452 lines
12 KiB
C
452 lines
12 KiB
C
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/*
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* aes-ce-glue.c - wrapper code for ARMv8 AES
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*
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* Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <asm/hwcap.h>
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#include <asm/neon.h>
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#include <asm/hwcap.h>
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#include <crypto/aes.h>
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#include <crypto/internal/simd.h>
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#include <crypto/internal/skcipher.h>
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#include <linux/cpufeature.h>
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#include <linux/module.h>
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#include <crypto/xts.h>
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MODULE_DESCRIPTION("AES-ECB/CBC/CTR/XTS using ARMv8 Crypto Extensions");
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MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
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MODULE_LICENSE("GPL v2");
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/* defined in aes-ce-core.S */
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asmlinkage u32 ce_aes_sub(u32 input);
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asmlinkage void ce_aes_invert(void *dst, void *src);
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asmlinkage void ce_aes_ecb_encrypt(u8 out[], u8 const in[], u8 const rk[],
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int rounds, int blocks);
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asmlinkage void ce_aes_ecb_decrypt(u8 out[], u8 const in[], u8 const rk[],
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int rounds, int blocks);
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asmlinkage void ce_aes_cbc_encrypt(u8 out[], u8 const in[], u8 const rk[],
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int rounds, int blocks, u8 iv[]);
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asmlinkage void ce_aes_cbc_decrypt(u8 out[], u8 const in[], u8 const rk[],
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int rounds, int blocks, u8 iv[]);
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asmlinkage void ce_aes_ctr_encrypt(u8 out[], u8 const in[], u8 const rk[],
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int rounds, int blocks, u8 ctr[]);
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asmlinkage void ce_aes_xts_encrypt(u8 out[], u8 const in[], u8 const rk1[],
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int rounds, int blocks, u8 iv[],
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u8 const rk2[], int first);
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asmlinkage void ce_aes_xts_decrypt(u8 out[], u8 const in[], u8 const rk1[],
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int rounds, int blocks, u8 iv[],
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u8 const rk2[], int first);
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struct aes_block {
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u8 b[AES_BLOCK_SIZE];
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};
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static int num_rounds(struct crypto_aes_ctx *ctx)
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{
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/*
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* # of rounds specified by AES:
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* 128 bit key 10 rounds
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* 192 bit key 12 rounds
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* 256 bit key 14 rounds
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* => n byte key => 6 + (n/4) rounds
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*/
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return 6 + ctx->key_length / 4;
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}
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static int ce_aes_expandkey(struct crypto_aes_ctx *ctx, const u8 *in_key,
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unsigned int key_len)
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{
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/*
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* The AES key schedule round constants
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*/
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static u8 const rcon[] = {
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0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36,
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};
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u32 kwords = key_len / sizeof(u32);
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struct aes_block *key_enc, *key_dec;
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int i, j;
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if (key_len != AES_KEYSIZE_128 &&
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key_len != AES_KEYSIZE_192 &&
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key_len != AES_KEYSIZE_256)
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return -EINVAL;
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memcpy(ctx->key_enc, in_key, key_len);
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ctx->key_length = key_len;
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kernel_neon_begin();
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for (i = 0; i < sizeof(rcon); i++) {
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u32 *rki = ctx->key_enc + (i * kwords);
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u32 *rko = rki + kwords;
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#ifndef CONFIG_CPU_BIG_ENDIAN
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rko[0] = ror32(ce_aes_sub(rki[kwords - 1]), 8);
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rko[0] = rko[0] ^ rki[0] ^ rcon[i];
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#else
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rko[0] = rol32(ce_aes_sub(rki[kwords - 1]), 8);
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rko[0] = rko[0] ^ rki[0] ^ (rcon[i] << 24);
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#endif
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rko[1] = rko[0] ^ rki[1];
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rko[2] = rko[1] ^ rki[2];
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rko[3] = rko[2] ^ rki[3];
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if (key_len == AES_KEYSIZE_192) {
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if (i >= 7)
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break;
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rko[4] = rko[3] ^ rki[4];
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rko[5] = rko[4] ^ rki[5];
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} else if (key_len == AES_KEYSIZE_256) {
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if (i >= 6)
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break;
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rko[4] = ce_aes_sub(rko[3]) ^ rki[4];
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rko[5] = rko[4] ^ rki[5];
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rko[6] = rko[5] ^ rki[6];
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rko[7] = rko[6] ^ rki[7];
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}
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}
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/*
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* Generate the decryption keys for the Equivalent Inverse Cipher.
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* This involves reversing the order of the round keys, and applying
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* the Inverse Mix Columns transformation on all but the first and
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* the last one.
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*/
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key_enc = (struct aes_block *)ctx->key_enc;
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key_dec = (struct aes_block *)ctx->key_dec;
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j = num_rounds(ctx);
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key_dec[0] = key_enc[j];
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for (i = 1, j--; j > 0; i++, j--)
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ce_aes_invert(key_dec + i, key_enc + j);
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key_dec[i] = key_enc[0];
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kernel_neon_end();
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return 0;
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}
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static int ce_aes_setkey(struct crypto_skcipher *tfm, const u8 *in_key,
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unsigned int key_len)
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{
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struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
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int ret;
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ret = ce_aes_expandkey(ctx, in_key, key_len);
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if (!ret)
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return 0;
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crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
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return -EINVAL;
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}
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struct crypto_aes_xts_ctx {
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struct crypto_aes_ctx key1;
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struct crypto_aes_ctx __aligned(8) key2;
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};
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static int xts_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
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unsigned int key_len)
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{
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struct crypto_aes_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
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int ret;
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ret = xts_verify_key(tfm, in_key, key_len);
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if (ret)
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return ret;
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ret = ce_aes_expandkey(&ctx->key1, in_key, key_len / 2);
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if (!ret)
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ret = ce_aes_expandkey(&ctx->key2, &in_key[key_len / 2],
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key_len / 2);
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if (!ret)
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return 0;
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crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
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return -EINVAL;
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}
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static int ecb_encrypt(struct skcipher_request *req)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct skcipher_walk walk;
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unsigned int blocks;
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int err;
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err = skcipher_walk_virt(&walk, req, true);
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kernel_neon_begin();
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while ((blocks = (walk.nbytes / AES_BLOCK_SIZE))) {
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ce_aes_ecb_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
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(u8 *)ctx->key_enc, num_rounds(ctx), blocks);
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err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
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}
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kernel_neon_end();
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return err;
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}
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static int ecb_decrypt(struct skcipher_request *req)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct skcipher_walk walk;
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unsigned int blocks;
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int err;
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err = skcipher_walk_virt(&walk, req, true);
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kernel_neon_begin();
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while ((blocks = (walk.nbytes / AES_BLOCK_SIZE))) {
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ce_aes_ecb_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
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(u8 *)ctx->key_dec, num_rounds(ctx), blocks);
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err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
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}
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kernel_neon_end();
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return err;
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}
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static int cbc_encrypt(struct skcipher_request *req)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct skcipher_walk walk;
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unsigned int blocks;
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int err;
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err = skcipher_walk_virt(&walk, req, true);
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kernel_neon_begin();
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while ((blocks = (walk.nbytes / AES_BLOCK_SIZE))) {
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ce_aes_cbc_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
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(u8 *)ctx->key_enc, num_rounds(ctx), blocks,
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walk.iv);
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err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
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}
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kernel_neon_end();
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return err;
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}
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static int cbc_decrypt(struct skcipher_request *req)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct skcipher_walk walk;
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unsigned int blocks;
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int err;
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err = skcipher_walk_virt(&walk, req, true);
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kernel_neon_begin();
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while ((blocks = (walk.nbytes / AES_BLOCK_SIZE))) {
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ce_aes_cbc_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
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(u8 *)ctx->key_dec, num_rounds(ctx), blocks,
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walk.iv);
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err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
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}
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kernel_neon_end();
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return err;
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}
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static int ctr_encrypt(struct skcipher_request *req)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct skcipher_walk walk;
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int err, blocks;
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err = skcipher_walk_virt(&walk, req, true);
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kernel_neon_begin();
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while ((blocks = (walk.nbytes / AES_BLOCK_SIZE))) {
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ce_aes_ctr_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
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(u8 *)ctx->key_enc, num_rounds(ctx), blocks,
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walk.iv);
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err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
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}
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if (walk.nbytes) {
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u8 __aligned(8) tail[AES_BLOCK_SIZE];
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unsigned int nbytes = walk.nbytes;
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u8 *tdst = walk.dst.virt.addr;
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u8 *tsrc = walk.src.virt.addr;
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/*
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* Tell aes_ctr_encrypt() to process a tail block.
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*/
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blocks = -1;
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ce_aes_ctr_encrypt(tail, NULL, (u8 *)ctx->key_enc,
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num_rounds(ctx), blocks, walk.iv);
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crypto_xor_cpy(tdst, tsrc, tail, nbytes);
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err = skcipher_walk_done(&walk, 0);
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}
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kernel_neon_end();
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return err;
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}
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static int xts_encrypt(struct skcipher_request *req)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct crypto_aes_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
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int err, first, rounds = num_rounds(&ctx->key1);
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struct skcipher_walk walk;
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unsigned int blocks;
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err = skcipher_walk_virt(&walk, req, true);
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kernel_neon_begin();
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for (first = 1; (blocks = (walk.nbytes / AES_BLOCK_SIZE)); first = 0) {
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ce_aes_xts_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
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(u8 *)ctx->key1.key_enc, rounds, blocks,
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walk.iv, (u8 *)ctx->key2.key_enc, first);
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err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
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}
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kernel_neon_end();
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return err;
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}
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static int xts_decrypt(struct skcipher_request *req)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct crypto_aes_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
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int err, first, rounds = num_rounds(&ctx->key1);
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struct skcipher_walk walk;
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unsigned int blocks;
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err = skcipher_walk_virt(&walk, req, true);
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kernel_neon_begin();
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for (first = 1; (blocks = (walk.nbytes / AES_BLOCK_SIZE)); first = 0) {
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ce_aes_xts_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
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(u8 *)ctx->key1.key_dec, rounds, blocks,
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walk.iv, (u8 *)ctx->key2.key_enc, first);
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err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
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}
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kernel_neon_end();
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return err;
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}
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static struct skcipher_alg aes_algs[] = { {
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.base = {
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.cra_name = "__ecb(aes)",
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.cra_driver_name = "__ecb-aes-ce",
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.cra_priority = 300,
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.cra_flags = CRYPTO_ALG_INTERNAL,
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.cra_blocksize = AES_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct crypto_aes_ctx),
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.cra_module = THIS_MODULE,
|
||
|
|
},
|
||
|
|
.min_keysize = AES_MIN_KEY_SIZE,
|
||
|
|
.max_keysize = AES_MAX_KEY_SIZE,
|
||
|
|
.setkey = ce_aes_setkey,
|
||
|
|
.encrypt = ecb_encrypt,
|
||
|
|
.decrypt = ecb_decrypt,
|
||
|
|
}, {
|
||
|
|
.base = {
|
||
|
|
.cra_name = "__cbc(aes)",
|
||
|
|
.cra_driver_name = "__cbc-aes-ce",
|
||
|
|
.cra_priority = 300,
|
||
|
|
.cra_flags = CRYPTO_ALG_INTERNAL,
|
||
|
|
.cra_blocksize = AES_BLOCK_SIZE,
|
||
|
|
.cra_ctxsize = sizeof(struct crypto_aes_ctx),
|
||
|
|
.cra_module = THIS_MODULE,
|
||
|
|
},
|
||
|
|
.min_keysize = AES_MIN_KEY_SIZE,
|
||
|
|
.max_keysize = AES_MAX_KEY_SIZE,
|
||
|
|
.ivsize = AES_BLOCK_SIZE,
|
||
|
|
.setkey = ce_aes_setkey,
|
||
|
|
.encrypt = cbc_encrypt,
|
||
|
|
.decrypt = cbc_decrypt,
|
||
|
|
}, {
|
||
|
|
.base = {
|
||
|
|
.cra_name = "__ctr(aes)",
|
||
|
|
.cra_driver_name = "__ctr-aes-ce",
|
||
|
|
.cra_priority = 300,
|
||
|
|
.cra_flags = CRYPTO_ALG_INTERNAL,
|
||
|
|
.cra_blocksize = 1,
|
||
|
|
.cra_ctxsize = sizeof(struct crypto_aes_ctx),
|
||
|
|
.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 = ce_aes_setkey,
|
||
|
|
.encrypt = ctr_encrypt,
|
||
|
|
.decrypt = ctr_encrypt,
|
||
|
|
}, {
|
||
|
|
.base = {
|
||
|
|
.cra_name = "__xts(aes)",
|
||
|
|
.cra_driver_name = "__xts-aes-ce",
|
||
|
|
.cra_priority = 300,
|
||
|
|
.cra_flags = CRYPTO_ALG_INTERNAL,
|
||
|
|
.cra_blocksize = AES_BLOCK_SIZE,
|
||
|
|
.cra_ctxsize = sizeof(struct crypto_aes_xts_ctx),
|
||
|
|
.cra_module = THIS_MODULE,
|
||
|
|
},
|
||
|
|
.min_keysize = 2 * AES_MIN_KEY_SIZE,
|
||
|
|
.max_keysize = 2 * AES_MAX_KEY_SIZE,
|
||
|
|
.ivsize = AES_BLOCK_SIZE,
|
||
|
|
.setkey = xts_set_key,
|
||
|
|
.encrypt = xts_encrypt,
|
||
|
|
.decrypt = xts_decrypt,
|
||
|
|
} };
|
||
|
|
|
||
|
|
static struct simd_skcipher_alg *aes_simd_algs[ARRAY_SIZE(aes_algs)];
|
||
|
|
|
||
|
|
static void aes_exit(void)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
|
||
|
|
for (i = 0; i < ARRAY_SIZE(aes_simd_algs) && aes_simd_algs[i]; i++)
|
||
|
|
simd_skcipher_free(aes_simd_algs[i]);
|
||
|
|
|
||
|
|
crypto_unregister_skciphers(aes_algs, ARRAY_SIZE(aes_algs));
|
||
|
|
}
|
||
|
|
|
||
|
|
static int __init aes_init(void)
|
||
|
|
{
|
||
|
|
struct simd_skcipher_alg *simd;
|
||
|
|
const char *basename;
|
||
|
|
const char *algname;
|
||
|
|
const char *drvname;
|
||
|
|
int err;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
err = crypto_register_skciphers(aes_algs, ARRAY_SIZE(aes_algs));
|
||
|
|
if (err)
|
||
|
|
return err;
|
||
|
|
|
||
|
|
for (i = 0; i < ARRAY_SIZE(aes_algs); i++) {
|
||
|
|
algname = aes_algs[i].base.cra_name + 2;
|
||
|
|
drvname = aes_algs[i].base.cra_driver_name + 2;
|
||
|
|
basename = aes_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;
|
||
|
|
|
||
|
|
aes_simd_algs[i] = simd;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
unregister_simds:
|
||
|
|
aes_exit();
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
module_cpu_feature_match(AES, aes_init);
|
||
|
|
module_exit(aes_exit);
|