VeraCrypt
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+/* Deprecated/legacy */
+
+/*
+ ---------------------------------------------------------------------------
+ Copyright (c) 2002, Dr Brian Gladman, Worcester, UK. All rights reserved.
+
+ LICENSE TERMS
+
+ The free distribution and use of this software is allowed (with or without
+ changes) provided that:
+
+ 1. source code distributions include the above copyright notice, this
+ list of conditions and the following disclaimer;
+
+ 2. binary distributions include the above copyright notice, this list
+ of conditions and the following disclaimer in their documentation;
+
+ 3. the name of the copyright holder is not used to endorse products
+ built using this software without specific written permission.
+
+ DISCLAIMER
+
+ This software is provided 'as is' with no explicit or implied warranties
+ in respect of its properties, including, but not limited to, correctness
+ and/or fitness for purpose.
+ ---------------------------------------------------------------------------
+ Issue Date: 18/06/2004
+
+ This is a byte oriented version of SHA1 that operates on arrays of bytes
+ stored in memory.
+*/
+
+/* Adapted for TrueCrypt */
+
+#include <string.h> /* for memcpy() etc. */
+#include <stdlib.h> /* for _lrotl with VC++ */
+
+#include "Sha1.h"
+
+#if defined(__cplusplus)
+extern "C"
+{
+#endif
+
+/*
+ To obtain the highest speed on processors with 32-bit words, this code
+ needs to determine the order in which bytes are packed into such words.
+ The following block of code is an attempt to capture the most obvious
+ ways in which various environemnts specify their endian definitions.
+ It may well fail, in which case the definitions will need to be set by
+ editing at the points marked **** EDIT HERE IF NECESSARY **** below.
+*/
+
+/* PLATFORM SPECIFIC INCLUDES */
+
+/* Original byte order detection removed */
+#include "../Common/Endian.h"
+
+#define BRG_LITTLE_ENDIAN 1234 /* byte 0 is least significant (i386) */
+#define BRG_BIG_ENDIAN 4321 /* byte 0 is most significant (mc68k) */
+
+#if BYTE_ORDER == LITTLE_ENDIAN
+# define PLATFORM_BYTE_ORDER BRG_LITTLE_ENDIAN
+#endif
+
+#if BYTE_ORDER == BIG_ENDIAN
+# define PLATFORM_BYTE_ORDER BRG_BIG_ENDIAN
+#endif
+
+#ifdef _MSC_VER
+#pragma intrinsic(memcpy)
+#endif
+
+#if 1 && defined(_MSC_VER) && !defined(_DEBUG)
+#define rotl32 _rotl
+#define rotr32 _rotr
+#else
+#define rotl32(x,n) (((x) << n) | ((x) >> (32 - n)))
+#define rotr32(x,n) (((x) >> n) | ((x) << (32 - n)))
+#endif
+
+#if !defined(bswap_32)
+#define bswap_32(x) ((rotr32((x), 24) & 0x00ff00ff) | (rotr32((x), 8) & 0xff00ff00))
+#endif
+
+#if (PLATFORM_BYTE_ORDER == BRG_LITTLE_ENDIAN)
+#define SWAP_BYTES
+#else
+#undef SWAP_BYTES
+#endif
+
+#if defined(SWAP_BYTES)
+#define bsw_32(p,n) \
+ { int _i = (n); while(_i--) ((sha1_32t*)p)[_i] = bswap_32(((sha1_32t*)p)[_i]); }
+#else
+#define bsw_32(p,n)
+#endif
+
+#define SHA1_MASK (SHA1_BLOCK_SIZE - 1)
+
+#if 0
+
+#define ch(x,y,z) (((x) & (y)) ^ (~(x) & (z)))
+#define parity(x,y,z) ((x) ^ (y) ^ (z))
+#define maj(x,y,z) (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
+
+#else /* Discovered by Rich Schroeppel and Colin Plumb */
+
+#define ch(x,y,z) ((z) ^ ((x) & ((y) ^ (z))))
+#define parity(x,y,z) ((x) ^ (y) ^ (z))
+#define maj(x,y,z) (((x) & (y)) | ((z) & ((x) ^ (y))))
+
+#endif
+
+/* Compile 64 bytes of hash data into SHA1 context. Note */
+/* that this routine assumes that the byte order in the */
+/* ctx->wbuf[] at this point is in such an order that low */
+/* address bytes in the ORIGINAL byte stream will go in */
+/* this buffer to the high end of 32-bit words on BOTH big */
+/* and little endian systems */
+
+#ifdef ARRAY
+#define q(v,n) v[n]
+#else
+#define q(v,n) v##n
+#endif
+
+#define one_cycle(v,a,b,c,d,e,f,k,h) \
+ q(v,e) += rotr32(q(v,a),27) + \
+ f(q(v,b),q(v,c),q(v,d)) + k + h; \
+ q(v,b) = rotr32(q(v,b), 2)
+
+#define five_cycle(v,f,k,i) \
+ one_cycle(v, 0,1,2,3,4, f,k,hf(i )); \
+ one_cycle(v, 4,0,1,2,3, f,k,hf(i+1)); \
+ one_cycle(v, 3,4,0,1,2, f,k,hf(i+2)); \
+ one_cycle(v, 2,3,4,0,1, f,k,hf(i+3)); \
+ one_cycle(v, 1,2,3,4,0, f,k,hf(i+4))
+
+void sha1_compile(sha1_ctx ctx[1])
+{ sha1_32t *w = ctx->wbuf;
+
+#ifdef ARRAY
+ sha1_32t v[5];
+ memcpy(v, ctx->hash, 5 * sizeof(sha1_32t));
+#else
+ sha1_32t v0, v1, v2, v3, v4;
+ v0 = ctx->hash[0]; v1 = ctx->hash[1];
+ v2 = ctx->hash[2]; v3 = ctx->hash[3];
+ v4 = ctx->hash[4];
+#endif
+
+#define hf(i) w[i]
+
+ five_cycle(v, ch, 0x5a827999, 0);
+ five_cycle(v, ch, 0x5a827999, 5);
+ five_cycle(v, ch, 0x5a827999, 10);
+ one_cycle(v,0,1,2,3,4, ch, 0x5a827999, hf(15)); \
+
+#undef hf
+#define hf(i) (w[(i) & 15] = rotl32( \
+ w[((i) + 13) & 15] ^ w[((i) + 8) & 15] \
+ ^ w[((i) + 2) & 15] ^ w[(i) & 15], 1))
+
+ one_cycle(v,4,0,1,2,3, ch, 0x5a827999, hf(16));
+ one_cycle(v,3,4,0,1,2, ch, 0x5a827999, hf(17));
+ one_cycle(v,2,3,4,0,1, ch, 0x5a827999, hf(18));
+ one_cycle(v,1,2,3,4,0, ch, 0x5a827999, hf(19));
+
+ five_cycle(v, parity, 0x6ed9eba1, 20);
+ five_cycle(v, parity, 0x6ed9eba1, 25);
+ five_cycle(v, parity, 0x6ed9eba1, 30);
+ five_cycle(v, parity, 0x6ed9eba1, 35);
+
+ five_cycle(v, maj, 0x8f1bbcdc, 40);
+ five_cycle(v, maj, 0x8f1bbcdc, 45);
+ five_cycle(v, maj, 0x8f1bbcdc, 50);
+ five_cycle(v, maj, 0x8f1bbcdc, 55);
+
+ five_cycle(v, parity, 0xca62c1d6, 60);
+ five_cycle(v, parity, 0xca62c1d6, 65);
+ five_cycle(v, parity, 0xca62c1d6, 70);
+ five_cycle(v, parity, 0xca62c1d6, 75);
+
+#ifdef ARRAY
+ ctx->hash[0] += v[0]; ctx->hash[1] += v[1];
+ ctx->hash[2] += v[2]; ctx->hash[3] += v[3];
+ ctx->hash[4] += v[4];
+#else
+ ctx->hash[0] += v0; ctx->hash[1] += v1;
+ ctx->hash[2] += v2; ctx->hash[3] += v3;
+ ctx->hash[4] += v4;
+#endif
+}
+
+void sha1_begin(sha1_ctx ctx[1])
+{
+ ctx->count[0] = ctx->count[1] = 0;
+ ctx->hash[0] = 0x67452301;
+ ctx->hash[1] = 0xefcdab89;
+ ctx->hash[2] = 0x98badcfe;
+ ctx->hash[3] = 0x10325476;
+ ctx->hash[4] = 0xc3d2e1f0;
+}
+
+/* SHA1 hash data in an array of bytes into hash buffer and */
+/* call the hash_compile function as required. */
+
+void sha1_hash(const unsigned char data[], unsigned __int32 len, sha1_ctx ctx[1])
+{ sha1_32t pos = (sha1_32t)(ctx->count[0] & SHA1_MASK),
+ space = SHA1_BLOCK_SIZE - pos;
+ const unsigned char *sp = data;
+
+ if((ctx->count[0] += len) < len)
+ ++(ctx->count[1]);
+
+ while(len >= space) /* tranfer whole blocks if possible */
+ {
+ memcpy(((unsigned char*)ctx->wbuf) + pos, sp, space);
+ sp += space; len -= space; space = SHA1_BLOCK_SIZE; pos = 0;
+ bsw_32(ctx->wbuf, SHA1_BLOCK_SIZE >> 2);
+ sha1_compile(ctx);
+ }
+
+ memcpy(((unsigned char*)ctx->wbuf) + pos, sp, len);
+}
+
+/* SHA1 final padding and digest calculation */
+
+void sha1_end(unsigned char hval[], sha1_ctx ctx[1])
+{ sha1_32t i = (sha1_32t)(ctx->count[0] & SHA1_MASK);
+
+ /* put bytes in the buffer in an order in which references to */
+ /* 32-bit words will put bytes with lower addresses into the */
+ /* top of 32 bit words on BOTH big and little endian machines */
+ bsw_32(ctx->wbuf, (i + 3) >> 2);
+
+ /* we now need to mask valid bytes and add the padding which is */
+ /* a single 1 bit and as many zero bits as necessary. Note that */
+ /* we can always add the first padding byte here because the */
+ /* buffer always has at least one empty slot */
+ ctx->wbuf[i >> 2] &= 0xffffff80 << 8 * (~i & 3);
+ ctx->wbuf[i >> 2] |= 0x00000080 << 8 * (~i & 3);
+
+ /* we need 9 or more empty positions, one for the padding byte */
+ /* (above) and eight for the length count. If there is not */
+ /* enough space, pad and empty the buffer */
+ if(i > SHA1_BLOCK_SIZE - 9)
+ {
+ if(i < 60) ctx->wbuf[15] = 0;
+ sha1_compile(ctx);
+ i = 0;
+ }
+ else /* compute a word index for the empty buffer positions */
+ i = (i >> 2) + 1;
+
+ while(i < 14) /* and zero pad all but last two positions */
+ ctx->wbuf[i++] = 0;
+
+ /* the following 32-bit length fields are assembled in the */
+ /* wrong byte order on little endian machines but this is */
+ /* corrected later since they are only ever used as 32-bit */
+ /* word values. */
+ ctx->wbuf[14] = (ctx->count[1] << 3) | (ctx->count[0] >> 29);
+ ctx->wbuf[15] = ctx->count[0] << 3;
+ sha1_compile(ctx);
+
+ /* extract the hash value as bytes in case the hash buffer is */
+ /* misaligned for 32-bit words */
+ for(i = 0; i < SHA1_DIGEST_SIZE; ++i)
+ hval[i] = (unsigned char)(ctx->hash[i >> 2] >> (8 * (~i & 3)));
+}
+
+void sha1(unsigned char hval[], const unsigned char data[], unsigned __int32 len)
+{ sha1_ctx cx[1];
+
+ sha1_begin(cx); sha1_hash(data, len, cx); sha1_end(hval, cx);
+}
+
+#if defined(__cplusplus)
+}
+#endif