diff options
Diffstat (limited to 'arch/x86/crypto/serpent_sse2_glue.c')
| -rw-r--r-- | arch/x86/crypto/serpent_sse2_glue.c | 231 |
1 files changed, 231 insertions, 0 deletions
diff --git a/arch/x86/crypto/serpent_sse2_glue.c b/arch/x86/crypto/serpent_sse2_glue.c new file mode 100644 index 000000000..4fed8d26b --- /dev/null +++ b/arch/x86/crypto/serpent_sse2_glue.c @@ -0,0 +1,231 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Glue Code for SSE2 assembler versions of Serpent Cipher + * + * Copyright (c) 2011 Jussi Kivilinna <jussi.kivilinna@mbnet.fi> + * + * Glue code based on aesni-intel_glue.c by: + * Copyright (C) 2008, Intel Corp. + * Author: Huang Ying <ying.huang@intel.com> + * + * CBC & ECB parts based on code (crypto/cbc.c,ecb.c) by: + * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au> + * CTR part based on code (crypto/ctr.c) by: + * (C) Copyright IBM Corp. 2007 - Joy Latten <latten@us.ibm.com> + */ + +#include <linux/module.h> +#include <linux/types.h> +#include <linux/crypto.h> +#include <linux/err.h> +#include <crypto/algapi.h> +#include <crypto/b128ops.h> +#include <crypto/internal/simd.h> +#include <crypto/serpent.h> +#include <asm/crypto/serpent-sse2.h> +#include <asm/crypto/glue_helper.h> + +static int serpent_setkey_skcipher(struct crypto_skcipher *tfm, + const u8 *key, unsigned int keylen) +{ + return __serpent_setkey(crypto_skcipher_ctx(tfm), key, keylen); +} + +static void serpent_decrypt_cbc_xway(const void *ctx, u8 *d, const u8 *s) +{ + u128 ivs[SERPENT_PARALLEL_BLOCKS - 1]; + u128 *dst = (u128 *)d; + const u128 *src = (const u128 *)s; + unsigned int j; + + for (j = 0; j < SERPENT_PARALLEL_BLOCKS - 1; j++) + ivs[j] = src[j]; + + serpent_dec_blk_xway(ctx, (u8 *)dst, (u8 *)src); + + for (j = 0; j < SERPENT_PARALLEL_BLOCKS - 1; j++) + u128_xor(dst + (j + 1), dst + (j + 1), ivs + j); +} + +static void serpent_crypt_ctr(const void *ctx, u8 *d, const u8 *s, le128 *iv) +{ + be128 ctrblk; + u128 *dst = (u128 *)d; + const u128 *src = (const u128 *)s; + + le128_to_be128(&ctrblk, iv); + le128_inc(iv); + + __serpent_encrypt(ctx, (u8 *)&ctrblk, (u8 *)&ctrblk); + u128_xor(dst, src, (u128 *)&ctrblk); +} + +static void serpent_crypt_ctr_xway(const void *ctx, u8 *d, const u8 *s, + le128 *iv) +{ + be128 ctrblks[SERPENT_PARALLEL_BLOCKS]; + u128 *dst = (u128 *)d; + const u128 *src = (const u128 *)s; + unsigned int i; + + for (i = 0; i < SERPENT_PARALLEL_BLOCKS; i++) { + if (dst != src) + dst[i] = src[i]; + + le128_to_be128(&ctrblks[i], iv); + le128_inc(iv); + } + + serpent_enc_blk_xway_xor(ctx, (u8 *)dst, (u8 *)ctrblks); +} + +static const struct common_glue_ctx serpent_enc = { + .num_funcs = 2, + .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS, + + .funcs = { { + .num_blocks = SERPENT_PARALLEL_BLOCKS, + .fn_u = { .ecb = serpent_enc_blk_xway } + }, { + .num_blocks = 1, + .fn_u = { .ecb = __serpent_encrypt } + } } +}; + +static const struct common_glue_ctx serpent_ctr = { + .num_funcs = 2, + .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS, + + .funcs = { { + .num_blocks = SERPENT_PARALLEL_BLOCKS, + .fn_u = { .ctr = serpent_crypt_ctr_xway } + }, { + .num_blocks = 1, + .fn_u = { .ctr = serpent_crypt_ctr } + } } +}; + +static const struct common_glue_ctx serpent_dec = { + .num_funcs = 2, + .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS, + + .funcs = { { + .num_blocks = SERPENT_PARALLEL_BLOCKS, + .fn_u = { .ecb = serpent_dec_blk_xway } + }, { + .num_blocks = 1, + .fn_u = { .ecb = __serpent_decrypt } + } } +}; + +static const struct common_glue_ctx serpent_dec_cbc = { + .num_funcs = 2, + .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS, + + .funcs = { { + .num_blocks = SERPENT_PARALLEL_BLOCKS, + .fn_u = { .cbc = serpent_decrypt_cbc_xway } + }, { + .num_blocks = 1, + .fn_u = { .cbc = __serpent_decrypt } + } } +}; + +static int ecb_encrypt(struct skcipher_request *req) +{ + return glue_ecb_req_128bit(&serpent_enc, req); +} + +static int ecb_decrypt(struct skcipher_request *req) +{ + return glue_ecb_req_128bit(&serpent_dec, req); +} + +static int cbc_encrypt(struct skcipher_request *req) +{ + return glue_cbc_encrypt_req_128bit(__serpent_encrypt, + req); +} + +static int cbc_decrypt(struct skcipher_request *req) +{ + return glue_cbc_decrypt_req_128bit(&serpent_dec_cbc, req); +} + +static int ctr_crypt(struct skcipher_request *req) +{ + return glue_ctr_req_128bit(&serpent_ctr, req); +} + +static struct skcipher_alg serpent_algs[] = { + { + .base.cra_name = "__ecb(serpent)", + .base.cra_driver_name = "__ecb-serpent-sse2", + .base.cra_priority = 400, + .base.cra_flags = CRYPTO_ALG_INTERNAL, + .base.cra_blocksize = SERPENT_BLOCK_SIZE, + .base.cra_ctxsize = sizeof(struct serpent_ctx), + .base.cra_module = THIS_MODULE, + .min_keysize = SERPENT_MIN_KEY_SIZE, + .max_keysize = SERPENT_MAX_KEY_SIZE, + .setkey = serpent_setkey_skcipher, + .encrypt = ecb_encrypt, + .decrypt = ecb_decrypt, + }, { + .base.cra_name = "__cbc(serpent)", + .base.cra_driver_name = "__cbc-serpent-sse2", + .base.cra_priority = 400, + .base.cra_flags = CRYPTO_ALG_INTERNAL, + .base.cra_blocksize = SERPENT_BLOCK_SIZE, + .base.cra_ctxsize = sizeof(struct serpent_ctx), + .base.cra_module = THIS_MODULE, + .min_keysize = SERPENT_MIN_KEY_SIZE, + .max_keysize = SERPENT_MAX_KEY_SIZE, + .ivsize = SERPENT_BLOCK_SIZE, + .setkey = serpent_setkey_skcipher, + .encrypt = cbc_encrypt, + .decrypt = cbc_decrypt, + }, { + .base.cra_name = "__ctr(serpent)", + .base.cra_driver_name = "__ctr-serpent-sse2", + .base.cra_priority = 400, + .base.cra_flags = CRYPTO_ALG_INTERNAL, + .base.cra_blocksize = 1, + .base.cra_ctxsize = sizeof(struct serpent_ctx), + .base.cra_module = THIS_MODULE, + .min_keysize = SERPENT_MIN_KEY_SIZE, + .max_keysize = SERPENT_MAX_KEY_SIZE, + .ivsize = SERPENT_BLOCK_SIZE, + .chunksize = SERPENT_BLOCK_SIZE, + .setkey = serpent_setkey_skcipher, + .encrypt = ctr_crypt, + .decrypt = ctr_crypt, + }, +}; + +static struct simd_skcipher_alg *serpent_simd_algs[ARRAY_SIZE(serpent_algs)]; + +static int __init serpent_sse2_init(void) +{ + if (!boot_cpu_has(X86_FEATURE_XMM2)) { + printk(KERN_INFO "SSE2 instructions are not detected.\n"); + return -ENODEV; + } + + return simd_register_skciphers_compat(serpent_algs, + ARRAY_SIZE(serpent_algs), + serpent_simd_algs); +} + +static void __exit serpent_sse2_exit(void) +{ + simd_unregister_skciphers(serpent_algs, ARRAY_SIZE(serpent_algs), + serpent_simd_algs); +} + +module_init(serpent_sse2_init); +module_exit(serpent_sse2_exit); + +MODULE_DESCRIPTION("Serpent Cipher Algorithm, SSE2 optimized"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS_CRYPTO("serpent"); |