media: ov5640: change 1080p resolution to 1088p
[linux-2.6.git] / crypto / crc32c.c
index 256956c..3f9ad28 100644 (file)
-/* 
+/*
  * Cryptographic API.
  *
  * CRC32C chksum
  *
- * This module file is a wrapper to invoke the lib/crc32c routines.
+ *@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:
+ *  net/sctp (please add all your doco to here if you change to
+ *            use this one!)
+ *  <endoflist>
+ *
+ * Copyright (c) 2004 Cisco Systems, Inc.
+ * Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.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) 
+ * Software Foundation; either version 2 of the License, or (at your option)
  * any later version.
  *
  */
+
+#include <crypto/internal/hash.h>
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/string.h>
-#include <linux/crypto.h>
-#include <linux/crc32c.h>
-#include <asm/byteorder.h>
+#include <linux/kernel.h>
 
-#define CHKSUM_BLOCK_SIZE      32
+#define CHKSUM_BLOCK_SIZE      1
 #define CHKSUM_DIGEST_SIZE     4
 
 struct chksum_ctx {
+       u32 key;
+};
+
+struct chksum_desc_ctx {
        u32 crc;
 };
 
 /*
- * Steps through buffer one byte at at time, calculates reflected 
+ * This is the CRC-32C table
+ * Generated with:
+ * width = 32 bits
+ * poly = 0x1EDC6F41
+ * reflect input bytes = true
+ * reflect output bytes = true
+ */
+
+static const 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 u32 crc32c(u32 crc, const u8 *data, unsigned int length)
+{
+       while (length--)
+               crc = crc32c_table[(crc ^ *data++) & 0xFFL] ^ (crc >> 8);
+
+       return crc;
+}
+
+/*
+ * Steps through buffer one byte at at time, calculates reflected
  * crc using table.
  */
 
-static void chksum_init(void *ctx)
+static int chksum_init(struct shash_desc *desc)
 {
-       struct chksum_ctx *mctx = ctx;
+       struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
+       struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
+
+       ctx->crc = mctx->key;
 
-       mctx->crc = ~(u32)0;                    /* common usage */
+       return 0;
 }
 
 /*
@@ -42,68 +161,99 @@ static void chksum_init(void *ctx)
  * 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)
+static int chksum_setkey(struct crypto_shash *tfm, const u8 *key,
+                        unsigned int keylen)
 {
-       struct chksum_ctx *mctx = ctx;
+       struct chksum_ctx *mctx = crypto_shash_ctx(tfm);
 
-       if (keylen != sizeof(mctx->crc)) {
-               if (flags)
-                       *flags = CRYPTO_TFM_RES_BAD_KEY_LEN;
+       if (keylen != sizeof(mctx->key)) {
+               crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
                return -EINVAL;
        }
-       mctx->crc = __cpu_to_le32(*(u32 *)key);
+       mctx->key = le32_to_cpu(*(__le32 *)key);
+       return 0;
+}
+
+static int chksum_update(struct shash_desc *desc, const u8 *data,
+                        unsigned int length)
+{
+       struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
+
+       ctx->crc = crc32c(ctx->crc, data, length);
+       return 0;
+}
+
+static int chksum_final(struct shash_desc *desc, u8 *out)
+{
+       struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
+
+       *(__le32 *)out = ~cpu_to_le32p(&ctx->crc);
+       return 0;
+}
+
+static int __chksum_finup(u32 *crcp, const u8 *data, unsigned int len, u8 *out)
+{
+       *(__le32 *)out = ~cpu_to_le32(crc32c(*crcp, data, len));
        return 0;
 }
 
-static void chksum_update(void *ctx, const u8 *data, unsigned int length)
+static int chksum_finup(struct shash_desc *desc, const u8 *data,
+                       unsigned int len, u8 *out)
 {
-       struct chksum_ctx *mctx = ctx;
-       u32 mcrc;
+       struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
 
-       mcrc = crc32c(mctx->crc, data, (size_t)length);
+       return __chksum_finup(&ctx->crc, data, len, out);
+}
+
+static int chksum_digest(struct shash_desc *desc, const u8 *data,
+                        unsigned int length, u8 *out)
+{
+       struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
 
-       mctx->crc = mcrc;
+       return __chksum_finup(&mctx->key, data, length, out);
 }
 
-static void chksum_final(void *ctx, u8 *out)
+static int crc32c_cra_init(struct crypto_tfm *tfm)
 {
-       struct chksum_ctx *mctx = ctx;
-       u32 mcrc = (mctx->crc ^ ~(u32)0);
-       
-       *(u32 *)out = __le32_to_cpu(mcrc);
+       struct chksum_ctx *mctx = crypto_tfm_ctx(tfm);
+
+       mctx->key = ~0;
+       return 0;
 }
 
-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 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_blocksize          =       CHKSUM_BLOCK_SIZE,
+               .cra_alignmask          =       3,
+               .cra_ctxsize            =       sizeof(struct chksum_ctx),
+               .cra_module             =       THIS_MODULE,
+               .cra_init               =       crc32c_cra_init,
        }
 };
 
-static int __init init(void)
+static int __init crc32c_mod_init(void)
 {
-       return crypto_register_alg(&alg);
+       return crypto_register_shash(&alg);
 }
 
-static void __exit fini(void)
+static void __exit crc32c_mod_fini(void)
 {
-       crypto_unregister_alg(&alg);
+       crypto_unregister_shash(&alg);
 }
 
-module_init(init);
-module_exit(fini);
+module_init(crc32c_mod_init);
+module_exit(crc32c_mod_fini);
 
 MODULE_AUTHOR("Clay Haapala <chaapala@cisco.com>");
 MODULE_DESCRIPTION("CRC32c (Castagnoli) calculations wrapper for lib/crc32c");