462 lines
14 KiB
C
462 lines
14 KiB
C
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/*
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* linux/arch/arm64/crypto/aes-glue.c - wrapper code for ARMv8 AES
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*
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* Copyright (C) 2013 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/neon.h>
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#include <asm/hwcap.h>
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#include <crypto/aes.h>
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#include <crypto/ablk_helper.h>
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#include <crypto/algapi.h>
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#include <linux/module.h>
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#include <linux/cpufeature.h>
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#include <crypto/xts.h>
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#include "aes-ce-setkey.h"
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#ifdef USE_V8_CRYPTO_EXTENSIONS
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#define MODE "ce"
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#define PRIO 300
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#define aes_setkey ce_aes_setkey
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#define aes_expandkey ce_aes_expandkey
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#define aes_ecb_encrypt ce_aes_ecb_encrypt
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#define aes_ecb_decrypt ce_aes_ecb_decrypt
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#define aes_cbc_encrypt ce_aes_cbc_encrypt
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#define aes_cbc_decrypt ce_aes_cbc_decrypt
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#define aes_ctr_encrypt ce_aes_ctr_encrypt
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#define aes_xts_encrypt ce_aes_xts_encrypt
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#define aes_xts_decrypt ce_aes_xts_decrypt
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MODULE_DESCRIPTION("AES-ECB/CBC/CTR/XTS using ARMv8 Crypto Extensions");
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#else
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#define MODE "neon"
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#define PRIO 200
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#define aes_setkey crypto_aes_set_key
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#define aes_expandkey crypto_aes_expand_key
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#define aes_ecb_encrypt neon_aes_ecb_encrypt
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#define aes_ecb_decrypt neon_aes_ecb_decrypt
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#define aes_cbc_encrypt neon_aes_cbc_encrypt
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#define aes_cbc_decrypt neon_aes_cbc_decrypt
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#define aes_ctr_encrypt neon_aes_ctr_encrypt
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#define aes_xts_encrypt neon_aes_xts_encrypt
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#define aes_xts_decrypt neon_aes_xts_decrypt
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MODULE_DESCRIPTION("AES-ECB/CBC/CTR/XTS using ARMv8 NEON");
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MODULE_ALIAS_CRYPTO("ecb(aes)");
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MODULE_ALIAS_CRYPTO("cbc(aes)");
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MODULE_ALIAS_CRYPTO("ctr(aes)");
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MODULE_ALIAS_CRYPTO("xts(aes)");
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#endif
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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-modes.S */
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asmlinkage void aes_ecb_encrypt(u8 out[], u8 const in[], u8 const rk[],
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int rounds, int blocks, int first);
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asmlinkage void aes_ecb_decrypt(u8 out[], u8 const in[], u8 const rk[],
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int rounds, int blocks, int first);
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asmlinkage void aes_cbc_encrypt(u8 out[], u8 const in[], u8 const rk[],
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int rounds, int blocks, u8 iv[], int first);
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asmlinkage void aes_cbc_decrypt(u8 out[], u8 const in[], u8 const rk[],
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int rounds, int blocks, u8 iv[], int first);
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asmlinkage void aes_ctr_encrypt(u8 out[], u8 const in[], u8 const rk[],
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int rounds, int blocks, u8 ctr[], int first);
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asmlinkage void aes_xts_encrypt(u8 out[], u8 const in[], u8 const rk1[],
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int rounds, int blocks, u8 const rk2[], u8 iv[],
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int first);
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asmlinkage void aes_xts_decrypt(u8 out[], u8 const in[], u8 const rk1[],
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int rounds, int blocks, u8 const rk2[], u8 iv[],
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int first);
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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_tfm *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_tfm_ctx(tfm);
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int ret;
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ret = xts_check_key(tfm, in_key, key_len);
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if (ret)
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return ret;
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ret = aes_expandkey(&ctx->key1, in_key, key_len / 2);
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if (!ret)
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ret = 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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tfm->crt_flags |= 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 blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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struct crypto_aes_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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int err, first, rounds = 6 + ctx->key_length / 4;
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struct blkcipher_walk walk;
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unsigned int blocks;
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desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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err = blkcipher_walk_virt(desc, &walk);
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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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aes_ecb_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
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(u8 *)ctx->key_enc, rounds, blocks, first);
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err = blkcipher_walk_done(desc, &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 blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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struct crypto_aes_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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int err, first, rounds = 6 + ctx->key_length / 4;
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struct blkcipher_walk walk;
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unsigned int blocks;
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desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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err = blkcipher_walk_virt(desc, &walk);
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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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aes_ecb_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
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(u8 *)ctx->key_dec, rounds, blocks, first);
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err = blkcipher_walk_done(desc, &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 blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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struct crypto_aes_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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int err, first, rounds = 6 + ctx->key_length / 4;
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struct blkcipher_walk walk;
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unsigned int blocks;
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desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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err = blkcipher_walk_virt(desc, &walk);
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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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aes_cbc_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
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(u8 *)ctx->key_enc, rounds, blocks, walk.iv,
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first);
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err = blkcipher_walk_done(desc, &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 blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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struct crypto_aes_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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int err, first, rounds = 6 + ctx->key_length / 4;
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struct blkcipher_walk walk;
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unsigned int blocks;
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desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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err = blkcipher_walk_virt(desc, &walk);
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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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aes_cbc_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
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(u8 *)ctx->key_dec, rounds, blocks, walk.iv,
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first);
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err = blkcipher_walk_done(desc, &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 blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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struct crypto_aes_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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int err, first, rounds = 6 + ctx->key_length / 4;
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struct blkcipher_walk walk;
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int blocks;
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desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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err = blkcipher_walk_virt_block(desc, &walk, AES_BLOCK_SIZE);
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first = 1;
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kernel_neon_begin();
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while ((blocks = (walk.nbytes / AES_BLOCK_SIZE))) {
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aes_ctr_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
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(u8 *)ctx->key_enc, rounds, blocks, walk.iv,
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first);
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first = 0;
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nbytes -= blocks * AES_BLOCK_SIZE;
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if (nbytes && nbytes == walk.nbytes % AES_BLOCK_SIZE)
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break;
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err = blkcipher_walk_done(desc, &walk,
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walk.nbytes % AES_BLOCK_SIZE);
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}
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if (walk.nbytes % AES_BLOCK_SIZE) {
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u8 *tdst = walk.dst.virt.addr + blocks * AES_BLOCK_SIZE;
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u8 *tsrc = walk.src.virt.addr + blocks * AES_BLOCK_SIZE;
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u8 __aligned(8) tail[AES_BLOCK_SIZE];
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/*
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* Minimum alignment is 8 bytes, so if nbytes is <= 8, we need
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* to tell aes_ctr_encrypt() to only read half a block.
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*/
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blocks = (nbytes <= 8) ? -1 : 1;
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aes_ctr_encrypt(tail, tsrc, (u8 *)ctx->key_enc, rounds,
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blocks, walk.iv, first);
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memcpy(tdst, tail, nbytes);
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err = blkcipher_walk_done(desc, &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 blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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struct crypto_aes_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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int err, first, rounds = 6 + ctx->key1.key_length / 4;
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struct blkcipher_walk walk;
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unsigned int blocks;
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desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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err = blkcipher_walk_virt(desc, &walk);
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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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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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(u8 *)ctx->key2.key_enc, walk.iv, first);
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err = blkcipher_walk_done(desc, &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 blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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struct crypto_aes_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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int err, first, rounds = 6 + ctx->key1.key_length / 4;
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struct blkcipher_walk walk;
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unsigned int blocks;
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desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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err = blkcipher_walk_virt(desc, &walk);
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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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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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(u8 *)ctx->key2.key_enc, walk.iv, first);
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err = blkcipher_walk_done(desc, &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 crypto_alg aes_algs[] = { {
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.cra_name = "__ecb-aes-" MODE,
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.cra_driver_name = "__driver-ecb-aes-" MODE,
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.cra_priority = 0,
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.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
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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_alignmask = 7,
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.cra_type = &crypto_blkcipher_type,
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.cra_module = THIS_MODULE,
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.cra_blkcipher = {
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.min_keysize = AES_MIN_KEY_SIZE,
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.max_keysize = AES_MAX_KEY_SIZE,
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.ivsize = 0,
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.setkey = aes_setkey,
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.encrypt = ecb_encrypt,
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.decrypt = ecb_decrypt,
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},
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}, {
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.cra_name = "__cbc-aes-" MODE,
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.cra_driver_name = "__driver-cbc-aes-" MODE,
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.cra_priority = 0,
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.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
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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_alignmask = 7,
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.cra_type = &crypto_blkcipher_type,
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.cra_module = THIS_MODULE,
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.cra_blkcipher = {
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.min_keysize = AES_MIN_KEY_SIZE,
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.max_keysize = AES_MAX_KEY_SIZE,
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.ivsize = AES_BLOCK_SIZE,
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.setkey = aes_setkey,
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.encrypt = cbc_encrypt,
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.decrypt = cbc_decrypt,
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},
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}, {
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.cra_name = "__ctr-aes-" MODE,
|
||
|
|
.cra_driver_name = "__driver-ctr-aes-" MODE,
|
||
|
|
.cra_priority = 0,
|
||
|
|
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
|
||
|
|
CRYPTO_ALG_INTERNAL,
|
||
|
|
.cra_blocksize = 1,
|
||
|
|
.cra_ctxsize = sizeof(struct crypto_aes_ctx),
|
||
|
|
.cra_alignmask = 7,
|
||
|
|
.cra_type = &crypto_blkcipher_type,
|
||
|
|
.cra_module = THIS_MODULE,
|
||
|
|
.cra_blkcipher = {
|
||
|
|
.min_keysize = AES_MIN_KEY_SIZE,
|
||
|
|
.max_keysize = AES_MAX_KEY_SIZE,
|
||
|
|
.ivsize = AES_BLOCK_SIZE,
|
||
|
|
.setkey = aes_setkey,
|
||
|
|
.encrypt = ctr_encrypt,
|
||
|
|
.decrypt = ctr_encrypt,
|
||
|
|
},
|
||
|
|
}, {
|
||
|
|
.cra_name = "__xts-aes-" MODE,
|
||
|
|
.cra_driver_name = "__driver-xts-aes-" MODE,
|
||
|
|
.cra_priority = 0,
|
||
|
|
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
|
||
|
|
CRYPTO_ALG_INTERNAL,
|
||
|
|
.cra_blocksize = AES_BLOCK_SIZE,
|
||
|
|
.cra_ctxsize = sizeof(struct crypto_aes_xts_ctx),
|
||
|
|
.cra_alignmask = 7,
|
||
|
|
.cra_type = &crypto_blkcipher_type,
|
||
|
|
.cra_module = THIS_MODULE,
|
||
|
|
.cra_blkcipher = {
|
||
|
|
.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,
|
||
|
|
},
|
||
|
|
}, {
|
||
|
|
.cra_name = "ecb(aes)",
|
||
|
|
.cra_driver_name = "ecb-aes-" MODE,
|
||
|
|
.cra_priority = PRIO,
|
||
|
|
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER|CRYPTO_ALG_ASYNC,
|
||
|
|
.cra_blocksize = AES_BLOCK_SIZE,
|
||
|
|
.cra_ctxsize = sizeof(struct async_helper_ctx),
|
||
|
|
.cra_alignmask = 7,
|
||
|
|
.cra_type = &crypto_ablkcipher_type,
|
||
|
|
.cra_module = THIS_MODULE,
|
||
|
|
.cra_init = ablk_init,
|
||
|
|
.cra_exit = ablk_exit,
|
||
|
|
.cra_ablkcipher = {
|
||
|
|
.min_keysize = AES_MIN_KEY_SIZE,
|
||
|
|
.max_keysize = AES_MAX_KEY_SIZE,
|
||
|
|
.ivsize = 0,
|
||
|
|
.setkey = ablk_set_key,
|
||
|
|
.encrypt = ablk_encrypt,
|
||
|
|
.decrypt = ablk_decrypt,
|
||
|
|
}
|
||
|
|
}, {
|
||
|
|
.cra_name = "cbc(aes)",
|
||
|
|
.cra_driver_name = "cbc-aes-" MODE,
|
||
|
|
.cra_priority = PRIO,
|
||
|
|
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER|CRYPTO_ALG_ASYNC,
|
||
|
|
.cra_blocksize = AES_BLOCK_SIZE,
|
||
|
|
.cra_ctxsize = sizeof(struct async_helper_ctx),
|
||
|
|
.cra_alignmask = 7,
|
||
|
|
.cra_type = &crypto_ablkcipher_type,
|
||
|
|
.cra_module = THIS_MODULE,
|
||
|
|
.cra_init = ablk_init,
|
||
|
|
.cra_exit = ablk_exit,
|
||
|
|
.cra_ablkcipher = {
|
||
|
|
.min_keysize = AES_MIN_KEY_SIZE,
|
||
|
|
.max_keysize = AES_MAX_KEY_SIZE,
|
||
|
|
.ivsize = AES_BLOCK_SIZE,
|
||
|
|
.setkey = ablk_set_key,
|
||
|
|
.encrypt = ablk_encrypt,
|
||
|
|
.decrypt = ablk_decrypt,
|
||
|
|
}
|
||
|
|
}, {
|
||
|
|
.cra_name = "ctr(aes)",
|
||
|
|
.cra_driver_name = "ctr-aes-" MODE,
|
||
|
|
.cra_priority = PRIO,
|
||
|
|
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER|CRYPTO_ALG_ASYNC,
|
||
|
|
.cra_blocksize = 1,
|
||
|
|
.cra_ctxsize = sizeof(struct async_helper_ctx),
|
||
|
|
.cra_alignmask = 7,
|
||
|
|
.cra_type = &crypto_ablkcipher_type,
|
||
|
|
.cra_module = THIS_MODULE,
|
||
|
|
.cra_init = ablk_init,
|
||
|
|
.cra_exit = ablk_exit,
|
||
|
|
.cra_ablkcipher = {
|
||
|
|
.min_keysize = AES_MIN_KEY_SIZE,
|
||
|
|
.max_keysize = AES_MAX_KEY_SIZE,
|
||
|
|
.ivsize = AES_BLOCK_SIZE,
|
||
|
|
.setkey = ablk_set_key,
|
||
|
|
.encrypt = ablk_encrypt,
|
||
|
|
.decrypt = ablk_decrypt,
|
||
|
|
}
|
||
|
|
}, {
|
||
|
|
.cra_name = "xts(aes)",
|
||
|
|
.cra_driver_name = "xts-aes-" MODE,
|
||
|
|
.cra_priority = PRIO,
|
||
|
|
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER|CRYPTO_ALG_ASYNC,
|
||
|
|
.cra_blocksize = AES_BLOCK_SIZE,
|
||
|
|
.cra_ctxsize = sizeof(struct async_helper_ctx),
|
||
|
|
.cra_alignmask = 7,
|
||
|
|
.cra_type = &crypto_ablkcipher_type,
|
||
|
|
.cra_module = THIS_MODULE,
|
||
|
|
.cra_init = ablk_init,
|
||
|
|
.cra_exit = ablk_exit,
|
||
|
|
.cra_ablkcipher = {
|
||
|
|
.min_keysize = 2 * AES_MIN_KEY_SIZE,
|
||
|
|
.max_keysize = 2 * AES_MAX_KEY_SIZE,
|
||
|
|
.ivsize = AES_BLOCK_SIZE,
|
||
|
|
.setkey = ablk_set_key,
|
||
|
|
.encrypt = ablk_encrypt,
|
||
|
|
.decrypt = ablk_decrypt,
|
||
|
|
}
|
||
|
|
} };
|
||
|
|
|
||
|
|
static int __init aes_init(void)
|
||
|
|
{
|
||
|
|
return crypto_register_algs(aes_algs, ARRAY_SIZE(aes_algs));
|
||
|
|
}
|
||
|
|
|
||
|
|
static void __exit aes_exit(void)
|
||
|
|
{
|
||
|
|
crypto_unregister_algs(aes_algs, ARRAY_SIZE(aes_algs));
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef USE_V8_CRYPTO_EXTENSIONS
|
||
|
|
module_cpu_feature_match(AES, aes_init);
|
||
|
|
#else
|
||
|
|
module_init(aes_init);
|
||
|
|
#endif
|
||
|
|
module_exit(aes_exit);
|