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Diffstat (limited to 'package/kernel/lantiq/ltq-deu/src/ifxmips_md5_hmac.c')
| -rw-r--r-- | package/kernel/lantiq/ltq-deu/src/ifxmips_md5_hmac.c | 386 |
1 files changed, 386 insertions, 0 deletions
diff --git a/package/kernel/lantiq/ltq-deu/src/ifxmips_md5_hmac.c b/package/kernel/lantiq/ltq-deu/src/ifxmips_md5_hmac.c new file mode 100644 index 0000000..fc6f52e --- /dev/null +++ b/package/kernel/lantiq/ltq-deu/src/ifxmips_md5_hmac.c @@ -0,0 +1,386 @@ +/****************************************************************************** +** +** FILE NAME : ifxmips_md5_hmac.c +** PROJECT : IFX UEIP +** MODULES : DEU Module for UEIP +** +** DATE : September 8, 2009 +** AUTHOR : Mohammad Firdaus +** DESCRIPTION : Data Encryption Unit Driver +** COPYRIGHT : Copyright (c) 2009 +** Infineon Technologies AG +** Am Campeon 1-12, 85579 Neubiberg, Germany +** +** 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. +** +** HISTORY +** $Date $Author $Comment +** 08,Sept 2009 Mohammad Firdaus Initial UEIP release +** 21,March 2011 Mohammad Firdaus Changes for Kernel 2.6.32 and IPSec integration +*******************************************************************************/ +/*! + \defgroup IFX_DEU IFX_DEU_DRIVERS + \ingroup API + \brief ifx deu driver module +*/ + +/*! + \file ifxmips_md5_hmac.c + \ingroup IFX_DEU + \brief MD5-HMAC encryption deu driver file +*/ + +/*! + \defgroup IFX_MD5_HMAC_FUNCTIONS IFX_MD5_HMAC_FUNCTIONS + \ingroup IFX_DEU + \brief ifx md5-hmac driver functions +*/ + +/* Project Header files */ +#include <linux/init.h> +#include <linux/module.h> +#include <linux/string.h> +#include <linux/crypto.h> +#include <linux/types.h> +#include <crypto/internal/hash.h> +#include <asm/byteorder.h> + +#if defined(CONFIG_AR9) +#include "ifxmips_deu_ar9.h" +#elif defined(CONFIG_VR9) || defined(CONFIG_AR10) +#include "ifxmips_deu_vr9.h" +#else +#error "Plaform Unknwon!" +#endif + +#define MD5_DIGEST_SIZE 16 +#define MD5_HMAC_BLOCK_SIZE 64 +#define MD5_BLOCK_WORDS 16 +#define MD5_HASH_WORDS 4 +#define MD5_HMAC_DBN_TEMP_SIZE 1024 // size in dword, needed for dbn workaround +#define HASH_START IFX_HASH_CON + +static spinlock_t lock; +#define CRTCL_SECT_INIT spin_lock_init(&lock) +#define CRTCL_SECT_START spin_lock_irqsave(&lock, flag) +#define CRTCL_SECT_END spin_unlock_irqrestore(&lock, flag) + +//#define CRYPTO_DEBUG +#ifdef CRYPTO_DEBUG +extern char debug_level; +#define DPRINTF(level, format, args...) if (level < debug_level) printk(KERN_INFO "[%s %s %d]: " format, __FILE__, __func__, __LINE__, ##args); +#else +#define DPRINTF(level, format, args...) +#endif + +#define MAX_HASH_KEYLEN 64 + +struct md5_hmac_ctx { + u8 key[MAX_HASH_KEYLEN]; + u32 hash[MD5_HASH_WORDS]; + u32 block[MD5_BLOCK_WORDS]; + u64 byte_count; + u32 dbn; + unsigned int keylen; +}; + +static u32 temp[MD5_HMAC_DBN_TEMP_SIZE]; + +extern int disable_deudma; + +/*! \fn static u32 endian_swap(u32 input) + * \ingroup IFX_MD5_HMAC_FUNCTIONS + * \brief perform dword level endian swap + * \param input value of dword that requires to be swapped +*/ +static u32 endian_swap(u32 input) +{ + u8 *ptr = (u8 *)&input; + + return ((ptr[3] << 24) | (ptr[2] << 16) | (ptr[1] << 8) | ptr[0]); +} + +/*! \fn static void md5_hmac_transform(struct crypto_tfm *tfm, u32 const *in) + * \ingroup IFX_MD5_HMAC_FUNCTIONS + * \brief save input block to context + * \param tfm linux crypto algo transform + * \param in 64-byte block of input +*/ +static void md5_hmac_transform(struct shash_desc *desc, u32 const *in) +{ + struct md5_hmac_ctx *mctx = crypto_shash_ctx(desc->tfm); + + memcpy(&temp[mctx->dbn<<4], in, 64); //dbn workaround + mctx->dbn += 1; + + if ( (mctx->dbn<<4) > MD5_HMAC_DBN_TEMP_SIZE ) + { + printk("MD5_HMAC_DBN_TEMP_SIZE exceeded\n"); + } + +} + +/*! \fn int md5_hmac_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen) + * \ingroup IFX_MD5_HMAC_FUNCTIONS + * \brief sets md5 hmac key + * \param tfm linux crypto algo transform + * \param key input key + * \param keylen key length greater than 64 bytes IS NOT SUPPORTED +*/ +static int md5_hmac_setkey(struct crypto_shash *tfm, const u8 *key, unsigned int keylen) +{ + struct md5_hmac_ctx *mctx = crypto_shash_ctx(tfm); + volatile struct deu_hash_t *hash = (struct deu_hash_t *) HASH_START; + //printk("copying keys to context with length %d\n", keylen); + + if (keylen > MAX_HASH_KEYLEN) { + printk("Key length more than what DEU hash can handle\n"); + return -EINVAL; + } + + + hash->KIDX |= 0x80000000; // reset all 16 words of the key to '0' + memcpy(&mctx->key, key, keylen); + mctx->keylen = keylen; + + return 0; + +} + + +/*! \fn int md5_hmac_setkey_hw(const u8 *key, unsigned int keylen) + * \ingroup IFX_MD5_HMAC_FUNCTIONS + * \brief sets md5 hmac key into the hardware registers + * \param key input key + * \param keylen key length greater than 64 bytes IS NOT SUPPORTED +*/ + +static int md5_hmac_setkey_hw(const u8 *key, unsigned int keylen) +{ + volatile struct deu_hash_t *hash = (struct deu_hash_t *) HASH_START; + unsigned long flag; + int i, j; + u32 *in_key = (u32 *)key; + + //printk("\nsetkey keylen: %d\n key: ", keylen); + + CRTCL_SECT_START; + j = 0; + for (i = 0; i < keylen; i+=4) + { + hash->KIDX = j; + asm("sync"); + hash->KEY = *((u32 *) in_key + j); + asm("sync"); + j++; + } + CRTCL_SECT_END; + + return 0; +} + +/*! \fn void md5_hmac_init(struct crypto_tfm *tfm) + * \ingroup IFX_MD5_HMAC_FUNCTIONS + * \brief initialize md5 hmac context + * \param tfm linux crypto algo transform +*/ +static int md5_hmac_init(struct shash_desc *desc) +{ + + struct md5_hmac_ctx *mctx = crypto_shash_ctx(desc->tfm); + + + mctx->dbn = 0; //dbn workaround + md5_hmac_setkey_hw(mctx->key, mctx->keylen); + + return 0; +} +EXPORT_SYMBOL(md5_hmac_init); + +/*! \fn void md5_hmac_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len) + * \ingroup IFX_MD5_HMAC_FUNCTIONS + * \brief on-the-fly md5 hmac computation + * \param tfm linux crypto algo transform + * \param data input data + * \param len size of input data +*/ +static int md5_hmac_update(struct shash_desc *desc, const u8 *data, unsigned int len) +{ + struct md5_hmac_ctx *mctx = crypto_shash_ctx(desc->tfm); + const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f); + + mctx->byte_count += len; + + if (avail > len) { + memcpy((char *)mctx->block + (sizeof(mctx->block) - avail), + data, len); + return 0; + } + + memcpy((char *)mctx->block + (sizeof(mctx->block) - avail), + data, avail); + + md5_hmac_transform(desc, mctx->block); + data += avail; + len -= avail; + + while (len >= sizeof(mctx->block)) { + memcpy(mctx->block, data, sizeof(mctx->block)); + md5_hmac_transform(desc, mctx->block); + data += sizeof(mctx->block); + len -= sizeof(mctx->block); + } + + memcpy(mctx->block, data, len); + return 0; +} +EXPORT_SYMBOL(md5_hmac_update); + +/*! \fn void md5_hmac_final(struct crypto_tfm *tfm, u8 *out) + * \ingroup IFX_MD5_HMAC_FUNCTIONS + * \brief compute final md5 hmac value + * \param tfm linux crypto algo transform + * \param out final md5 hmac output value +*/ +static int md5_hmac_final(struct shash_desc *desc, u8 *out) +{ + struct md5_hmac_ctx *mctx = crypto_shash_ctx(desc->tfm); + const unsigned int offset = mctx->byte_count & 0x3f; + char *p = (char *)mctx->block + offset; + int padding = 56 - (offset + 1); + volatile struct deu_hash_t *hashs = (struct deu_hash_t *) HASH_START; + unsigned long flag; + int i = 0; + int dbn; + u32 *in = &temp[0]; + + + *p++ = 0x80; + if (padding < 0) { + memset(p, 0x00, padding + sizeof (u64)); + md5_hmac_transform(desc, mctx->block); + p = (char *)mctx->block; + padding = 56; + } + + memset(p, 0, padding); + mctx->block[14] = endian_swap((mctx->byte_count + 64) << 3); // need to add 512 bit of the IPAD operation + mctx->block[15] = 0x00000000; + + md5_hmac_transform(desc, mctx->block); + + CRTCL_SECT_START; + + //printk("\ndbn = %d\n", mctx->dbn); + hashs->DBN = mctx->dbn; + asm("sync"); + + *IFX_HASH_CON = 0x0703002D; //khs, go, init, ndc, endi, kyue, hmen, md5 + + //wait for processing + while (hashs->controlr.BSY) { + // this will not take long + } + + for (dbn = 0; dbn < mctx->dbn; dbn++) + { + for (i = 0; i < 16; i++) { + hashs->MR = in[i]; + }; + + hashs->controlr.GO = 1; + asm("sync"); + + //wait for processing + while (hashs->controlr.BSY) { + // this will not take long + } + + in += 16; +} + + +#if 1 + //wait for digest ready + while (! hashs->controlr.DGRY) { + // this will not take long + } +#endif + + *((u32 *) out + 0) = hashs->D1R; + *((u32 *) out + 1) = hashs->D2R; + *((u32 *) out + 2) = hashs->D3R; + *((u32 *) out + 3) = hashs->D4R; + *((u32 *) out + 4) = hashs->D5R; + + /* reset the context after we finish with the hash */ + mctx->byte_count = 0; + memset(&mctx->hash[0], 0, sizeof(MD5_HASH_WORDS)); + memset(&mctx->block[0], 0, sizeof(MD5_BLOCK_WORDS)); + memset(&temp[0], 0, MD5_HMAC_DBN_TEMP_SIZE); + + CRTCL_SECT_END; + + + return 0; +} + +EXPORT_SYMBOL(md5_hmac_final); + +/* + * \brief MD5_HMAC function mappings +*/ + +static struct shash_alg ifxdeu_md5_hmac_alg = { + .digestsize = MD5_DIGEST_SIZE, + .init = md5_hmac_init, + .update = md5_hmac_update, + .final = md5_hmac_final, + .setkey = md5_hmac_setkey, + .descsize = sizeof(struct md5_hmac_ctx), + .base = { + .cra_name = "hmac(md5)", + .cra_driver_name= "ifxdeu-md5_hmac", + .cra_ctxsize = sizeof(struct md5_hmac_ctx), + .cra_flags = CRYPTO_ALG_TYPE_DIGEST, + .cra_blocksize = MD5_HMAC_BLOCK_SIZE, + .cra_module = THIS_MODULE, + } +}; + +/*! \fn int __init ifxdeu_init_md5_hmac (void) + * \ingroup IFX_MD5_HMAC_FUNCTIONS + * \brief initialize md5 hmac driver +*/ +int __init ifxdeu_init_md5_hmac (void) +{ + + int ret = -ENOSYS; + + + if ((ret = crypto_register_shash(&ifxdeu_md5_hmac_alg))) + goto md5_hmac_err; + + CRTCL_SECT_INIT; + + printk (KERN_NOTICE "IFX DEU MD5_HMAC initialized%s.\n", disable_deudma ? "" : " (DMA)"); + return ret; + +md5_hmac_err: + printk(KERN_ERR "IFX DEU MD5_HMAC initialization failed!\n"); + return ret; +} + +/** \fn void __exit ifxdeu_fini_md5_hmac (void) + * \ingroup IFX_MD5_HMAC_FUNCTIONS + * \brief unregister md5 hmac driver +*/ +void __exit ifxdeu_fini_md5_hmac (void) +{ + crypto_unregister_shash(&ifxdeu_md5_hmac_alg); +} + + |