diff options
Diffstat (limited to 'drivers/crypto/padlock-sha.c')
| -rw-r--r-- | drivers/crypto/padlock-sha.c | 318 |
1 files changed, 318 insertions, 0 deletions
diff --git a/drivers/crypto/padlock-sha.c b/drivers/crypto/padlock-sha.c new file mode 100644 index 000000000000..a781fd23b607 --- /dev/null +++ b/drivers/crypto/padlock-sha.c @@ -0,0 +1,318 @@ +/* + * Cryptographic API. + * + * Support for VIA PadLock hardware crypto engine. + * + * Copyright (c) 2006 Michal Ludvig <michal@logix.cz> + * + * 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 <crypto/algapi.h> +#include <linux/err.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/errno.h> +#include <linux/cryptohash.h> +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/scatterlist.h> +#include "padlock.h" + +#define SHA1_DEFAULT_FALLBACK "sha1-generic" +#define SHA1_DIGEST_SIZE 20 +#define SHA1_HMAC_BLOCK_SIZE 64 + +#define SHA256_DEFAULT_FALLBACK "sha256-generic" +#define SHA256_DIGEST_SIZE 32 +#define SHA256_HMAC_BLOCK_SIZE 64 + +struct padlock_sha_ctx { + char *data; + size_t used; + int bypass; + void (*f_sha_padlock)(const char *in, char *out, int count); + struct hash_desc fallback; +}; + +static inline struct padlock_sha_ctx *ctx(struct crypto_tfm *tfm) +{ + return crypto_tfm_ctx(tfm); +} + +/* We'll need aligned address on the stack */ +#define NEAREST_ALIGNED(ptr) \ + ((void *)ALIGN((size_t)(ptr), PADLOCK_ALIGNMENT)) + +static struct crypto_alg sha1_alg, sha256_alg; + +static void padlock_sha_bypass(struct crypto_tfm *tfm) +{ + if (ctx(tfm)->bypass) + return; + + crypto_hash_init(&ctx(tfm)->fallback); + if (ctx(tfm)->data && ctx(tfm)->used) { + struct scatterlist sg; + + sg_set_buf(&sg, ctx(tfm)->data, ctx(tfm)->used); + crypto_hash_update(&ctx(tfm)->fallback, &sg, sg.length); + } + + ctx(tfm)->used = 0; + ctx(tfm)->bypass = 1; +} + +static void padlock_sha_init(struct crypto_tfm *tfm) +{ + ctx(tfm)->used = 0; + ctx(tfm)->bypass = 0; +} + +static void padlock_sha_update(struct crypto_tfm *tfm, + const uint8_t *data, unsigned int length) +{ + /* Our buffer is always one page. */ + if (unlikely(!ctx(tfm)->bypass && + (ctx(tfm)->used + length > PAGE_SIZE))) + padlock_sha_bypass(tfm); + + if (unlikely(ctx(tfm)->bypass)) { + struct scatterlist sg; + sg_set_buf(&sg, (uint8_t *)data, length); + crypto_hash_update(&ctx(tfm)->fallback, &sg, length); + return; + } + + memcpy(ctx(tfm)->data + ctx(tfm)->used, data, length); + ctx(tfm)->used += length; +} + +static inline void padlock_output_block(uint32_t *src, + uint32_t *dst, size_t count) +{ + while (count--) + *dst++ = swab32(*src++); +} + +static void padlock_do_sha1(const char *in, char *out, int count) +{ + /* We can't store directly to *out as it may be unaligned. */ + /* BTW Don't reduce the buffer size below 128 Bytes! + * PadLock microcode needs it that big. */ + char buf[128+16]; + char *result = NEAREST_ALIGNED(buf); + + ((uint32_t *)result)[0] = 0x67452301; + ((uint32_t *)result)[1] = 0xEFCDAB89; + ((uint32_t *)result)[2] = 0x98BADCFE; + ((uint32_t *)result)[3] = 0x10325476; + ((uint32_t *)result)[4] = 0xC3D2E1F0; + + asm volatile (".byte 0xf3,0x0f,0xa6,0xc8" /* rep xsha1 */ + : "+S"(in), "+D"(result) + : "c"(count), "a"(0)); + + padlock_output_block((uint32_t *)result, (uint32_t *)out, 5); +} + +static void padlock_do_sha256(const char *in, char *out, int count) +{ + /* We can't store directly to *out as it may be unaligned. */ + /* BTW Don't reduce the buffer size below 128 Bytes! + * PadLock microcode needs it that big. */ + char buf[128+16]; + char *result = NEAREST_ALIGNED(buf); + + ((uint32_t *)result)[0] = 0x6A09E667; + ((uint32_t *)result)[1] = 0xBB67AE85; + ((uint32_t *)result)[2] = 0x3C6EF372; + ((uint32_t *)result)[3] = 0xA54FF53A; + ((uint32_t *)result)[4] = 0x510E527F; + ((uint32_t *)result)[5] = 0x9B05688C; + ((uint32_t *)result)[6] = 0x1F83D9AB; + ((uint32_t *)result)[7] = 0x5BE0CD19; + + asm volatile (".byte 0xf3,0x0f,0xa6,0xd0" /* rep xsha256 */ + : "+S"(in), "+D"(result) + : "c"(count), "a"(0)); + + padlock_output_block((uint32_t *)result, (uint32_t *)out, 8); +} + +static void padlock_sha_final(struct crypto_tfm *tfm, uint8_t *out) +{ + if (unlikely(ctx(tfm)->bypass)) { + crypto_hash_final(&ctx(tfm)->fallback, out); + ctx(tfm)->bypass = 0; + return; + } + + /* Pass the input buffer to PadLock microcode... */ + ctx(tfm)->f_sha_padlock(ctx(tfm)->data, out, ctx(tfm)->used); + + ctx(tfm)->used = 0; +} + +static int padlock_cra_init(struct crypto_tfm *tfm) +{ + const char *fallback_driver_name = tfm->__crt_alg->cra_name; + struct crypto_hash *fallback_tfm; + + /* For now we'll allocate one page. This + * could eventually be configurable one day. */ + ctx(tfm)->data = (char *)__get_free_page(GFP_KERNEL); + if (!ctx(tfm)->data) + return -ENOMEM; + + /* Allocate a fallback and abort if it failed. */ + fallback_tfm = crypto_alloc_hash(fallback_driver_name, 0, + CRYPTO_ALG_ASYNC | + CRYPTO_ALG_NEED_FALLBACK); + if (IS_ERR(fallback_tfm)) { + printk(KERN_WARNING PFX "Fallback driver '%s' could not be loaded!\n", + fallback_driver_name); + free_page((unsigned long)(ctx(tfm)->data)); + return PTR_ERR(fallback_tfm); + } + + ctx(tfm)->fallback.tfm = fallback_tfm; + return 0; +} + +static int padlock_sha1_cra_init(struct crypto_tfm *tfm) +{ + ctx(tfm)->f_sha_padlock = padlock_do_sha1; + + return padlock_cra_init(tfm); +} + +static int padlock_sha256_cra_init(struct crypto_tfm *tfm) +{ + ctx(tfm)->f_sha_padlock = padlock_do_sha256; + + return padlock_cra_init(tfm); +} + +static void padlock_cra_exit(struct crypto_tfm *tfm) +{ + if (ctx(tfm)->data) { + free_page((unsigned long)(ctx(tfm)->data)); + ctx(tfm)->data = NULL; + } + + crypto_free_hash(ctx(tfm)->fallback.tfm); + ctx(tfm)->fallback.tfm = NULL; +} + +static struct crypto_alg sha1_alg = { + .cra_name = "sha1", + .cra_driver_name = "sha1-padlock", + .cra_priority = PADLOCK_CRA_PRIORITY, + .cra_flags = CRYPTO_ALG_TYPE_DIGEST | + CRYPTO_ALG_NEED_FALLBACK, + .cra_blocksize = SHA1_HMAC_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct padlock_sha_ctx), + .cra_module = THIS_MODULE, + .cra_list = LIST_HEAD_INIT(sha1_alg.cra_list), + .cra_init = padlock_sha1_cra_init, + .cra_exit = padlock_cra_exit, + .cra_u = { + .digest = { + .dia_digestsize = SHA1_DIGEST_SIZE, + .dia_init = padlock_sha_init, + .dia_update = padlock_sha_update, + .dia_final = padlock_sha_final, + } + } +}; + +static struct crypto_alg sha256_alg = { + .cra_name = "sha256", + .cra_driver_name = "sha256-padlock", + .cra_priority = PADLOCK_CRA_PRIORITY, + .cra_flags = CRYPTO_ALG_TYPE_DIGEST | + CRYPTO_ALG_NEED_FALLBACK, + .cra_blocksize = SHA256_HMAC_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct padlock_sha_ctx), + .cra_module = THIS_MODULE, + .cra_list = LIST_HEAD_INIT(sha256_alg.cra_list), + .cra_init = padlock_sha256_cra_init, + .cra_exit = padlock_cra_exit, + .cra_u = { + .digest = { + .dia_digestsize = SHA256_DIGEST_SIZE, + .dia_init = padlock_sha_init, + .dia_update = padlock_sha_update, + .dia_final = padlock_sha_final, + } + } +}; + +static void __init padlock_sha_check_fallbacks(void) +{ + if (!crypto_has_hash("sha1", 0, CRYPTO_ALG_ASYNC | + CRYPTO_ALG_NEED_FALLBACK)) + printk(KERN_WARNING PFX + "Couldn't load fallback module for sha1.\n"); + + if (!crypto_has_hash("sha256", 0, CRYPTO_ALG_ASYNC | + CRYPTO_ALG_NEED_FALLBACK)) + printk(KERN_WARNING PFX + "Couldn't load fallback module for sha256.\n"); +} + +static int __init padlock_init(void) +{ + int rc = -ENODEV; + + if (!cpu_has_phe) { + printk(KERN_ERR PFX "VIA PadLock Hash Engine not detected.\n"); + return -ENODEV; + } + + if (!cpu_has_phe_enabled) { + printk(KERN_ERR PFX "VIA PadLock detected, but not enabled. Hmm, strange...\n"); + return -ENODEV; + } + + padlock_sha_check_fallbacks(); + + rc = crypto_register_alg(&sha1_alg); + if (rc) + goto out; + + rc = crypto_register_alg(&sha256_alg); + if (rc) + goto out_unreg1; + + printk(KERN_NOTICE PFX "Using VIA PadLock ACE for SHA1/SHA256 algorithms.\n"); + + return 0; + +out_unreg1: + crypto_unregister_alg(&sha1_alg); +out: + printk(KERN_ERR PFX "VIA PadLock SHA1/SHA256 initialization failed.\n"); + return rc; +} + +static void __exit padlock_fini(void) +{ + crypto_unregister_alg(&sha1_alg); + crypto_unregister_alg(&sha256_alg); +} + +module_init(padlock_init); +module_exit(padlock_fini); + +MODULE_DESCRIPTION("VIA PadLock SHA1/SHA256 algorithms support."); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Michal Ludvig"); + +MODULE_ALIAS("sha1-padlock"); +MODULE_ALIAS("sha256-padlock"); |