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authorLinus Torvalds <torvalds@linux-foundation.org>2008-10-10 14:20:42 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-10-10 14:20:42 -0400
commitf6bccf695431da0e9bd773550ae91b8cb9ffb227 (patch)
treeff81689bd9bf849b4827da6fbd69fce471842057 /arch
parent3af73d392c9c414ca527bab9c5d4c2a97698acbd (diff)
parenta0f000ec9b61b99111757df138b11144236fc59b (diff)
Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
* git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: crypto: skcipher - Use RNG interface instead of get_random_bytes crypto: rng - RNG interface and implementation crypto: api - Add fips_enable flag crypto: skcipher - Move IV generators into their own modules crypto: cryptomgr - Test ciphers using ECB crypto: api - Use test infrastructure crypto: cryptomgr - Add test infrastructure crypto: tcrypt - Add alg_test interface crypto: tcrypt - Abort and only log if there is an error crypto: crc32c - Use Intel CRC32 instruction crypto: tcrypt - Avoid using contiguous pages crypto: api - Display larval objects properly crypto: api - Export crypto_alg_lookup instead of __crypto_alg_lookup crypto: Kconfig - Replace leading spaces with tabs
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/crypto/Makefile2
-rw-r--r--arch/x86/crypto/crc32c-intel.c197
2 files changed, 199 insertions, 0 deletions
diff --git a/arch/x86/crypto/Makefile b/arch/x86/crypto/Makefile
index 3874c2de5403..903de4aa5094 100644
--- a/arch/x86/crypto/Makefile
+++ b/arch/x86/crypto/Makefile
@@ -10,6 +10,8 @@ obj-$(CONFIG_CRYPTO_AES_X86_64) += aes-x86_64.o
10obj-$(CONFIG_CRYPTO_TWOFISH_X86_64) += twofish-x86_64.o 10obj-$(CONFIG_CRYPTO_TWOFISH_X86_64) += twofish-x86_64.o
11obj-$(CONFIG_CRYPTO_SALSA20_X86_64) += salsa20-x86_64.o 11obj-$(CONFIG_CRYPTO_SALSA20_X86_64) += salsa20-x86_64.o
12 12
13obj-$(CONFIG_CRYPTO_CRC32C_INTEL) += crc32c-intel.o
14
13aes-i586-y := aes-i586-asm_32.o aes_glue.o 15aes-i586-y := aes-i586-asm_32.o aes_glue.o
14twofish-i586-y := twofish-i586-asm_32.o twofish_glue.o 16twofish-i586-y := twofish-i586-asm_32.o twofish_glue.o
15salsa20-i586-y := salsa20-i586-asm_32.o salsa20_glue.o 17salsa20-i586-y := salsa20-i586-asm_32.o salsa20_glue.o
diff --git a/arch/x86/crypto/crc32c-intel.c b/arch/x86/crypto/crc32c-intel.c
new file mode 100644
index 000000000000..070afc5b6c94
--- /dev/null
+++ b/arch/x86/crypto/crc32c-intel.c
@@ -0,0 +1,197 @@
1/*
2 * Using hardware provided CRC32 instruction to accelerate the CRC32 disposal.
3 * CRC32C polynomial:0x1EDC6F41(BE)/0x82F63B78(LE)
4 * CRC32 is a new instruction in Intel SSE4.2, the reference can be found at:
5 * http://www.intel.com/products/processor/manuals/
6 * Intel(R) 64 and IA-32 Architectures Software Developer's Manual
7 * Volume 2A: Instruction Set Reference, A-M
8 *
9 * Copyright (c) 2008 Austin Zhang <austin_zhang@linux.intel.com>
10 * Copyright (c) 2008 Kent Liu <kent.liu@intel.com>
11 *
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License as published by the Free
14 * Software Foundation; either version 2 of the License, or (at your option)
15 * any later version.
16 *
17 */
18#include <linux/init.h>
19#include <linux/module.h>
20#include <linux/string.h>
21#include <linux/kernel.h>
22#include <crypto/internal/hash.h>
23
24#include <asm/cpufeature.h>
25
26#define CHKSUM_BLOCK_SIZE 1
27#define CHKSUM_DIGEST_SIZE 4
28
29#define SCALE_F sizeof(unsigned long)
30
31#ifdef CONFIG_X86_64
32#define REX_PRE "0x48, "
33#else
34#define REX_PRE
35#endif
36
37static u32 crc32c_intel_le_hw_byte(u32 crc, unsigned char const *data, size_t length)
38{
39 while (length--) {
40 __asm__ __volatile__(
41 ".byte 0xf2, 0xf, 0x38, 0xf0, 0xf1"
42 :"=S"(crc)
43 :"0"(crc), "c"(*data)
44 );
45 data++;
46 }
47
48 return crc;
49}
50
51static u32 __pure crc32c_intel_le_hw(u32 crc, unsigned char const *p, size_t len)
52{
53 unsigned int iquotient = len / SCALE_F;
54 unsigned int iremainder = len % SCALE_F;
55 unsigned long *ptmp = (unsigned long *)p;
56
57 while (iquotient--) {
58 __asm__ __volatile__(
59 ".byte 0xf2, " REX_PRE "0xf, 0x38, 0xf1, 0xf1;"
60 :"=S"(crc)
61 :"0"(crc), "c"(*ptmp)
62 );
63 ptmp++;
64 }
65
66 if (iremainder)
67 crc = crc32c_intel_le_hw_byte(crc, (unsigned char *)ptmp,
68 iremainder);
69
70 return crc;
71}
72
73/*
74 * Setting the seed allows arbitrary accumulators and flexible XOR policy
75 * If your algorithm starts with ~0, then XOR with ~0 before you set
76 * the seed.
77 */
78static int crc32c_intel_setkey(struct crypto_ahash *hash, const u8 *key,
79 unsigned int keylen)
80{
81 u32 *mctx = crypto_ahash_ctx(hash);
82
83 if (keylen != sizeof(u32)) {
84 crypto_ahash_set_flags(hash, CRYPTO_TFM_RES_BAD_KEY_LEN);
85 return -EINVAL;
86 }
87 *mctx = le32_to_cpup((__le32 *)key);
88 return 0;
89}
90
91static int crc32c_intel_init(struct ahash_request *req)
92{
93 u32 *mctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
94 u32 *crcp = ahash_request_ctx(req);
95
96 *crcp = *mctx;
97
98 return 0;
99}
100
101static int crc32c_intel_update(struct ahash_request *req)
102{
103 struct crypto_hash_walk walk;
104 u32 *crcp = ahash_request_ctx(req);
105 u32 crc = *crcp;
106 int nbytes;
107
108 for (nbytes = crypto_hash_walk_first(req, &walk); nbytes;
109 nbytes = crypto_hash_walk_done(&walk, 0))
110 crc = crc32c_intel_le_hw(crc, walk.data, nbytes);
111
112 *crcp = crc;
113 return 0;
114}
115
116static int crc32c_intel_final(struct ahash_request *req)
117{
118 u32 *crcp = ahash_request_ctx(req);
119
120 *(__le32 *)req->result = ~cpu_to_le32p(crcp);
121 return 0;
122}
123
124static int crc32c_intel_digest(struct ahash_request *req)
125{
126 struct crypto_hash_walk walk;
127 u32 *mctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
128 u32 crc = *mctx;
129 int nbytes;
130
131 for (nbytes = crypto_hash_walk_first(req, &walk); nbytes;
132 nbytes = crypto_hash_walk_done(&walk, 0))
133 crc = crc32c_intel_le_hw(crc, walk.data, nbytes);
134
135 *(__le32 *)req->result = ~cpu_to_le32(crc);
136 return 0;
137}
138
139static int crc32c_intel_cra_init(struct crypto_tfm *tfm)
140{
141 u32 *key = crypto_tfm_ctx(tfm);
142
143 *key = ~0;
144
145 tfm->crt_ahash.reqsize = sizeof(u32);
146
147 return 0;
148}
149
150static struct crypto_alg alg = {
151 .cra_name = "crc32c",
152 .cra_driver_name = "crc32c-intel",
153 .cra_priority = 200,
154 .cra_flags = CRYPTO_ALG_TYPE_AHASH,
155 .cra_blocksize = CHKSUM_BLOCK_SIZE,
156 .cra_alignmask = 3,
157 .cra_ctxsize = sizeof(u32),
158 .cra_module = THIS_MODULE,
159 .cra_list = LIST_HEAD_INIT(alg.cra_list),
160 .cra_init = crc32c_intel_cra_init,
161 .cra_type = &crypto_ahash_type,
162 .cra_u = {
163 .ahash = {
164 .digestsize = CHKSUM_DIGEST_SIZE,
165 .setkey = crc32c_intel_setkey,
166 .init = crc32c_intel_init,
167 .update = crc32c_intel_update,
168 .final = crc32c_intel_final,
169 .digest = crc32c_intel_digest,
170 }
171 }
172};
173
174
175static int __init crc32c_intel_mod_init(void)
176{
177 if (cpu_has_xmm4_2)
178 return crypto_register_alg(&alg);
179 else
180 return -ENODEV;
181}
182
183static void __exit crc32c_intel_mod_fini(void)
184{
185 crypto_unregister_alg(&alg);
186}
187
188module_init(crc32c_intel_mod_init);
189module_exit(crc32c_intel_mod_fini);
190
191MODULE_AUTHOR("Austin Zhang <austin.zhang@intel.com>, Kent Liu <kent.liu@intel.com>");
192MODULE_DESCRIPTION("CRC32c (Castagnoli) optimization using Intel Hardware.");
193MODULE_LICENSE("GPL");
194
195MODULE_ALIAS("crc32c");
196MODULE_ALIAS("crc32c-intel");
197