commit 83f2bd11ce4f08a05e1f2245d71625879e89cbb9
parent 25c3efcbe35fe7262ea360f0d5d988585e02f4a9
Author: sin <sin@2f30.org>
Date: Thu, 22 Mar 2018 10:31:36 +0000
Drop dependency on OpenSSL
Diffstat:
| M | Makefile | | | 8 | ++++---- |
| M | dedup.c | | | 37 | +++++++++++++++++++------------------ |
| A | sha256.c | | | 261 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | sha256.h | | | 24 | ++++++++++++++++++++++++ |
4 files changed, 308 insertions(+), 22 deletions(-)
diff --git a/Makefile b/Makefile
@@ -1,18 +1,18 @@
VERSION = 0.0
PREFIX = /usr/local
MANPREFIX = $(PREFIX)/man
-SRC = dedup.c
-OBJ = dedup.o
+SRC = dedup.c sha256.c
+OBJ = dedup.o sha256.o
BIN = dedup
DISTFILES = $(SRC) LICENSE Makefile README arg.h dedup.1 tree.h
CFLAGS = -g -Wall
CPPFLAGS = -I/usr/local/include
-LDLIBS = -lcrypto
all: $(BIN)
-dedup.o: arg.h tree.h
+dedup.o: arg.h sha256.h tree.h
+sha256.o: sha256.h
clean:
rm -f $(OBJ) $(BIN) $(BIN)-$(VERSION).tar.gz
diff --git a/dedup.c b/dedup.c
@@ -6,8 +6,9 @@
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
-#include <openssl/sha.h>
+
#include "arg.h"
+#include "sha256.h"
#include "tree.h"
#define INDEXF ".index"
@@ -24,19 +25,19 @@ struct enthdr {
struct ent {
uint64_t sz; /* size of entire entry structure */
unsigned char reserved[7];
- unsigned char md[SHA256_DIGEST_LENGTH];
+ unsigned char md[32];
uint64_t nblks;
uint64_t blks[];
} __attribute__((packed));
struct blk {
- unsigned char md[SHA256_DIGEST_LENGTH];
+ unsigned char md[32];
uint64_t sz;
unsigned char data[BLKSIZ];
} __attribute__((packed));
struct cache_data {
- unsigned char md[SHA256_DIGEST_LENGTH];
+ unsigned char md[32];
uint64_t blkidx;
} __attribute__((packed));
@@ -270,11 +271,11 @@ cachefile_nblks(void)
void
hash_blk(struct blk *blk)
{
- SHA256_CTX ctx;
+ sha256_context ctx;
- SHA256_Init(&ctx);
- SHA256_Update(&ctx, blk->data, blk->sz);
- SHA256_Final(blk->md, &ctx);
+ sha256_starts(&ctx);
+ sha256_update(&ctx, blk->data, blk->sz);
+ sha256_finish(&ctx, blk->md);
}
void
@@ -309,7 +310,7 @@ lookup_blk(struct blk *blk, uint64_t *blkidx)
void
extract(char *id, int fd)
{
- unsigned char md[SHA256_DIGEST_LENGTH];
+ unsigned char md[32];
uint64_t nblks, i;
str2bin(id, md);
@@ -357,13 +358,13 @@ extract(char *id, int fd)
void
dedup(int fd)
{
+ sha256_context ctx;
struct blk blk;
struct ent *ent;
- SHA256_CTX ctx;
ssize_t n;
ent = alloc_ent();
- SHA256_Init(&ctx);
+ sha256_starts(&ctx);
while ((n = xread(fd, blk.data, BLKSIZ)) > 0) {
uint64_t blkidx;
@@ -371,7 +372,7 @@ dedup(int fd)
hash_blk(&blk);
/* Rolling hash of input stream */
- SHA256_Update(&ctx, blk.data, blk.sz);
+ sha256_update(&ctx, blk.data, blk.sz);
/* Prepare for adding a new block index for this entry */
ent = grow_ent(ent, ent->nblks + 1);
@@ -394,7 +395,7 @@ dedup(int fd)
if (ent->nblks > 0) {
/* Calculate hash and add this entry to the index */
- SHA256_Final(ent->md, &ctx);
+ sha256_finish(&ctx, ent->md);
append_ent(ent);
}
free(ent);
@@ -410,8 +411,8 @@ check(void)
nblks = storefile_nblks();
lseek(ifd, sizeof(enthdr), SEEK_SET);
for (i = 0; i < enthdr.nents; i++) {
- unsigned char md[SHA256_DIGEST_LENGTH];
- SHA256_CTX ctx;
+ unsigned char md[32];
+ sha256_context ctx;
struct ent *ent;
ent = alloc_ent();
@@ -422,16 +423,16 @@ check(void)
ent->nblks * sizeof(ent->blks[0])) == 0)
errx(1, "unexpected EOF");
- SHA256_Init(&ctx);
+ sha256_starts(&ctx);
for (j = 0; j < ent->nblks; j++) {
struct blk blk;
if (ent->blks[j] > nblks)
errx(1, "index is corrupted");
read_blk(&blk, ent->blks[j]);
- SHA256_Update(&ctx, blk.data, blk.sz);
+ sha256_update(&ctx, blk.data, blk.sz);
}
- SHA256_Final(md, &ctx);
+ sha256_finish(&ctx, md);
if (memcmp(ent->md, md, sizeof(ent->md)) != 0)
errx(1, "hash mismatch");
diff --git a/sha256.c b/sha256.c
@@ -0,0 +1,261 @@
+/*
+ * FIPS-180-2 compliant SHA-256 implementation
+ *
+ * Copyright (C) 2001-2003 Christophe Devine
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <string.h>
+
+#include "sha256.h"
+
+#define GET_UINT32(n,b,i) \
+{ \
+ (n) = ( (uint32) (b)[(i) ] << 24 ) \
+ | ( (uint32) (b)[(i) + 1] << 16 ) \
+ | ( (uint32) (b)[(i) + 2] << 8 ) \
+ | ( (uint32) (b)[(i) + 3] ); \
+}
+
+#define PUT_UINT32(n,b,i) \
+{ \
+ (b)[(i) ] = (uint8) ( (n) >> 24 ); \
+ (b)[(i) + 1] = (uint8) ( (n) >> 16 ); \
+ (b)[(i) + 2] = (uint8) ( (n) >> 8 ); \
+ (b)[(i) + 3] = (uint8) ( (n) ); \
+}
+
+void sha256_starts( sha256_context *ctx )
+{
+ ctx->total[0] = 0;
+ ctx->total[1] = 0;
+
+ ctx->state[0] = 0x6A09E667;
+ ctx->state[1] = 0xBB67AE85;
+ ctx->state[2] = 0x3C6EF372;
+ ctx->state[3] = 0xA54FF53A;
+ ctx->state[4] = 0x510E527F;
+ ctx->state[5] = 0x9B05688C;
+ ctx->state[6] = 0x1F83D9AB;
+ ctx->state[7] = 0x5BE0CD19;
+}
+
+void sha256_process( sha256_context *ctx, uint8 data[64] )
+{
+ uint32 temp1, temp2, W[64];
+ uint32 A, B, C, D, E, F, G, H;
+
+ GET_UINT32( W[0], data, 0 );
+ GET_UINT32( W[1], data, 4 );
+ GET_UINT32( W[2], data, 8 );
+ GET_UINT32( W[3], data, 12 );
+ GET_UINT32( W[4], data, 16 );
+ GET_UINT32( W[5], data, 20 );
+ GET_UINT32( W[6], data, 24 );
+ GET_UINT32( W[7], data, 28 );
+ GET_UINT32( W[8], data, 32 );
+ GET_UINT32( W[9], data, 36 );
+ GET_UINT32( W[10], data, 40 );
+ GET_UINT32( W[11], data, 44 );
+ GET_UINT32( W[12], data, 48 );
+ GET_UINT32( W[13], data, 52 );
+ GET_UINT32( W[14], data, 56 );
+ GET_UINT32( W[15], data, 60 );
+
+#define SHR(x,n) ((x & 0xFFFFFFFF) >> n)
+#define ROTR(x,n) (SHR(x,n) | (x << (32 - n)))
+
+#define S0(x) (ROTR(x, 7) ^ ROTR(x,18) ^ SHR(x, 3))
+#define S1(x) (ROTR(x,17) ^ ROTR(x,19) ^ SHR(x,10))
+
+#define S2(x) (ROTR(x, 2) ^ ROTR(x,13) ^ ROTR(x,22))
+#define S3(x) (ROTR(x, 6) ^ ROTR(x,11) ^ ROTR(x,25))
+
+#define F0(x,y,z) ((x & y) | (z & (x | y)))
+#define F1(x,y,z) (z ^ (x & (y ^ z)))
+
+#define R(t) \
+( \
+ W[t] = S1(W[t - 2]) + W[t - 7] + \
+ S0(W[t - 15]) + W[t - 16] \
+)
+
+#define P(a,b,c,d,e,f,g,h,x,K) \
+{ \
+ temp1 = h + S3(e) + F1(e,f,g) + K + x; \
+ temp2 = S2(a) + F0(a,b,c); \
+ d += temp1; h = temp1 + temp2; \
+}
+
+ A = ctx->state[0];
+ B = ctx->state[1];
+ C = ctx->state[2];
+ D = ctx->state[3];
+ E = ctx->state[4];
+ F = ctx->state[5];
+ G = ctx->state[6];
+ H = ctx->state[7];
+
+ P( A, B, C, D, E, F, G, H, W[ 0], 0x428A2F98 );
+ P( H, A, B, C, D, E, F, G, W[ 1], 0x71374491 );
+ P( G, H, A, B, C, D, E, F, W[ 2], 0xB5C0FBCF );
+ P( F, G, H, A, B, C, D, E, W[ 3], 0xE9B5DBA5 );
+ P( E, F, G, H, A, B, C, D, W[ 4], 0x3956C25B );
+ P( D, E, F, G, H, A, B, C, W[ 5], 0x59F111F1 );
+ P( C, D, E, F, G, H, A, B, W[ 6], 0x923F82A4 );
+ P( B, C, D, E, F, G, H, A, W[ 7], 0xAB1C5ED5 );
+ P( A, B, C, D, E, F, G, H, W[ 8], 0xD807AA98 );
+ P( H, A, B, C, D, E, F, G, W[ 9], 0x12835B01 );
+ P( G, H, A, B, C, D, E, F, W[10], 0x243185BE );
+ P( F, G, H, A, B, C, D, E, W[11], 0x550C7DC3 );
+ P( E, F, G, H, A, B, C, D, W[12], 0x72BE5D74 );
+ P( D, E, F, G, H, A, B, C, W[13], 0x80DEB1FE );
+ P( C, D, E, F, G, H, A, B, W[14], 0x9BDC06A7 );
+ P( B, C, D, E, F, G, H, A, W[15], 0xC19BF174 );
+ P( A, B, C, D, E, F, G, H, R(16), 0xE49B69C1 );
+ P( H, A, B, C, D, E, F, G, R(17), 0xEFBE4786 );
+ P( G, H, A, B, C, D, E, F, R(18), 0x0FC19DC6 );
+ P( F, G, H, A, B, C, D, E, R(19), 0x240CA1CC );
+ P( E, F, G, H, A, B, C, D, R(20), 0x2DE92C6F );
+ P( D, E, F, G, H, A, B, C, R(21), 0x4A7484AA );
+ P( C, D, E, F, G, H, A, B, R(22), 0x5CB0A9DC );
+ P( B, C, D, E, F, G, H, A, R(23), 0x76F988DA );
+ P( A, B, C, D, E, F, G, H, R(24), 0x983E5152 );
+ P( H, A, B, C, D, E, F, G, R(25), 0xA831C66D );
+ P( G, H, A, B, C, D, E, F, R(26), 0xB00327C8 );
+ P( F, G, H, A, B, C, D, E, R(27), 0xBF597FC7 );
+ P( E, F, G, H, A, B, C, D, R(28), 0xC6E00BF3 );
+ P( D, E, F, G, H, A, B, C, R(29), 0xD5A79147 );
+ P( C, D, E, F, G, H, A, B, R(30), 0x06CA6351 );
+ P( B, C, D, E, F, G, H, A, R(31), 0x14292967 );
+ P( A, B, C, D, E, F, G, H, R(32), 0x27B70A85 );
+ P( H, A, B, C, D, E, F, G, R(33), 0x2E1B2138 );
+ P( G, H, A, B, C, D, E, F, R(34), 0x4D2C6DFC );
+ P( F, G, H, A, B, C, D, E, R(35), 0x53380D13 );
+ P( E, F, G, H, A, B, C, D, R(36), 0x650A7354 );
+ P( D, E, F, G, H, A, B, C, R(37), 0x766A0ABB );
+ P( C, D, E, F, G, H, A, B, R(38), 0x81C2C92E );
+ P( B, C, D, E, F, G, H, A, R(39), 0x92722C85 );
+ P( A, B, C, D, E, F, G, H, R(40), 0xA2BFE8A1 );
+ P( H, A, B, C, D, E, F, G, R(41), 0xA81A664B );
+ P( G, H, A, B, C, D, E, F, R(42), 0xC24B8B70 );
+ P( F, G, H, A, B, C, D, E, R(43), 0xC76C51A3 );
+ P( E, F, G, H, A, B, C, D, R(44), 0xD192E819 );
+ P( D, E, F, G, H, A, B, C, R(45), 0xD6990624 );
+ P( C, D, E, F, G, H, A, B, R(46), 0xF40E3585 );
+ P( B, C, D, E, F, G, H, A, R(47), 0x106AA070 );
+ P( A, B, C, D, E, F, G, H, R(48), 0x19A4C116 );
+ P( H, A, B, C, D, E, F, G, R(49), 0x1E376C08 );
+ P( G, H, A, B, C, D, E, F, R(50), 0x2748774C );
+ P( F, G, H, A, B, C, D, E, R(51), 0x34B0BCB5 );
+ P( E, F, G, H, A, B, C, D, R(52), 0x391C0CB3 );
+ P( D, E, F, G, H, A, B, C, R(53), 0x4ED8AA4A );
+ P( C, D, E, F, G, H, A, B, R(54), 0x5B9CCA4F );
+ P( B, C, D, E, F, G, H, A, R(55), 0x682E6FF3 );
+ P( A, B, C, D, E, F, G, H, R(56), 0x748F82EE );
+ P( H, A, B, C, D, E, F, G, R(57), 0x78A5636F );
+ P( G, H, A, B, C, D, E, F, R(58), 0x84C87814 );
+ P( F, G, H, A, B, C, D, E, R(59), 0x8CC70208 );
+ P( E, F, G, H, A, B, C, D, R(60), 0x90BEFFFA );
+ P( D, E, F, G, H, A, B, C, R(61), 0xA4506CEB );
+ P( C, D, E, F, G, H, A, B, R(62), 0xBEF9A3F7 );
+ P( B, C, D, E, F, G, H, A, R(63), 0xC67178F2 );
+
+ ctx->state[0] += A;
+ ctx->state[1] += B;
+ ctx->state[2] += C;
+ ctx->state[3] += D;
+ ctx->state[4] += E;
+ ctx->state[5] += F;
+ ctx->state[6] += G;
+ ctx->state[7] += H;
+}
+
+void sha256_update( sha256_context *ctx, uint8 *input, uint32 length )
+{
+ uint32 left, fill;
+
+ if( ! length ) return;
+
+ left = ctx->total[0] & 0x3F;
+ fill = 64 - left;
+
+ ctx->total[0] += length;
+ ctx->total[0] &= 0xFFFFFFFF;
+
+ if( ctx->total[0] < length )
+ ctx->total[1]++;
+
+ if( left && length >= fill )
+ {
+ memcpy( (void *) (ctx->buffer + left),
+ (void *) input, fill );
+ sha256_process( ctx, ctx->buffer );
+ length -= fill;
+ input += fill;
+ left = 0;
+ }
+
+ while( length >= 64 )
+ {
+ sha256_process( ctx, input );
+ length -= 64;
+ input += 64;
+ }
+
+ if( length )
+ {
+ memcpy( (void *) (ctx->buffer + left),
+ (void *) input, length );
+ }
+}
+
+static uint8 sha256_padding[64] =
+{
+ 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
+};
+
+void sha256_finish( sha256_context *ctx, uint8 digest[32] )
+{
+ uint32 last, padn;
+ uint32 high, low;
+ uint8 msglen[8];
+
+ high = ( ctx->total[0] >> 29 )
+ | ( ctx->total[1] << 3 );
+ low = ( ctx->total[0] << 3 );
+
+ PUT_UINT32( high, msglen, 0 );
+ PUT_UINT32( low, msglen, 4 );
+
+ last = ctx->total[0] & 0x3F;
+ padn = ( last < 56 ) ? ( 56 - last ) : ( 120 - last );
+
+ sha256_update( ctx, sha256_padding, padn );
+ sha256_update( ctx, msglen, 8 );
+
+ PUT_UINT32( ctx->state[0], digest, 0 );
+ PUT_UINT32( ctx->state[1], digest, 4 );
+ PUT_UINT32( ctx->state[2], digest, 8 );
+ PUT_UINT32( ctx->state[3], digest, 12 );
+ PUT_UINT32( ctx->state[4], digest, 16 );
+ PUT_UINT32( ctx->state[5], digest, 20 );
+ PUT_UINT32( ctx->state[6], digest, 24 );
+ PUT_UINT32( ctx->state[7], digest, 28 );
+}
diff --git a/sha256.h b/sha256.h
@@ -0,0 +1,24 @@
+#ifndef _SHA256_H
+#define _SHA256_H
+
+#ifndef uint8
+#define uint8 unsigned char
+#endif
+
+#ifndef uint32
+#define uint32 unsigned long int
+#endif
+
+typedef struct
+{
+ uint32 total[2];
+ uint32 state[8];
+ uint8 buffer[64];
+}
+sha256_context;
+
+void sha256_starts( sha256_context *ctx );
+void sha256_update( sha256_context *ctx, uint8 *input, uint32 length );
+void sha256_finish( sha256_context *ctx, uint8 digest[32] );
+
+#endif /* sha256.h */
