cregit-Linux how code gets into the kernel

Release 4.12 include/crypto/sha1_base.h

Directory: include/crypto
/*
 * sha1_base.h - core logic for SHA-1 implementations
 *
 * Copyright (C) 2015 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 <crypto/internal/hash.h>
#include <crypto/sha.h>
#include <linux/crypto.h>
#include <linux/module.h>

#include <asm/unaligned.h>


typedef void (sha1_block_fn)(struct sha1_state *sst, u8 const *src, int blocks);


static inline int sha1_base_init(struct shash_desc *desc) { struct sha1_state *sctx = shash_desc_ctx(desc); sctx->state[0] = SHA1_H0; sctx->state[1] = SHA1_H1; sctx->state[2] = SHA1_H2; sctx->state[3] = SHA1_H3; sctx->state[4] = SHA1_H4; sctx->count = 0; return 0; }

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static inline int sha1_base_do_update(struct shash_desc *desc, const u8 *data, unsigned int len, sha1_block_fn *block_fn) { struct sha1_state *sctx = shash_desc_ctx(desc); unsigned int partial = sctx->count % SHA1_BLOCK_SIZE; sctx->count += len; if (unlikely((partial + len) >= SHA1_BLOCK_SIZE)) { int blocks; if (partial) { int p = SHA1_BLOCK_SIZE - partial; memcpy(sctx->buffer + partial, data, p); data += p; len -= p; block_fn(sctx, sctx->buffer, 1); } blocks = len / SHA1_BLOCK_SIZE; len %= SHA1_BLOCK_SIZE; if (blocks) { block_fn(sctx, data, blocks); data += blocks * SHA1_BLOCK_SIZE; } partial = 0; } if (len) memcpy(sctx->buffer + partial, data, len); return 0; }

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static inline int sha1_base_do_finalize(struct shash_desc *desc, sha1_block_fn *block_fn) { const int bit_offset = SHA1_BLOCK_SIZE - sizeof(__be64); struct sha1_state *sctx = shash_desc_ctx(desc); __be64 *bits = (__be64 *)(sctx->buffer + bit_offset); unsigned int partial = sctx->count % SHA1_BLOCK_SIZE; sctx->buffer[partial++] = 0x80; if (partial > bit_offset) { memset(sctx->buffer + partial, 0x0, SHA1_BLOCK_SIZE - partial); partial = 0; block_fn(sctx, sctx->buffer, 1); } memset(sctx->buffer + partial, 0x0, bit_offset - partial); *bits = cpu_to_be64(sctx->count << 3); block_fn(sctx, sctx->buffer, 1); return 0; }

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static inline int sha1_base_finish(struct shash_desc *desc, u8 *out) { struct sha1_state *sctx = shash_desc_ctx(desc); __be32 *digest = (__be32 *)out; int i; for (i = 0; i < SHA1_DIGEST_SIZE / sizeof(__be32); i++) put_unaligned_be32(sctx->state[i], digest++); *sctx = (struct sha1_state){}; return 0; }

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Directory: include/crypto
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