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Create sm3_standard.c
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laiwei360735
368
crypto/sm3/sm3_standard.c
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368
crypto/sm3/sm3_standard.c
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@@ -0,0 +1,368 @@
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#include "openssl/sm3_standard.h"
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/****************************************************************
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Function: BiToW
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Description: calculate W from Bi
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Calls:
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Called By: SM3_compress
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Input: Bi[16] //a block of a message
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Output: W[64]
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Return: null
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Others:
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****************************************************************/
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void BiToW(unsigned int Bi[], unsigned int W[])
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{
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int i;
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unsigned int tmp;
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for (i = 0; i <= 15; i++)
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{
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W[i] = Bi[i];
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}
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for (i = 16; i <= 67; i++)
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{
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tmp = W[i - 16]
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^ W[i - 9]
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^ SM3_rotl32(W[i - 3], 15);
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W[i] = SM3_p1(tmp)
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^ (SM3_rotl32(W[i - 13], 7))
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^ W[i - 6];
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}
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}
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/*****************************************************************
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Function: WToW1
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Description: calculate W1 from W
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Calls:
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Called By: SM3_compress
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Input: W[64]
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Output: W1[64]
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Return: null
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Others:
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*****************************************************************/
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void WToW1(unsigned int W[], unsigned int W1[])
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{
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int i;
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for (i = 0; i <= 63; i++)
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{
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W1[i] = W[i] ^ W[i + 4];
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}
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}
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/******************************************************************
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Function: CF
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Description: calculate the CF compress function and update V
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Calls:
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Called By: SM3_compress
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Input: W[64]
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W1[64]
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V[8]
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Output: V[8]
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Return: null
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Others:
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********************************************************************/
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void CF(unsigned int W[], unsigned int W1[], unsigned int V[])
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{
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unsigned int SS1;
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unsigned int SS2;
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unsigned int TT1;
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unsigned int TT2;
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unsigned int A, B, C, D, E, F, G, H;
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unsigned int T = SM3_T1;
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unsigned int FF;
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unsigned int GG;
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int j;
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//reg init,set ABCDEFGH=V0
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A = V[0];
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B = V[1];
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C = V[2];
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D = V[3];
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E = V[4];
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F = V[5];
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G = V[6];
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H = V[7];
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for (j = 0; j <= 63; j++)
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{
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//SS1
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if (j == 0)
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{
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T = SM3_T1;
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}
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else if (j == 16)
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{
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T = SM3_rotl32(SM3_T2, 16);
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}
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else
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{
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T = SM3_rotl32(T, 1);
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}
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SS1 = SM3_rotl32((SM3_rotl32(A, 12) + E + T), 7);
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//SS2
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SS2 = SS1^SM3_rotl32(A, 12);
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//TT1
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if (j <= 15)
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{
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FF = SM3_ff0(A, B, C);
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}
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else
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{
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FF = SM3_ff1(A, B, C);
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}
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TT1 = FF + D + SS2 + *W1;
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W1++;
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//TT2
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if (j <= 15)
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{
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GG = SM3_gg0(E, F, G);
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}
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else
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{
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GG = SM3_gg1(E, F, G);
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}
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TT2 = GG + H + SS1 + *W;
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W++;
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//D
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D = C;
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//C
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C = SM3_rotl32(B, 9);
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//B
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B = A;
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//A
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A = TT1;
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//H
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H = G;
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//G
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G = SM3_rotl32(F, 19);
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//F
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F = E;
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//E
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E = SM3_p0(TT2);
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}
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//update V
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V[0] = A^V[0];
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V[1] = B^V[1];
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V[2] = C^V[2];
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V[3] = D^V[3];
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V[4] = E^V[4];
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V[5] = F^V[5];
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V[6] = G^V[6];
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V[7] = H^V[7];
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}
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/******************************************************************************
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Function: BigEndian
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Description: U32 endian converse.GM/T 0004-2012 requires to use big-endian.
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if CPU uses little-endian, BigEndian function is a necessary
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call to change the little-endian format into big-endian format.
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Calls:
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Called By: SM3_compress, SM3_done
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Input: src[bytelen]
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bytelen
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Output: des[bytelen]
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Return: null
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Others: src and des could implies the same address
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*******************************************************************************/
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void BigEndian(unsigned char src[], unsigned int bytelen, unsigned char des[])
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{
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unsigned char tmp = 0;
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unsigned int i = 0;
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for (i = 0; i<bytelen / 4; i++)
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{
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tmp = des[4 * i];
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des[4 * i] = src[4 * i + 3];
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src[4 * i + 3] = tmp;
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tmp = des[4 * i + 1];
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des[4 * i + 1] = src[4 * i + 2];
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des[4 * i + 2] = tmp;
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}
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}
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/******************************************************************************
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Function: SM3_init
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Description: initiate SM3 state
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Calls:
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Called By: SM3_256
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Input: SM3_STATE *md
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Output: SM3_STATE *md
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Return: null
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Others:
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*******************************************************************************/
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void SM3_init(SM3_STATE *md)
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{
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md->curlen = md->length = 0;
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md->state[0] = SM3_IVA;
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md->state[1] = SM3_IVB;
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md->state[2] = SM3_IVC;
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md->state[3] = SM3_IVD;
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md->state[4] = SM3_IVE;
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md->state[5] = SM3_IVF;
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md->state[6] = SM3_IVG;
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md->state[7] = SM3_IVH;
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}
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/******************************************************************************
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Function: SM3_compress
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Description: compress a single block of message
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Calls: BigEndian
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BiToW
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WToW1
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CF
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Called By: SM3_256
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Input: SM3_STATE *md
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Output: SM3_STATE *md
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Return: null
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Others:
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*******************************************************************************/
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void SM3_compress(SM3_STATE * md)
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{
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unsigned int W[68];
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unsigned int W1[64];
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//if CPU uses little-endian, BigEndian function is a necessary call
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BigEndian(md->buf, 64, md->buf);
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BiToW((unsigned int *)md->buf, W);
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WToW1(W, W1);
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CF(W, W1, md->state);
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}
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/******************************************************************************
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Function: SM3_process
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Description: compress the first (len/64) blocks of message
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Calls: SM3_compress
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Called By: SM3_256
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Input: SM3_STATE *md
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unsigned char buf[len] //the input message
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int len //bytelen of message
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Output: SM3_STATE *md
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Return: null
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Others:
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*******************************************************************************/
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void SM3_process(SM3_STATE * md, unsigned char *buf, int len)
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{
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while (len--)
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{
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/* copy byte */
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md->buf[md->curlen] = *buf++;
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md->curlen++;
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/* is 64 bytes full? */
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if (md->curlen == 64)
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{
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SM3_compress(md);
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md->length += 512;
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md->curlen = 0;
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}
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}
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}
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/******************************************************************************
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Function: SM3_done
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Description: compress the rest message that the SM3_process has left behind
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Calls: SM3_compress
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Called By: SM3_256
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Input: SM3_STATE *md
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Output: unsigned char *hash
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Return: null
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Others:
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*******************************************************************************/
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void SM3_done(SM3_STATE *md, unsigned char hash[])
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{
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int i;
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unsigned char tmp = 0;
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/* increase the bit length of the message */
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md->length += md->curlen << 3;
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/* append the '1' bit */
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md->buf[md->curlen] = 0x80;
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md->curlen++;
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/* if the length is currently above 56 bytes, appends zeros till
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it reaches 64 bytes, compress the current block, creat a new
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block by appending zeros and length,and then compress it
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*/
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if (md->curlen >56)
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{
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for (; md->curlen < 64;)
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{
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md->buf[md->curlen] = 0;
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md->curlen++;
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}
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SM3_compress(md);
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md->curlen = 0;
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}
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/* if the length is less than 56 bytes, pad upto 56 bytes of zeroes */
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for (; md->curlen < 56;)
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{
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md->buf[md->curlen] = 0;
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md->curlen++;
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}
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/* since all messages are under 2^32 bits we mark the top bits zero */
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for (i = 56; i < 60; i++)
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{
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md->buf[i] = 0;
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}
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/* append length */
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md->buf[63] = md->length & 0xff;
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md->buf[62] = (md->length >> 8) & 0xff;
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md->buf[61] = (md->length >> 16) & 0xff;
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md->buf[60] = (md->length >> 24) & 0xff;
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SM3_compress(md);
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/* copy output */
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memcpy(hash, md->state, SM3_len / 8);
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BigEndian(hash, SM3_len / 8, hash);//if CPU uses little-endian, BigEndian function is a necessary call
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}
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/******************************************************************************
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Function: SM3_256
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Description: calculate a hash value from a given message
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Calls: SM3_init
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SM3_process
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SM3_done
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Called By:
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Input: unsigned char buf[len] //the input message
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int len //bytelen of the message
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Output: unsigned char hash[32]
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Return: null
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Others:
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*******************************************************************************/
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void SM3_256(unsigned char buf[], int len, unsigned char hash[])
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{
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SM3_STATE md;
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SM3_init(&md);
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SM3_process(&md, buf, len);
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SM3_done(&md, hash);
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}
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