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Subject[PATCH] Add CRC32C chksums to crypto routines
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Date
This patch against 2.6.1 adds CRC32C checksumming capabilities to the
crypto routines. The structure of it is based wholly on the existing
digest (md5) routines, the main difference being that chksums are
often used in an "accumulator" fashion, effectively requiring one to
set the seed, and the digest algorithms don't do that.

CRC32C is a 32-bit CRC variant used by the iSCSI protocol and in other
drivers. iSCSI uses scatterlists, so it was strongly suggested by the
SCSI maintainers during reviews of Version 4 of the linux-iscsi driver
that the code be added to the crypto routines, which operate on
scatterlists.

Test routines have been added to tcrypt.c.

The linux-iscsi project can be found on SourceForge:
http://sourceforge.net/projects/linux-iscsi/

diff -urN --exclude '*.ko' --exclude '*.mod.*' --exclude '*~' --exclude '*.o*' --exclude '.*' --exclude '*.cmd' --exclude drivers linux-2.6.1.orig/crypto/Kconfig linux/crypto/Kconfig
--- linux-2.6.1.orig/crypto/Kconfig Fri Jan 9 01:00:03 2004
+++ linux/crypto/Kconfig Mon Jan 12 10:33:59 2004
@@ -22,6 +22,14 @@
help
These are 'Null' algorithms, used by IPsec, which do nothing.

+config CRYPTO_CRC32C
+ tristate "CRC32c CRC algorithm"
+ depends on CRYPTO
+ help
+ Castagnoli, et al Cyclic Redundancy-Check Algorithm. Used
+ by iSCSI for header and data digests and by others.
+ See Castagnoli93.
+
config CRYPTO_MD4
tristate "MD4 digest algorithm"
depends on CRYPTO
diff -urN --exclude '*.ko' --exclude '*.mod.*' --exclude '*~' --exclude '*.o*' --exclude '.*' --exclude '*.cmd' --exclude drivers linux-2.6.1.orig/crypto/Makefile linux/crypto/Makefile
--- linux-2.6.1.orig/crypto/Makefile Fri Jan 9 01:00:04 2004
+++ linux/crypto/Makefile Mon Jan 12 10:33:59 2004
@@ -4,11 +4,12 @@

proc-crypto-$(CONFIG_PROC_FS) = proc.o

-obj-$(CONFIG_CRYPTO) += api.o cipher.o digest.o compress.o \
+obj-$(CONFIG_CRYPTO) += api.o cipher.o digest.o compress.o chksum.o \
$(proc-crypto-y)

obj-$(CONFIG_CRYPTO_HMAC) += hmac.o
obj-$(CONFIG_CRYPTO_NULL) += crypto_null.o
+obj-$(CONFIG_CRYPTO_CRC32C) += crc32c.o
obj-$(CONFIG_CRYPTO_MD4) += md4.o
obj-$(CONFIG_CRYPTO_MD5) += md5.o
obj-$(CONFIG_CRYPTO_SHA1) += sha1.o
diff -urN --exclude '*.ko' --exclude '*.mod.*' --exclude '*~' --exclude '*.o*' --exclude '.*' --exclude '*.cmd' --exclude drivers linux-2.6.1.orig/crypto/api.c linux/crypto/api.c
--- linux-2.6.1.orig/crypto/api.c Fri Jan 9 01:00:04 2004
+++ linux/crypto/api.c Mon Jan 12 10:33:59 2004
@@ -68,6 +68,9 @@
case CRYPTO_ALG_TYPE_COMPRESS:
return crypto_init_compress_flags(tfm, flags);

+ case CRYPTO_ALG_TYPE_CHKSUM:
+ return crypto_init_chksum_flags(tfm, flags);
+
default:
break;
}
@@ -88,6 +91,9 @@
case CRYPTO_ALG_TYPE_COMPRESS:
return crypto_init_compress_ops(tfm);

+ case CRYPTO_ALG_TYPE_CHKSUM:
+ return crypto_init_chksum_ops(tfm);
+
default:
break;
}
@@ -111,6 +117,10 @@
crypto_exit_compress_ops(tfm);
break;

+ case CRYPTO_ALG_TYPE_CHKSUM:
+ crypto_exit_chksum_ops(tfm);
+ break;
+
default:
BUG();

diff -urN --exclude '*.ko' --exclude '*.mod.*' --exclude '*~' --exclude '*.o*' --exclude '.*' --exclude '*.cmd' --exclude drivers linux-2.6.1.orig/crypto/chksum.c linux/crypto/chksum.c
--- linux-2.6.1.orig/crypto/chksum.c Wed Dec 31 18:00:00 1969
+++ linux/crypto/chksum.c Mon Jan 12 10:33:59 2004
@@ -0,0 +1,89 @@
+/*
+ * Cryptographic API.
+ *
+ * Chksum/CRC operations.
+ *
+ * Copyright (c) 2003 Clay Haapala (clay@haapi.mn.org)
+ * cribbed from digest code by James Morris <jmorris@intercode.com.au>
+ *
+ * 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/crypto.h>
+#include <linux/mm.h>
+#include <linux/errno.h>
+#include <linux/highmem.h>
+#include <asm/scatterlist.h>
+#include "internal.h"
+
+static void init(struct crypto_tfm *tfm)
+{
+ tfm->__crt_alg->cra_chksum.cha_init(crypto_tfm_ctx(tfm));
+}
+
+static void setseed(struct crypto_tfm *tfm, const u32 seed)
+{
+ tfm->__crt_alg->cra_chksum.cha_setseed(crypto_tfm_ctx(tfm), seed);
+}
+
+static void update(struct crypto_tfm *tfm,
+ struct scatterlist *sg, unsigned int nsg)
+{
+ unsigned int i;
+
+ for (i = 0; i < nsg; i++) {
+ char *p = crypto_kmap(sg[i].page, 0) + sg[i].offset;
+ tfm->__crt_alg->cra_chksum.cha_update(crypto_tfm_ctx(tfm),
+ p, sg[i].length);
+ crypto_kunmap(p, 0);
+ crypto_yield(tfm);
+ }
+}
+
+static void final(struct crypto_tfm *tfm, u32 *out)
+{
+ tfm->__crt_alg->cra_chksum.cha_final(crypto_tfm_ctx(tfm), out);
+}
+
+static void digest(struct crypto_tfm *tfm,
+ struct scatterlist *sg, unsigned int nsg, u32 *out)
+{
+ unsigned int i;
+
+ tfm->crt_chksum.cht_init(tfm);
+
+ for (i = 0; i < nsg; i++) {
+ char *p = crypto_kmap(sg[i].page, 0) + sg[i].offset;
+ tfm->__crt_alg->cra_chksum.cha_update(crypto_tfm_ctx(tfm),
+ p, sg[i].length);
+ crypto_kunmap(p, 0);
+ crypto_yield(tfm);
+ }
+ crypto_chksum_final(tfm, out);
+}
+
+int crypto_init_chksum_flags(struct crypto_tfm *tfm, u32 flags)
+{
+ return flags ? -EINVAL : 0;
+}
+
+int crypto_init_chksum_ops(struct crypto_tfm *tfm)
+{
+ struct chksum_tfm *ops = &tfm->crt_chksum;
+
+ ops->cht_init = init;
+ ops->cht_setseed = setseed;
+ ops->cht_update = update;
+ ops->cht_final = final;
+ ops->cht_digest = digest;
+
+ return 0;
+}
+
+void crypto_exit_chksum_ops(struct crypto_tfm *tfm)
+{
+ return;
+}
diff -urN --exclude '*.ko' --exclude '*.mod.*' --exclude '*~' --exclude '*.o*' --exclude '.*' --exclude '*.cmd' --exclude drivers linux-2.6.1.orig/crypto/crc32c.c linux/crypto/crc32c.c
--- linux-2.6.1.orig/crypto/crc32c.c Wed Dec 31 18:00:00 1969
+++ linux/crypto/crc32c.c Wed Jan 14 11:40:25 2004
@@ -0,0 +1,203 @@
+/*
+ * Cryptographic API.
+ *
+ * CRC32C
+ *
+ *@Article{castagnoli-crc,
+ * author = { Guy Castagnoli and Stefan Braeuer and Martin Herrman},
+ * title = {{Optimization of Cyclic Redundancy-Check Codes with 24
+ * and 32 Parity Bits}},
+ * journal = IEEE Transactions on Communication,
+ * year = {1993},
+ * volume = {41},
+ * number = {6},
+ * pages = {},
+ * month = {June},
+ *}
+ * Used by the iSCSI driver, possibly others, and derived from the
+ * the iscsi-crc.c module of the linux-iscsi driver at
+ * http://linux-iscsi.sourceforge.net.
+ *
+ * Following the example of lib/crc32, this function is intended to be
+ * flexible and useful for all users. Modules that currently have their
+ * own crc32c, but hopefully may be able to use this one are:
+ * <ul>
+ * <li>net/sctp (please add all your doco to here if you change to
+ * use these routines)
+ * </li>
+ * </ul>
+ *
+ * Copyright (c) 2003 Cisco Systems, Inc.
+ *
+ * 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 <asm/byteorder.h>
+
+#define CHKSUM_BLOCK_SIZE 32
+#define CHKSUM_DIGEST_SIZE 32
+
+struct chksum_ctx {
+ u32 crc;
+};
+
+/*
+ * This is the CRC-32C table
+ * Generated with:
+ * width = 32 bits
+ * poly = 0x1EDC6F41
+ * reflect input bytes = true
+ * reflect output bytes = true
+ */
+
+static u32 crc32c_table[256] = {
+ 0x00000000L, 0xF26B8303L, 0xE13B70F7L, 0x1350F3F4L,
+ 0xC79A971FL, 0x35F1141CL, 0x26A1E7E8L, 0xD4CA64EBL,
+ 0x8AD958CFL, 0x78B2DBCCL, 0x6BE22838L, 0x9989AB3BL,
+ 0x4D43CFD0L, 0xBF284CD3L, 0xAC78BF27L, 0x5E133C24L,
+ 0x105EC76FL, 0xE235446CL, 0xF165B798L, 0x030E349BL,
+ 0xD7C45070L, 0x25AFD373L, 0x36FF2087L, 0xC494A384L,
+ 0x9A879FA0L, 0x68EC1CA3L, 0x7BBCEF57L, 0x89D76C54L,
+ 0x5D1D08BFL, 0xAF768BBCL, 0xBC267848L, 0x4E4DFB4BL,
+ 0x20BD8EDEL, 0xD2D60DDDL, 0xC186FE29L, 0x33ED7D2AL,
+ 0xE72719C1L, 0x154C9AC2L, 0x061C6936L, 0xF477EA35L,
+ 0xAA64D611L, 0x580F5512L, 0x4B5FA6E6L, 0xB93425E5L,
+ 0x6DFE410EL, 0x9F95C20DL, 0x8CC531F9L, 0x7EAEB2FAL,
+ 0x30E349B1L, 0xC288CAB2L, 0xD1D83946L, 0x23B3BA45L,
+ 0xF779DEAEL, 0x05125DADL, 0x1642AE59L, 0xE4292D5AL,
+ 0xBA3A117EL, 0x4851927DL, 0x5B016189L, 0xA96AE28AL,
+ 0x7DA08661L, 0x8FCB0562L, 0x9C9BF696L, 0x6EF07595L,
+ 0x417B1DBCL, 0xB3109EBFL, 0xA0406D4BL, 0x522BEE48L,
+ 0x86E18AA3L, 0x748A09A0L, 0x67DAFA54L, 0x95B17957L,
+ 0xCBA24573L, 0x39C9C670L, 0x2A993584L, 0xD8F2B687L,
+ 0x0C38D26CL, 0xFE53516FL, 0xED03A29BL, 0x1F682198L,
+ 0x5125DAD3L, 0xA34E59D0L, 0xB01EAA24L, 0x42752927L,
+ 0x96BF4DCCL, 0x64D4CECFL, 0x77843D3BL, 0x85EFBE38L,
+ 0xDBFC821CL, 0x2997011FL, 0x3AC7F2EBL, 0xC8AC71E8L,
+ 0x1C661503L, 0xEE0D9600L, 0xFD5D65F4L, 0x0F36E6F7L,
+ 0x61C69362L, 0x93AD1061L, 0x80FDE395L, 0x72966096L,
+ 0xA65C047DL, 0x5437877EL, 0x4767748AL, 0xB50CF789L,
+ 0xEB1FCBADL, 0x197448AEL, 0x0A24BB5AL, 0xF84F3859L,
+ 0x2C855CB2L, 0xDEEEDFB1L, 0xCDBE2C45L, 0x3FD5AF46L,
+ 0x7198540DL, 0x83F3D70EL, 0x90A324FAL, 0x62C8A7F9L,
+ 0xB602C312L, 0x44694011L, 0x5739B3E5L, 0xA55230E6L,
+ 0xFB410CC2L, 0x092A8FC1L, 0x1A7A7C35L, 0xE811FF36L,
+ 0x3CDB9BDDL, 0xCEB018DEL, 0xDDE0EB2AL, 0x2F8B6829L,
+ 0x82F63B78L, 0x709DB87BL, 0x63CD4B8FL, 0x91A6C88CL,
+ 0x456CAC67L, 0xB7072F64L, 0xA457DC90L, 0x563C5F93L,
+ 0x082F63B7L, 0xFA44E0B4L, 0xE9141340L, 0x1B7F9043L,
+ 0xCFB5F4A8L, 0x3DDE77ABL, 0x2E8E845FL, 0xDCE5075CL,
+ 0x92A8FC17L, 0x60C37F14L, 0x73938CE0L, 0x81F80FE3L,
+ 0x55326B08L, 0xA759E80BL, 0xB4091BFFL, 0x466298FCL,
+ 0x1871A4D8L, 0xEA1A27DBL, 0xF94AD42FL, 0x0B21572CL,
+ 0xDFEB33C7L, 0x2D80B0C4L, 0x3ED04330L, 0xCCBBC033L,
+ 0xA24BB5A6L, 0x502036A5L, 0x4370C551L, 0xB11B4652L,
+ 0x65D122B9L, 0x97BAA1BAL, 0x84EA524EL, 0x7681D14DL,
+ 0x2892ED69L, 0xDAF96E6AL, 0xC9A99D9EL, 0x3BC21E9DL,
+ 0xEF087A76L, 0x1D63F975L, 0x0E330A81L, 0xFC588982L,
+ 0xB21572C9L, 0x407EF1CAL, 0x532E023EL, 0xA145813DL,
+ 0x758FE5D6L, 0x87E466D5L, 0x94B49521L, 0x66DF1622L,
+ 0x38CC2A06L, 0xCAA7A905L, 0xD9F75AF1L, 0x2B9CD9F2L,
+ 0xFF56BD19L, 0x0D3D3E1AL, 0x1E6DCDEEL, 0xEC064EEDL,
+ 0xC38D26C4L, 0x31E6A5C7L, 0x22B65633L, 0xD0DDD530L,
+ 0x0417B1DBL, 0xF67C32D8L, 0xE52CC12CL, 0x1747422FL,
+ 0x49547E0BL, 0xBB3FFD08L, 0xA86F0EFCL, 0x5A048DFFL,
+ 0x8ECEE914L, 0x7CA56A17L, 0x6FF599E3L, 0x9D9E1AE0L,
+ 0xD3D3E1ABL, 0x21B862A8L, 0x32E8915CL, 0xC083125FL,
+ 0x144976B4L, 0xE622F5B7L, 0xF5720643L, 0x07198540L,
+ 0x590AB964L, 0xAB613A67L, 0xB831C993L, 0x4A5A4A90L,
+ 0x9E902E7BL, 0x6CFBAD78L, 0x7FAB5E8CL, 0x8DC0DD8FL,
+ 0xE330A81AL, 0x115B2B19L, 0x020BD8EDL, 0xF0605BEEL,
+ 0x24AA3F05L, 0xD6C1BC06L, 0xC5914FF2L, 0x37FACCF1L,
+ 0x69E9F0D5L, 0x9B8273D6L, 0x88D28022L, 0x7AB90321L,
+ 0xAE7367CAL, 0x5C18E4C9L, 0x4F48173DL, 0xBD23943EL,
+ 0xF36E6F75L, 0x0105EC76L, 0x12551F82L, 0xE03E9C81L,
+ 0x34F4F86AL, 0xC69F7B69L, 0xD5CF889DL, 0x27A40B9EL,
+ 0x79B737BAL, 0x8BDCB4B9L, 0x988C474DL, 0x6AE7C44EL,
+ 0xBE2DA0A5L, 0x4C4623A6L, 0x5F16D052L, 0xAD7D5351L
+};
+
+/*
+ * 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 void chksum_setseed(void *ctx, const u32 seed)
+{
+ struct chksum_ctx *mctx = ctx;
+
+ mctx->crc = __cpu_to_le32(seed);
+}
+
+static void chksum_update(void *ctx, u8 const *data, size_t length)
+{
+ struct chksum_ctx *mctx = ctx;
+ u32 mcrc = mctx->crc;
+
+ while (length--)
+ mcrc = crc32c_table[(mcrc ^ *data++) & 0xFFL] ^ (mcrc >> 8);
+
+ mctx->crc = mcrc;
+}
+
+static void chksum_final(void *ctx, u32 *out)
+{
+ struct chksum_ctx *mctx = ctx;
+ u32 mcrc = (mctx->crc ^ ~(u32)0);
+
+ *out = __le32_to_cpu(mcrc);
+}
+
+static struct crypto_alg alg = {
+ .cra_name = "crc32c",
+ .cra_flags = CRYPTO_ALG_TYPE_CHKSUM,
+ .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 = {
+ .chksum = {
+ .cha_digestsize= CHKSUM_DIGEST_SIZE,
+ .cha_init = chksum_init,
+ .cha_setseed = chksum_setseed,
+ .cha_update = chksum_update,
+ .cha_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");
+MODULE_LICENSE("GPL and additional rights");
diff -urN --exclude '*.ko' --exclude '*.mod.*' --exclude '*~' --exclude '*.o*' --exclude '.*' --exclude '*.cmd' --exclude drivers linux-2.6.1.orig/crypto/internal.h linux/crypto/internal.h
--- linux-2.6.1.orig/crypto/internal.h Fri Jan 9 00:59:04 2004
+++ linux/crypto/internal.h Mon Jan 12 10:33:59 2004
@@ -79,14 +79,17 @@
int crypto_init_digest_flags(struct crypto_tfm *tfm, u32 flags);
int crypto_init_cipher_flags(struct crypto_tfm *tfm, u32 flags);
int crypto_init_compress_flags(struct crypto_tfm *tfm, u32 flags);
+int crypto_init_chksum_flags(struct crypto_tfm *tfm, u32 flags);

int crypto_init_digest_ops(struct crypto_tfm *tfm);
int crypto_init_cipher_ops(struct crypto_tfm *tfm);
int crypto_init_compress_ops(struct crypto_tfm *tfm);
+int crypto_init_chksum_ops(struct crypto_tfm *tfm);

void crypto_exit_digest_ops(struct crypto_tfm *tfm);
void crypto_exit_cipher_ops(struct crypto_tfm *tfm);
void crypto_exit_compress_ops(struct crypto_tfm *tfm);
+void crypto_exit_chksum_ops(struct crypto_tfm *tfm);

#endif /* _CRYPTO_INTERNAL_H */

diff -urN --exclude '*.ko' --exclude '*.mod.*' --exclude '*~' --exclude '*.o*' --exclude '.*' --exclude '*.cmd' --exclude drivers linux-2.6.1.orig/crypto/tcrypt.c linux/crypto/tcrypt.c
--- linux-2.6.1.orig/crypto/tcrypt.c Fri Jan 9 00:59:56 2004
+++ linux/crypto/tcrypt.c Wed Jan 14 11:43:12 2004
@@ -61,7 +61,7 @@
static char *check[] = {
"des", "md5", "des3_ede", "rot13", "sha1", "sha256", "blowfish",
"twofish", "serpent", "sha384", "sha512", "md4", "aes", "cast6",
- "deflate", NULL
+ "deflate", "crc32c", NULL
};

static void
@@ -492,6 +492,102 @@
}

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 initted to %08x: %s\n";
+#define SEEDTESTVAL 0xedcba987
+
+ printk("\ntesting crc32c\n");
+
+ tfm = crypto_alloc_tfm("crc32c", 0);
+ if (tfm == NULL) {
+ printk("failed to load transform for crc32c\n");
+ return;
+ }
+
+ crypto_chksum_init(tfm);
+ crypto_chksum_final(tfm, &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;
+ }
+
+ crypto_chksum_setseed(tfm, SEEDTESTVAL);
+ crypto_chksum_final(tfm, &crc);
+ printk("testing crc32c setseed 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++) {
+ crypto_chksum_setseed(tfm, ~(u32)0);
+ crypto_chksum_update(tfm, &sg[i], 1);
+ crypto_chksum_final(tfm, &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++) {
+ crypto_chksum_setseed(tfm, (crc ^ ~(u32)0));
+ crypto_chksum_update(tfm, &sg[i], 1);
+ crypto_chksum_final(tfm, &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");
+ crypto_chksum_setseed(tfm, ~(u32)0);
+ crypto_chksum_digest(tfm, sg, NUMVEC, &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;
@@ -558,7 +654,8 @@

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);
@@ -638,6 +735,10 @@
test_cipher ("cast6", MODE_ECB, DECRYPT, cast6_dec_tv_template, CAST6_DEC_TEST_VECTORS);
break;

+ case 16:
+ test_crc32c();
+ break;
+
#ifdef CONFIG_CRYPTO_HMAC
case 100:
test_hmac("md5", hmac_md5_tv_template, HMAC_MD5_TEST_VECTORS);
diff -urN --exclude '*.ko' --exclude '*.mod.*' --exclude '*~' --exclude '*.o*' --exclude '.*' --exclude '*.cmd' --exclude drivers linux-2.6.1.orig/include/linux/crypto.h linux/include/linux/crypto.h
--- linux-2.6.1.orig/include/linux/crypto.h Fri Jan 9 00:59:19 2004
+++ linux/include/linux/crypto.h Wed Jan 14 11:26:39 2004
@@ -30,7 +30,7 @@
#define CRYPTO_ALG_TYPE_CIPHER 0x00000001
#define CRYPTO_ALG_TYPE_DIGEST 0x00000002
#define CRYPTO_ALG_TYPE_COMPRESS 0x00000004
-
+#define CRYPTO_ALG_TYPE_CHKSUM 0x00000008
/*
* Transform masks and values (for crt_flags).
*/
@@ -87,9 +87,18 @@
u8 *dst, unsigned int *dlen);
};

+struct chksum_alg {
+ unsigned int cha_digestsize;
+ void (*cha_init)(void *ctx);
+ void (*cha_setseed)(void *ctx, const u32 seed);
+ void (*cha_update)(void *ctx, const u8 *data, unsigned int len);
+ void (*cha_final)(void *ctx, u32 *out);
+};
+
#define cra_cipher cra_u.cipher
#define cra_digest cra_u.digest
#define cra_compress cra_u.compress
+#define cra_chksum cra_u.chksum

struct crypto_alg {
struct list_head cra_list;
@@ -102,6 +111,7 @@
struct cipher_alg cipher;
struct digest_alg digest;
struct compress_alg compress;
+ struct chksum_alg chksum;
} cra_u;

struct module *cra_module;
@@ -171,9 +181,23 @@
u8 *dst, unsigned int *dlen);
};

+/*
+ * Setting the seed allows arbitrary accumulators and flexible XOR policy
+ */
+struct chksum_tfm {
+ void (*cht_init)(struct crypto_tfm *tfm); /* inits to ~0 */
+ void (*cht_setseed)(struct crypto_tfm *tfm, const u32 seed);
+ void (*cht_update)(struct crypto_tfm *tfm,
+ struct scatterlist *sg, unsigned int nsg);
+ void (*cht_final)(struct crypto_tfm *tfm, u32 *out);
+ void (*cht_digest)(struct crypto_tfm *tfm, struct scatterlist *sg,
+ unsigned int nsg, u32 *out);
+};
+
#define crt_cipher crt_u.cipher
#define crt_digest crt_u.digest
#define crt_compress crt_u.compress
+#define crt_chksum crt_u.chksum

struct crypto_tfm {

@@ -183,6 +207,7 @@
struct cipher_tfm cipher;
struct digest_tfm digest;
struct compress_tfm compress;
+ struct chksum_tfm chksum;
} crt_u;

struct crypto_alg *__crt_alg;
@@ -357,6 +382,49 @@
return tfm->crt_compress.cot_decompress(tfm, src, slen, dst, dlen);
}

+static inline void crypto_chksum_init(struct crypto_tfm *tfm)
+{
+ BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CHKSUM);
+ tfm->crt_chksum.cht_init(tfm);
+}
+
+/*
+ * If your algorithm normally inits with ~0, then you
+ * must XOR your seed with ~0 before calling setseed().
+ */
+static inline void crypto_chksum_setseed(struct crypto_tfm *tfm,
+ const u32 seed)
+{
+ BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CHKSUM);
+ tfm->crt_chksum.cht_setseed(tfm, seed);
+}
+
+static inline void crypto_chksum_update(struct crypto_tfm *tfm,
+ struct scatterlist *sg,
+ unsigned int nsg)
+{
+ BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CHKSUM);
+ tfm->crt_chksum.cht_update(tfm, sg, nsg);
+}
+
+/*
+ * This function will XOR the results with ~0, so take that into
+ * account.
+ */
+static inline void crypto_chksum_final(struct crypto_tfm *tfm, u32 *out)
+{
+ BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CHKSUM);
+ tfm->crt_chksum.cht_final(tfm, out);
+}
+
+static inline void crypto_chksum_digest(struct crypto_tfm *tfm,
+ struct scatterlist *sg,
+ unsigned int nsg, u32 *out)
+{
+ BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CHKSUM);
+ tfm->crt_chksum.cht_digest(tfm, sg, nsg, out);
+}
+
/*
* HMAC support.
*/--
Clay Haapala (chaapala@cisco.com) Cisco Systems SRBU +1 763-398-1056
6450 Wedgwood Rd, Suite 130 Maple Grove MN 55311 PGP: C89240AD
Funny, I didn't think Haliburton was into aerospace.
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