用开源的算法代替openssl里面的sha1算法

有时候不想直接调用系统中自带的sha1的算法，从网上找了开源的sha1，将其编译到自己的代码中，这样可以省去对库libcrypto.so的引用。可直接下载代码

代码如下：

sha1.h:

#ifndef _SHA1_H_#define _SHA1_H_/*  *  This structure will hold context information for the hashing *  operation */typedef struct SHA1Context{    unsigned Message_Digest[5]; /* Message Digest (output)          */    unsigned Length_Low;        /* Message length in bits           */    unsigned Length_High;       /* Message length in bits           */    unsigned char Message_Block[64]; /* 512-bit message blocks      */    int Message_Block_Index;    /* Index into message block array   */    int Computed;               /* Is the digest computed?          */    int Corrupted;              /* Is the message digest corruped?  */} SHA1Context;/* *  Function Prototypes */void SHA1Reset(SHA1Context *);int SHA1Result(SHA1Context *);void SHA1Input( SHA1Context *,                const unsigned char *,                unsigned);#endif

sha1.c

#include "sha1.h"/* *  Define the circular shift macro */#define SHA1CircularShift(bits,word) \                ((((word) << (bits)) & 0xFFFFFFFF) | \                ((word) >> (32-(bits))))/* Function prototypes */void SHA1ProcessMessageBlock(SHA1Context *);void SHA1PadMessage(SHA1Context *);/*   *  SHA1Reset * *  Description: *      This function will initialize the SHA1Context in preparation *      for computing a new message digest. * *  Parameters: *      context: [in/out] *          The context to reset. * *  Returns: *      Nothing. * *  Comments: * */void SHA1Reset(SHA1Context *context){    context->Length_Low             = 0;    context->Length_High            = 0;    context->Message_Block_Index    = 0;    context->Message_Digest[0]      = 0x67452301;    context->Message_Digest[1]      = 0xEFCDAB89;    context->Message_Digest[2]      = 0x98BADCFE;    context->Message_Digest[3]      = 0x10325476;    context->Message_Digest[4]      = 0xC3D2E1F0;    context->Computed   = 0;    context->Corrupted  = 0;}/*   *  SHA1Result * *  Description: *      This function will return the 160-bit message digest into the *      Message_Digest array within the SHA1Context provided * *  Parameters: *      context: [in/out] *          The context to use to calculate the SHA-1 hash. * *  Returns: *      1 if successful, 0 if it failed. * *  Comments: * */int SHA1Result(SHA1Context *context){    if (context->Corrupted)    {        return 0;    }    if (!context->Computed)    {        SHA1PadMessage(context);        context->Computed = 1;    }    return 1;}/*   *  SHA1Input * *  Description: *      This function accepts an array of octets as the next portion of *      the message. * *  Parameters: *      context: [in/out] *          The SHA-1 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: *      Nothing. * *  Comments: * */void SHA1Input(     SHA1Context         *context,                    const unsigned char *message_array,                    unsigned            length){    if (!length)    {        return;    }    if (context->Computed || context->Corrupted)    {        context->Corrupted = 1;        return;    }    while(length-- && !context->Corrupted)    {        context->Message_Block[context->Message_Block_Index++] =                                                (*message_array & 0xFF);        context->Length_Low += 8;        /* Force it to 32 bits */        context->Length_Low &= 0xFFFFFFFF;        if (context->Length_Low == 0)        {            context->Length_High++;            /* Force it to 32 bits */            context->Length_High &= 0xFFFFFFFF;            if (context->Length_High == 0)            {                /* Message is too long */                context->Corrupted = 1;            }        }        if (context->Message_Block_Index == 64)        {            SHA1ProcessMessageBlock(context);        }        message_array++;    }}/*   *  SHA1ProcessMessageBlock * *  Description: *      This function will process the next 512 bits of the message *      stored in the Message_Block array. * *  Parameters: *      None. * *  Returns: *      Nothing. * *  Comments: *      Many of the variable names in the SHAContext, especially the *      single character names, were used because those were the names *      used in the publication. *          * */void SHA1ProcessMessageBlock(SHA1Context *context){    const unsigned K[] =            /* Constants defined in SHA-1   */          {        0x5A827999,        0x6ED9EBA1,        0x8F1BBCDC,        0xCA62C1D6    };    int         t;                  /* Loop counter                 */    unsigned    temp;               /* Temporary word value         */    unsigned    W[80];              /* Word sequence                */    unsigned    A, B, C, D, E;      /* Word buffers                 */    /*     *  Initialize the first 16 words in the array W     */    for(t = 0; t < 16; t++)    {        W[t] = ((unsigned) context->Message_Block[t * 4]) << 24;        W[t] |= ((unsigned) context->Message_Block[t * 4 + 1]) << 16;        W[t] |= ((unsigned) context->Message_Block[t * 4 + 2]) << 8;        W[t] |= ((unsigned) context->Message_Block[t * 4 + 3]);    }    for(t = 16; t < 80; t++)    {       W[t] = SHA1CircularShift(1,W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16]);    }    A = context->Message_Digest[0];    B = context->Message_Digest[1];    C = context->Message_Digest[2];    D = context->Message_Digest[3];    E = context->Message_Digest[4];    for(t = 0; t < 20; t++)    {        temp =  SHA1CircularShift(5,A) +                ((B & C) | ((~B) & D)) + E + W[t] + K[0];        temp &= 0xFFFFFFFF;        E = D;        D = C;        C = SHA1CircularShift(30,B);        B = A;        A = temp;    }    for(t = 20; t < 40; t++)    {        temp = SHA1CircularShift(5,A) + (B ^ C ^ D) + E + W[t] + K[1];        temp &= 0xFFFFFFFF;        E = D;        D = C;        C = SHA1CircularShift(30,B);        B = A;        A = temp;    }    for(t = 40; t < 60; t++)    {        temp = SHA1CircularShift(5,A) +               ((B & C) | (B & D) | (C & D)) + E + W[t] + K[2];        temp &= 0xFFFFFFFF;        E = D;        D = C;        C = SHA1CircularShift(30,B);        B = A;        A = temp;    }    for(t = 60; t < 80; t++)    {        temp = SHA1CircularShift(5,A) + (B ^ C ^ D) + E + W[t] + K[3];        temp &= 0xFFFFFFFF;        E = D;        D = C;        C = SHA1CircularShift(30,B);        B = A;        A = temp;    }    context->Message_Digest[0] =                        (context->Message_Digest[0] + A) & 0xFFFFFFFF;    context->Message_Digest[1] =                        (context->Message_Digest[1] + B) & 0xFFFFFFFF;    context->Message_Digest[2] =                        (context->Message_Digest[2] + C) & 0xFFFFFFFF;    context->Message_Digest[3] =                        (context->Message_Digest[3] + D) & 0xFFFFFFFF;    context->Message_Digest[4] =                        (context->Message_Digest[4] + E) & 0xFFFFFFFF;    context->Message_Block_Index = 0;}/*   *  SHA1PadMessage * *  Description: *      According to the standard, the message must be padded to an even *      512 bits.  The first padding bit must be a '1'.  The last 64 *      bits represent the length of the original message.  All bits in *      between should be 0.  This function will pad the message *      according to those rules by filling the Message_Block array *      accordingly.  It will also call SHA1ProcessMessageBlock() *      appropriately.  When it returns, it can be assumed that the *      message digest has been computed. * *  Parameters: *      context: [in/out] *          The context to pad * *  Returns: *      Nothing. * *  Comments: * */void SHA1PadMessage(SHA1Context *context){    /*     *  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 > 55)    {        context->Message_Block[context->Message_Block_Index++] = 0x80;        while(context->Message_Block_Index < 64)        {            context->Message_Block[context->Message_Block_Index++] = 0;        }        SHA1ProcessMessageBlock(context);        while(context->Message_Block_Index < 56)        {            context->Message_Block[context->Message_Block_Index++] = 0;        }    }    else    {        context->Message_Block[context->Message_Block_Index++] = 0x80;        while(context->Message_Block_Index < 56)        {            context->Message_Block[context->Message_Block_Index++] = 0;        }    }    /*     *  Store the message length as the last 8 octets     */    context->Message_Block[56] = (context->Length_High >> 24) & 0xFF;    context->Message_Block[57] = (context->Length_High >> 16) & 0xFF;    context->Message_Block[58] = (context->Length_High >> 8) & 0xFF;    context->Message_Block[59] = (context->Length_High) & 0xFF;    context->Message_Block[60] = (context->Length_Low >> 24) & 0xFF;    context->Message_Block[61] = (context->Length_Low >> 16) & 0xFF;    context->Message_Block[62] = (context->Length_Low >> 8) & 0xFF;    context->Message_Block[63] = (context->Length_Low) & 0xFF;    SHA1ProcessMessageBlock(context);}

读取文件并产生40位的摘要：

    int fd;    u_char *old;    LOG_INFO("verify the file(%s) of key: %s", file, hashkey.c_str());        fd = open(file, O_RDONLY, 0);    if(fd < 0)    {        LOG_ERROR("open the file(%s) failed.", file);        return -1;    }    int oldsize = lseek(fd, 0, SEEK_END);    if((old = (u_char *)malloc(oldsize)) == NULL)    {                LOG_ERROR("malloc file failed(%s)!.\n", file);         close(fd);        return -1;        }        lseek(fd, 0, SEEK_SET);    if(read(fd, old, oldsize) != oldsize)    {        LOG_ERROR("read file failed(%s)!.\n", file);         free(old);        close(fd);        return -1;     }    SHA1Context sha;    int i;    SHA1Reset(&sha);    SHA1Input(&sha, (const unsigned char *)old, oldsize);    char shaString[20 * 2 + 1] = {0};    if(!SHA1Result(&sha))    {        LOG_ERROR("could not compute message digest");        return -1;    }    else    {        for(i = 0; i < 5 ; i++)        {            sprintf(&shaString[i*8], "%08x", sha.Message_Digest[i]);        }    }