[linux.git] / arch / sparc / crypto / sha256_glue.c

/* Glue code for SHA256 hashing optimized for sparc64 crypto opcodes.
 *
 * This is based largely upon crypto/sha256_generic.c
 *
 * Copyright (c) Jean-Luc Cooke <[email protected]>
 * Copyright (c) Andrew McDonald <[email protected]>
 * Copyright (c) 2002 James Morris <[email protected]>
 * SHA224 Support Copyright 2007 Intel Corporation <[email protected]>
 */

#define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt

#include <crypto/internal/hash.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/cryptohash.h>
#include <linux/types.h>
#include <crypto/sha.h>

#include <asm/pstate.h>
#include <asm/elf.h>

asmlinkage void sha256_sparc64_transform(u32 *digest, const char *data,
					 unsigned int rounds);

static int sha224_sparc64_init(struct shash_desc *desc)
{
	struct sha256_state *sctx = shash_desc_ctx(desc);
	sctx->state[0] = SHA224_H0;
	sctx->state[1] = SHA224_H1;
	sctx->state[2] = SHA224_H2;
	sctx->state[3] = SHA224_H3;
	sctx->state[4] = SHA224_H4;
	sctx->state[5] = SHA224_H5;
	sctx->state[6] = SHA224_H6;
	sctx->state[7] = SHA224_H7;
	sctx->count = 0;

	return 0;
}

static int sha256_sparc64_init(struct shash_desc *desc)
{
	struct sha256_state *sctx = shash_desc_ctx(desc);
	sctx->state[0] = SHA256_H0;
	sctx->state[1] = SHA256_H1;
	sctx->state[2] = SHA256_H2;
	sctx->state[3] = SHA256_H3;
	sctx->state[4] = SHA256_H4;
	sctx->state[5] = SHA256_H5;
	sctx->state[6] = SHA256_H6;
	sctx->state[7] = SHA256_H7;
	sctx->count = 0;

	return 0;
}

static void __sha256_sparc64_update(struct sha256_state *sctx, const u8 *data,
				    unsigned int len, unsigned int partial)
{
	unsigned int done = 0;

	sctx->count += len;
	if (partial) {
		done = SHA256_BLOCK_SIZE - partial;
		memcpy(sctx->buf + partial, data, done);
		sha256_sparc64_transform(sctx->state, sctx->buf, 1);
	}
	if (len - done >= SHA256_BLOCK_SIZE) {
		const unsigned int rounds = (len - done) / SHA256_BLOCK_SIZE;

		sha256_sparc64_transform(sctx->state, data + done, rounds);
		done += rounds * SHA256_BLOCK_SIZE;
	}

	memcpy(sctx->buf, data + done, len - done);
}

static int sha256_sparc64_update(struct shash_desc *desc, const u8 *data,
				 unsigned int len)
{
	struct sha256_state *sctx = shash_desc_ctx(desc);
	unsigned int partial = sctx->count % SHA256_BLOCK_SIZE;

	/* Handle the fast case right here */
	if (partial + len < SHA256_BLOCK_SIZE) {
		sctx->count += len;
		memcpy(sctx->buf + partial, data, len);
	} else
		__sha256_sparc64_update(sctx, data, len, partial);

	return 0;
}

static int sha256_sparc64_final(struct shash_desc *desc, u8 *out)
{
	struct sha256_state *sctx = shash_desc_ctx(desc);
	unsigned int i, index, padlen;
	__be32 *dst = (__be32 *)out;
	__be64 bits;
	static const u8 padding[SHA256_BLOCK_SIZE] = { 0x80, };

	bits = cpu_to_be64(sctx->count << 3);

	/* Pad out to 56 mod 64 and append length */
	index = sctx->count % SHA256_BLOCK_SIZE;
	padlen = (index < 56) ? (56 - index) : ((SHA256_BLOCK_SIZE+56) - index);

	/* We need to fill a whole block for __sha256_sparc64_update() */
	if (padlen <= 56) {
		sctx->count += padlen;
		memcpy(sctx->buf + index, padding, padlen);
	} else {
		__sha256_sparc64_update(sctx, padding, padlen, index);
	}
	__sha256_sparc64_update(sctx, (const u8 *)&bits, sizeof(bits), 56);

	/* Store state in digest */
	for (i = 0; i < 8; i++)
		dst[i] = cpu_to_be32(sctx->state[i]);

	/* Wipe context */
	memset(sctx, 0, sizeof(*sctx));

	return 0;
}

static int sha224_sparc64_final(struct shash_desc *desc, u8 *hash)
{
	u8 D[SHA256_DIGEST_SIZE];

	sha256_sparc64_final(desc, D);

	memcpy(hash, D, SHA224_DIGEST_SIZE);
	memset(D, 0, SHA256_DIGEST_SIZE);

	return 0;
}

static int sha256_sparc64_export(struct shash_desc *desc, void *out)
{
	struct sha256_state *sctx = shash_desc_ctx(desc);

	memcpy(out, sctx, sizeof(*sctx));
	return 0;
}

static int sha256_sparc64_import(struct shash_desc *desc, const void *in)
{
	struct sha256_state *sctx = shash_desc_ctx(desc);

	memcpy(sctx, in, sizeof(*sctx));
	return 0;
}

static struct shash_alg sha256 = {
	.digestsize	=	SHA256_DIGEST_SIZE,
	.init		=	sha256_sparc64_init,
	.update		=	sha256_sparc64_update,
	.final		=	sha256_sparc64_final,
	.export		=	sha256_sparc64_export,
	.import		=	sha256_sparc64_import,
	.descsize	=	sizeof(struct sha256_state),
	.statesize	=	sizeof(struct sha256_state),
	.base		=	{
		.cra_name	=	"sha256",
		.cra_driver_name=	"sha256-sparc64",
		.cra_flags	=	CRYPTO_ALG_TYPE_SHASH,
		.cra_blocksize	=	SHA256_BLOCK_SIZE,
		.cra_module	=	THIS_MODULE,
	}
};

static struct shash_alg sha224 = {
	.digestsize	=	SHA224_DIGEST_SIZE,
	.init		=	sha224_sparc64_init,
	.update		=	sha256_sparc64_update,
	.final		=	sha224_sparc64_final,
	.descsize	=	sizeof(struct sha256_state),
	.base		=	{
		.cra_name	=	"sha224",
		.cra_driver_name=	"sha224-sparc64",
		.cra_flags	=	CRYPTO_ALG_TYPE_SHASH,
		.cra_blocksize	=	SHA224_BLOCK_SIZE,
		.cra_module	=	THIS_MODULE,
	}
};

static bool __init sparc64_has_sha256_opcode(void)
{
	unsigned long cfr;

	if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
		return false;

	__asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
	if (!(cfr & CFR_SHA256))
		return false;

	return true;
}

static int __init sha256_sparc64_mod_init(void)
{
	if (sparc64_has_sha256_opcode()) {
		int ret = crypto_register_shash(&sha224);
		if (ret < 0)
			return ret;

		ret = crypto_register_shash(&sha256);
		if (ret < 0) {
			crypto_unregister_shash(&sha224);
			return ret;
		}

		pr_info("Using sparc64 sha256 opcode optimized SHA-256/SHA-224 implementation\n");
		return 0;
	}
	pr_info("sparc64 sha256 opcode not available.\n");
	return -ENODEV;
}

static void __exit sha256_sparc64_mod_fini(void)
{
	crypto_unregister_shash(&sha224);
	crypto_unregister_shash(&sha256);
}

module_init(sha256_sparc64_mod_init);
module_exit(sha256_sparc64_mod_fini);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm, sparc64 sha256 opcode accelerated");

MODULE_ALIAS("sha224");
MODULE_ALIAS("sha256");
Commit	Line	Data
86c93b24 DM	1	/* Glue code for SHA256 hashing optimized for sparc64 crypto opcodes.
	2	*
	3	* This is based largely upon crypto/sha256_generic.c
	4	*
	5	* Copyright (c) Jean-Luc Cooke <[email protected]>
	6	* Copyright (c) Andrew McDonald <[email protected]>
	7	* Copyright (c) 2002 James Morris <[email protected]>
	8	* SHA224 Support Copyright 2007 Intel Corporation <[email protected]>
	9	*/
	10
	11	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
	12
	13	#include <crypto/internal/hash.h>
	14	#include <linux/init.h>
	15	#include <linux/module.h>
	16	#include <linux/mm.h>
	17	#include <linux/cryptohash.h>
	18	#include <linux/types.h>
	19	#include <crypto/sha.h>
	20
	21	#include <asm/pstate.h>
	22	#include <asm/elf.h>
	23
	24	asmlinkage void sha256_sparc64_transform(u32 digest, const char data,
	25	unsigned int rounds);
	26
	27	static int sha224_sparc64_init(struct shash_desc *desc)
	28	{
	29	struct sha256_state *sctx = shash_desc_ctx(desc);
	30	sctx->state[0] = SHA224_H0;
	31	sctx->state[1] = SHA224_H1;
	32	sctx->state[2] = SHA224_H2;
	33	sctx->state[3] = SHA224_H3;
	34	sctx->state[4] = SHA224_H4;
	35	sctx->state[5] = SHA224_H5;
	36	sctx->state[6] = SHA224_H6;
	37	sctx->state[7] = SHA224_H7;
	38	sctx->count = 0;
	39
	40	return 0;
	41	}
	42
	43	static int sha256_sparc64_init(struct shash_desc *desc)
	44	{
	45	struct sha256_state *sctx = shash_desc_ctx(desc);
	46	sctx->state[0] = SHA256_H0;
	47	sctx->state[1] = SHA256_H1;
	48	sctx->state[2] = SHA256_H2;
	49	sctx->state[3] = SHA256_H3;
	50	sctx->state[4] = SHA256_H4;
	51	sctx->state[5] = SHA256_H5;
	52	sctx->state[6] = SHA256_H6;
	53	sctx->state[7] = SHA256_H7;
	54	sctx->count = 0;
	55
	56	return 0;
	57	}
	58
	59	static void __sha256_sparc64_update(struct sha256_state sctx, const u8 data,
	60	unsigned int len, unsigned int partial)
	61	{
	62	unsigned int done = 0;
	63
	64	sctx->count += len;
65	if (partial) {
66	done = SHA256_BLOCK_SIZE - partial;
67	memcpy(sctx->buf + partial, data, done);
68	sha256_sparc64_transform(sctx->state, sctx->buf, 1);
69	}
70	if (len - done >= SHA256_BLOCK_SIZE) {
71	const unsigned int rounds = (len - done) / SHA256_BLOCK_SIZE;
72
73	sha256_sparc64_transform(sctx->state, data + done, rounds);
74	done += rounds * SHA256_BLOCK_SIZE;
75	}
76
77	memcpy(sctx->buf, data + done, len - done);
78	}
79
80	static int sha256_sparc64_update(struct shash_desc desc, const u8 data,
81	unsigned int len)
82	{
83	struct sha256_state *sctx = shash_desc_ctx(desc);
84	unsigned int partial = sctx->count % SHA256_BLOCK_SIZE;
85
86	/* Handle the fast case right here */
87	if (partial + len < SHA256_BLOCK_SIZE) {
88	sctx->count += len;
89	memcpy(sctx->buf + partial, data, len);
90	} else
91	__sha256_sparc64_update(sctx, data, len, partial);
92
93	return 0;
94	}
95
96	static int sha256_sparc64_final(struct shash_desc desc, u8 out)
97	{
98	struct sha256_state *sctx = shash_desc_ctx(desc);
99	unsigned int i, index, padlen;
100	__be32 dst = (__be32 )out;
101	__be64 bits;
102	static const u8 padding[SHA256_BLOCK_SIZE] = { 0x80, };
103
104	bits = cpu_to_be64(sctx->count << 3);
105
106	/* Pad out to 56 mod 64 and append length */
107	index = sctx->count % SHA256_BLOCK_SIZE;
108	padlen = (index < 56) ? (56 - index) : ((SHA256_BLOCK_SIZE+56) - index);
109
110	/* We need to fill a whole block for __sha256_sparc64_update() */
111	if (padlen <= 56) {
112	sctx->count += padlen;
113	memcpy(sctx->buf + index, padding, padlen);
114	} else {
115	__sha256_sparc64_update(sctx, padding, padlen, index);
116	}
117	__sha256_sparc64_update(sctx, (const u8 *)&bits, sizeof(bits), 56);
118
119	/* Store state in digest */
120	for (i = 0; i < 8; i++)
121	dst[i] = cpu_to_be32(sctx->state[i]);
122
123	/* Wipe context */
124	memset(sctx, 0, sizeof(*sctx));
125
126	return 0;
127	}
128
129	static int sha224_sparc64_final(struct shash_desc desc, u8 hash)
130	{
131	u8 D[SHA256_DIGEST_SIZE];
132
133	sha256_sparc64_final(desc, D);
134
135	memcpy(hash, D, SHA224_DIGEST_SIZE);
136	memset(D, 0, SHA256_DIGEST_SIZE);
137
138	return 0;
139	}
140
141	static int sha256_sparc64_export(struct shash_desc desc, void out)
142	{
143	struct sha256_state *sctx = shash_desc_ctx(desc);
144
145	memcpy(out, sctx, sizeof(*sctx));
146	return 0;
147	}
148
149	static int sha256_sparc64_import(struct shash_desc desc, const void in)
150	{
151	struct sha256_state *sctx = shash_desc_ctx(desc);
152
153	memcpy(sctx, in, sizeof(*sctx));
154	return 0;
155	}
156
157	static struct shash_alg sha256 = {
158	.digestsize = SHA256_DIGEST_SIZE,
159	.init = sha256_sparc64_init,
160	.update = sha256_sparc64_update,
161	.final = sha256_sparc64_final,
162	.export = sha256_sparc64_export,
163	.import = sha256_sparc64_import,
164	.descsize = sizeof(struct sha256_state),
165	.statesize = sizeof(struct sha256_state),
166	.base = {
167	.cra_name = "sha256",
168	.cra_driver_name= "sha256-sparc64",
169	.cra_flags = CRYPTO_ALG_TYPE_SHASH,
170	.cra_blocksize = SHA256_BLOCK_SIZE,
171	.cra_module = THIS_MODULE,
172	}
173	};
174
175	static struct shash_alg sha224 = {
176	.digestsize = SHA224_DIGEST_SIZE,
177	.init = sha224_sparc64_init,
178	.update = sha256_sparc64_update,
179	.final = sha224_sparc64_final,
180	.descsize = sizeof(struct sha256_state),
181	.base = {
182	.cra_name = "sha224",
183	.cra_driver_name= "sha224-sparc64",
184	.cra_flags = CRYPTO_ALG_TYPE_SHASH,
185	.cra_blocksize = SHA224_BLOCK_SIZE,
186	.cra_module = THIS_MODULE,
187	}
188	};
189
190	static bool __init sparc64_has_sha256_opcode(void)
191	{
192	unsigned long cfr;
193
194	if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
195	return false;
196
197	__asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
198	if (!(cfr & CFR_SHA256))
199	return false;
200
201	return true;
202	}
203
204	static int __init sha256_sparc64_mod_init(void)
205	{
206	if (sparc64_has_sha256_opcode()) {
207	int ret = crypto_register_shash(&sha224);
208	if (ret < 0)
209	return ret;
210
211	ret = crypto_register_shash(&sha256);
212	if (ret < 0) {
213	crypto_unregister_shash(&sha224);
214	return ret;
215	}
216
217	pr_info("Using sparc64 sha256 opcode optimized SHA-256/SHA-224 implementation\n");
218	return 0;
219	}
220	pr_info("sparc64 sha256 opcode not available.\n");
221	return -ENODEV;
222	}
223
224	static void __exit sha256_sparc64_mod_fini(void)
225	{
226	crypto_unregister_shash(&sha224);
227	crypto_unregister_shash(&sha256);
228	}
229
230	module_init(sha256_sparc64_mod_init);
231	module_exit(sha256_sparc64_mod_fini);
232
233	MODULE_LICENSE("GPL");
234	MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm, sparc64 sha256 opcode accelerated");
235
236	MODULE_ALIAS("sha224");
237	MODULE_ALIAS("sha256");