文章标题

1.SHA512算法简介
算法的输入时最大长度小于2^128bits的消息，输出是512bits的消息摘要。算法主要分为5个步骤：
（1）附加填充位。填充消息使其长度模1024与896同余，即使消息已经满足上述长度要求，仍然要进行填充，因此填充比特在1~1024之间。填充的内容是一个1和后续的0组成。
（2）附加长度。在消息后附加一份128bits的块，将其视为128bits的无符号整数，它包含填充前消息的长度。
（3）初始化Hash缓冲区
（4）以1024bits的分组为单位处理消息。
（5）输出消息摘要

2.SHA512算法c语言实现
本代码来自于SHA算法规范RFC4634
规范链接：http://www.faqs.org/rfcs/rfc4634.html

c实现包含两个部分SHA512.h和SHA512.c

———————SHA512.h—————————-

#ifndef _SHA512_H_
#define _SHA512_H_

#define  uint64_t unsigned long long
#define  uint32_t unsigned int 
#define  uint8_t  unsigned char
#define  int_least16_t unsigned short

enum SHA_enum{
    shaSuccess = 0,
    shaNull,            /* Null pointer parameter */
    shaInputTooLong,    /* input data too long */
    shaStateError,      /* called Input after FinalBits or Result */
    shaBadParam         /* passed a bad parameter */
};

#define SHA512_Message_Block_Size  128
#define SHA512HashSize  64
#define SHA512HashSizeBits  512

#define SHA_Ch(x,y,z)        (((x) & (y)) ^ ((~(x)) & (z)))//~按位取反
#define SHA_Maj(x,y,z)       (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
#define SHA_Parity(x, y, z)  ((x) ^ (y) ^ (z))

/* Define the SHA shift, rotate left and rotate right macro */
#define SHA512_SHR(bits,word)  (((uint64_t)(word)) >> (bits))
#define SHA512_ROTR(bits,word) ((((uint64_t)(word)) >> (bits)) | (((uint64_t)(word)) << (64 - (bits))))

/* Define the SHA SIGMA and sigma macros */
#define SHA512_SIGMA0(word)   \
    (SHA512_ROTR(28, word) ^ SHA512_ROTR(34, word) ^ SHA512_ROTR(39, word))
#define SHA512_SIGMA1(word)   \
    (SHA512_ROTR(14, word) ^ SHA512_ROTR(18, word) ^ SHA512_ROTR(41, word))
#define SHA512_sigma0(word)   \
    (SHA512_ROTR(1, word) ^ SHA512_ROTR(8, word) ^ SHA512_SHR(7, word))
#define SHA512_sigma1(word)   \
    (SHA512_ROTR(19, word) ^ SHA512_ROTR(61, word) ^ SHA512_SHR(6, word))

typedef struct SHA512Context {

uint64_t Intermediate_Hash[SHA512HashSize / 8]; /* Message Digest */
uint64_t Length_Low, Length_High;   /* Message length in bits */
int_least16_t Message_Block_Index;  /* Message_Block array index */
    /* 1024-bit message blocks */
uint8_t Message_Block[SHA512_Message_Block_Size];

int Computed;                       /* Is the digest computed?*/
int Corrupted;                      /* Is the digest corrupted? */
} SHA512Context;

extern int SHA512Reset(SHA512Context *);//Reset the hash context state
extern int SHA512Input(SHA512Context *, const uint8_t *bytes, unsigned int bytecount);//Incorporate bytecount octets into the hash.
extern int SHA512FinalBits(SHA512Context *, const uint8_t bits, unsigned int bitcount);//Incorporate bitcount bits into the hash.  The bits are in the upper portion of the octet.SHA$$$Input() cannot be called after this.
extern int SHA512Result(SHA512Context *, uint8_t Message_Digest[SHA512HashSize]);//Do the final calculations on the hash and copy the value into Message_Digest.
#endif

———————SHA512.c————-

#include "stdafx.h"
#include "SHA512.h"
#include "string.h"
#define test1 "abc"
static uint64_t SHA512_H0[] = {
    0x6A09E667F3BCC908ll, 0xBB67AE8584CAA73Bll, 0x3C6EF372FE94F82Bll,
    0xA54FF53A5F1D36F1ll, 0x510E527FADE682D1ll, 0x9B05688C2B3E6C1Fll,
    0x1F83D9ABFB41BD6Bll, 0x5BE0CD19137E2179ll
};
/*
* add "length" to the length
*/
static uint64_t addTemp;
#define SHA384_512AddLength(context, length)   (addTemp = context->Length_Low, context->Corrupted = ((context->Length_Low += length) < addTemp) && (++context->Length_High == 0) ? 1 : 0)

#define zfy(a,b) (a=1,b=100)
/*
* SHA384_512ProcessMessageBlock
*
* Description:
*   This helper function will process the next 1024 bits of the
*   message stored in the Message_Block array.
*
* Parameters:
*   context: [in/out]
*     The SHA context to update
*
* Returns:
*   Nothing.
*
* Comments:
*   Many of the variable names in this code, especially the
*   single character names, were used because those were the
*   names used in the publication.
*
*
*/
static void SHA384_512ProcessMessageBlock(SHA512Context *context)
{
    /* Constants defined in FIPS-180-2, section 4.2.3 */
#ifdef USE_32BIT_ONLY
    static const uint32_t K[80 * 2] = {
        0x428A2F98, 0xD728AE22, 0x71374491, 0x23EF65CD, 0xB5C0FBCF,
        0xEC4D3B2F, 0xE9B5DBA5, 0x8189DBBC, 0x3956C25B, 0xF348B538,
        0x59F111F1, 0xB605D019, 0x923F82A4, 0xAF194F9B, 0xAB1C5ED5,
        0xDA6D8118, 0xD807AA98, 0xA3030242, 0x12835B01, 0x45706FBE,
        0x243185BE, 0x4EE4B28C, 0x550C7DC3, 0xD5FFB4E2, 0x72BE5D74,
        0xF27B896F, 0x80DEB1FE, 0x3B1696B1, 0x9BDC06A7, 0x25C71235,
        0xC19BF174, 0xCF692694, 0xE49B69C1, 0x9EF14AD2, 0xEFBE4786,
        0x384F25E3, 0x0FC19DC6, 0x8B8CD5B5, 0x240CA1CC, 0x77AC9C65,
        0x2DE92C6F, 0x592B0275, 0x4A7484AA, 0x6EA6E483, 0x5CB0A9DC,
        0xBD41FBD4, 0x76F988DA, 0x831153B5, 0x983E5152, 0xEE66DFAB,
        0xA831C66D, 0x2DB43210, 0xB00327C8, 0x98FB213F, 0xBF597FC7,
        0xBEEF0EE4, 0xC6E00BF3, 0x3DA88FC2, 0xD5A79147, 0x930AA725,
        0x06CA6351, 0xE003826F, 0x14292967, 0x0A0E6E70, 0x27B70A85,
        0x46D22FFC, 0x2E1B2138, 0x5C26C926, 0x4D2C6DFC, 0x5AC42AED,
        0x53380D13, 0x9D95B3DF, 0x650A7354, 0x8BAF63DE, 0x766A0ABB,
        0x3C77B2A8, 0x81C2C92E, 0x47EDAEE6, 0x92722C85, 0x1482353B,
        0xA2BFE8A1, 0x4CF10364, 0xA81A664B, 0xBC423001, 0xC24B8B70,
        0xD0F89791, 0xC76C51A3, 0x0654BE30, 0xD192E819, 0xD6EF5218,
        0xD6990624, 0x5565A910, 0xF40E3585, 0x5771202A, 0x106AA070,
        0x32BBD1B8, 0x19A4C116, 0xB8D2D0C8, 0x1E376C08, 0x5141AB53,
        0x2748774C, 0xDF8EEB99, 0x34B0BCB5, 0xE19B48A8, 0x391C0CB3,
        0xC5C95A63, 0x4ED8AA4A, 0xE3418ACB, 0x5B9CCA4F, 0x7763E373,
        0x682E6FF3, 0xD6B2B8A3, 0x748F82EE, 0x5DEFB2FC, 0x78A5636F,
        0x43172F60, 0x84C87814, 0xA1F0AB72, 0x8CC70208, 0x1A6439EC,
        0x90BEFFFA, 0x23631E28, 0xA4506CEB, 0xDE82BDE9, 0xBEF9A3F7,
        0xB2C67915, 0xC67178F2, 0xE372532B, 0xCA273ECE, 0xEA26619C,
        0xD186B8C7, 0x21C0C207, 0xEADA7DD6, 0xCDE0EB1E, 0xF57D4F7F,
        0xEE6ED178, 0x06F067AA, 0x72176FBA, 0x0A637DC5, 0xA2C898A6,
        0x113F9804, 0xBEF90DAE, 0x1B710B35, 0x131C471B, 0x28DB77F5,
        0x23047D84, 0x32CAAB7B, 0x40C72493, 0x3C9EBE0A, 0x15C9BEBC,
        0x431D67C4, 0x9C100D4C, 0x4CC5D4BE, 0xCB3E42B6, 0x597F299C,
        0xFC657E2A, 0x5FCB6FAB, 0x3AD6FAEC, 0x6C44198C, 0x4A475817
    };
    int     t, t2, t8;                  /* Loop counter */
    uint32_t  temp1[2], temp2[2],       /* Temporary word values */
        temp3[2], temp4[2], temp5[2];
    uint32_t  W[2 * 80];                  /* Word sequence */
    uint32_t  A[2], B[2], C[2], D[2],   /* Word buffers */
        E[2], F[2], G[2], H[2];

    /* Initialize the first 16 words in the array W */
    for (t = t2 = t8 = 0; t < 16; t++, t8 += 8) {
        W[t2++] = ((((uint32_t)context->Message_Block[t8])) << 24) |
            ((((uint32_t)context->Message_Block[t8 + 1])) << 16) |
            ((((uint32_t)context->Message_Block[t8 + 2])) << 8) |
            ((((uint32_t)context->Message_Block[t8 + 3])));
        W[t2++] = ((((uint32_t)context->Message_Block[t8 + 4])) << 24) |
            ((((uint32_t)context->Message_Block[t8 + 5])) << 16) |
            ((((uint32_t)context->Message_Block[t8 + 6])) << 8) |
            ((((uint32_t)context->Message_Block[t8 + 7])));
    }

    for (t = 16; t < 80; t++, t2 += 2) {
        /* W[t] = SHA512_sigma1(W[t-2]) + W[t-7] +
        SHA512_sigma0(W[t-15]) + W[t-16]; */
        uint32_t *Wt2 = &W[t2 - 2 * 2];
        uint32_t *Wt7 = &W[t2 - 7 * 2];
        uint32_t *Wt15 = &W[t2 - 15 * 2];
        uint32_t *Wt16 = &W[t2 - 16 * 2];
        SHA512_sigma1(Wt2, temp1);
        SHA512_ADD(temp1, Wt7, temp2);
        SHA512_sigma0(Wt15, temp1);
        SHA512_ADD(temp1, Wt16, temp3);
        SHA512_ADD(temp2, temp3, &W[t2]);
    }

    A[0] = context->Intermediate_Hash[0];
    A[1] = context->Intermediate_Hash[1];
    B[0] = context->Intermediate_Hash[2];
    B[1] = context->Intermediate_Hash[3];
    C[0] = context->Intermediate_Hash[4];
    C[1] = context->Intermediate_Hash[5];
    D[0] = context->Intermediate_Hash[6];
    D[1] = context->Intermediate_Hash[7];
    E[0] = context->Intermediate_Hash[8];
    E[1] = context->Intermediate_Hash[9];
    F[0] = context->Intermediate_Hash[10];
    F[1] = context->Intermediate_Hash[11];
    G[0] = context->Intermediate_Hash[12];
    G[1] = context->Intermediate_Hash[13];
    H[0] = context->Intermediate_Hash[14];
    H[1] = context->Intermediate_Hash[15];

    for (t = t2 = 0; t < 80; t++, t2 += 2) {
        /*
        * temp1 = H + SHA512_SIGMA1(E) + SHA_Ch(E,F,G) + K[t] + W[t];
        */
        SHA512_SIGMA1(E, temp1);
        SHA512_ADD(H, temp1, temp2);
        SHA_Ch(E, F, G, temp3);
        SHA512_ADD(temp2, temp3, temp4);
        SHA512_ADD(&K[t2], &W[t2], temp5);
        SHA512_ADD(temp4, temp5, temp1);
        /*
        * temp2 = SHA512_SIGMA0(A) + SHA_Maj(A,B,C);
        */
        SHA512_SIGMA0(A, temp3);
        SHA_Maj(A, B, C, temp4);
        SHA512_ADD(temp3, temp4, temp2);
        H[0] = G[0]; H[1] = G[1];
        G[0] = F[0]; G[1] = F[1];
        F[0] = E[0]; F[1] = E[1];
        SHA512_ADD(D, temp1, E);
        D[0] = C[0]; D[1] = C[1];
        C[0] = B[0]; C[1] = B[1];
        B[0] = A[0]; B[1] = A[1];
        SHA512_ADD(temp1, temp2, A);
    }

    SHA512_ADDTO2(&context->Intermediate_Hash[0], A);
    SHA512_ADDTO2(&context->Intermediate_Hash[2], B);
    SHA512_ADDTO2(&context->Intermediate_Hash[4], C);
    SHA512_ADDTO2(&context->Intermediate_Hash[6], D);
    SHA512_ADDTO2(&context->Intermediate_Hash[8], E);
    SHA512_ADDTO2(&context->Intermediate_Hash[10], F);



    Eastlake 3rd & Hansen        Informational[Page 62]

        RFC 4634                   SHAs and HMAC - SHAs                  July 2006


        SHA512_ADDTO2(&context->Intermediate_Hash[12], G);
    SHA512_ADDTO2(&context->Intermediate_Hash[14], H);

#else /* !USE_32BIT_ONLY */
    static const uint64_t K[80] = {
        0x428A2F98D728AE22ll, 0x7137449123EF65CDll, 0xB5C0FBCFEC4D3B2Fll,
        0xE9B5DBA58189DBBCll, 0x3956C25BF348B538ll, 0x59F111F1B605D019ll,
        0x923F82A4AF194F9Bll, 0xAB1C5ED5DA6D8118ll, 0xD807AA98A3030242ll,
        0x12835B0145706FBEll, 0x243185BE4EE4B28Cll, 0x550C7DC3D5FFB4E2ll,
        0x72BE5D74F27B896Fll, 0x80DEB1FE3B1696B1ll, 0x9BDC06A725C71235ll,
        0xC19BF174CF692694ll, 0xE49B69C19EF14AD2ll, 0xEFBE4786384F25E3ll,
        0x0FC19DC68B8CD5B5ll, 0x240CA1CC77AC9C65ll, 0x2DE92C6F592B0275ll,
        0x4A7484AA6EA6E483ll, 0x5CB0A9DCBD41FBD4ll, 0x76F988DA831153B5ll,
        0x983E5152EE66DFABll, 0xA831C66D2DB43210ll, 0xB00327C898FB213Fll,
        0xBF597FC7BEEF0EE4ll, 0xC6E00BF33DA88FC2ll, 0xD5A79147930AA725ll,
        0x06CA6351E003826Fll, 0x142929670A0E6E70ll, 0x27B70A8546D22FFCll,
        0x2E1B21385C26C926ll, 0x4D2C6DFC5AC42AEDll, 0x53380D139D95B3DFll,
        0x650A73548BAF63DEll, 0x766A0ABB3C77B2A8ll, 0x81C2C92E47EDAEE6ll,
        0x92722C851482353Bll, 0xA2BFE8A14CF10364ll, 0xA81A664BBC423001ll,
        0xC24B8B70D0F89791ll, 0xC76C51A30654BE30ll, 0xD192E819D6EF5218ll,
        0xD69906245565A910ll, 0xF40E35855771202All, 0x106AA07032BBD1B8ll,
        0x19A4C116B8D2D0C8ll, 0x1E376C085141AB53ll, 0x2748774CDF8EEB99ll,
        0x34B0BCB5E19B48A8ll, 0x391C0CB3C5C95A63ll, 0x4ED8AA4AE3418ACBll,
        0x5B9CCA4F7763E373ll, 0x682E6FF3D6B2B8A3ll, 0x748F82EE5DEFB2FCll,
        0x78A5636F43172F60ll, 0x84C87814A1F0AB72ll, 0x8CC702081A6439ECll,
        0x90BEFFFA23631E28ll, 0xA4506CEBDE82BDE9ll, 0xBEF9A3F7B2C67915ll,
        0xC67178F2E372532Bll, 0xCA273ECEEA26619Cll, 0xD186B8C721C0C207ll,
        0xEADA7DD6CDE0EB1Ell, 0xF57D4F7FEE6ED178ll, 0x06F067AA72176FBAll,
        0x0A637DC5A2C898A6ll, 0x113F9804BEF90DAEll, 0x1B710B35131C471Bll,
        0x28DB77F523047D84ll, 0x32CAAB7B40C72493ll, 0x3C9EBE0A15C9BEBCll,
        0x431D67C49C100D4Cll, 0x4CC5D4BECB3E42B6ll, 0x597F299CFC657E2All,
        0x5FCB6FAB3AD6FAECll, 0x6C44198C4A475817ll
    };
    int        t, t8;                   /* Loop counter */
    uint64_t   temp1, temp2;            /* Temporary word value */
    uint64_t   W[80];                   /* Word sequence */
    uint64_t   A, B, C, D, E, F, G, H;  /* Word buffers */

    /*
    * Initialize the first 16 words in the array W
    */
    for (t = t8 = 0; t < 16; t++, t8 += 8)
        W[t] = ((uint64_t)(context->Message_Block[t8]) << 56) |
        ((uint64_t)(context->Message_Block[t8 + 1]) << 48) |
        ((uint64_t)(context->Message_Block[t8 + 2]) << 40) |
        ((uint64_t)(context->Message_Block[t8 + 3]) << 32) |
        ((uint64_t)(context->Message_Block[t8 + 4]) << 24) |
        ((uint64_t)(context->Message_Block[t8 + 5]) << 16) |
        ((uint64_t)(context->Message_Block[t8 + 6]) << 8) |
        ((uint64_t)(context->Message_Block[t8 + 7]));

    for (t = 16; t < 80; t++)
        W[t] = SHA512_sigma1(W[t - 2]) + W[t - 7] +
        SHA512_sigma0(W[t - 15]) + W[t - 16];

    A = context->Intermediate_Hash[0];
    B = context->Intermediate_Hash[1];
    C = context->Intermediate_Hash[2];
    D = context->Intermediate_Hash[3];
    E = context->Intermediate_Hash[4];
    F = context->Intermediate_Hash[5];
    G = context->Intermediate_Hash[6];
    H = context->Intermediate_Hash[7];

    for (t = 0; t < 80; t++) {
        temp1 = H + SHA512_SIGMA1(E) + SHA_Ch(E, F, G) + K[t] + W[t];
        temp2 = SHA512_SIGMA0(A) + SHA_Maj(A, B, C);
        H = G;
        G = F;
        F = E;
        E = D + temp1;
        D = C;
        C = B;
        B = A;
        A = temp1 + temp2;
    }

    context->Intermediate_Hash[0] += A;
    context->Intermediate_Hash[1] += B;
    context->Intermediate_Hash[2] += C;
    context->Intermediate_Hash[3] += D;
    context->Intermediate_Hash[4] += E;
    context->Intermediate_Hash[5] += F;
    context->Intermediate_Hash[6] += G;
    context->Intermediate_Hash[7] += H;
#endif /* USE_32BIT_ONLY */

    context->Message_Block_Index = 0;
}

/*
* SHA384_512PadMessage
*
* Description:
*   According to the standard, the message must be padded to an
*   even 1024 bits. The first padding bit must be a ‘1‘. The
*   last 128 bits represent the length of the original message.
*   All bits in between should be 0. This helper function will
*   pad the message according to those rules by filling the
*   Message_Block array accordingly. When it returns, it can be
*   assumed that the message digest has been computed.
*
* Parameters:
*   context: [in/out]
*     The context to pad
*   Pad_Byte: [in]
*     The last byte to add to the digest before the 0-padding
*     and length. This will contain the last bits of the message
*     followed by another single bit. If the message was an
*     exact multiple of 8-bits long, Pad_Byte will be 0x80.
*
* Returns:
*   Nothing.
*
*/
static void SHA384_512PadMessage(SHA512Context *context, uint8_t Pad_Byte)
{
    /*
    * Check to see if the current message block is too small to hold
    * the initial padding bits and length. If so, we will pad the
    * block, process it, and then continue padding into a second
    * block.
    */
    if (context->Message_Block_Index >= (SHA512_Message_Block_Size - 16)) {
        context->Message_Block[context->Message_Block_Index++] = Pad_Byte;
        while (context->Message_Block_Index < SHA512_Message_Block_Size)
            context->Message_Block[context->Message_Block_Index++] = 0;
        SHA384_512ProcessMessageBlock(context);
    }
    else
        context->Message_Block[context->Message_Block_Index++] = Pad_Byte;

    while (context->Message_Block_Index < (SHA512_Message_Block_Size - 16))
        context->Message_Block[context->Message_Block_Index++] = 0;

    /*
    * Store the message length as the last 16 octets
    */
#ifdef USE_32BIT_ONLY
    context->Message_Block[112] = (uint8_t)(context->Length[0] >> 24);
    context->Message_Block[113] = (uint8_t)(context->Length[0] >> 16);
    context->Message_Block[114] = (uint8_t)(context->Length[0] >> 8);
    context->Message_Block[115] = (uint8_t)(context->Length[0]);
    context->Message_Block[116] = (uint8_t)(context->Length[1] >> 24);
    context->Message_Block[117] = (uint8_t)(context->Length[1] >> 16);
    context->Message_Block[118] = (uint8_t)(context->Length[1] >> 8);
    context->Message_Block[119] = (uint8_t)(context->Length[1]);

    context->Message_Block[120] = (uint8_t)(context->Length[2] >> 24);
    context->Message_Block[121] = (uint8_t)(context->Length[2] >> 16);
    context->Message_Block[122] = (uint8_t)(context->Length[2] >> 8);
    context->Message_Block[123] = (uint8_t)(context->Length[2]);
    context->Message_Block[124] = (uint8_t)(context->Length[3] >> 24);
    context->Message_Block[125] = (uint8_t)(context->Length[3] >> 16);
    context->Message_Block[126] = (uint8_t)(context->Length[3] >> 8);
    context->Message_Block[127] = (uint8_t)(context->Length[3]);
#else /* !USE_32BIT_ONLY */
    context->Message_Block[112] = (uint8_t)(context->Length_High >> 56);
    context->Message_Block[113] = (uint8_t)(context->Length_High >> 48);
    context->Message_Block[114] = (uint8_t)(context->Length_High >> 40);
    context->Message_Block[115] = (uint8_t)(context->Length_High >> 32);
    context->Message_Block[116] = (uint8_t)(context->Length_High >> 24);
    context->Message_Block[117] = (uint8_t)(context->Length_High >> 16);
    context->Message_Block[118] = (uint8_t)(context->Length_High >> 8);
    context->Message_Block[119] = (uint8_t)(context->Length_High);

    context->Message_Block[120] = (uint8_t)(context->Length_Low >> 56);
    context->Message_Block[121] = (uint8_t)(context->Length_Low >> 48);
    context->Message_Block[122] = (uint8_t)(context->Length_Low >> 40);
    context->Message_Block[123] = (uint8_t)(context->Length_Low >> 32);
    context->Message_Block[124] = (uint8_t)(context->Length_Low >> 24);
    context->Message_Block[125] = (uint8_t)(context->Length_Low >> 16);
    context->Message_Block[126] = (uint8_t)(context->Length_Low >> 8);
    context->Message_Block[127] = (uint8_t)(context->Length_Low);
#endif /* USE_32BIT_ONLY */
    SHA384_512ProcessMessageBlock(context);
}



/*
* SHA384_512Finalize
*
* Description:
*   This helper function finishes off the digest calculations.



Eastlake 3rd & Hansen        Informational                     [Page 56]

 RFC 4634                   SHAs and HMAC-SHAs                  July 2006


 *
 * Parameters:
 *   context: [in/out]
 *     The SHA context to update
 *   Pad_Byte: [in]
 *     The last byte to add to the digest before the 0-padding
 *     and length. This will contain the last bits of the message
 *     followed by another single bit. If the message was an
 *     exact multiple of 8-bits long, Pad_Byte will be 0x80.
 *
 * Returns:
 *   sha Error Code.
 *
 */
static void SHA384_512Finalize(SHA512Context *context, uint8_t Pad_Byte)
{
    int_least16_t i;
    SHA384_512PadMessage(context, Pad_Byte);
    /* message may be sensitive, clear it out */
    for (i = 0; i < SHA512_Message_Block_Size; ++i)
        context->Message_Block[i] = 0;
#ifdef USE_32BIT_ONLY    /* and clear length */
    context->Length[0] = context->Length[1] = 0;
    context->Length[2] = context->Length[3] = 0;
#else /* !USE_32BIT_ONLY */
    context->Length_Low = 0;
    context->Length_High = 0;
#endif /* USE_32BIT_ONLY */
    context->Computed = 1;
}

/*
* SHA384_512ResultN
*
* Description:
*   This helper function will return the 384-bit or 512-bit message



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 RFC 4634                   SHAs and HMAC-SHAs                  July 2006


 *   digest into the Message_Digest array provided by the caller.
 *   NOTE: The first octet of hash is stored in the 0th element,
 *      the last octet of hash in the 48th/64th element.
 *
 * Parameters:
 *   context: [in/out]
 *     The context to use to calculate the SHA hash.
 *   Message_Digest: [out]
 *     Where the digest is returned.
 *   HashSize: [in]
 *     The size of the hash, either 48 or 64.
 *
 * Returns:
 *   sha Error Code.
 *
 */
static int SHA384_512ResultN(SHA512Context *context,uint8_t Message_Digest[], int HashSize)
{
    int i;

#ifdef USE_32BIT_ONLY
    int i2;
#endif /* USE_32BIT_ONLY */

    if (!context || !Message_Digest)
        return shaNull;

    if (context->Corrupted)
        return context->Corrupted;

    if (!context->Computed)
        SHA384_512Finalize(context, 0x80);

#ifdef USE_32BIT_ONLY
    for (i = i2 = 0; i < HashSize;) {
        Message_Digest[i++] = (uint8_t)(context->Intermediate_Hash[i2] >> 24);
        Message_Digest[i++] = (uint8_t)(context->Intermediate_Hash[i2] >> 16);
        Message_Digest[i++] = (uint8_t)(context->Intermediate_Hash[i2] >> 8);
        Message_Digest[i++] = (uint8_t)(context->Intermediate_Hash[i2++]);
        Message_Digest[i++] = (uint8_t)(context->Intermediate_Hash[i2] >> 24);
        Message_Digest[i++] = (uint8_t)(context->Intermediate_Hash[i2] >> 16);
        Message_Digest[i++] = (uint8_t)(context->Intermediate_Hash[i2] >> 8);
        Message_Digest[i++] = (uint8_t)(context->Intermediate_Hash[i2++]);
    }
#else /* !USE_32BIT_ONLY */
    for (i = 0; i < HashSize; ++i)
        Message_Digest[i] = (uint8_t)(context->Intermediate_Hash[i >> 3] >> 8 * (7 - (i % 8)));
#endif /* USE_32BIT_ONLY */

    return shaSuccess;
}

/*
* SHA512Reset
*
* Description:
*   This function will initialize the SHA512Context in preparation
*   for computing a new SHA512 message digest.
*
* Parameters:
*   context: [in/out]
*     The context to reset.
*
* Returns:
*   sha Error Code.
*
*/
int SHA512Reset(SHA512Context *context)
{
    int i;
    if (!context)
        return shaNull;

    context->Message_Block_Index = 0;
    context->Length_High = context->Length_Low = 0;

    for (i = 0; i < SHA512HashSize / 8; i++)
        context->Intermediate_Hash[i] = SHA512_H0[i];

    context->Computed = 0;
    context->Corrupted = 0;

    return shaSuccess;
}

/*
* SHA512Input
*
* Description:
*   This function accepts an array of octets as the next portion 字节数组
*   of the message.
*
* Parameters:
*   context: [in/out]
*     The SHA context to update
*   message_array: [in]
*     An array of characters representing the next portion of
*     the message.
*   length: [in]
*     The length of the message in message_array
*
* Returns:
*   sha Error Code.



Eastlake 3rd & Hansen        Informational                     [Page 54]

 RFC 4634                   SHAs and HMAC-SHAs                  July 2006


 *
 */
int SHA512Input(SHA512Context *context, const uint8_t *message_array, unsigned int length)
{
    if (!length)
        return shaSuccess;

    if (!context || !message_array)
        return shaNull;

    if (context->Computed) {
        context->Corrupted = shaStateError;
        return shaStateError;
    }

    if (context->Corrupted)
        return context->Corrupted;

    while (length-- && !context->Corrupted) {
        context->Message_Block[context->Message_Block_Index++] =(*message_array & 0xFF);

        if (!SHA384_512AddLength(context, 8) &&(context->Message_Block_Index == SHA512_Message_Block_Size))
            SHA384_512ProcessMessageBlock(context);

        message_array++;
    }

    return shaSuccess;
}

/*
* SHA512FinalBits
*
* Description:
*   This function will add in any final bits of the message.
*
* Parameters:
*   context: [in/out]
*     The SHA context to update
*   message_bits: [in]
*     The final bits of the message, in the upper portion of the
*     byte. (Use 0b###00000 instead of 0b00000### to input the
*     three bits ###.)
*   length: [in]



Eastlake 3rd & Hansen        Informational                     [Page 55]

 RFC 4634                   SHAs and HMAC-SHAs                  July 2006


 *     The number of bits in message_bits, between 1 and 7.
 *
 * Returns:
 *   sha Error Code.
 *
 */
int SHA512FinalBits(SHA512Context *context,const uint8_t message_bits, unsigned int length)
{
    uint8_t masks[8] = {
        /* 0 0b00000000 */ 0x00, /* 1 0b10000000 */ 0x80,
        /* 2 0b11000000 */ 0xC0, /* 3 0b11100000 */ 0xE0,
        /* 4 0b11110000 */ 0xF0, /* 5 0b11111000 */ 0xF8,
        /* 6 0b11111100 */ 0xFC, /* 7 0b11111110 */ 0xFE
    };
    uint8_t markbit[8] = {
        /* 0 0b10000000 */ 0x80, /* 1 0b01000000 */ 0x40,
        /* 2 0b00100000 */ 0x20, /* 3 0b00010000 */ 0x10,
        /* 4 0b00001000 */ 0x08, /* 5 0b00000100 */ 0x04,
        /* 6 0b00000010 */ 0x02, /* 7 0b00000001 */ 0x01
    };

    if (!length)
        return shaSuccess;

    if (!context)
        return shaNull;

    if ((context->Computed) || (length >= 8) || (length == 0)) {
        context->Corrupted = shaStateError;
        return shaStateError;
    }

    if (context->Corrupted)
        return context->Corrupted;

    SHA384_512AddLength(context, length);
    SHA384_512Finalize(context, (uint8_t)((message_bits & masks[length]) | markbit[length]));

    return shaSuccess;
}

/*
* SHA512Result
*
* Description:
*   This function will return the 512-bit message
*   digest into the Message_Digest array provided by the caller.
*   NOTE: The first octet of hash is stored in the 0th element,
*      the last octet of hash in the 64th element.
*
* Parameters:
*   context: [in/out]
*     The context to use to calculate the SHA hash.
*   Message_Digest: [out]
*     Where the digest is returned.
*
* Returns:
*   sha Error Code.
*
*/
int SHA512Result(SHA512Context *context, uint8_t Message_Digest[SHA512HashSize])
{
    return SHA384_512ResultN(context, Message_Digest, SHA512HashSize);
}
static const char hexdigits[] = "0123456789ABCDEF";

int SHA512STR(SHA512Context *context, uint8_t Message_Digest[SHA512HashSize], const uint8_t *message_array){
    int length = strlen((const char*)message_array);
    SHA_enum err = shaSuccess;
    err = (SHA_enum)SHA512Reset(context);
    printf("SHA512_reset:%d\n", err);
    err = (SHA_enum)SHA512Input(context, message_array, length);
    printf("SHA512_Input:%d\n", err);
    err = (SHA_enum)SHA512FinalBits(context, 0, 0);
    printf("SHA512_Finalbits:%d\n", err);
    err = (SHA_enum)SHA512Result(context, Message_Digest);
    printf("SHA512_result:%d\n", err);
    return 0;
}

int SHA512FILE(SHA512Context *context, uint8_t Message_Digest[SHA512HashSize], const char *filepath, int filesize){
    FILE *fp;
    errno_t err = 0;
    uint8_t *message_array = new uint8_t(filesize);
    if (err = fopen_s(&fp, filepath, "r")){
        printf("open file error!");
        return 0;
    }
    fgets((char*)message_array, filesize,fp);
    SHA512STR(context, Message_Digest, message_array);
    return 0;
}
int main(){
    uint8_t Message_Digest[SHA512HashSize] = {};
    SHA512Context *test = new SHA512Context;
    uint8_t message_array[10] = "abc";
    SHA512Reset(test);
    SHA512Input(test, message_array, 3);//测试消息“abc”的长度是3个字节
    SHA512FinalBits(test,0,0);//一般情况下这一句可以不用加，只有在消息长度（以bit为单位）不是8的整数倍时才用
    SHA512Result(test, Message_Digest);
    for (int i = 0; i < SHA512HashSize; ++i) {
            putchar(hexdigits[(Message_Digest[i] >> 4) & 0xF]);
            putchar(hexdigits[Message_Digest[i] & 0xF]);
            putchar(‘ ‘);
        }
    return 0;
}