfm, (const u8*)&seed, sizeof(u32));
+ crypto_digest_update(tfm, &sg[i], 1);
+ crypto_digest_final(tfm, (u8*)&crc);
+ if (crc == vec_results[i]) {
+ printk(" %08x:OK", crc);
+ } else {
+ printk(" %08x:BAD, wanted %08x\n", crc, vec_results[i]);
+ pass = 0;
+ }
+ }
+
+ printk("\ntesting crc32c using incremental accumulator:\n");
+ crc = 0;
+ for (i = 0; i < NUMVEC; i++) {
+ seed = (crc ^ ~(u32)0);
+ (void)crypto_digest_setkey(tfm, (const u8*)&seed, sizeof(u32));
+ crypto_digest_update(tfm, &sg[i], 1);
+ crypto_digest_final(tfm, (u8*)&crc);
+ }
+ if (crc == tot_vec_results) {
+ printk(" %08x:OK", crc);
+ } else {
+ printk(" %08x:BAD, wanted %08x\n", crc, tot_vec_results);
+ pass = 0;
+ }
+
+ printk("\ntesting crc32c using digest:\n");
+ seed = ~(u32)0;
+ (void)crypto_digest_setkey(tfm, (const u8*)&seed, sizeof(u32));
+ crypto_digest_digest(tfm, sg, NUMVEC, (u8*)&crc);
+ if (crc == tot_vec_results) {
+ printk(" %08x:OK", crc);
+ } else {
+ printk(" %08x:BAD, wanted %08x\n", crc, tot_vec_results);
+ pass = 0;
+ }
+
+ printk("\n%s\n", pass ? "pass" : "ERROR");
+
+ crypto_free_tfm(tfm);
+ printk("crc32c test complete\n");
+}
+
+static void
test_available(void)
{
char **name = check;
@@ -566,7 +667,8 @@

test_hash("sha384", sha384_tv_template, SHA384_TEST_VECTORS);
test_hash("sha512", sha512_tv_template, SHA512_TEST_VECTORS);
- test_deflate();
+ test_deflate();
+ test_crc32c();
#ifdef CONFIG_CRYPTO_HMAC
test_hmac("md5", hmac_md5_tv_template, HMAC_MD5_TEST_VECTORS);
test_hmac("sha1", hmac_sha1_tv_template, HMAC_SHA1_TEST_VECTORS);
@@ -657,6 +759,10 @@
test_hash("michael_mic", michael_mic_tv_template, MICHAEL_MIC_TEST_VECTORS);
break;

+ case 18:
+ test_crc32c();
+ break;
+
#ifdef CONFIG_CRYPTO_HMAC
case 100:
test_hmac("md5", hmac_md5_tv_template, HMAC_MD5_TEST_VECTORS);
-
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