| /* |
| * linux/arch/arm64/crypto/aes-glue.c - wrapper code for ARMv8 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 <asm/hwcap.h> |
| #include <crypto/aes.h> |
| #include <crypto/ablk_helper.h> |
| #include <crypto/algapi.h> |
| #include <linux/module.h> |
| #include <linux/cpufeature.h> |
| |
| #include "aes-ce-setkey.h" |
| |
| #ifdef USE_V8_CRYPTO_EXTENSIONS |
| #define MODE "ce" |
| #define PRIO 300 |
| #define aes_setkey ce_aes_setkey |
| #define aes_expandkey ce_aes_expandkey |
| #define aes_ecb_encrypt ce_aes_ecb_encrypt |
| #define aes_ecb_decrypt ce_aes_ecb_decrypt |
| #define aes_cbc_encrypt ce_aes_cbc_encrypt |
| #define aes_cbc_decrypt ce_aes_cbc_decrypt |
| #define aes_ctr_encrypt ce_aes_ctr_encrypt |
| #define aes_xts_encrypt ce_aes_xts_encrypt |
| #define aes_xts_decrypt ce_aes_xts_decrypt |
| MODULE_DESCRIPTION("AES-ECB/CBC/CTR/XTS using ARMv8 Crypto Extensions"); |
| #else |
| #define MODE "neon" |
| #define PRIO 200 |
| #define aes_setkey crypto_aes_set_key |
| #define aes_expandkey crypto_aes_expand_key |
| #define aes_ecb_encrypt neon_aes_ecb_encrypt |
| #define aes_ecb_decrypt neon_aes_ecb_decrypt |
| #define aes_cbc_encrypt neon_aes_cbc_encrypt |
| #define aes_cbc_decrypt neon_aes_cbc_decrypt |
| #define aes_ctr_encrypt neon_aes_ctr_encrypt |
| #define aes_xts_encrypt neon_aes_xts_encrypt |
| #define aes_xts_decrypt neon_aes_xts_decrypt |
| MODULE_DESCRIPTION("AES-ECB/CBC/CTR/XTS using ARMv8 NEON"); |
| MODULE_ALIAS_CRYPTO("ecb(aes)"); |
| MODULE_ALIAS_CRYPTO("cbc(aes)"); |
| MODULE_ALIAS_CRYPTO("ctr(aes)"); |
| MODULE_ALIAS_CRYPTO("xts(aes)"); |
| #endif |
| |
| MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>"); |
| MODULE_LICENSE("GPL v2"); |
| |
| /* defined in aes-modes.S */ |
| asmlinkage void aes_ecb_encrypt(u8 out[], u8 const in[], u8 const rk[], |
| int rounds, int blocks, int first); |
| asmlinkage void aes_ecb_decrypt(u8 out[], u8 const in[], u8 const rk[], |
| int rounds, int blocks, int first); |
| |
| asmlinkage void aes_cbc_encrypt(u8 out[], u8 const in[], u8 const rk[], |
| int rounds, int blocks, u8 iv[], int first); |
| asmlinkage void aes_cbc_decrypt(u8 out[], u8 const in[], u8 const rk[], |
| int rounds, int blocks, u8 iv[], int first); |
| |
| asmlinkage void aes_ctr_encrypt(u8 out[], u8 const in[], u8 const rk[], |
| int rounds, int blocks, u8 ctr[], int first); |
| |
| asmlinkage void aes_xts_encrypt(u8 out[], u8 const in[], u8 const rk1[], |
| int rounds, int blocks, u8 const rk2[], u8 iv[], |
| int first); |
| asmlinkage void aes_xts_decrypt(u8 out[], u8 const in[], u8 const rk1[], |
| int rounds, int blocks, u8 const rk2[], u8 iv[], |
| int first); |
| |
| struct crypto_aes_xts_ctx { |
| struct crypto_aes_ctx key1; |
| struct crypto_aes_ctx __aligned(8) key2; |
| }; |
| |
| static int xts_set_key(struct crypto_tfm *tfm, const u8 *in_key, |
| unsigned int key_len) |
| { |
| struct crypto_aes_xts_ctx *ctx = crypto_tfm_ctx(tfm); |
| int ret; |
| |
| ret = aes_expandkey(&ctx->key1, in_key, key_len / 2); |
| if (!ret) |
| ret = aes_expandkey(&ctx->key2, &in_key[key_len / 2], |
| key_len / 2); |
| if (!ret) |
| return 0; |
| |
| tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN; |
| return -EINVAL; |
| } |
| |
| static int ecb_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst, |
| struct scatterlist *src, unsigned int nbytes) |
| { |
| struct crypto_aes_ctx *ctx = crypto_blkcipher_ctx(desc->tfm); |
| int err, first, rounds = 6 + ctx->key_length / 4; |
| struct blkcipher_walk walk; |
| unsigned int blocks; |
| |
| desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; |
| blkcipher_walk_init(&walk, dst, src, nbytes); |
| err = blkcipher_walk_virt(desc, &walk); |
| |
| kernel_neon_begin(); |
| for (first = 1; (blocks = (walk.nbytes / AES_BLOCK_SIZE)); first = 0) { |
| aes_ecb_encrypt(walk.dst.virt.addr, walk.src.virt.addr, |
| (u8 *)ctx->key_enc, rounds, blocks, first); |
| err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE); |
| } |
| kernel_neon_end(); |
| return err; |
| } |
| |
| static int ecb_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst, |
| struct scatterlist *src, unsigned int nbytes) |
| { |
| struct crypto_aes_ctx *ctx = crypto_blkcipher_ctx(desc->tfm); |
| int err, first, rounds = 6 + ctx->key_length / 4; |
| struct blkcipher_walk walk; |
| unsigned int blocks; |
| |
| desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; |
| blkcipher_walk_init(&walk, dst, src, nbytes); |
| err = blkcipher_walk_virt(desc, &walk); |
| |
| kernel_neon_begin(); |
| for (first = 1; (blocks = (walk.nbytes / AES_BLOCK_SIZE)); first = 0) { |
| aes_ecb_decrypt(walk.dst.virt.addr, walk.src.virt.addr, |
| (u8 *)ctx->key_dec, rounds, blocks, first); |
| err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE); |
| } |
| kernel_neon_end(); |
| return err; |
| } |
| |
| static int cbc_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst, |
| struct scatterlist *src, unsigned int nbytes) |
| { |
| struct crypto_aes_ctx *ctx = crypto_blkcipher_ctx(desc->tfm); |
| int err, first, rounds = 6 + ctx->key_length / 4; |
| struct blkcipher_walk walk; |
| unsigned int blocks; |
| |
| desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; |
| blkcipher_walk_init(&walk, dst, src, nbytes); |
| err = blkcipher_walk_virt(desc, &walk); |
| |
| kernel_neon_begin(); |
| for (first = 1; (blocks = (walk.nbytes / AES_BLOCK_SIZE)); first = 0) { |
| aes_cbc_encrypt(walk.dst.virt.addr, walk.src.virt.addr, |
| (u8 *)ctx->key_enc, rounds, blocks, walk.iv, |
| first); |
| err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE); |
| } |
| kernel_neon_end(); |
| return err; |
| } |
| |
| static int cbc_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst, |
| struct scatterlist *src, unsigned int nbytes) |
| { |
| struct crypto_aes_ctx *ctx = crypto_blkcipher_ctx(desc->tfm); |
| int err, first, rounds = 6 + ctx->key_length / 4; |
| struct blkcipher_walk walk; |
| unsigned int blocks; |
| |
| desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; |
| blkcipher_walk_init(&walk, dst, src, nbytes); |
| err = blkcipher_walk_virt(desc, &walk); |
| |
| kernel_neon_begin(); |
| for (first = 1; (blocks = (walk.nbytes / AES_BLOCK_SIZE)); first = 0) { |
| aes_cbc_decrypt(walk.dst.virt.addr, walk.src.virt.addr, |
| (u8 *)ctx->key_dec, rounds, blocks, walk.iv, |
| first); |
| err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE); |
| } |
| kernel_neon_end(); |
| return err; |
| } |
| |
| static int ctr_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst, |
| struct scatterlist *src, unsigned int nbytes) |
| { |
| struct crypto_aes_ctx *ctx = crypto_blkcipher_ctx(desc->tfm); |
| int err, first, rounds = 6 + ctx->key_length / 4; |
| struct blkcipher_walk walk; |
| int blocks; |
| |
| desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; |
| blkcipher_walk_init(&walk, dst, src, nbytes); |
| err = blkcipher_walk_virt_block(desc, &walk, AES_BLOCK_SIZE); |
| |
| first = 1; |
| kernel_neon_begin(); |
| while ((blocks = (walk.nbytes / AES_BLOCK_SIZE))) { |
| aes_ctr_encrypt(walk.dst.virt.addr, walk.src.virt.addr, |
| (u8 *)ctx->key_enc, rounds, blocks, walk.iv, |
| first); |
| first = 0; |
| nbytes -= blocks * AES_BLOCK_SIZE; |
| if (nbytes && nbytes == walk.nbytes % AES_BLOCK_SIZE) |
| break; |
| err = blkcipher_walk_done(desc, &walk, |
| walk.nbytes % AES_BLOCK_SIZE); |
| } |
| if (nbytes) { |
| u8 *tdst = walk.dst.virt.addr + blocks * AES_BLOCK_SIZE; |
| u8 *tsrc = walk.src.virt.addr + blocks * AES_BLOCK_SIZE; |
| u8 __aligned(8) tail[AES_BLOCK_SIZE]; |
| |
| /* |
| * Minimum alignment is 8 bytes, so if nbytes is <= 8, we need |
| * to tell aes_ctr_encrypt() to only read half a block. |
| */ |
| blocks = (nbytes <= 8) ? -1 : 1; |
| |
| aes_ctr_encrypt(tail, tsrc, (u8 *)ctx->key_enc, rounds, |
| blocks, walk.iv, first); |
| memcpy(tdst, tail, nbytes); |
| err = blkcipher_walk_done(desc, &walk, 0); |
| } |
| kernel_neon_end(); |
| |
| return err; |
| } |
| |
| static int xts_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst, |
| struct scatterlist *src, unsigned int nbytes) |
| { |
| struct crypto_aes_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm); |
| int err, first, rounds = 6 + ctx->key1.key_length / 4; |
| struct blkcipher_walk walk; |
| unsigned int blocks; |
| |
| desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; |
| blkcipher_walk_init(&walk, dst, src, nbytes); |
| err = blkcipher_walk_virt(desc, &walk); |
| |
| kernel_neon_begin(); |
| for (first = 1; (blocks = (walk.nbytes / AES_BLOCK_SIZE)); first = 0) { |
| aes_xts_encrypt(walk.dst.virt.addr, walk.src.virt.addr, |
| (u8 *)ctx->key1.key_enc, rounds, blocks, |
| (u8 *)ctx->key2.key_enc, walk.iv, first); |
| err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE); |
| } |
| kernel_neon_end(); |
| |
| return err; |
| } |
| |
| static int xts_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst, |
| struct scatterlist *src, unsigned int nbytes) |
| { |
| struct crypto_aes_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm); |
| int err, first, rounds = 6 + ctx->key1.key_length / 4; |
| struct blkcipher_walk walk; |
| unsigned int blocks; |
| |
| desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; |
| blkcipher_walk_init(&walk, dst, src, nbytes); |
| err = blkcipher_walk_virt(desc, &walk); |
| |
| kernel_neon_begin(); |
| for (first = 1; (blocks = (walk.nbytes / AES_BLOCK_SIZE)); first = 0) { |
| aes_xts_decrypt(walk.dst.virt.addr, walk.src.virt.addr, |
| (u8 *)ctx->key1.key_dec, rounds, blocks, |
| (u8 *)ctx->key2.key_enc, walk.iv, first); |
| err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE); |
| } |
| kernel_neon_end(); |
| |
| return err; |
| } |
| |
| static struct crypto_alg aes_algs[] = { { |
| .cra_name = "__ecb-aes-" MODE, |
| .cra_driver_name = "__driver-ecb-aes-" MODE, |
| .cra_priority = 0, |
| .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, |
| .cra_blocksize = AES_BLOCK_SIZE, |
| .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 = ecb_encrypt, |
| .decrypt = ecb_decrypt, |
| }, |
| }, { |
| .cra_name = "__cbc-aes-" MODE, |
| .cra_driver_name = "__driver-cbc-aes-" MODE, |
| .cra_priority = 0, |
| .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, |
| .cra_blocksize = AES_BLOCK_SIZE, |
| .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 = cbc_encrypt, |
| .decrypt = cbc_decrypt, |
| }, |
| }, { |
| .cra_name = "__ctr-aes-" MODE, |
| .cra_driver_name = "__driver-ctr-aes-" MODE, |
| .cra_priority = 0, |
| .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, |
| .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, |
| .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 = AES_BLOCK_SIZE, |
| .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); |