/*
 * Glue Code for x86_64/AVX/AES-NI assembler optimized version of Camellia
 *
 * Copyright © 2012-2013 Jussi Kivilinna <jussi.kivilinna@iki.fi>
 *
 * 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 <asm/crypto/camellia.h>
#include <asm/crypto/glue_helper.h>
#include <crypto/algapi.h>
#include <crypto/internal/simd.h>
#include <crypto/xts.h>
#include <linux/crypto.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/types.h>

#define CAMELLIA_AESNI_PARALLEL_BLOCKS 16

/* 16-way parallel cipher functions (avx/aes-ni) */
asmlinkage void camellia_ecb_enc_16way(struct camellia_ctx *ctx, u8 *dst,
				       const u8 *src);
EXPORT_SYMBOL_GPL(camellia_ecb_enc_16way);

asmlinkage void camellia_ecb_dec_16way(struct camellia_ctx *ctx, u8 *dst,
				       const u8 *src);
EXPORT_SYMBOL_GPL(camellia_ecb_dec_16way);

asmlinkage void camellia_cbc_dec_16way(struct camellia_ctx *ctx, u8 *dst,
				       const u8 *src);
EXPORT_SYMBOL_GPL(camellia_cbc_dec_16way);

asmlinkage void camellia_ctr_16way(struct camellia_ctx *ctx, u8 *dst,
				   const u8 *src, le128 *iv);
EXPORT_SYMBOL_GPL(camellia_ctr_16way);

asmlinkage void camellia_xts_enc_16way(struct camellia_ctx *ctx, u8 *dst,
				       const u8 *src, le128 *iv);
EXPORT_SYMBOL_GPL(camellia_xts_enc_16way);

asmlinkage void camellia_xts_dec_16way(struct camellia_ctx *ctx, u8 *dst,
				       const u8 *src, le128 *iv);
EXPORT_SYMBOL_GPL(camellia_xts_dec_16way);

void camellia_xts_enc(void *ctx, u128 *dst, const u128 *src, le128 *iv)
{
	glue_xts_crypt_128bit_one(ctx, dst, src, iv,
				  GLUE_FUNC_CAST(camellia_enc_blk));
}
EXPORT_SYMBOL_GPL(camellia_xts_enc);

void camellia_xts_dec(void *ctx, u128 *dst, const u128 *src, le128 *iv)
{
	glue_xts_crypt_128bit_one(ctx, dst, src, iv,
				  GLUE_FUNC_CAST(camellia_dec_blk));
}
EXPORT_SYMBOL_GPL(camellia_xts_dec);

static const struct common_glue_ctx camellia_enc = {
	.num_funcs = 3,
	.fpu_blocks_limit = CAMELLIA_AESNI_PARALLEL_BLOCKS,

	.funcs = { {
		.num_blocks = CAMELLIA_AESNI_PARALLEL_BLOCKS,
		.fn_u = { .ecb = GLUE_FUNC_CAST(camellia_ecb_enc_16way) }
	}, {
		.num_blocks = 2,
		.fn_u = { .ecb = GLUE_FUNC_CAST(camellia_enc_blk_2way) }
	}, {
		.num_blocks = 1,
		.fn_u = { .ecb = GLUE_FUNC_CAST(camellia_enc_blk) }
	} }
};

static const struct common_glue_ctx camellia_ctr = {
	.num_funcs = 3,
	.fpu_blocks_limit = CAMELLIA_AESNI_PARALLEL_BLOCKS,

	.funcs = { {
		.num_blocks = CAMELLIA_AESNI_PARALLEL_BLOCKS,
		.fn_u = { .ctr = GLUE_CTR_FUNC_CAST(camellia_ctr_16way) }
	}, {
		.num_blocks = 2,
		.fn_u = { .ctr = GLUE_CTR_FUNC_CAST(camellia_crypt_ctr_2way) }
	}, {
		.num_blocks = 1,
		.fn_u = { .ctr = GLUE_CTR_FUNC_CAST(camellia_crypt_ctr) }
	} }
};

static const struct common_glue_ctx camellia_enc_xts = {
	.num_funcs = 2,
	.fpu_blocks_limit = CAMELLIA_AESNI_PARALLEL_BLOCKS,

	.funcs = { {
		.num_blocks = CAMELLIA_AESNI_PARALLEL_BLOCKS,
		.fn_u = { .xts = GLUE_XTS_FUNC_CAST(camellia_xts_enc_16way) }
	}, {
		.num_blocks = 1,
		.fn_u = { .xts = GLUE_XTS_FUNC_CAST(camellia_xts_enc) }
	} }
};

static const struct common_glue_ctx camellia_dec = {
	.num_funcs = 3,
	.fpu_blocks_limit = CAMELLIA_AESNI_PARALLEL_BLOCKS,

	.funcs = { {
		.num_blocks = CAMELLIA_AESNI_PARALLEL_BLOCKS,
		.fn_u = { .ecb = GLUE_FUNC_CAST(camellia_ecb_dec_16way) }
	}, {
		.num_blocks = 2,
		.fn_u = { .ecb = GLUE_FUNC_CAST(camellia_dec_blk_2way) }
	}, {
		.num_blocks = 1,
		.fn_u = { .ecb = GLUE_FUNC_CAST(camellia_dec_blk) }
	} }
};

static const struct common_glue_ctx camellia_dec_cbc = {
	.num_funcs = 3,
	.fpu_blocks_limit = CAMELLIA_AESNI_PARALLEL_BLOCKS,

	.funcs = { {
		.num_blocks = CAMELLIA_AESNI_PARALLEL_BLOCKS,
		.fn_u = { .cbc = GLUE_CBC_FUNC_CAST(camellia_cbc_dec_16way) }
	}, {
		.num_blocks = 2,
		.fn_u = { .cbc = GLUE_CBC_FUNC_CAST(camellia_decrypt_cbc_2way) }
	}, {
		.num_blocks = 1,
		.fn_u = { .cbc = GLUE_CBC_FUNC_CAST(camellia_dec_blk) }
	} }
};

static const struct common_glue_ctx camellia_dec_xts = {
	.num_funcs = 2,
	.fpu_blocks_limit = CAMELLIA_AESNI_PARALLEL_BLOCKS,

	.funcs = { {
		.num_blocks = CAMELLIA_AESNI_PARALLEL_BLOCKS,
		.fn_u = { .xts = GLUE_XTS_FUNC_CAST(camellia_xts_dec_16way) }
	}, {
		.num_blocks = 1,
		.fn_u = { .xts = GLUE_XTS_FUNC_CAST(camellia_xts_dec) }
	} }
};

static int camellia_setkey(struct crypto_skcipher *tfm, const u8 *key,
			   unsigned int keylen)
{
	return __camellia_setkey(crypto_skcipher_ctx(tfm), key, keylen,
				 &tfm->base.crt_flags);
}

static int ecb_encrypt(struct skcipher_request *req)
{
	return glue_ecb_req_128bit(&camellia_enc, req);
}

static int ecb_decrypt(struct skcipher_request *req)
{
	return glue_ecb_req_128bit(&camellia_dec, req);
}

static int cbc_encrypt(struct skcipher_request *req)
{
	return glue_cbc_encrypt_req_128bit(GLUE_FUNC_CAST(camellia_enc_blk),
					   req);
}

static int cbc_decrypt(struct skcipher_request *req)
{
	return glue_cbc_decrypt_req_128bit(&camellia_dec_cbc, req);
}

static int ctr_crypt(struct skcipher_request *req)
{
	return glue_ctr_req_128bit(&camellia_ctr, req);
}

int xts_camellia_setkey(struct crypto_skcipher *tfm, const u8 *key,
			unsigned int keylen)
{
	struct camellia_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
	u32 *flags = &tfm->base.crt_flags;
	int err;

	err = xts_verify_key(tfm, key, keylen);
	if (err)
		return err;

	/* first half of xts-key is for crypt */
	err = __camellia_setkey(&ctx->crypt_ctx, key, keylen / 2, flags);
	if (err)
		return err;

	/* second half of xts-key is for tweak */
	return __camellia_setkey(&ctx->tweak_ctx, key + keylen / 2, keylen / 2,
				flags);
}
EXPORT_SYMBOL_GPL(xts_camellia_setkey);

static int xts_encrypt(struct skcipher_request *req)
{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct camellia_xts_ctx *ctx = crypto_skcipher_ctx(tfm);

	return glue_xts_req_128bit(&camellia_enc_xts, req,
				   XTS_TWEAK_CAST(camellia_enc_blk),
				   &ctx->tweak_ctx, &ctx->crypt_ctx);
}

static int xts_decrypt(struct skcipher_request *req)
{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct camellia_xts_ctx *ctx = crypto_skcipher_ctx(tfm);

	return glue_xts_req_128bit(&camellia_dec_xts, req,
				   XTS_TWEAK_CAST(camellia_enc_blk),
				   &ctx->tweak_ctx, &ctx->crypt_ctx);
}

static struct skcipher_alg camellia_algs[] = {
	{
		.base.cra_name		= "__ecb(camellia)",
		.base.cra_driver_name	= "__ecb-camellia-aesni",
		.base.cra_priority	= 400,
		.base.cra_flags		= CRYPTO_ALG_INTERNAL,
		.base.cra_blocksize	= CAMELLIA_BLOCK_SIZE,
		.base.cra_ctxsize	= sizeof(struct camellia_ctx),
		.base.cra_module	= THIS_MODULE,
		.min_keysize		= CAMELLIA_MIN_KEY_SIZE,
		.max_keysize		= CAMELLIA_MAX_KEY_SIZE,
		.setkey			= camellia_setkey,
		.encrypt		= ecb_encrypt,
		.decrypt		= ecb_decrypt,
	}, {
		.base.cra_name		= "__cbc(camellia)",
		.base.cra_driver_name	= "__cbc-camellia-aesni",
		.base.cra_priority	= 400,
		.base.cra_flags		= CRYPTO_ALG_INTERNAL,
		.base.cra_blocksize	= CAMELLIA_BLOCK_SIZE,
		.base.cra_ctxsize	= sizeof(struct camellia_ctx),
		.base.cra_module	= THIS_MODULE,
		.min_keysize		= CAMELLIA_MIN_KEY_SIZE,
		.max_keysize		= CAMELLIA_MAX_KEY_SIZE,
		.ivsize			= CAMELLIA_BLOCK_SIZE,
		.setkey			= camellia_setkey,
		.encrypt		= cbc_encrypt,
		.decrypt		= cbc_decrypt,
	}, {
		.base.cra_name		= "__ctr(camellia)",
		.base.cra_driver_name	= "__ctr-camellia-aesni",
		.base.cra_priority	= 400,
		.base.cra_flags		= CRYPTO_ALG_INTERNAL,
		.base.cra_blocksize	= 1,
		.base.cra_ctxsize	= sizeof(struct camellia_ctx),
		.base.cra_module	= THIS_MODULE,
		.min_keysize		= CAMELLIA_MIN_KEY_SIZE,
		.max_keysize		= CAMELLIA_MAX_KEY_SIZE,
		.ivsize			= CAMELLIA_BLOCK_SIZE,
		.chunksize		= CAMELLIA_BLOCK_SIZE,
		.setkey			= camellia_setkey,
		.encrypt		= ctr_crypt,
		.decrypt		= ctr_crypt,
	}, {
		.base.cra_name		= "__xts(camellia)",
		.base.cra_driver_name	= "__xts-camellia-aesni",
		.base.cra_priority	= 400,
		.base.cra_flags		= CRYPTO_ALG_INTERNAL,
		.base.cra_blocksize	= CAMELLIA_BLOCK_SIZE,
		.base.cra_ctxsize	= sizeof(struct camellia_xts_ctx),
		.base.cra_module	= THIS_MODULE,
		.min_keysize		= 2 * CAMELLIA_MIN_KEY_SIZE,
		.max_keysize		= 2 * CAMELLIA_MAX_KEY_SIZE,
		.ivsize			= CAMELLIA_BLOCK_SIZE,
		.setkey			= xts_camellia_setkey,
		.encrypt		= xts_encrypt,
		.decrypt		= xts_decrypt,
	},
};

static struct simd_skcipher_alg *camellia_simd_algs[ARRAY_SIZE(camellia_algs)];

static int __init camellia_aesni_init(void)
{
	const char *feature_name;

	if (!boot_cpu_has(X86_FEATURE_AVX) ||
	    !boot_cpu_has(X86_FEATURE_AES) ||
	    !boot_cpu_has(X86_FEATURE_OSXSAVE)) {
		pr_info("AVX or AES-NI instructions are not detected.\n");
		return -ENODEV;
	}

	if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
				&feature_name)) {
		pr_info("CPU feature '%s' is not supported.\n", feature_name);
		return -ENODEV;
	}

	return simd_register_skciphers_compat(camellia_algs,
					      ARRAY_SIZE(camellia_algs),
					      camellia_simd_algs);
}

static void __exit camellia_aesni_fini(void)
{
	simd_unregister_skciphers(camellia_algs, ARRAY_SIZE(camellia_algs),
				  camellia_simd_algs);
}

module_init(camellia_aesni_init);
module_exit(camellia_aesni_fini);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Camellia Cipher Algorithm, AES-NI/AVX optimized");
MODULE_ALIAS_CRYPTO("camellia");
MODULE_ALIAS_CRYPTO("camellia-asm");