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-rw-r--r--arch/x86/crypto/cast6_avx_glue.c648
1 files changed, 648 insertions, 0 deletions
diff --git a/arch/x86/crypto/cast6_avx_glue.c b/arch/x86/crypto/cast6_avx_glue.c
new file mode 100644
index 000000000000..15e5f85a5011
--- /dev/null
+++ b/arch/x86/crypto/cast6_avx_glue.c
@@ -0,0 +1,648 @@
+/*
+ * Glue Code for the AVX assembler implemention of the Cast6 Cipher
+ *
+ * Copyright (C) 2012 Johannes Goetzfried
+ * <Johannes.Goetzfried@informatik.stud.uni-erlangen.de>
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+ * USA
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/hardirq.h>
+#include <linux/types.h>
+#include <linux/crypto.h>
+#include <linux/err.h>
+#include <crypto/algapi.h>
+#include <crypto/cast6.h>
+#include <crypto/cryptd.h>
+#include <crypto/b128ops.h>
+#include <crypto/ctr.h>
+#include <crypto/lrw.h>
+#include <crypto/xts.h>
+#include <asm/xcr.h>
+#include <asm/xsave.h>
+#include <asm/crypto/ablk_helper.h>
+#include <asm/crypto/glue_helper.h>
+
+#define CAST6_PARALLEL_BLOCKS 8
+
+asmlinkage void __cast6_enc_blk_8way(struct cast6_ctx *ctx, u8 *dst,
+ const u8 *src, bool xor);
+asmlinkage void cast6_dec_blk_8way(struct cast6_ctx *ctx, u8 *dst,
+ const u8 *src);
+
+static inline void cast6_enc_blk_xway(struct cast6_ctx *ctx, u8 *dst,
+ const u8 *src)
+{
+ __cast6_enc_blk_8way(ctx, dst, src, false);
+}
+
+static inline void cast6_enc_blk_xway_xor(struct cast6_ctx *ctx, u8 *dst,
+ const u8 *src)
+{
+ __cast6_enc_blk_8way(ctx, dst, src, true);
+}
+
+static inline void cast6_dec_blk_xway(struct cast6_ctx *ctx, u8 *dst,
+ const u8 *src)
+{
+ cast6_dec_blk_8way(ctx, dst, src);
+}
+
+
+static void cast6_decrypt_cbc_xway(void *ctx, u128 *dst, const u128 *src)
+{
+ u128 ivs[CAST6_PARALLEL_BLOCKS - 1];
+ unsigned int j;
+
+ for (j = 0; j < CAST6_PARALLEL_BLOCKS - 1; j++)
+ ivs[j] = src[j];
+
+ cast6_dec_blk_xway(ctx, (u8 *)dst, (u8 *)src);
+
+ for (j = 0; j < CAST6_PARALLEL_BLOCKS - 1; j++)
+ u128_xor(dst + (j + 1), dst + (j + 1), ivs + j);
+}
+
+static void cast6_crypt_ctr(void *ctx, u128 *dst, const u128 *src, u128 *iv)
+{
+ be128 ctrblk;
+
+ u128_to_be128(&ctrblk, iv);
+ u128_inc(iv);
+
+ __cast6_encrypt(ctx, (u8 *)&ctrblk, (u8 *)&ctrblk);
+ u128_xor(dst, src, (u128 *)&ctrblk);
+}
+
+static void cast6_crypt_ctr_xway(void *ctx, u128 *dst, const u128 *src,
+ u128 *iv)
+{
+ be128 ctrblks[CAST6_PARALLEL_BLOCKS];
+ unsigned int i;
+
+ for (i = 0; i < CAST6_PARALLEL_BLOCKS; i++) {
+ if (dst != src)
+ dst[i] = src[i];
+
+ u128_to_be128(&ctrblks[i], iv);
+ u128_inc(iv);
+ }
+
+ cast6_enc_blk_xway_xor(ctx, (u8 *)dst, (u8 *)ctrblks);
+}
+
+static const struct common_glue_ctx cast6_enc = {
+ .num_funcs = 2,
+ .fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
+
+ .funcs = { {
+ .num_blocks = CAST6_PARALLEL_BLOCKS,
+ .fn_u = { .ecb = GLUE_FUNC_CAST(cast6_enc_blk_xway) }
+ }, {
+ .num_blocks = 1,
+ .fn_u = { .ecb = GLUE_FUNC_CAST(__cast6_encrypt) }
+ } }
+};
+
+static const struct common_glue_ctx cast6_ctr = {
+ .num_funcs = 2,
+ .fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
+
+ .funcs = { {
+ .num_blocks = CAST6_PARALLEL_BLOCKS,
+ .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(cast6_crypt_ctr_xway) }
+ }, {
+ .num_blocks = 1,
+ .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(cast6_crypt_ctr) }
+ } }
+};
+
+static const struct common_glue_ctx cast6_dec = {
+ .num_funcs = 2,
+ .fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
+
+ .funcs = { {
+ .num_blocks = CAST6_PARALLEL_BLOCKS,
+ .fn_u = { .ecb = GLUE_FUNC_CAST(cast6_dec_blk_xway) }
+ }, {
+ .num_blocks = 1,
+ .fn_u = { .ecb = GLUE_FUNC_CAST(__cast6_decrypt) }
+ } }
+};
+
+static const struct common_glue_ctx cast6_dec_cbc = {
+ .num_funcs = 2,
+ .fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
+
+ .funcs = { {
+ .num_blocks = CAST6_PARALLEL_BLOCKS,
+ .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(cast6_decrypt_cbc_xway) }
+ }, {
+ .num_blocks = 1,
+ .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(__cast6_decrypt) }
+ } }
+};
+
+static int ecb_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
+ struct scatterlist *src, unsigned int nbytes)
+{
+ return glue_ecb_crypt_128bit(&cast6_enc, desc, dst, src, nbytes);
+}
+
+static int ecb_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
+ struct scatterlist *src, unsigned int nbytes)
+{
+ return glue_ecb_crypt_128bit(&cast6_dec, desc, dst, src, nbytes);
+}
+
+static int cbc_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
+ struct scatterlist *src, unsigned int nbytes)
+{
+ return glue_cbc_encrypt_128bit(GLUE_FUNC_CAST(__cast6_encrypt), desc,
+ dst, src, nbytes);
+}
+
+static int cbc_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
+ struct scatterlist *src, unsigned int nbytes)
+{
+ return glue_cbc_decrypt_128bit(&cast6_dec_cbc, desc, dst, src,
+ nbytes);
+}
+
+static int ctr_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
+ struct scatterlist *src, unsigned int nbytes)
+{
+ return glue_ctr_crypt_128bit(&cast6_ctr, desc, dst, src, nbytes);
+}
+
+static inline bool cast6_fpu_begin(bool fpu_enabled, unsigned int nbytes)
+{
+ return glue_fpu_begin(CAST6_BLOCK_SIZE, CAST6_PARALLEL_BLOCKS,
+ NULL, fpu_enabled, nbytes);
+}
+
+static inline void cast6_fpu_end(bool fpu_enabled)
+{
+ glue_fpu_end(fpu_enabled);
+}
+
+struct crypt_priv {
+ struct cast6_ctx *ctx;
+ bool fpu_enabled;
+};
+
+static void encrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
+{
+ const unsigned int bsize = CAST6_BLOCK_SIZE;
+ struct crypt_priv *ctx = priv;
+ int i;
+
+ ctx->fpu_enabled = cast6_fpu_begin(ctx->fpu_enabled, nbytes);
+
+ if (nbytes == bsize * CAST6_PARALLEL_BLOCKS) {
+ cast6_enc_blk_xway(ctx->ctx, srcdst, srcdst);
+ return;
+ }
+
+ for (i = 0; i < nbytes / bsize; i++, srcdst += bsize)
+ __cast6_encrypt(ctx->ctx, srcdst, srcdst);
+}
+
+static void decrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
+{
+ const unsigned int bsize = CAST6_BLOCK_SIZE;
+ struct crypt_priv *ctx = priv;
+ int i;
+
+ ctx->fpu_enabled = cast6_fpu_begin(ctx->fpu_enabled, nbytes);
+
+ if (nbytes == bsize * CAST6_PARALLEL_BLOCKS) {
+ cast6_dec_blk_xway(ctx->ctx, srcdst, srcdst);
+ return;
+ }
+
+ for (i = 0; i < nbytes / bsize; i++, srcdst += bsize)
+ __cast6_decrypt(ctx->ctx, srcdst, srcdst);
+}
+
+struct cast6_lrw_ctx {
+ struct lrw_table_ctx lrw_table;
+ struct cast6_ctx cast6_ctx;
+};
+
+static int lrw_cast6_setkey(struct crypto_tfm *tfm, const u8 *key,
+ unsigned int keylen)
+{
+ struct cast6_lrw_ctx *ctx = crypto_tfm_ctx(tfm);
+ int err;
+
+ err = __cast6_setkey(&ctx->cast6_ctx, key, keylen - CAST6_BLOCK_SIZE,
+ &tfm->crt_flags);
+ if (err)
+ return err;
+
+ return lrw_init_table(&ctx->lrw_table, key + keylen - CAST6_BLOCK_SIZE);
+}
+
+static int lrw_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
+ struct scatterlist *src, unsigned int nbytes)
+{
+ struct cast6_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
+ be128 buf[CAST6_PARALLEL_BLOCKS];
+ struct crypt_priv crypt_ctx = {
+ .ctx = &ctx->cast6_ctx,
+ .fpu_enabled = false,
+ };
+ struct lrw_crypt_req req = {
+ .tbuf = buf,
+ .tbuflen = sizeof(buf),
+
+ .table_ctx = &ctx->lrw_table,
+ .crypt_ctx = &crypt_ctx,
+ .crypt_fn = encrypt_callback,
+ };
+ int ret;
+
+ desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
+ ret = lrw_crypt(desc, dst, src, nbytes, &req);
+ cast6_fpu_end(crypt_ctx.fpu_enabled);
+
+ return ret;
+}
+
+static int lrw_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
+ struct scatterlist *src, unsigned int nbytes)
+{
+ struct cast6_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
+ be128 buf[CAST6_PARALLEL_BLOCKS];
+ struct crypt_priv crypt_ctx = {
+ .ctx = &ctx->cast6_ctx,
+ .fpu_enabled = false,
+ };
+ struct lrw_crypt_req req = {
+ .tbuf = buf,
+ .tbuflen = sizeof(buf),
+
+ .table_ctx = &ctx->lrw_table,
+ .crypt_ctx = &crypt_ctx,
+ .crypt_fn = decrypt_callback,
+ };
+ int ret;
+
+ desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
+ ret = lrw_crypt(desc, dst, src, nbytes, &req);
+ cast6_fpu_end(crypt_ctx.fpu_enabled);
+
+ return ret;
+}
+
+static void lrw_exit_tfm(struct crypto_tfm *tfm)
+{
+ struct cast6_lrw_ctx *ctx = crypto_tfm_ctx(tfm);
+
+ lrw_free_table(&ctx->lrw_table);
+}
+
+struct cast6_xts_ctx {
+ struct cast6_ctx tweak_ctx;
+ struct cast6_ctx crypt_ctx;
+};
+
+static int xts_cast6_setkey(struct crypto_tfm *tfm, const u8 *key,
+ unsigned int keylen)
+{
+ struct cast6_xts_ctx *ctx = crypto_tfm_ctx(tfm);
+ u32 *flags = &tfm->crt_flags;
+ int err;
+
+ /* key consists of keys of equal size concatenated, therefore
+ * the length must be even
+ */
+ if (keylen % 2) {
+ *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
+ return -EINVAL;
+ }
+
+ /* first half of xts-key is for crypt */
+ err = __cast6_setkey(&ctx->crypt_ctx, key, keylen / 2, flags);
+ if (err)
+ return err;
+
+ /* second half of xts-key is for tweak */
+ return __cast6_setkey(&ctx->tweak_ctx, key + keylen / 2, keylen / 2,
+ flags);
+}
+
+static int xts_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
+ struct scatterlist *src, unsigned int nbytes)
+{
+ struct cast6_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
+ be128 buf[CAST6_PARALLEL_BLOCKS];
+ struct crypt_priv crypt_ctx = {
+ .ctx = &ctx->crypt_ctx,
+ .fpu_enabled = false,
+ };
+ struct xts_crypt_req req = {
+ .tbuf = buf,
+ .tbuflen = sizeof(buf),
+
+ .tweak_ctx = &ctx->tweak_ctx,
+ .tweak_fn = XTS_TWEAK_CAST(__cast6_encrypt),
+ .crypt_ctx = &crypt_ctx,
+ .crypt_fn = encrypt_callback,
+ };
+ int ret;
+
+ desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
+ ret = xts_crypt(desc, dst, src, nbytes, &req);
+ cast6_fpu_end(crypt_ctx.fpu_enabled);
+
+ return ret;
+}
+
+static int xts_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
+ struct scatterlist *src, unsigned int nbytes)
+{
+ struct cast6_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
+ be128 buf[CAST6_PARALLEL_BLOCKS];
+ struct crypt_priv crypt_ctx = {
+ .ctx = &ctx->crypt_ctx,
+ .fpu_enabled = false,
+ };
+ struct xts_crypt_req req = {
+ .tbuf = buf,
+ .tbuflen = sizeof(buf),
+
+ .tweak_ctx = &ctx->tweak_ctx,
+ .tweak_fn = XTS_TWEAK_CAST(__cast6_encrypt),
+ .crypt_ctx = &crypt_ctx,
+ .crypt_fn = decrypt_callback,
+ };
+ int ret;
+
+ desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
+ ret = xts_crypt(desc, dst, src, nbytes, &req);
+ cast6_fpu_end(crypt_ctx.fpu_enabled);
+
+ return ret;
+}
+
+static struct crypto_alg cast6_algs[10] = { {
+ .cra_name = "__ecb-cast6-avx",
+ .cra_driver_name = "__driver-ecb-cast6-avx",
+ .cra_priority = 0,
+ .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
+ .cra_blocksize = CAST6_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct cast6_ctx),
+ .cra_alignmask = 0,
+ .cra_type = &crypto_blkcipher_type,
+ .cra_module = THIS_MODULE,
+ .cra_u = {
+ .blkcipher = {
+ .min_keysize = CAST6_MIN_KEY_SIZE,
+ .max_keysize = CAST6_MAX_KEY_SIZE,
+ .setkey = cast6_setkey,
+ .encrypt = ecb_encrypt,
+ .decrypt = ecb_decrypt,
+ },
+ },
+}, {
+ .cra_name = "__cbc-cast6-avx",
+ .cra_driver_name = "__driver-cbc-cast6-avx",
+ .cra_priority = 0,
+ .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
+ .cra_blocksize = CAST6_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct cast6_ctx),
+ .cra_alignmask = 0,
+ .cra_type = &crypto_blkcipher_type,
+ .cra_module = THIS_MODULE,
+ .cra_u = {
+ .blkcipher = {
+ .min_keysize = CAST6_MIN_KEY_SIZE,
+ .max_keysize = CAST6_MAX_KEY_SIZE,
+ .setkey = cast6_setkey,
+ .encrypt = cbc_encrypt,
+ .decrypt = cbc_decrypt,
+ },
+ },
+}, {
+ .cra_name = "__ctr-cast6-avx",
+ .cra_driver_name = "__driver-ctr-cast6-avx",
+ .cra_priority = 0,
+ .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
+ .cra_blocksize = 1,
+ .cra_ctxsize = sizeof(struct cast6_ctx),
+ .cra_alignmask = 0,
+ .cra_type = &crypto_blkcipher_type,
+ .cra_module = THIS_MODULE,
+ .cra_u = {
+ .blkcipher = {
+ .min_keysize = CAST6_MIN_KEY_SIZE,
+ .max_keysize = CAST6_MAX_KEY_SIZE,
+ .ivsize = CAST6_BLOCK_SIZE,
+ .setkey = cast6_setkey,
+ .encrypt = ctr_crypt,
+ .decrypt = ctr_crypt,
+ },
+ },
+}, {
+ .cra_name = "__lrw-cast6-avx",
+ .cra_driver_name = "__driver-lrw-cast6-avx",
+ .cra_priority = 0,
+ .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
+ .cra_blocksize = CAST6_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct cast6_lrw_ctx),
+ .cra_alignmask = 0,
+ .cra_type = &crypto_blkcipher_type,
+ .cra_module = THIS_MODULE,
+ .cra_exit = lrw_exit_tfm,
+ .cra_u = {
+ .blkcipher = {
+ .min_keysize = CAST6_MIN_KEY_SIZE +
+ CAST6_BLOCK_SIZE,
+ .max_keysize = CAST6_MAX_KEY_SIZE +
+ CAST6_BLOCK_SIZE,
+ .ivsize = CAST6_BLOCK_SIZE,
+ .setkey = lrw_cast6_setkey,
+ .encrypt = lrw_encrypt,
+ .decrypt = lrw_decrypt,
+ },
+ },
+}, {
+ .cra_name = "__xts-cast6-avx",
+ .cra_driver_name = "__driver-xts-cast6-avx",
+ .cra_priority = 0,
+ .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
+ .cra_blocksize = CAST6_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct cast6_xts_ctx),
+ .cra_alignmask = 0,
+ .cra_type = &crypto_blkcipher_type,
+ .cra_module = THIS_MODULE,
+ .cra_u = {
+ .blkcipher = {
+ .min_keysize = CAST6_MIN_KEY_SIZE * 2,
+ .max_keysize = CAST6_MAX_KEY_SIZE * 2,
+ .ivsize = CAST6_BLOCK_SIZE,
+ .setkey = xts_cast6_setkey,
+ .encrypt = xts_encrypt,
+ .decrypt = xts_decrypt,
+ },
+ },
+}, {
+ .cra_name = "ecb(cast6)",
+ .cra_driver_name = "ecb-cast6-avx",
+ .cra_priority = 200,
+ .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
+ .cra_blocksize = CAST6_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct async_helper_ctx),
+ .cra_alignmask = 0,
+ .cra_type = &crypto_ablkcipher_type,
+ .cra_module = THIS_MODULE,
+ .cra_init = ablk_init,
+ .cra_exit = ablk_exit,
+ .cra_u = {
+ .ablkcipher = {
+ .min_keysize = CAST6_MIN_KEY_SIZE,
+ .max_keysize = CAST6_MAX_KEY_SIZE,
+ .setkey = ablk_set_key,
+ .encrypt = ablk_encrypt,
+ .decrypt = ablk_decrypt,
+ },
+ },
+}, {
+ .cra_name = "cbc(cast6)",
+ .cra_driver_name = "cbc-cast6-avx",
+ .cra_priority = 200,
+ .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
+ .cra_blocksize = CAST6_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct async_helper_ctx),
+ .cra_alignmask = 0,
+ .cra_type = &crypto_ablkcipher_type,
+ .cra_module = THIS_MODULE,
+ .cra_init = ablk_init,
+ .cra_exit = ablk_exit,
+ .cra_u = {
+ .ablkcipher = {
+ .min_keysize = CAST6_MIN_KEY_SIZE,
+ .max_keysize = CAST6_MAX_KEY_SIZE,
+ .ivsize = CAST6_BLOCK_SIZE,
+ .setkey = ablk_set_key,
+ .encrypt = __ablk_encrypt,
+ .decrypt = ablk_decrypt,
+ },
+ },
+}, {
+ .cra_name = "ctr(cast6)",
+ .cra_driver_name = "ctr-cast6-avx",
+ .cra_priority = 200,
+ .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
+ .cra_blocksize = 1,
+ .cra_ctxsize = sizeof(struct async_helper_ctx),
+ .cra_alignmask = 0,
+ .cra_type = &crypto_ablkcipher_type,
+ .cra_module = THIS_MODULE,
+ .cra_init = ablk_init,
+ .cra_exit = ablk_exit,
+ .cra_u = {
+ .ablkcipher = {
+ .min_keysize = CAST6_MIN_KEY_SIZE,
+ .max_keysize = CAST6_MAX_KEY_SIZE,
+ .ivsize = CAST6_BLOCK_SIZE,
+ .setkey = ablk_set_key,
+ .encrypt = ablk_encrypt,
+ .decrypt = ablk_encrypt,
+ .geniv = "chainiv",
+ },
+ },
+}, {
+ .cra_name = "lrw(cast6)",
+ .cra_driver_name = "lrw-cast6-avx",
+ .cra_priority = 200,
+ .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
+ .cra_blocksize = CAST6_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct async_helper_ctx),
+ .cra_alignmask = 0,
+ .cra_type = &crypto_ablkcipher_type,
+ .cra_module = THIS_MODULE,
+ .cra_init = ablk_init,
+ .cra_exit = ablk_exit,
+ .cra_u = {
+ .ablkcipher = {
+ .min_keysize = CAST6_MIN_KEY_SIZE +
+ CAST6_BLOCK_SIZE,
+ .max_keysize = CAST6_MAX_KEY_SIZE +
+ CAST6_BLOCK_SIZE,
+ .ivsize = CAST6_BLOCK_SIZE,
+ .setkey = ablk_set_key,
+ .encrypt = ablk_encrypt,
+ .decrypt = ablk_decrypt,
+ },
+ },
+}, {
+ .cra_name = "xts(cast6)",
+ .cra_driver_name = "xts-cast6-avx",
+ .cra_priority = 200,
+ .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
+ .cra_blocksize = CAST6_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct async_helper_ctx),
+ .cra_alignmask = 0,
+ .cra_type = &crypto_ablkcipher_type,
+ .cra_module = THIS_MODULE,
+ .cra_init = ablk_init,
+ .cra_exit = ablk_exit,
+ .cra_u = {
+ .ablkcipher = {
+ .min_keysize = CAST6_MIN_KEY_SIZE * 2,
+ .max_keysize = CAST6_MAX_KEY_SIZE * 2,
+ .ivsize = CAST6_BLOCK_SIZE,
+ .setkey = ablk_set_key,
+ .encrypt = ablk_encrypt,
+ .decrypt = ablk_decrypt,
+ },
+ },
+} };
+
+static int __init cast6_init(void)
+{
+ u64 xcr0;
+
+ if (!cpu_has_avx || !cpu_has_osxsave) {
+ pr_info("AVX instructions are not detected.\n");
+ return -ENODEV;
+ }
+
+ xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK);
+ if ((xcr0 & (XSTATE_SSE | XSTATE_YMM)) != (XSTATE_SSE | XSTATE_YMM)) {
+ pr_info("AVX detected but unusable.\n");
+ return -ENODEV;
+ }
+
+ return crypto_register_algs(cast6_algs, ARRAY_SIZE(cast6_algs));
+}
+
+static void __exit cast6_exit(void)
+{
+ crypto_unregister_algs(cast6_algs, ARRAY_SIZE(cast6_algs));
+}
+
+module_init(cast6_init);
+module_exit(cast6_exit);
+
+MODULE_DESCRIPTION("Cast6 Cipher Algorithm, AVX optimized");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("cast6");
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.