diff options
Diffstat (limited to 'arch/arm64/crypto/aes-ce-glue.c')
| -rw-r--r-- | arch/arm64/crypto/aes-ce-glue.c | 179 |
1 files changed, 0 insertions, 179 deletions
diff --git a/arch/arm64/crypto/aes-ce-glue.c b/arch/arm64/crypto/aes-ce-glue.c deleted file mode 100644 index 00b8749013c5..000000000000 --- a/arch/arm64/crypto/aes-ce-glue.c +++ /dev/null @@ -1,179 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * aes-ce-cipher.c - core AES cipher using ARMv8 Crypto Extensions - * - * Copyright (C) 2013 - 2017 Linaro Ltd <ard.biesheuvel@linaro.org> - */ - -#include <asm/neon.h> -#include <asm/simd.h> -#include <linux/unaligned.h> -#include <crypto/aes.h> -#include <crypto/algapi.h> -#include <crypto/internal/simd.h> -#include <linux/cpufeature.h> -#include <linux/module.h> - -#include "aes-ce-setkey.h" - -MODULE_DESCRIPTION("Synchronous AES cipher using ARMv8 Crypto Extensions"); -MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>"); -MODULE_LICENSE("GPL v2"); - -struct aes_block { - u8 b[AES_BLOCK_SIZE]; -}; - -asmlinkage void __aes_ce_encrypt(u32 *rk, u8 *out, const u8 *in, int rounds); -asmlinkage void __aes_ce_decrypt(u32 *rk, u8 *out, const u8 *in, int rounds); - -asmlinkage u32 __aes_ce_sub(u32 l); -asmlinkage void __aes_ce_invert(struct aes_block *out, - const struct aes_block *in); - -static int num_rounds(struct crypto_aes_ctx *ctx) -{ - /* - * # of rounds specified by AES: - * 128 bit key 10 rounds - * 192 bit key 12 rounds - * 256 bit key 14 rounds - * => n byte key => 6 + (n/4) rounds - */ - return 6 + ctx->key_length / 4; -} - -static void aes_cipher_encrypt(struct crypto_tfm *tfm, u8 dst[], u8 const src[]) -{ - struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm); - - if (!crypto_simd_usable()) { - aes_encrypt(ctx, dst, src); - return; - } - - kernel_neon_begin(); - __aes_ce_encrypt(ctx->key_enc, dst, src, num_rounds(ctx)); - kernel_neon_end(); -} - -static void aes_cipher_decrypt(struct crypto_tfm *tfm, u8 dst[], u8 const src[]) -{ - struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm); - - if (!crypto_simd_usable()) { - aes_decrypt(ctx, dst, src); - return; - } - - kernel_neon_begin(); - __aes_ce_decrypt(ctx->key_dec, dst, src, num_rounds(ctx)); - kernel_neon_end(); -} - -int ce_aes_expandkey(struct crypto_aes_ctx *ctx, const u8 *in_key, - unsigned int key_len) -{ - /* - * The AES key schedule round constants - */ - static u8 const rcon[] = { - 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, - }; - - u32 kwords = key_len / sizeof(u32); - struct aes_block *key_enc, *key_dec; - int i, j; - - if (key_len != AES_KEYSIZE_128 && - key_len != AES_KEYSIZE_192 && - key_len != AES_KEYSIZE_256) - return -EINVAL; - - ctx->key_length = key_len; - for (i = 0; i < kwords; i++) - ctx->key_enc[i] = get_unaligned_le32(in_key + i * sizeof(u32)); - - kernel_neon_begin(); - for (i = 0; i < sizeof(rcon); i++) { - u32 *rki = ctx->key_enc + (i * kwords); - u32 *rko = rki + kwords; - - rko[0] = ror32(__aes_ce_sub(rki[kwords - 1]), 8) ^ rcon[i] ^ rki[0]; - rko[1] = rko[0] ^ rki[1]; - rko[2] = rko[1] ^ rki[2]; - rko[3] = rko[2] ^ rki[3]; - - if (key_len == AES_KEYSIZE_192) { - if (i >= 7) - break; - rko[4] = rko[3] ^ rki[4]; - rko[5] = rko[4] ^ rki[5]; - } else if (key_len == AES_KEYSIZE_256) { - if (i >= 6) - break; - rko[4] = __aes_ce_sub(rko[3]) ^ rki[4]; - rko[5] = rko[4] ^ rki[5]; - rko[6] = rko[5] ^ rki[6]; - rko[7] = rko[6] ^ rki[7]; - } - } - - /* - * Generate the decryption keys for the Equivalent Inverse Cipher. - * This involves reversing the order of the round keys, and applying - * the Inverse Mix Columns transformation on all but the first and - * the last one. - */ - key_enc = (struct aes_block *)ctx->key_enc; - key_dec = (struct aes_block *)ctx->key_dec; - j = num_rounds(ctx); - - key_dec[0] = key_enc[j]; - for (i = 1, j--; j > 0; i++, j--) - __aes_ce_invert(key_dec + i, key_enc + j); - key_dec[i] = key_enc[0]; - - kernel_neon_end(); - return 0; -} -EXPORT_SYMBOL(ce_aes_expandkey); - -int ce_aes_setkey(struct crypto_tfm *tfm, const u8 *in_key, - unsigned int key_len) -{ - struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm); - - return ce_aes_expandkey(ctx, in_key, key_len); -} -EXPORT_SYMBOL(ce_aes_setkey); - -static struct crypto_alg aes_alg = { - .cra_name = "aes", - .cra_driver_name = "aes-ce", - .cra_priority = 250, - .cra_flags = CRYPTO_ALG_TYPE_CIPHER, - .cra_blocksize = AES_BLOCK_SIZE, - .cra_ctxsize = sizeof(struct crypto_aes_ctx), - .cra_module = THIS_MODULE, - .cra_cipher = { - .cia_min_keysize = AES_MIN_KEY_SIZE, - .cia_max_keysize = AES_MAX_KEY_SIZE, - .cia_setkey = ce_aes_setkey, - .cia_encrypt = aes_cipher_encrypt, - .cia_decrypt = aes_cipher_decrypt - } -}; - -static int __init aes_mod_init(void) -{ - return crypto_register_alg(&aes_alg); -} - -static void __exit aes_mod_exit(void) -{ - crypto_unregister_alg(&aes_alg); -} - -module_cpu_feature_match(AES, aes_mod_init); -module_exit(aes_mod_exit); |