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Diffstat (limited to 'package/kernel/lantiq/ltq-deu/src/ifxmips_arc4.c')
| -rw-r--r-- | package/kernel/lantiq/ltq-deu/src/ifxmips_arc4.c | 389 |
1 files changed, 389 insertions, 0 deletions
diff --git a/package/kernel/lantiq/ltq-deu/src/ifxmips_arc4.c b/package/kernel/lantiq/ltq-deu/src/ifxmips_arc4.c new file mode 100644 index 0000000..ee56187 --- /dev/null +++ b/package/kernel/lantiq/ltq-deu/src/ifxmips_arc4.c @@ -0,0 +1,389 @@ +/****************************************************************************** +** +** FILE NAME : ifxmips_arc4.c +** PROJECT : IFX UEIP +** MODULES : DEU Module +** +** DATE : September 8, 2009 +** AUTHOR : Mohammad Firdaus +** DESCRIPTION : Data Encryption Unit Driver for ARC4 Algorithm +** 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 +*******************************************************************************/ + +/*! + \defgroup IFX_DEU IFX_DEU_DRIVERS + \ingroup API + \brief ifx deu driver module +*/ + +/*! + \file ifxmips_arc4.c + \ingroup IFX_DEU + \brief ARC4 encryption DEU driver file +*/ + +/*! + \defgroup IFX_ARC4_FUNCTIONS IFX_ARC4_FUNCTIONS + \ingroup IFX_DEU + \brief IFX deu driver functions +*/ + +/* Project header */ +#include <linux/version.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/types.h> +#include <linux/errno.h> +#include <linux/crypto.h> +#include <crypto/algapi.h> +#include <linux/interrupt.h> +#include <asm/byteorder.h> +#include <linux/delay.h> + +/* Board specific header files */ +#ifdef CONFIG_AR9 +#include "ifxmips_deu_ar9.h" +#endif +#ifdef CONFIG_VR9 +#include "ifxmips_deu_vr9.h" +#endif + +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) + +/* Preprocessor declerations */ +#define ARC4_MIN_KEY_SIZE 1 +//#define ARC4_MAX_KEY_SIZE 256 +#define ARC4_MAX_KEY_SIZE 16 +#define ARC4_BLOCK_SIZE 1 +#define ARC4_START IFX_ARC4_CON +#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 + +/* + * \brief arc4 private structure +*/ +struct arc4_ctx { + int key_length; + u8 buf[120]; +}; + +extern int disable_deudma; +extern int disable_multiblock; + + +/*! \fn static void _deu_arc4 (void *ctx_arg, u8 *out_arg, const u8 *in_arg, u8 *iv_arg, u32 nbytes, int encdec, int mode) + \ingroup IFX_ARC4_FUNCTIONS + \brief main interface to ARC4 hardware + \param ctx_arg crypto algo context + \param out_arg output bytestream + \param in_arg input bytestream + \param iv_arg initialization vector + \param nbytes length of bytestream + \param encdec 1 for encrypt; 0 for decrypt + \param mode operation mode such as ebc, cbc, ctr +*/ +static void _deu_arc4 (void *ctx_arg, u8 *out_arg, const u8 *in_arg, + u8 *iv_arg, u32 nbytes, int encdec, int mode) +{ + volatile struct arc4_t *arc4 = (struct arc4_t *) ARC4_START; + + int i = 0; + unsigned long flag; + +#if 1 // need to handle nbytes not multiple of 16 + volatile u32 tmp_array32[4]; + volatile u8 *tmp_ptr8; + int remaining_bytes, j; +#endif + + CRTCL_SECT_START; + + arc4->IDLEN = nbytes; + +#if 1 + while (i < nbytes) { + arc4->ID3R = *((u32 *) in_arg + (i>>2) + 0); + arc4->ID2R = *((u32 *) in_arg + (i>>2) + 1); + arc4->ID1R = *((u32 *) in_arg + (i>>2) + 2); + arc4->ID0R = *((u32 *) in_arg + (i>>2) + 3); + + arc4->controlr.GO = 1; + + while (arc4->controlr.BUS) { + // this will not take long + } + +#if 1 + // need to handle nbytes not multiple of 16 + tmp_array32[0] = arc4->OD3R; + tmp_array32[1] = arc4->OD2R; + tmp_array32[2] = arc4->OD1R; + tmp_array32[3] = arc4->OD0R; + + remaining_bytes = nbytes - i; + if (remaining_bytes > 16) + remaining_bytes = 16; + + tmp_ptr8 = (u8 *)&tmp_array32[0]; + for (j = 0; j < remaining_bytes; j++) + *out_arg++ = *tmp_ptr8++; +#else + *((u32 *) out_arg + (i>>2) + 0) = arc4->OD3R; + *((u32 *) out_arg + (i>>2) + 1) = arc4->OD2R; + *((u32 *) out_arg + (i>>2) + 2) = arc4->OD1R; + *((u32 *) out_arg + (i>>2) + 3) = arc4->OD0R; +#endif + + i += 16; + } +#else // dma + +#endif // dma + + CRTCL_SECT_END; +} + +/*! \fn arc4_chip_init (void) + \ingroup IFX_ARC4_FUNCTIONS + \brief initialize arc4 hardware +*/ +static void arc4_chip_init (void) +{ + //do nothing +} + +/*! \fn static int arc4_set_key(struct crypto_tfm *tfm, const u8 *in_key, unsigned int key_len) + \ingroup IFX_ARC4_FUNCTIONS + \brief sets ARC4 key + \param tfm linux crypto algo transform + \param in_key input key + \param key_len key lengths less than or equal to 16 bytes supported +*/ +static int arc4_set_key(struct crypto_tfm *tfm, const u8 *inkey, + unsigned int key_len) +{ + //struct arc4_ctx *ctx = crypto_tfm_ctx(tfm); + volatile struct arc4_t *arc4 = (struct arc4_t *) ARC4_START; + u32 *in_key = (u32 *)inkey; + + // must program all bits at one go?!!! +//#if 1 + *IFX_ARC4_CON = ( (1<<31) | ((key_len - 1)<<27) | (1<<26) | (3<<16) ); + //NDC=1,ENDI=1,GO=0,KSAE=1,SM=0 + + arc4->K3R = *((u32 *) in_key + 0); + arc4->K2R = *((u32 *) in_key + 1); + arc4->K1R = *((u32 *) in_key + 2); + arc4->K0R = *((u32 *) in_key + 3); + +#if 0 // arc4 is a ugly state machine, KSAE can only be set once per session + ctx->key_length = key_len; + + memcpy ((u8 *) (ctx->buf), in_key, key_len); +#endif + + return 0; +} + +/*! \fn static void _deu_arc4_ecb(void *ctx, uint8_t *dst, const uint8_t *src, uint8_t *iv, size_t nbytes, int encdec, int inplace) + \ingroup IFX_ARC4_FUNCTIONS + \brief sets ARC4 hardware to ECB mode + \param ctx crypto algo context + \param dst output bytestream + \param src input bytestream + \param iv initialization vector + \param nbytes length of bytestream + \param encdec 1 for encrypt; 0 for decrypt + \param inplace not used +*/ +static void _deu_arc4_ecb(void *ctx, uint8_t *dst, const uint8_t *src, + uint8_t *iv, size_t nbytes, int encdec, int inplace) +{ + _deu_arc4 (ctx, dst, src, NULL, nbytes, encdec, 0); +} + +/*! \fn static void arc4_crypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) + \ingroup IFX_ARC4_FUNCTIONS + \brief encrypt/decrypt ARC4_BLOCK_SIZE of data + \param tfm linux crypto algo transform + \param out output bytestream + \param in input bytestream +*/ +static void arc4_crypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) +{ + struct arc4_ctx *ctx = crypto_tfm_ctx(tfm); + + _deu_arc4 (ctx, out, in, NULL, ARC4_BLOCK_SIZE, + CRYPTO_DIR_DECRYPT, 0); + +} + +/* + * \brief ARC4 function mappings +*/ +static struct crypto_alg ifxdeu_arc4_alg = { + .cra_name = "arc4", + .cra_driver_name = "ifxdeu-arc4", + .cra_flags = CRYPTO_ALG_TYPE_CIPHER, + .cra_blocksize = ARC4_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct arc4_ctx), + .cra_module = THIS_MODULE, + .cra_list = LIST_HEAD_INIT(ifxdeu_arc4_alg.cra_list), + .cra_u = { + .cipher = { + .cia_min_keysize = ARC4_MIN_KEY_SIZE, + .cia_max_keysize = ARC4_MAX_KEY_SIZE, + .cia_setkey = arc4_set_key, + .cia_encrypt = arc4_crypt, + .cia_decrypt = arc4_crypt, + } + } +}; + +/*! \fn static int ecb_arc4_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst, struct scatterlist *src, unsigned int nbytes) + \ingroup IFX_ARC4_FUNCTIONS + \brief ECB ARC4 encrypt using linux crypto blkcipher + \param desc blkcipher descriptor + \param dst output scatterlist + \param src input scatterlist + \param nbytes data size in bytes +*/ +static int ecb_arc4_encrypt(struct blkcipher_desc *desc, + struct scatterlist *dst, struct scatterlist *src, + unsigned int nbytes) +{ + struct arc4_ctx *ctx = crypto_blkcipher_ctx(desc->tfm); + struct blkcipher_walk walk; + int err; + + DPRINTF(1, "\n"); + blkcipher_walk_init(&walk, dst, src, nbytes); + err = blkcipher_walk_virt(desc, &walk); + + while ((nbytes = walk.nbytes)) { + _deu_arc4_ecb(ctx, walk.dst.virt.addr, walk.src.virt.addr, + NULL, nbytes, CRYPTO_DIR_ENCRYPT, 0); + nbytes &= ARC4_BLOCK_SIZE - 1; + err = blkcipher_walk_done(desc, &walk, nbytes); + } + + return err; +} + +/*! \fn static int ecb_arc4_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst, struct scatterlist *src, unsigned int nbytes) + \ingroup IFX_ARC4_FUNCTIONS + \brief ECB ARC4 decrypt using linux crypto blkcipher + \param desc blkcipher descriptor + \param dst output scatterlist + \param src input scatterlist + \param nbytes data size in bytes +*/ +static int ecb_arc4_decrypt(struct blkcipher_desc *desc, + struct scatterlist *dst, struct scatterlist *src, + unsigned int nbytes) +{ + struct arc4_ctx *ctx = crypto_blkcipher_ctx(desc->tfm); + struct blkcipher_walk walk; + int err; + + DPRINTF(1, "\n"); + blkcipher_walk_init(&walk, dst, src, nbytes); + err = blkcipher_walk_virt(desc, &walk); + + while ((nbytes = walk.nbytes)) { + _deu_arc4_ecb(ctx, walk.dst.virt.addr, walk.src.virt.addr, + NULL, nbytes, CRYPTO_DIR_DECRYPT, 0); + nbytes &= ARC4_BLOCK_SIZE - 1; + err = blkcipher_walk_done(desc, &walk, nbytes); + } + + return err; +} + +/* + * \brief ARC4 function mappings +*/ +static struct crypto_alg ifxdeu_ecb_arc4_alg = { + .cra_name = "ecb(arc4)", + .cra_driver_name = "ifxdeu-ecb(arc4)", + .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, + .cra_blocksize = ARC4_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct arc4_ctx), + .cra_type = &crypto_blkcipher_type, + .cra_module = THIS_MODULE, + .cra_list = LIST_HEAD_INIT(ifxdeu_ecb_arc4_alg.cra_list), + .cra_u = { + .blkcipher = { + .min_keysize = ARC4_MIN_KEY_SIZE, + .max_keysize = ARC4_MAX_KEY_SIZE, + .setkey = arc4_set_key, + .encrypt = ecb_arc4_encrypt, + .decrypt = ecb_arc4_decrypt, + } + } +}; + +/*! \fn int __init ifxdeu_init_arc4(void) + \ingroup IFX_ARC4_FUNCTIONS + \brief initialize arc4 driver +*/ +int __init ifxdeu_init_arc4(void) +{ + int ret = -ENOSYS; + + + if ((ret = crypto_register_alg(&ifxdeu_arc4_alg))) + goto arc4_err; + + if ((ret = crypto_register_alg(&ifxdeu_ecb_arc4_alg))) + goto ecb_arc4_err; + + arc4_chip_init (); + + CRTCL_SECT_INIT; + + printk (KERN_NOTICE "IFX DEU ARC4 initialized%s%s.\n", disable_multiblock ? "" : " (multiblock)", disable_deudma ? "" : " (DMA)"); + return ret; + +arc4_err: + crypto_unregister_alg(&ifxdeu_arc4_alg); + printk(KERN_ERR "IFX arc4 initialization failed!\n"); + return ret; +ecb_arc4_err: + crypto_unregister_alg(&ifxdeu_ecb_arc4_alg); + printk (KERN_ERR "IFX ecb_arc4 initialization failed!\n"); + return ret; + +} + +/*! \fn void __exit ifxdeu_fini_arc4(void) + \ingroup IFX_ARC4_FUNCTIONS + \brief unregister arc4 driver +*/ +void __exit ifxdeu_fini_arc4(void) +{ + crypto_unregister_alg (&ifxdeu_arc4_alg); + crypto_unregister_alg (&ifxdeu_ecb_arc4_alg); + + +} + + |