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561 lines
14 KiB
561 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Bit sliced AES using NEON instructions |
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* |
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* Copyright (C) 2016 - 2017 Linaro Ltd <[email protected]> |
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*/ |
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#include <asm/neon.h> |
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#include <asm/simd.h> |
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#include <crypto/aes.h> |
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#include <crypto/ctr.h> |
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#include <crypto/internal/simd.h> |
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#include <crypto/internal/skcipher.h> |
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#include <crypto/scatterwalk.h> |
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#include <crypto/xts.h> |
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#include <linux/module.h> |
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MODULE_AUTHOR("Ard Biesheuvel <[email protected]>"); |
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MODULE_LICENSE("GPL v2"); |
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asmlinkage void aesbs_convert_key(u8 out[], u32 const rk[], int rounds); |
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asmlinkage void aesbs_ecb_encrypt(u8 out[], u8 const in[], u8 const rk[], |
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int rounds, int blocks); |
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asmlinkage void aesbs_ecb_decrypt(u8 out[], u8 const in[], u8 const rk[], |
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int rounds, int blocks); |
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asmlinkage void aesbs_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 aesbs_ctr_encrypt(u8 out[], u8 const in[], u8 const rk[], |
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int rounds, int blocks, u8 iv[], u8 final[]); |
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asmlinkage void aesbs_xts_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 aesbs_xts_decrypt(u8 out[], u8 const in[], u8 const rk[], |
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int rounds, int blocks, u8 iv[]); |
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/* borrowed from aes-neon-blk.ko */ |
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asmlinkage void neon_aes_ecb_encrypt(u8 out[], u8 const in[], u32 const rk[], |
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int rounds, int blocks); |
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asmlinkage void neon_aes_cbc_encrypt(u8 out[], u8 const in[], u32 const rk[], |
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int rounds, int blocks, u8 iv[]); |
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asmlinkage void neon_aes_xts_encrypt(u8 out[], u8 const in[], |
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u32 const rk1[], int rounds, int bytes, |
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u32 const rk2[], u8 iv[], int first); |
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asmlinkage void neon_aes_xts_decrypt(u8 out[], u8 const in[], |
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u32 const rk1[], int rounds, int bytes, |
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u32 const rk2[], u8 iv[], int first); |
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struct aesbs_ctx { |
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u8 rk[13 * (8 * AES_BLOCK_SIZE) + 32]; |
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int rounds; |
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} __aligned(AES_BLOCK_SIZE); |
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struct aesbs_cbc_ctx { |
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struct aesbs_ctx key; |
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u32 enc[AES_MAX_KEYLENGTH_U32]; |
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}; |
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struct aesbs_ctr_ctx { |
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struct aesbs_ctx key; /* must be first member */ |
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struct crypto_aes_ctx fallback; |
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}; |
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struct aesbs_xts_ctx { |
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struct aesbs_ctx key; |
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u32 twkey[AES_MAX_KEYLENGTH_U32]; |
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struct crypto_aes_ctx cts; |
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}; |
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static int aesbs_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 aesbs_ctx *ctx = crypto_skcipher_ctx(tfm); |
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struct crypto_aes_ctx rk; |
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int err; |
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err = aes_expandkey(&rk, in_key, key_len); |
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if (err) |
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return err; |
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ctx->rounds = 6 + key_len / 4; |
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kernel_neon_begin(); |
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aesbs_convert_key(ctx->rk, rk.key_enc, ctx->rounds); |
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kernel_neon_end(); |
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return 0; |
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} |
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static int __ecb_crypt(struct skcipher_request *req, |
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void (*fn)(u8 out[], u8 const in[], u8 const rk[], |
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int rounds, int blocks)) |
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{ |
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); |
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struct aesbs_ctx *ctx = crypto_skcipher_ctx(tfm); |
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struct skcipher_walk walk; |
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int err; |
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err = skcipher_walk_virt(&walk, req, false); |
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while (walk.nbytes >= AES_BLOCK_SIZE) { |
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unsigned int blocks = walk.nbytes / AES_BLOCK_SIZE; |
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if (walk.nbytes < walk.total) |
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blocks = round_down(blocks, |
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walk.stride / AES_BLOCK_SIZE); |
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kernel_neon_begin(); |
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fn(walk.dst.virt.addr, walk.src.virt.addr, ctx->rk, |
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ctx->rounds, blocks); |
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kernel_neon_end(); |
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err = skcipher_walk_done(&walk, |
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walk.nbytes - blocks * AES_BLOCK_SIZE); |
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} |
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return err; |
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} |
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static int ecb_encrypt(struct skcipher_request *req) |
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{ |
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return __ecb_crypt(req, aesbs_ecb_encrypt); |
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} |
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static int ecb_decrypt(struct skcipher_request *req) |
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{ |
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return __ecb_crypt(req, aesbs_ecb_decrypt); |
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} |
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static int aesbs_cbc_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 aesbs_cbc_ctx *ctx = crypto_skcipher_ctx(tfm); |
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struct crypto_aes_ctx rk; |
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int err; |
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err = aes_expandkey(&rk, in_key, key_len); |
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if (err) |
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return err; |
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ctx->key.rounds = 6 + key_len / 4; |
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memcpy(ctx->enc, rk.key_enc, sizeof(ctx->enc)); |
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kernel_neon_begin(); |
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aesbs_convert_key(ctx->key.rk, rk.key_enc, ctx->key.rounds); |
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kernel_neon_end(); |
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memzero_explicit(&rk, sizeof(rk)); |
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return 0; |
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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 aesbs_cbc_ctx *ctx = crypto_skcipher_ctx(tfm); |
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struct skcipher_walk walk; |
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int err; |
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err = skcipher_walk_virt(&walk, req, false); |
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while (walk.nbytes >= AES_BLOCK_SIZE) { |
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unsigned int blocks = walk.nbytes / AES_BLOCK_SIZE; |
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/* fall back to the non-bitsliced NEON implementation */ |
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kernel_neon_begin(); |
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neon_aes_cbc_encrypt(walk.dst.virt.addr, walk.src.virt.addr, |
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ctx->enc, ctx->key.rounds, blocks, |
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walk.iv); |
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kernel_neon_end(); |
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err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE); |
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} |
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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 aesbs_cbc_ctx *ctx = crypto_skcipher_ctx(tfm); |
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struct skcipher_walk walk; |
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int err; |
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err = skcipher_walk_virt(&walk, req, false); |
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while (walk.nbytes >= AES_BLOCK_SIZE) { |
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unsigned int blocks = walk.nbytes / AES_BLOCK_SIZE; |
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if (walk.nbytes < walk.total) |
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blocks = round_down(blocks, |
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walk.stride / AES_BLOCK_SIZE); |
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kernel_neon_begin(); |
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aesbs_cbc_decrypt(walk.dst.virt.addr, walk.src.virt.addr, |
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ctx->key.rk, ctx->key.rounds, blocks, |
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walk.iv); |
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kernel_neon_end(); |
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err = skcipher_walk_done(&walk, |
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walk.nbytes - blocks * AES_BLOCK_SIZE); |
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} |
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return err; |
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} |
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static int aesbs_ctr_setkey_sync(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 aesbs_ctr_ctx *ctx = crypto_skcipher_ctx(tfm); |
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int err; |
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err = aes_expandkey(&ctx->fallback, in_key, key_len); |
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if (err) |
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return err; |
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ctx->key.rounds = 6 + key_len / 4; |
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kernel_neon_begin(); |
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aesbs_convert_key(ctx->key.rk, ctx->fallback.key_enc, ctx->key.rounds); |
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kernel_neon_end(); |
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return 0; |
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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 aesbs_ctx *ctx = crypto_skcipher_ctx(tfm); |
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struct skcipher_walk walk; |
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u8 buf[AES_BLOCK_SIZE]; |
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int err; |
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err = skcipher_walk_virt(&walk, req, false); |
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while (walk.nbytes > 0) { |
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unsigned int blocks = walk.nbytes / AES_BLOCK_SIZE; |
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u8 *final = (walk.total % AES_BLOCK_SIZE) ? buf : NULL; |
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if (walk.nbytes < walk.total) { |
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blocks = round_down(blocks, |
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walk.stride / AES_BLOCK_SIZE); |
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final = NULL; |
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} |
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kernel_neon_begin(); |
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aesbs_ctr_encrypt(walk.dst.virt.addr, walk.src.virt.addr, |
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ctx->rk, ctx->rounds, blocks, walk.iv, final); |
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kernel_neon_end(); |
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if (final) { |
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u8 *dst = walk.dst.virt.addr + blocks * AES_BLOCK_SIZE; |
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u8 *src = walk.src.virt.addr + blocks * AES_BLOCK_SIZE; |
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crypto_xor_cpy(dst, src, final, |
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walk.total % AES_BLOCK_SIZE); |
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err = skcipher_walk_done(&walk, 0); |
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break; |
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} |
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err = skcipher_walk_done(&walk, |
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walk.nbytes - blocks * AES_BLOCK_SIZE); |
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} |
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return err; |
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} |
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static int aesbs_xts_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 aesbs_xts_ctx *ctx = crypto_skcipher_ctx(tfm); |
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struct crypto_aes_ctx rk; |
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int err; |
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err = xts_verify_key(tfm, in_key, key_len); |
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if (err) |
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return err; |
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key_len /= 2; |
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err = aes_expandkey(&ctx->cts, in_key, key_len); |
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if (err) |
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return err; |
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err = aes_expandkey(&rk, in_key + key_len, key_len); |
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if (err) |
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return err; |
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memcpy(ctx->twkey, rk.key_enc, sizeof(ctx->twkey)); |
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return aesbs_setkey(tfm, in_key, key_len); |
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} |
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static void ctr_encrypt_one(struct crypto_skcipher *tfm, const u8 *src, u8 *dst) |
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{ |
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struct aesbs_ctr_ctx *ctx = crypto_skcipher_ctx(tfm); |
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unsigned long flags; |
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/* |
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* Temporarily disable interrupts to avoid races where |
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* cachelines are evicted when the CPU is interrupted |
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* to do something else. |
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*/ |
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local_irq_save(flags); |
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aes_encrypt(&ctx->fallback, dst, src); |
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local_irq_restore(flags); |
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} |
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static int ctr_encrypt_sync(struct skcipher_request *req) |
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{ |
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if (!crypto_simd_usable()) |
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return crypto_ctr_encrypt_walk(req, ctr_encrypt_one); |
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return ctr_encrypt(req); |
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} |
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static int __xts_crypt(struct skcipher_request *req, bool encrypt, |
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void (*fn)(u8 out[], u8 const in[], u8 const rk[], |
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int rounds, int blocks, u8 iv[])) |
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{ |
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); |
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struct aesbs_xts_ctx *ctx = crypto_skcipher_ctx(tfm); |
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int tail = req->cryptlen % (8 * AES_BLOCK_SIZE); |
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struct scatterlist sg_src[2], sg_dst[2]; |
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struct skcipher_request subreq; |
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struct scatterlist *src, *dst; |
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struct skcipher_walk walk; |
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int nbytes, err; |
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int first = 1; |
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u8 *out, *in; |
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if (req->cryptlen < AES_BLOCK_SIZE) |
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return -EINVAL; |
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/* ensure that the cts tail is covered by a single step */ |
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if (unlikely(tail > 0 && tail < AES_BLOCK_SIZE)) { |
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int xts_blocks = DIV_ROUND_UP(req->cryptlen, |
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AES_BLOCK_SIZE) - 2; |
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skcipher_request_set_tfm(&subreq, tfm); |
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skcipher_request_set_callback(&subreq, |
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skcipher_request_flags(req), |
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NULL, NULL); |
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skcipher_request_set_crypt(&subreq, req->src, req->dst, |
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xts_blocks * AES_BLOCK_SIZE, |
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req->iv); |
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req = &subreq; |
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} else { |
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tail = 0; |
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} |
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err = skcipher_walk_virt(&walk, req, false); |
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if (err) |
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return err; |
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while (walk.nbytes >= AES_BLOCK_SIZE) { |
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unsigned int blocks = walk.nbytes / AES_BLOCK_SIZE; |
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if (walk.nbytes < walk.total || walk.nbytes % AES_BLOCK_SIZE) |
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blocks = round_down(blocks, |
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walk.stride / AES_BLOCK_SIZE); |
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out = walk.dst.virt.addr; |
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in = walk.src.virt.addr; |
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nbytes = walk.nbytes; |
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kernel_neon_begin(); |
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if (likely(blocks > 6)) { /* plain NEON is faster otherwise */ |
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if (first) |
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neon_aes_ecb_encrypt(walk.iv, walk.iv, |
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ctx->twkey, |
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ctx->key.rounds, 1); |
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first = 0; |
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fn(out, in, ctx->key.rk, ctx->key.rounds, blocks, |
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walk.iv); |
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out += blocks * AES_BLOCK_SIZE; |
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in += blocks * AES_BLOCK_SIZE; |
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nbytes -= blocks * AES_BLOCK_SIZE; |
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} |
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if (walk.nbytes == walk.total && nbytes > 0) |
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goto xts_tail; |
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kernel_neon_end(); |
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err = skcipher_walk_done(&walk, nbytes); |
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} |
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if (err || likely(!tail)) |
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return err; |
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/* handle ciphertext stealing */ |
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dst = src = scatterwalk_ffwd(sg_src, req->src, req->cryptlen); |
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if (req->dst != req->src) |
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dst = scatterwalk_ffwd(sg_dst, req->dst, req->cryptlen); |
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skcipher_request_set_crypt(req, src, dst, AES_BLOCK_SIZE + tail, |
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req->iv); |
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err = skcipher_walk_virt(&walk, req, false); |
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if (err) |
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return err; |
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out = walk.dst.virt.addr; |
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in = walk.src.virt.addr; |
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nbytes = walk.nbytes; |
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kernel_neon_begin(); |
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xts_tail: |
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if (encrypt) |
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neon_aes_xts_encrypt(out, in, ctx->cts.key_enc, ctx->key.rounds, |
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nbytes, ctx->twkey, walk.iv, first ?: 2); |
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else |
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neon_aes_xts_decrypt(out, in, ctx->cts.key_dec, ctx->key.rounds, |
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nbytes, ctx->twkey, walk.iv, first ?: 2); |
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kernel_neon_end(); |
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return skcipher_walk_done(&walk, 0); |
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} |
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static int xts_encrypt(struct skcipher_request *req) |
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{ |
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return __xts_crypt(req, true, aesbs_xts_encrypt); |
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} |
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static int xts_decrypt(struct skcipher_request *req) |
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{ |
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return __xts_crypt(req, false, aesbs_xts_decrypt); |
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} |
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static struct skcipher_alg aes_algs[] = { { |
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.base.cra_name = "__ecb(aes)", |
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.base.cra_driver_name = "__ecb-aes-neonbs", |
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.base.cra_priority = 250, |
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.base.cra_blocksize = AES_BLOCK_SIZE, |
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.base.cra_ctxsize = sizeof(struct aesbs_ctx), |
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.base.cra_module = THIS_MODULE, |
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.base.cra_flags = CRYPTO_ALG_INTERNAL, |
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.min_keysize = AES_MIN_KEY_SIZE, |
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.max_keysize = AES_MAX_KEY_SIZE, |
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.walksize = 8 * AES_BLOCK_SIZE, |
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.setkey = aesbs_setkey, |
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.encrypt = ecb_encrypt, |
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.decrypt = ecb_decrypt, |
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}, { |
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.base.cra_name = "__cbc(aes)", |
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.base.cra_driver_name = "__cbc-aes-neonbs", |
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.base.cra_priority = 250, |
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.base.cra_blocksize = AES_BLOCK_SIZE, |
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.base.cra_ctxsize = sizeof(struct aesbs_cbc_ctx), |
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.base.cra_module = THIS_MODULE, |
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.base.cra_flags = CRYPTO_ALG_INTERNAL, |
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.min_keysize = AES_MIN_KEY_SIZE, |
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.max_keysize = AES_MAX_KEY_SIZE, |
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.walksize = 8 * AES_BLOCK_SIZE, |
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.ivsize = AES_BLOCK_SIZE, |
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.setkey = aesbs_cbc_setkey, |
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.encrypt = cbc_encrypt, |
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.decrypt = cbc_decrypt, |
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}, { |
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.base.cra_name = "__ctr(aes)", |
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.base.cra_driver_name = "__ctr-aes-neonbs", |
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.base.cra_priority = 250, |
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.base.cra_blocksize = 1, |
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.base.cra_ctxsize = sizeof(struct aesbs_ctx), |
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.base.cra_module = THIS_MODULE, |
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.base.cra_flags = CRYPTO_ALG_INTERNAL, |
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.min_keysize = AES_MIN_KEY_SIZE, |
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.max_keysize = AES_MAX_KEY_SIZE, |
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.chunksize = AES_BLOCK_SIZE, |
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.walksize = 8 * AES_BLOCK_SIZE, |
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.ivsize = AES_BLOCK_SIZE, |
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.setkey = aesbs_setkey, |
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.encrypt = ctr_encrypt, |
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.decrypt = ctr_encrypt, |
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}, { |
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.base.cra_name = "ctr(aes)", |
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.base.cra_driver_name = "ctr-aes-neonbs", |
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.base.cra_priority = 250 - 1, |
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.base.cra_blocksize = 1, |
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.base.cra_ctxsize = sizeof(struct aesbs_ctr_ctx), |
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.base.cra_module = THIS_MODULE, |
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.min_keysize = AES_MIN_KEY_SIZE, |
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.max_keysize = AES_MAX_KEY_SIZE, |
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.chunksize = AES_BLOCK_SIZE, |
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.walksize = 8 * AES_BLOCK_SIZE, |
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.ivsize = AES_BLOCK_SIZE, |
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.setkey = aesbs_ctr_setkey_sync, |
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.encrypt = ctr_encrypt_sync, |
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.decrypt = ctr_encrypt_sync, |
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}, { |
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.base.cra_name = "__xts(aes)", |
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.base.cra_driver_name = "__xts-aes-neonbs", |
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.base.cra_priority = 250, |
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.base.cra_blocksize = AES_BLOCK_SIZE, |
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.base.cra_ctxsize = sizeof(struct aesbs_xts_ctx), |
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.base.cra_module = THIS_MODULE, |
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.base.cra_flags = CRYPTO_ALG_INTERNAL, |
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.min_keysize = 2 * AES_MIN_KEY_SIZE, |
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.max_keysize = 2 * AES_MAX_KEY_SIZE, |
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.walksize = 8 * AES_BLOCK_SIZE, |
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.ivsize = AES_BLOCK_SIZE, |
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.setkey = aesbs_xts_setkey, |
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.encrypt = xts_encrypt, |
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.decrypt = xts_decrypt, |
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} }; |
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static struct simd_skcipher_alg *aes_simd_algs[ARRAY_SIZE(aes_algs)]; |
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static void aes_exit(void) |
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{ |
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int i; |
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for (i = 0; i < ARRAY_SIZE(aes_simd_algs); i++) |
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if (aes_simd_algs[i]) |
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simd_skcipher_free(aes_simd_algs[i]); |
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crypto_unregister_skciphers(aes_algs, ARRAY_SIZE(aes_algs)); |
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} |
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static int __init aes_init(void) |
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{ |
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struct simd_skcipher_alg *simd; |
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const char *basename; |
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const char *algname; |
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const char *drvname; |
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int err; |
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int i; |
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if (!cpu_have_named_feature(ASIMD)) |
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return -ENODEV; |
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err = crypto_register_skciphers(aes_algs, ARRAY_SIZE(aes_algs)); |
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if (err) |
|
return err; |
|
|
|
for (i = 0; i < ARRAY_SIZE(aes_algs); i++) { |
|
if (!(aes_algs[i].base.cra_flags & CRYPTO_ALG_INTERNAL)) |
|
continue; |
|
|
|
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_init(aes_init); |
|
module_exit(aes_exit);
|
|
|