GD32F450_BMC_BaseCode/app/bmc/encryption/sha1.c

// /*
//  ---------------------------------------------------------------------------
//  Copyright (c) 2002, Dr Brian Gladman <brg@gladman.me.uk>, Worcester, UK.
//  All rights reserved.

//  LICENSE TERMS

//  The free distribution and use of this software in both source and binary
//  form is allowed (with or without changes) provided that:

//    1. distributions of this source code include the above copyright
//       notice, this list of conditions and the following disclaimer;

//    2. distributions in binary form include the above copyright
//       notice, this list of conditions and the following disclaimer
//       in the documentation and/or other associated materials;

//    3. the copyright holder's name is not used to endorse products
//       built using this software without specific written permission.

//  ALTERNATIVELY, provided that this notice is retained in full, this product
//  may be distributed under the terms of the GNU General Public License (GPL),
//  in which case the provisions of the GPL apply INSTEAD OF those given above.

//  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: 24/01/2003

//  This is a byte oriented version of SHA1 that operates on arrays of bytes
//  stored in memory.
// */
// #include "com_BmcType.h"
// #include "sha1.h"
// #include "memory.h"
// #include "Platform.h"
// #include "coreTypes.h"
// /*
//     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.
// */

// #define SHA_LITTLE_ENDIAN	1
// #define SHA_BIG_ENDIAN		2

// #if IS_PLATFORM_X86() || IS_PLATFORM_ARM() || IS_PLATFORM_SH()
// #define PLATFORM_BYTE_ORDER		SHA_LITTLE_ENDIAN	
// #else
// #define PLATFORM_BYTE_ORDER		SHA_BIG_ENDIAN	
// #endif

// #define rotl32(x,n) (((x) << n) | ((x) >> (32 - n)))

// #if (PLATFORM_BYTE_ORDER == SHA_BIG_ENDIAN)
// #define swap_b32(x) (x)
// #elif defined(bswap_32)
// #define swap_b32(x) bswap_32(x)
// #else
// #define swap_b32(x) ((rotl32((x), 8) & 0x00ff00ff) | (rotl32((x), 24) & 0xff00ff00))
// #endif

// #define SHA1_MASK   (SHA1_BLOCK_SIZE - 1)

// /* reverse byte order in 32-bit words       */

// #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)))

// /* A normal version as set out in the FIPS  */

// #define rnd(f,k)    \
//     t = a; a = rotl32(a,5) + f(b,c,d) + e + k + w[i]; \
//     e = d; d = c; c = rotl32(b, 30); b = t

// #if (PLATFORM_BYTE_ORDER == SHA_LITTLE_ENDIAN)
// static  uint32  mask[4] =
//     {   0x00000000, 0x000000ff, 0x0000ffff, 0x00ffffff };
// static  uint32  bits[4] =
//     {   0x00000080, 0x00008000, 0x00800000, 0x80000000 };
// #else
// static  uint32  mask[4] =
//     {   0x00000000, 0xff000000, 0xffff0000, 0xffffff00 };
// static  uint32  bits[4] =
//     {   0x80000000, 0x00800000, 0x00008000, 0x00000080 };
// #endif


// /*----------------------------------------
//  * sha1_compile
//  *----------------------------------------*/
// void 
// sha1_compile ( Sha1_Ctx_T* pctx)
// {   
// 	int i;
// 	uint32    w [80], a, b, c, d, e, t;

//     /* note that words are compiled from the buffer into 32-bit */
//     /* words in big-endian order so an order reversal is needed */
//     /* here on little endian machines                           */
//     for (i = 0; i < SHA1_BLOCK_SIZE / 4; ++i)
// 	{
//         w [i] = swap_b32 (pctx->wbuf [i]);
// 	}

//     for (i = SHA1_BLOCK_SIZE / 4; i < 80; ++i)
// 	{
//         w[i] = rotl32(w[i - 3] ^ w[i - 8] ^ w[i - 14] ^ w[i - 16], 1);
// 	}

//     a = pctx->hash [0];
//     b = pctx->hash [1];
//     c = pctx->hash [2];
//     d = pctx->hash [3];
//     e = pctx->hash [4];

//     for (i = 0; i < 20; ++i)
//     {
//         rnd (ch, 0x5a827999);
//     }

//     for (i = 20; i < 40; ++i)
//     {
//         rnd (parity, 0x6ed9eba1);
//     }

//     for (i = 40; i < 60; ++i)
//     {
//         rnd (maj, 0x8f1bbcdc);
//     }

//     for (i = 60; i < 80; ++i)
//     {
//         rnd (parity, 0xca62c1d6);
//     }

//     pctx->hash [0] += a;
//     pctx->hash [1] += b;
//     pctx->hash [2] += c;
//     pctx->hash [3] += d;
//     pctx->hash [4] += e;
// }

// /*----------------------------------------
//  * sha1_begin
//  *----------------------------------------*/
// void 
// sha1_begin ( Sha1_Ctx_T* pctx)
// {
//     pctx->count [0] = pctx->count [1] = 0;
//     pctx->hash [0]  = 0x67452301;
//     pctx->hash [1]  = 0xefcdab89;
//     pctx->hash [2]  = 0x98badcfe;
//     pctx->hash [3]  = 0x10325476;
//     pctx->hash [4]  = 0xc3d2e1f0;
// }

// /*----------------------------------------
//  * sha1_hash
//  *----------------------------------------*/
// void 
// sha1_hash ( INT8U* pdata, INT16U len,  Sha1_Ctx_T* pctx)
// {
// 	/* SHA1 hash data in an array of bytes into hash buffer and */
// 	/* call the hash_compile function as required.              */
// 	uint32 pos = (uint32)(pctx->count[0] & SHA1_MASK),
//              space = SHA1_BLOCK_SIZE - pos;
//      INT8U *sp = pdata;
 
//     if ((pctx->count[0] += len) < len)  { ++(pctx->count[1]); }

//     while (len >= space)     /* tranfer whole blocks if possible  */
//     {
//         memcpy ((( INT8U*)pctx->wbuf) + pos, sp, space);
//         sp += space; len -= (INT16U)space; space = SHA1_BLOCK_SIZE; pos = 0;
//         sha1_compile (pctx);

//     }

// 	//dispscont (pctx);

//     /*lint -e{803} conceivable data overrun */
//     /* there are two cases: the above while loop entered or not */
//     /* entered. If not entered, 'space = SHA1_BLOCK_SIZE - pos' */
//     /* and 'len < space' so that 'len + pos < SHA1_BLOCK_SIZE'. */
//     /* If entered, 'pos = 0', 'space = SHA1_BLOCK_SIZE' and     */
//     /* 'len < space' so that 'pos + len < SHA1_BLOCK_SIZE'. In  */
//     /* both cases, therefore, the memory copy is in the buffer  */

//     memcpy ((( INT8U*)pctx->wbuf) + pos, sp, len);

// }


// /*----------------------------------------
//  * sha1_end
//  *----------------------------------------*/
// void 
// sha1_end ( INT8U* phval,  Sha1_Ctx_T* pctx)
// {
// 	uint32    i = (uint32)(pctx->count [0] & SHA1_MASK);

// 	/* SHA1 final padding and digest calculation  */

//     /* mask out the rest of any partial 32-bit word and then set    */
//     /* the next byte to 0x80. On big-endian machines any bytes in   */
//     /* the buffer will be at the top end of 32 bit words, on little */
//     /* endian machines they will be at the bottom. Hence the AND    */
//     /* and OR masks above are reversed for little endian systems    */
//     /* Note that we can always add the first padding byte at this   */
//     /* point because the buffer always has at least one empty slot  */
//     pctx->wbuf [(INT16U)(i >> 2)] = (pctx->wbuf [(INT16U)(i >> 2)] & mask [(INT16U)(i & 3)]) | bits [(INT16U)(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) { pctx->wbuf [15] = 0; }
//         sha1_compile (pctx);
//         i = 0;
//     }
//     else    /* compute a word index for the empty buffer positions  */
// 	{
//         i = (i >> 2) + 1;
// 	}

// 	/* and zero pad all but last two positions        */
//     while (i < 14)  {  pctx->wbuf[(INT16U)(i++)] = 0; }


//     /* assemble the eight byte counter in in big-endian format      */
//     pctx->wbuf [14] = swap_b32 ((pctx->count[1] << 3) | (pctx->count[0] >> 29));
//     pctx->wbuf [15] = swap_b32 (pctx->count[0] << 3);

//     sha1_compile (pctx);


//     /* extract the hash value as bytes in case the hash buffer is   */
//     /* misaligned for 32-bit words                                  */
//     /*lint -e{504} unusual shift operation (unusually formed right argument) */
//     for (i = 0; i < SHA1_DIGEST_SIZE; ++i)
// 	{
//         phval [(INT16U)(i)] = (INT8U)(pctx->hash [(INT16U)(i >> 2)] >> (8 * (~i & 3)));
// 	}

// }

// /*----------------------------------------
//  * sha1
//  *----------------------------------------*/
// void 
// sha1 ( INT8U* phval,  INT8U* pdata, INT16U len)
// {
// 	Sha1_Ctx_T    cx;

//     sha1_begin (&cx); 
// 	sha1_hash (pdata, len, &cx); 
// 	sha1_end (phval, &cx);
// }