255 строки
6.0 KiB
C
255 строки
6.0 KiB
C
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/*
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* sha2-ce-glue.c - SHA-224/SHA-256 using ARMv8 Crypto Extensions
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*
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* Copyright (C) 2014 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/unaligned.h>
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#include <crypto/internal/hash.h>
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#include <crypto/sha.h>
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#include <linux/cpufeature.h>
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#include <linux/crypto.h>
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#include <linux/module.h>
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MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash 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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asmlinkage int sha2_ce_transform(int blocks, u8 const *src, u32 *state,
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u8 *head, long bytes);
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static int sha224_init(struct shash_desc *desc)
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{
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struct sha256_state *sctx = shash_desc_ctx(desc);
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*sctx = (struct sha256_state){
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.state = {
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SHA224_H0, SHA224_H1, SHA224_H2, SHA224_H3,
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SHA224_H4, SHA224_H5, SHA224_H6, SHA224_H7,
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}
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};
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return 0;
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}
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static int sha256_init(struct shash_desc *desc)
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{
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struct sha256_state *sctx = shash_desc_ctx(desc);
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*sctx = (struct sha256_state){
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.state = {
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SHA256_H0, SHA256_H1, SHA256_H2, SHA256_H3,
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SHA256_H4, SHA256_H5, SHA256_H6, SHA256_H7,
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}
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};
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return 0;
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}
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static int sha2_update(struct shash_desc *desc, const u8 *data,
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unsigned int len)
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{
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struct sha256_state *sctx = shash_desc_ctx(desc);
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unsigned int partial = sctx->count % SHA256_BLOCK_SIZE;
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sctx->count += len;
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if ((partial + len) >= SHA256_BLOCK_SIZE) {
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int blocks;
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if (partial) {
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int p = SHA256_BLOCK_SIZE - partial;
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memcpy(sctx->buf + partial, data, p);
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data += p;
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len -= p;
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}
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blocks = len / SHA256_BLOCK_SIZE;
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len %= SHA256_BLOCK_SIZE;
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kernel_neon_begin_partial(28);
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sha2_ce_transform(blocks, data, sctx->state,
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partial ? sctx->buf : NULL, 0);
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kernel_neon_end();
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data += blocks * SHA256_BLOCK_SIZE;
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partial = 0;
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}
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if (len)
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memcpy(sctx->buf + partial, data, len);
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return 0;
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}
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static void sha2_final(struct shash_desc *desc)
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{
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static const u8 padding[SHA256_BLOCK_SIZE] = { 0x80, };
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struct sha256_state *sctx = shash_desc_ctx(desc);
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__be64 bits = cpu_to_be64(sctx->count << 3);
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u32 padlen = SHA256_BLOCK_SIZE
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- ((sctx->count + sizeof(bits)) % SHA256_BLOCK_SIZE);
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sha2_update(desc, padding, padlen);
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sha2_update(desc, (const u8 *)&bits, sizeof(bits));
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}
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static int sha224_final(struct shash_desc *desc, u8 *out)
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{
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struct sha256_state *sctx = shash_desc_ctx(desc);
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__be32 *dst = (__be32 *)out;
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int i;
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sha2_final(desc);
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for (i = 0; i < SHA224_DIGEST_SIZE / sizeof(__be32); i++)
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put_unaligned_be32(sctx->state[i], dst++);
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*sctx = (struct sha256_state){};
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return 0;
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}
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static int sha256_final(struct shash_desc *desc, u8 *out)
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{
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struct sha256_state *sctx = shash_desc_ctx(desc);
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__be32 *dst = (__be32 *)out;
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int i;
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sha2_final(desc);
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for (i = 0; i < SHA256_DIGEST_SIZE / sizeof(__be32); i++)
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put_unaligned_be32(sctx->state[i], dst++);
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*sctx = (struct sha256_state){};
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return 0;
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}
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static void sha2_finup(struct shash_desc *desc, const u8 *data,
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unsigned int len)
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{
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struct sha256_state *sctx = shash_desc_ctx(desc);
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int blocks;
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if (sctx->count || !len || (len % SHA256_BLOCK_SIZE)) {
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sha2_update(desc, data, len);
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sha2_final(desc);
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return;
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}
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/*
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* Use a fast path if the input is a multiple of 64 bytes. In
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* this case, there is no need to copy data around, and we can
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* perform the entire digest calculation in a single invocation
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* of sha2_ce_transform()
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*/
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blocks = len / SHA256_BLOCK_SIZE;
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kernel_neon_begin_partial(28);
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sha2_ce_transform(blocks, data, sctx->state, NULL, len);
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kernel_neon_end();
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}
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static int sha224_finup(struct shash_desc *desc, const u8 *data,
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unsigned int len, u8 *out)
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{
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struct sha256_state *sctx = shash_desc_ctx(desc);
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__be32 *dst = (__be32 *)out;
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int i;
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sha2_finup(desc, data, len);
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for (i = 0; i < SHA224_DIGEST_SIZE / sizeof(__be32); i++)
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put_unaligned_be32(sctx->state[i], dst++);
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*sctx = (struct sha256_state){};
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return 0;
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}
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static int sha256_finup(struct shash_desc *desc, const u8 *data,
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unsigned int len, u8 *out)
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{
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struct sha256_state *sctx = shash_desc_ctx(desc);
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__be32 *dst = (__be32 *)out;
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int i;
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sha2_finup(desc, data, len);
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for (i = 0; i < SHA256_DIGEST_SIZE / sizeof(__be32); i++)
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put_unaligned_be32(sctx->state[i], dst++);
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*sctx = (struct sha256_state){};
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return 0;
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}
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static int sha2_export(struct shash_desc *desc, void *out)
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{
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struct sha256_state *sctx = shash_desc_ctx(desc);
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struct sha256_state *dst = out;
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*dst = *sctx;
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return 0;
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}
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static int sha2_import(struct shash_desc *desc, const void *in)
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{
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struct sha256_state *sctx = shash_desc_ctx(desc);
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struct sha256_state const *src = in;
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*sctx = *src;
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return 0;
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}
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static struct shash_alg algs[] = { {
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.init = sha224_init,
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.update = sha2_update,
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.final = sha224_final,
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.finup = sha224_finup,
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.export = sha2_export,
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.import = sha2_import,
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.descsize = sizeof(struct sha256_state),
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.digestsize = SHA224_DIGEST_SIZE,
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.statesize = sizeof(struct sha256_state),
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.base = {
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.cra_name = "sha224",
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.cra_driver_name = "sha224-ce",
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.cra_priority = 200,
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.cra_flags = CRYPTO_ALG_TYPE_SHASH,
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.cra_blocksize = SHA256_BLOCK_SIZE,
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.cra_module = THIS_MODULE,
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}
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}, {
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.init = sha256_init,
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.update = sha2_update,
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.final = sha256_final,
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.finup = sha256_finup,
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.export = sha2_export,
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.import = sha2_import,
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.descsize = sizeof(struct sha256_state),
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.digestsize = SHA256_DIGEST_SIZE,
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.statesize = sizeof(struct sha256_state),
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.base = {
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.cra_name = "sha256",
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.cra_driver_name = "sha256-ce",
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.cra_priority = 200,
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.cra_flags = CRYPTO_ALG_TYPE_SHASH,
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.cra_blocksize = SHA256_BLOCK_SIZE,
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.cra_module = THIS_MODULE,
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}
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} };
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static int __init sha2_ce_mod_init(void)
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{
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return crypto_register_shashes(algs, ARRAY_SIZE(algs));
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}
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static void __exit sha2_ce_mod_fini(void)
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{
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crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
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}
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module_cpu_feature_match(SHA2, sha2_ce_mod_init);
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module_exit(sha2_ce_mod_fini);
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