summaryrefslogtreecommitdiff
path: root/arch/arm/crypto/aesbs-glue.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/crypto/aesbs-glue.c')
-rw-r--r--arch/arm/crypto/aesbs-glue.c367
1 files changed, 0 insertions, 367 deletions
diff --git a/arch/arm/crypto/aesbs-glue.c b/arch/arm/crypto/aesbs-glue.c
deleted file mode 100644
index d8e06de72ef3..000000000000
--- a/arch/arm/crypto/aesbs-glue.c
+++ /dev/null
@@ -1,367 +0,0 @@
-/*
- * linux/arch/arm/crypto/aesbs-glue.c - glue code for NEON bit sliced AES
- *
- * Copyright (C) 2013 Linaro Ltd <ard.biesheuvel@linaro.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include <asm/neon.h>
-#include <crypto/aes.h>
-#include <crypto/cbc.h>
-#include <crypto/internal/simd.h>
-#include <crypto/internal/skcipher.h>
-#include <linux/module.h>
-#include <crypto/xts.h>
-
-#include "aes_glue.h"
-
-#define BIT_SLICED_KEY_MAXSIZE (128 * (AES_MAXNR - 1) + 2 * AES_BLOCK_SIZE)
-
-struct BS_KEY {
- struct AES_KEY rk;
- int converted;
- u8 __aligned(8) bs[BIT_SLICED_KEY_MAXSIZE];
-} __aligned(8);
-
-asmlinkage void bsaes_enc_key_convert(u8 out[], struct AES_KEY const *in);
-asmlinkage void bsaes_dec_key_convert(u8 out[], struct AES_KEY const *in);
-
-asmlinkage void bsaes_cbc_encrypt(u8 const in[], u8 out[], u32 bytes,
- struct BS_KEY *key, u8 iv[]);
-
-asmlinkage void bsaes_ctr32_encrypt_blocks(u8 const in[], u8 out[], u32 blocks,
- struct BS_KEY *key, u8 const iv[]);
-
-asmlinkage void bsaes_xts_encrypt(u8 const in[], u8 out[], u32 bytes,
- struct BS_KEY *key, u8 tweak[]);
-
-asmlinkage void bsaes_xts_decrypt(u8 const in[], u8 out[], u32 bytes,
- struct BS_KEY *key, u8 tweak[]);
-
-struct aesbs_cbc_ctx {
- struct AES_KEY enc;
- struct BS_KEY dec;
-};
-
-struct aesbs_ctr_ctx {
- struct BS_KEY enc;
-};
-
-struct aesbs_xts_ctx {
- struct BS_KEY enc;
- struct BS_KEY dec;
- struct AES_KEY twkey;
-};
-
-static int aesbs_cbc_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
- unsigned int key_len)
-{
- struct aesbs_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
- int bits = key_len * 8;
-
- if (private_AES_set_encrypt_key(in_key, bits, &ctx->enc)) {
- crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
- return -EINVAL;
- }
- ctx->dec.rk = ctx->enc;
- private_AES_set_decrypt_key(in_key, bits, &ctx->dec.rk);
- ctx->dec.converted = 0;
- return 0;
-}
-
-static int aesbs_ctr_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
- unsigned int key_len)
-{
- struct aesbs_ctr_ctx *ctx = crypto_skcipher_ctx(tfm);
- int bits = key_len * 8;
-
- if (private_AES_set_encrypt_key(in_key, bits, &ctx->enc.rk)) {
- crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
- return -EINVAL;
- }
- ctx->enc.converted = 0;
- return 0;
-}
-
-static int aesbs_xts_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
- unsigned int key_len)
-{
- struct aesbs_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
- int bits = key_len * 4;
- int err;
-
- err = xts_verify_key(tfm, in_key, key_len);
- if (err)
- return err;
-
- if (private_AES_set_encrypt_key(in_key, bits, &ctx->enc.rk)) {
- crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
- return -EINVAL;
- }
- ctx->dec.rk = ctx->enc.rk;
- private_AES_set_decrypt_key(in_key, bits, &ctx->dec.rk);
- private_AES_set_encrypt_key(in_key + key_len / 2, bits, &ctx->twkey);
- ctx->enc.converted = ctx->dec.converted = 0;
- return 0;
-}
-
-static inline void aesbs_encrypt_one(struct crypto_skcipher *tfm,
- const u8 *src, u8 *dst)
-{
- struct aesbs_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
-
- AES_encrypt(src, dst, &ctx->enc);
-}
-
-static int aesbs_cbc_encrypt(struct skcipher_request *req)
-{
- return crypto_cbc_encrypt_walk(req, aesbs_encrypt_one);
-}
-
-static inline void aesbs_decrypt_one(struct crypto_skcipher *tfm,
- const u8 *src, u8 *dst)
-{
- struct aesbs_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
-
- AES_decrypt(src, dst, &ctx->dec.rk);
-}
-
-static int aesbs_cbc_decrypt(struct skcipher_request *req)
-{
- struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
- struct aesbs_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
- struct skcipher_walk walk;
- unsigned int nbytes;
- int err;
-
- for (err = skcipher_walk_virt(&walk, req, false);
- (nbytes = walk.nbytes); err = skcipher_walk_done(&walk, nbytes)) {
- u32 blocks = nbytes / AES_BLOCK_SIZE;
- u8 *dst = walk.dst.virt.addr;
- u8 *src = walk.src.virt.addr;
- u8 *iv = walk.iv;
-
- if (blocks >= 8) {
- kernel_neon_begin();
- bsaes_cbc_encrypt(src, dst, nbytes, &ctx->dec, iv);
- kernel_neon_end();
- nbytes %= AES_BLOCK_SIZE;
- continue;
- }
-
- nbytes = crypto_cbc_decrypt_blocks(&walk, tfm,
- aesbs_decrypt_one);
- }
- return err;
-}
-
-static void inc_be128_ctr(__be32 ctr[], u32 addend)
-{
- int i;
-
- for (i = 3; i >= 0; i--, addend = 1) {
- u32 n = be32_to_cpu(ctr[i]) + addend;
-
- ctr[i] = cpu_to_be32(n);
- if (n >= addend)
- break;
- }
-}
-
-static int aesbs_ctr_encrypt(struct skcipher_request *req)
-{
- struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
- struct aesbs_ctr_ctx *ctx = crypto_skcipher_ctx(tfm);
- struct skcipher_walk walk;
- u32 blocks;
- int err;
-
- err = skcipher_walk_virt(&walk, req, false);
-
- while ((blocks = walk.nbytes / AES_BLOCK_SIZE)) {
- u32 tail = walk.nbytes % AES_BLOCK_SIZE;
- __be32 *ctr = (__be32 *)walk.iv;
- u32 headroom = UINT_MAX - be32_to_cpu(ctr[3]);
-
- /* avoid 32 bit counter overflow in the NEON code */
- if (unlikely(headroom < blocks)) {
- blocks = headroom + 1;
- tail = walk.nbytes - blocks * AES_BLOCK_SIZE;
- }
- kernel_neon_begin();
- bsaes_ctr32_encrypt_blocks(walk.src.virt.addr,
- walk.dst.virt.addr, blocks,
- &ctx->enc, walk.iv);
- kernel_neon_end();
- inc_be128_ctr(ctr, blocks);
-
- err = skcipher_walk_done(&walk, tail);
- }
- if (walk.nbytes) {
- u8 *tdst = walk.dst.virt.addr + blocks * AES_BLOCK_SIZE;
- u8 *tsrc = walk.src.virt.addr + blocks * AES_BLOCK_SIZE;
- u8 ks[AES_BLOCK_SIZE];
-
- AES_encrypt(walk.iv, ks, &ctx->enc.rk);
- if (tdst != tsrc)
- memcpy(tdst, tsrc, walk.nbytes);
- crypto_xor(tdst, ks, walk.nbytes);
- err = skcipher_walk_done(&walk, 0);
- }
- return err;
-}
-
-static int aesbs_xts_encrypt(struct skcipher_request *req)
-{
- struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
- struct aesbs_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
- struct skcipher_walk walk;
- int err;
-
- err = skcipher_walk_virt(&walk, req, false);
-
- /* generate the initial tweak */
- AES_encrypt(walk.iv, walk.iv, &ctx->twkey);
-
- while (walk.nbytes) {
- kernel_neon_begin();
- bsaes_xts_encrypt(walk.src.virt.addr, walk.dst.virt.addr,
- walk.nbytes, &ctx->enc, walk.iv);
- kernel_neon_end();
- err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
- }
- return err;
-}
-
-static int aesbs_xts_decrypt(struct skcipher_request *req)
-{
- struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
- struct aesbs_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
- struct skcipher_walk walk;
- int err;
-
- err = skcipher_walk_virt(&walk, req, false);
-
- /* generate the initial tweak */
- AES_encrypt(walk.iv, walk.iv, &ctx->twkey);
-
- while (walk.nbytes) {
- kernel_neon_begin();
- bsaes_xts_decrypt(walk.src.virt.addr, walk.dst.virt.addr,
- walk.nbytes, &ctx->dec, walk.iv);
- kernel_neon_end();
- err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
- }
- return err;
-}
-
-static struct skcipher_alg aesbs_algs[] = { {
- .base = {
- .cra_name = "__cbc(aes)",
- .cra_driver_name = "__cbc-aes-neonbs",
- .cra_priority = 300,
- .cra_flags = CRYPTO_ALG_INTERNAL,
- .cra_blocksize = AES_BLOCK_SIZE,
- .cra_ctxsize = sizeof(struct aesbs_cbc_ctx),
- .cra_alignmask = 7,
- .cra_module = THIS_MODULE,
- },
- .min_keysize = AES_MIN_KEY_SIZE,
- .max_keysize = AES_MAX_KEY_SIZE,
- .ivsize = AES_BLOCK_SIZE,
- .setkey = aesbs_cbc_set_key,
- .encrypt = aesbs_cbc_encrypt,
- .decrypt = aesbs_cbc_decrypt,
-}, {
- .base = {
- .cra_name = "__ctr(aes)",
- .cra_driver_name = "__ctr-aes-neonbs",
- .cra_priority = 300,
- .cra_flags = CRYPTO_ALG_INTERNAL,
- .cra_blocksize = 1,
- .cra_ctxsize = sizeof(struct aesbs_ctr_ctx),
- .cra_alignmask = 7,
- .cra_module = THIS_MODULE,
- },
- .min_keysize = AES_MIN_KEY_SIZE,
- .max_keysize = AES_MAX_KEY_SIZE,
- .ivsize = AES_BLOCK_SIZE,
- .chunksize = AES_BLOCK_SIZE,
- .setkey = aesbs_ctr_set_key,
- .encrypt = aesbs_ctr_encrypt,
- .decrypt = aesbs_ctr_encrypt,
-}, {
- .base = {
- .cra_name = "__xts(aes)",
- .cra_driver_name = "__xts-aes-neonbs",
- .cra_priority = 300,
- .cra_flags = CRYPTO_ALG_INTERNAL,
- .cra_blocksize = AES_BLOCK_SIZE,
- .cra_ctxsize = sizeof(struct aesbs_xts_ctx),
- .cra_alignmask = 7,
- .cra_module = THIS_MODULE,
- },
- .min_keysize = 2 * AES_MIN_KEY_SIZE,
- .max_keysize = 2 * AES_MAX_KEY_SIZE,
- .ivsize = AES_BLOCK_SIZE,
- .setkey = aesbs_xts_set_key,
- .encrypt = aesbs_xts_encrypt,
- .decrypt = aesbs_xts_decrypt,
-} };
-
-struct simd_skcipher_alg *aesbs_simd_algs[ARRAY_SIZE(aesbs_algs)];
-
-static void aesbs_mod_exit(void)
-{
- int i;
-
- for (i = 0; i < ARRAY_SIZE(aesbs_simd_algs) && aesbs_simd_algs[i]; i++)
- simd_skcipher_free(aesbs_simd_algs[i]);
-
- crypto_unregister_skciphers(aesbs_algs, ARRAY_SIZE(aesbs_algs));
-}
-
-static int __init aesbs_mod_init(void)
-{
- struct simd_skcipher_alg *simd;
- const char *basename;
- const char *algname;
- const char *drvname;
- int err;
- int i;
-
- if (!cpu_has_neon())
- return -ENODEV;
-
- err = crypto_register_skciphers(aesbs_algs, ARRAY_SIZE(aesbs_algs));
- if (err)
- return err;
-
- for (i = 0; i < ARRAY_SIZE(aesbs_algs); i++) {
- algname = aesbs_algs[i].base.cra_name + 2;
- drvname = aesbs_algs[i].base.cra_driver_name + 2;
- basename = aesbs_algs[i].base.cra_driver_name;
- simd = simd_skcipher_create_compat(algname, drvname, basename);
- err = PTR_ERR(simd);
- if (IS_ERR(simd))
- goto unregister_simds;
-
- aesbs_simd_algs[i] = simd;
- }
-
- return 0;
-
-unregister_simds:
- aesbs_mod_exit();
- return err;
-}
-
-module_init(aesbs_mod_init);
-module_exit(aesbs_mod_exit);
-
-MODULE_DESCRIPTION("Bit sliced AES in CBC/CTR/XTS modes using NEON");
-MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
-MODULE_LICENSE("GPL");