~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/include/crypto/sha1_base.h

Version: ~ [ linux-5.6 ] ~ [ linux-5.5.13 ] ~ [ linux-5.4.28 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.113 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.174 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.217 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.217 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.82 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * sha1_base.h - core logic for SHA-1 implementations
  3  *
  4  * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License version 2 as
  8  * published by the Free Software Foundation.
  9  */
 10 
 11 #include <crypto/internal/hash.h>
 12 #include <crypto/sha.h>
 13 #include <linux/crypto.h>
 14 #include <linux/module.h>
 15 
 16 #include <asm/unaligned.h>
 17 
 18 typedef void (sha1_block_fn)(struct sha1_state *sst, u8 const *src, int blocks);
 19 
 20 static inline int sha1_base_init(struct shash_desc *desc)
 21 {
 22         struct sha1_state *sctx = shash_desc_ctx(desc);
 23 
 24         sctx->state[0] = SHA1_H0;
 25         sctx->state[1] = SHA1_H1;
 26         sctx->state[2] = SHA1_H2;
 27         sctx->state[3] = SHA1_H3;
 28         sctx->state[4] = SHA1_H4;
 29         sctx->count = 0;
 30 
 31         return 0;
 32 }
 33 
 34 static inline int sha1_base_do_update(struct shash_desc *desc,
 35                                       const u8 *data,
 36                                       unsigned int len,
 37                                       sha1_block_fn *block_fn)
 38 {
 39         struct sha1_state *sctx = shash_desc_ctx(desc);
 40         unsigned int partial = sctx->count % SHA1_BLOCK_SIZE;
 41 
 42         sctx->count += len;
 43 
 44         if (unlikely((partial + len) >= SHA1_BLOCK_SIZE)) {
 45                 int blocks;
 46 
 47                 if (partial) {
 48                         int p = SHA1_BLOCK_SIZE - partial;
 49 
 50                         memcpy(sctx->buffer + partial, data, p);
 51                         data += p;
 52                         len -= p;
 53 
 54                         block_fn(sctx, sctx->buffer, 1);
 55                 }
 56 
 57                 blocks = len / SHA1_BLOCK_SIZE;
 58                 len %= SHA1_BLOCK_SIZE;
 59 
 60                 if (blocks) {
 61                         block_fn(sctx, data, blocks);
 62                         data += blocks * SHA1_BLOCK_SIZE;
 63                 }
 64                 partial = 0;
 65         }
 66         if (len)
 67                 memcpy(sctx->buffer + partial, data, len);
 68 
 69         return 0;
 70 }
 71 
 72 static inline int sha1_base_do_finalize(struct shash_desc *desc,
 73                                         sha1_block_fn *block_fn)
 74 {
 75         const int bit_offset = SHA1_BLOCK_SIZE - sizeof(__be64);
 76         struct sha1_state *sctx = shash_desc_ctx(desc);
 77         __be64 *bits = (__be64 *)(sctx->buffer + bit_offset);
 78         unsigned int partial = sctx->count % SHA1_BLOCK_SIZE;
 79 
 80         sctx->buffer[partial++] = 0x80;
 81         if (partial > bit_offset) {
 82                 memset(sctx->buffer + partial, 0x0, SHA1_BLOCK_SIZE - partial);
 83                 partial = 0;
 84 
 85                 block_fn(sctx, sctx->buffer, 1);
 86         }
 87 
 88         memset(sctx->buffer + partial, 0x0, bit_offset - partial);
 89         *bits = cpu_to_be64(sctx->count << 3);
 90         block_fn(sctx, sctx->buffer, 1);
 91 
 92         return 0;
 93 }
 94 
 95 static inline int sha1_base_finish(struct shash_desc *desc, u8 *out)
 96 {
 97         struct sha1_state *sctx = shash_desc_ctx(desc);
 98         __be32 *digest = (__be32 *)out;
 99         int i;
100 
101         for (i = 0; i < SHA1_DIGEST_SIZE / sizeof(__be32); i++)
102                 put_unaligned_be32(sctx->state[i], digest++);
103 
104         *sctx = (struct sha1_state){};
105         return 0;
106 }
107 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp