SHA1--C语言实现--openssl-1.1.1改写（自动匹配芯片大小端）

改写自 openssl-1.1.1的SHA1的C语言实现，高效，自动匹配处理器大小端

# define SHA_LBLOCK      16
# define SHA_CBLOCK      (SHA_LBLOCK*4)/* SHA treats input data as a
                                        * contiguous array of 32 bit wide
                                        * big-endian values. */

typedef struct SHAstate_st {
    unsigned int h0, h1, h2, h3, h4;
    unsigned int Nl, Nh;
    unsigned int data[SHA_LBLOCK];
    unsigned int num;
} SHA_CTX;

#define INIT_DATA_h0 0x67452301UL
#define INIT_DATA_h1 0xefcdab89UL
#define INIT_DATA_h2 0x98badcfeUL
#define INIT_DATA_h3 0x10325476UL
#define INIT_DATA_h4 0xc3d2e1f0UL

#define K_00_19 0x5a827999UL
#define K_20_39 0x6ed9eba1UL
#define K_40_59 0x8f1bbcdcUL
#define K_60_79 0xca62c1d6UL

#define X(i)   XX[i]
#define ROTATE(v, n) (((v) << (n)) | ((v) >> (32 - (n))))
#define Xupdate(a,ix,ia,ib,ic,id)       ( (a)=(ia^ib^ic^id),    \
                                          ix=(a)=ROTATE((a),1)  \
                                        )

#define F_00_19(b,c,d)  ((((c) ^ (d)) & (b)) ^ (d))
#define F_20_39(b,c,d)  ((b) ^ (c) ^ (d))
#define F_40_59(b,c,d)  (((b) & (c)) | (((b)|(c)) & (d)))
#define F_60_79(b,c,d)  F_20_39(b,c,d)

#define BODY_00_15(i,a,b,c,d,e,f,xi) \
        (f)=xi+(e)+K_00_19+ROTATE((a),5)+F_00_19((b),(c),(d)); \
        (b)=ROTATE((b),30);

#define BODY_16_19(i,a,b,c,d,e,f,xi,xa,xb,xc,xd) \
        Xupdate(f,xi,xa,xb,xc,xd); \
        (f)+=(e)+K_00_19+ROTATE((a),5)+F_00_19((b),(c),(d)); \
        (b)=ROTATE((b),30);

#define BODY_20_31(i,a,b,c,d,e,f,xi,xa,xb,xc,xd) \
        Xupdate(f,xi,xa,xb,xc,xd); \
        (f)+=(e)+K_20_39+ROTATE((a),5)+F_20_39((b),(c),(d)); \
        (b)=ROTATE((b),30);

#define BODY_32_39(i,a,b,c,d,e,f,xa,xb,xc,xd) \
        Xupdate(f,xa,xa,xb,xc,xd); \
        (f)+=(e)+K_20_39+ROTATE((a),5)+F_20_39((b),(c),(d)); \
        (b)=ROTATE((b),30);

#define BODY_40_59(i,a,b,c,d,e,f,xa,xb,xc,xd) \
        Xupdate(f,xa,xa,xb,xc,xd); \
        (f)+=(e)+K_40_59+ROTATE((a),5)+F_40_59((b),(c),(d)); \
        (b)=ROTATE((b),30);

#define BODY_60_79(i,a,b,c,d,e,f,xa,xb,xc,xd) \
        Xupdate(f,xa,xa,xb,xc,xd); \
        (f)=xa+(e)+K_60_79+ROTATE((a),5)+F_60_79((b),(c),(d)); \
        (b)=ROTATE((b),30);

# define HOST_c2l(c,l)  (l =(((unsigned long)(*((c)++)))<<24),          \
                         l|=(((unsigned long)(*((c)++)))<<16),          \
                         l|=(((unsigned long)(*((c)++)))<< 8),          \
                         l|=(((unsigned long)(*((c)++)))    )           )
# define HOST_l2c(l,c)  (*((c)++)=(unsigned char)(((l)>>24)&0xff),      \
                         *((c)++)=(unsigned char)(((l)>>16)&0xff),      \
                         *((c)++)=(unsigned char)(((l)>> 8)&0xff),      \
                         *((c)++)=(unsigned char)(((l)    )&0xff),      \
                         l)

#define HASH_MAKE_STRING(c,s)   do {    \
        unsigned long ll;               \
        ll=(c)->h0; (void)HOST_l2c(ll,(s));     \
        ll=(c)->h1; (void)HOST_l2c(ll,(s));     \
        ll=(c)->h2; (void)HOST_l2c(ll,(s));     \
        ll=(c)->h3; (void)HOST_l2c(ll,(s));     \
        ll=(c)->h4; (void)HOST_l2c(ll,(s));     \
        } while (0)

static void HASH_BLOCK_DATA_ORDER(SHA_CTX *c, const void *p, size_t num)
{
    const unsigned char *data = (unsigned char *)p;
    register unsigned int A, B, C, D, E, T, l;
    unsigned int XX[16];


    A = c->h0;
    B = c->h1;
    C = c->h2;
    D = c->h3;
    E = c->h4;

    for (;;) {
        const union {
            long one;
            char little;
        } is_endian = {
            1
        };

        if (!is_endian.little && ((size_t)p % 4) == 0) {
            const unsigned int *W = (const unsigned int *)data;

            X(0) = W[0];
            X(1) = W[1];
            BODY_00_15(0, A, B, C, D, E, T, X(0));
            X(2) = W[2];
            BODY_00_15(1, T, A, B, C, D, E, X(1));
            X(3) = W[3];
            BODY_00_15(2, E, T, A, B, C, D, X(2));
            X(4) = W[4];
            BODY_00_15(3, D, E, T, A, B, C, X(3));
            X(5) = W[5];
            BODY_00_15(4, C, D, E, T, A, B, X(4));
            X(6) = W[6];
            BODY_00_15(5, B, C, D, E, T, A, X(5));
            X(7) = W[7];
            BODY_00_15(6, A, B, C, D, E, T, X(6));
            X(8) = W[8];
            BODY_00_15(7, T, A, B, C, D, E, X(7));
            X(9) = W[9];
            BODY_00_15(8, E, T, A, B, C, D, X(8));
            X(10) = W[10];
            BODY_00_15(9, D, E, T, A, B, C, X(9));
            X(11) = W[11];
            BODY_00_15(10, C, D, E, T, A, B, X(10));
            X(12) = W[12];
            BODY_00_15(11, B, C, D, E, T, A, X(11));
            X(13) = W[13];
            BODY_00_15(12, A, B, C, D, E, T, X(12));
            X(14) = W[14];
            BODY_00_15(13, T, A, B, C, D, E, X(13));
            X(15) = W[15];
            BODY_00_15(14, E, T, A, B, C, D, X(14));
            BODY_00_15(15, D, E, T, A, B, C, X(15));

            data += SHA_CBLOCK;
        } else {
            (void)HOST_c2l(data, l);
            X(0) = l;
            (void)HOST_c2l(data, l);
            X(1) = l;
            BODY_00_15(0, A, B, C, D, E, T, X(0));
            (void)HOST_c2l(data, l);
            X(2) = l;
            BODY_00_15(1, T, A, B, C, D, E, X(1));
            (void)HOST_c2l(data, l);
            X(3) = l;
            BODY_00_15(2, E, T, A, B, C, D, X(2));
            (void)HOST_c2l(data, l);
            X(4) = l;
            BODY_00_15(3, D, E, T, A, B, C, X(3));
            (void)HOST_c2l(data, l);
            X(5) = l;
            BODY_00_15(4, C, D, E, T, A, B, X(4));
            (void)HOST_c2l(data, l);
            X(6) = l;
            BODY_00_15(5, B, C, D, E, T, A, X(5));
            (void)HOST_c2l(data, l);
            X(7) = l;
            BODY_00_15(6, A, B, C, D, E, T, X(6));
            (void)HOST_c2l(data, l);
            X(8) = l;
            BODY_00_15(7, T, A, B, C, D, E, X(7));
            (void)HOST_c2l(data, l);
            X(9) = l;
            BODY_00_15(8, E, T, A, B, C, D, X(8));
            (void)HOST_c2l(data, l);
            X(10) = l;
            BODY_00_15(9, D, E, T, A, B, C, X(9));
            (void)HOST_c2l(data, l);
            X(11) = l;
            BODY_00_15(10, C, D, E, T, A, B, X(10));
            (void)HOST_c2l(data, l);
            X(12) = l;
            BODY_00_15(11, B, C, D, E, T, A, X(11));
            (void)HOST_c2l(data, l);
            X(13) = l;
            BODY_00_15(12, A, B, C, D, E, T, X(12));
            (void)HOST_c2l(data, l);
            X(14) = l;
            BODY_00_15(13, T, A, B, C, D, E, X(13));
            (void)HOST_c2l(data, l);
            X(15) = l;
            BODY_00_15(14, E, T, A, B, C, D, X(14));
            BODY_00_15(15, D, E, T, A, B, C, X(15));
        }

        BODY_16_19(16, C, D, E, T, A, B, X(0), X(0), X(2), X(8), X(13));
        BODY_16_19(17, B, C, D, E, T, A, X(1), X(1), X(3), X(9), X(14));
        BODY_16_19(18, A, B, C, D, E, T, X(2), X(2), X(4), X(10), X(15));
        BODY_16_19(19, T, A, B, C, D, E, X(3), X(3), X(5), X(11), X(0));

        BODY_20_31(20, E, T, A, B, C, D, X(4), X(4), X(6), X(12), X(1));
        BODY_20_31(21, D, E, T, A, B, C, X(5), X(5), X(7), X(13), X(2));
        BODY_20_31(22, C, D, E, T, A, B, X(6), X(6), X(8), X(14), X(3));
        BODY_20_31(23, B, C, D, E, T, A, X(7), X(7), X(9), X(15), X(4));
        BODY_20_31(24, A, B, C, D, E, T, X(8), X(8), X(10), X(0), X(5));
        BODY_20_31(25, T, A, B, C, D, E, X(9), X(9), X(11), X(1), X(6));
        BODY_20_31(26, E, T, A, B, C, D, X(10), X(10), X(12), X(2), X(7));
        BODY_20_31(27, D, E, T, A, B, C, X(11), X(11), X(13), X(3), X(8));
        BODY_20_31(28, C, D, E, T, A, B, X(12), X(12), X(14), X(4), X(9));
        BODY_20_31(29, B, C, D, E, T, A, X(13), X(13), X(15), X(5), X(10));
        BODY_20_31(30, A, B, C, D, E, T, X(14), X(14), X(0), X(6), X(11));
        BODY_20_31(31, T, A, B, C, D, E, X(15), X(15), X(1), X(7), X(12));

        BODY_32_39(32, E, T, A, B, C, D, X(0), X(2), X(8), X(13));
        BODY_32_39(33, D, E, T, A, B, C, X(1), X(3), X(9), X(14));
        BODY_32_39(34, C, D, E, T, A, B, X(2), X(4), X(10), X(15));
        BODY_32_39(35, B, C, D, E, T, A, X(3), X(5), X(11), X(0));
        BODY_32_39(36, A, B, C, D, E, T, X(4), X(6), X(12), X(1));
        BODY_32_39(37, T, A, B, C, D, E, X(5), X(7), X(13), X(2));
        BODY_32_39(38, E, T, A, B, C, D, X(6), X(8), X(14), X(3));
        BODY_32_39(39, D, E, T, A, B, C, X(7), X(9), X(15), X(4));

        BODY_40_59(40, C, D, E, T, A, B, X(8), X(10), X(0), X(5));
        BODY_40_59(41, B, C, D, E, T, A, X(9), X(11), X(1), X(6));
        BODY_40_59(42, A, B, C, D, E, T, X(10), X(12), X(2), X(7));
        BODY_40_59(43, T, A, B, C, D, E, X(11), X(13), X(3), X(8));
        BODY_40_59(44, E, T, A, B, C, D, X(12), X(14), X(4), X(9));
        BODY_40_59(45, D, E, T, A, B, C, X(13), X(15), X(5), X(10));
        BODY_40_59(46, C, D, E, T, A, B, X(14), X(0), X(6), X(11));
        BODY_40_59(47, B, C, D, E, T, A, X(15), X(1), X(7), X(12));
        BODY_40_59(48, A, B, C, D, E, T, X(0), X(2), X(8), X(13));
        BODY_40_59(49, T, A, B, C, D, E, X(1), X(3), X(9), X(14));
        BODY_40_59(50, E, T, A, B, C, D, X(2), X(4), X(10), X(15));
        BODY_40_59(51, D, E, T, A, B, C, X(3), X(5), X(11), X(0));
        BODY_40_59(52, C, D, E, T, A, B, X(4), X(6), X(12), X(1));
        BODY_40_59(53, B, C, D, E, T, A, X(5), X(7), X(13), X(2));
        BODY_40_59(54, A, B, C, D, E, T, X(6), X(8), X(14), X(3));
        BODY_40_59(55, T, A, B, C, D, E, X(7), X(9), X(15), X(4));
        BODY_40_59(56, E, T, A, B, C, D, X(8), X(10), X(0), X(5));
        BODY_40_59(57, D, E, T, A, B, C, X(9), X(11), X(1), X(6));
        BODY_40_59(58, C, D, E, T, A, B, X(10), X(12), X(2), X(7));
        BODY_40_59(59, B, C, D, E, T, A, X(11), X(13), X(3), X(8));

        BODY_60_79(60, A, B, C, D, E, T, X(12), X(14), X(4), X(9));
        BODY_60_79(61, T, A, B, C, D, E, X(13), X(15), X(5), X(10));
        BODY_60_79(62, E, T, A, B, C, D, X(14), X(0), X(6), X(11));
        BODY_60_79(63, D, E, T, A, B, C, X(15), X(1), X(7), X(12));
        BODY_60_79(64, C, D, E, T, A, B, X(0), X(2), X(8), X(13));
        BODY_60_79(65, B, C, D, E, T, A, X(1), X(3), X(9), X(14));
        BODY_60_79(66, A, B, C, D, E, T, X(2), X(4), X(10), X(15));
        BODY_60_79(67, T, A, B, C, D, E, X(3), X(5), X(11), X(0));
        BODY_60_79(68, E, T, A, B, C, D, X(4), X(6), X(12), X(1));
        BODY_60_79(69, D, E, T, A, B, C, X(5), X(7), X(13), X(2));
        BODY_60_79(70, C, D, E, T, A, B, X(6), X(8), X(14), X(3));
        BODY_60_79(71, B, C, D, E, T, A, X(7), X(9), X(15), X(4));
        BODY_60_79(72, A, B, C, D, E, T, X(8), X(10), X(0), X(5));
        BODY_60_79(73, T, A, B, C, D, E, X(9), X(11), X(1), X(6));
        BODY_60_79(74, E, T, A, B, C, D, X(10), X(12), X(2), X(7));
        BODY_60_79(75, D, E, T, A, B, C, X(11), X(13), X(3), X(8));
        BODY_60_79(76, C, D, E, T, A, B, X(12), X(14), X(4), X(9));
        BODY_60_79(77, B, C, D, E, T, A, X(13), X(15), X(5), X(10));
        BODY_60_79(78, A, B, C, D, E, T, X(14), X(0), X(6), X(11));
        BODY_60_79(79, T, A, B, C, D, E, X(15), X(1), X(7), X(12));

        c->h0 = (c->h0 + E) & 0xffffffffL;
        c->h1 = (c->h1 + T) & 0xffffffffL;
        c->h2 = (c->h2 + A) & 0xffffffffL;
        c->h3 = (c->h3 + B) & 0xffffffffL;
        c->h4 = (c->h4 + C) & 0xffffffffL;

        if (--num == 0)
            break;

        A = c->h0;
        B = c->h1;
        C = c->h2;
        D = c->h3;
        E = c->h4;

    }
}

static int SHA1_Init(SHA_CTX *c)
{
    memset(c, 0, sizeof(*c));
    c->h0 = INIT_DATA_h0;
    c->h1 = INIT_DATA_h1;
    c->h2 = INIT_DATA_h2;
    c->h3 = INIT_DATA_h3;
    c->h4 = INIT_DATA_h4;
    return 1;
}

static int SHA1_Update(SHA_CTX *c, const void *data_, size_t len)
{
    const unsigned char *data = (unsigned char *)data_;
    unsigned char *p;
    unsigned int l;
    size_t n;

    if (len == 0)
        return 1;

    l = (c->Nl + (((unsigned int) len) << 3)) & 0xffffffffUL;
    if (l < c->Nl)              /* overflow */
        c->Nh++;
    c->Nh += (unsigned int) (len >> 29); /* might cause compiler warning on
                                       * 16-bit */
    c->Nl = l;

    n = c->num;
    if (n != 0) {
        p = (unsigned char *)c->data;

        if (len >= SHA_CBLOCK || len + n >= SHA_CBLOCK) {
            memcpy(p + n, data, SHA_CBLOCK - n);
            HASH_BLOCK_DATA_ORDER(c, p, 1);
            n = SHA_CBLOCK - n;
            data += n;
            len -= n;
            c->num = 0;
            /*
             * We use memset rather than OPENSSL_cleanse() here deliberately.
             * Using OPENSSL_cleanse() here could be a performance issue. It
             * will get properly cleansed on finalisation so this isn't a
             * security problem.
             */
            memset(p, 0, SHA_CBLOCK); /* keep it zeroed */
        } else {
            memcpy(p + n, data, len);
            c->num += (unsigned int)len;
            return 1;
        }
    }

    n = len / SHA_CBLOCK;
    if (n > 0) {
        HASH_BLOCK_DATA_ORDER(c, data, n);
        n *= SHA_CBLOCK;
        data += n;
        len -= n;
    }

    if (len != 0) {
        p = (unsigned char *)c->data;
        c->num = (unsigned int)len;
        memcpy(p, data, len);
    }
    return 1;
}

static int SHA1_Final(unsigned char *md, SHA_CTX *c)
{
    unsigned char *p = (unsigned char *)c->data;
    size_t n = c->num;

    p[n] = 0x80;                /* there is always room for one */
    n++;

    if (n > (SHA_CBLOCK - 8)) {
        memset(p + n, 0, SHA_CBLOCK - n);
        n = 0;
        HASH_BLOCK_DATA_ORDER(c, p, 1);
    }
    memset(p + n, 0, SHA_CBLOCK - 8 - n);

    p += SHA_CBLOCK - 8;

    (void)HOST_l2c(c->Nh, p);
    (void)HOST_l2c(c->Nl, p);

    p -= SHA_CBLOCK;
    HASH_BLOCK_DATA_ORDER(c, p, 1);
    c->num = 0;
    memset(p, 0, SHA_CBLOCK);

    HASH_MAKE_STRING(c, md);

    return 1;
}

/*!
@brief      求内存块BUFFER的SHA1值
@return     unsigned char* 返回的的结果
@param[in]  buf    求SHA1的内存BUFFER指针
@param[in]  size   BUFFER长度
@param[out] result 结果
*/
void SHA1(const unsigned char *msg, size_t size, unsigned char result[20])
{
    SHA_CTX c;

    SHA1_Init(&c);
    SHA1_Update(&c, msg, size);
    SHA1_Final(result, &c);
    memset(&c, 0, sizeof(c));
}