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/* from valgrind tests */

/* ================ sha1.c ================ */

/*

SHA-1 in C

By Steve Reid <steve@edmweb.com>

100% Public Domain

Test Vectors (from FIPS PUB 180-1)

"abc"

  A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D

"abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq"

  84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1

A million repetitions of "a"

  34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F

*/

/* #define LITTLE_ENDIAN * This should be #define'd already, if true. */

/* #define SHA1HANDSOFF * Copies data before messing with it. */

#define SHA1HANDSOFF

#include <stdio.h>

#include <string.h>

#include <sys/types.h>        /* for u_int*_t */

/* ================ sha1.h ================ */

/*

SHA-1 in C

By Steve Reid <steve@edmweb.com>

100% Public Domain

*/

typedef struct {

    u_int32_t state[5];

    u_int32_t count[2];

    unsigned char buffer[64];

} SHA1_CTX;

void SHA1Transform(u_int32_t state[5], const unsigned char buffer[64]);

void SHA1Init(SHA1_CTX* context);

void SHA1Update(SHA1_CTX* context, const unsigned char* data, u_int32_t len);

void SHA1Final(unsigned char digest[20], SHA1_CTX* context);

/* ================ end of sha1.h ================ */

#include <endian.h>

#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))

/* blk0() and blk() perform the initial expand. */

/* I got the idea of expanding during the round function from SSLeay */

#if BYTE_ORDER == LITTLE_ENDIAN

#define blk0(i) (block->l[i] = (rol(block->l[i],24)&0xFF00FF00) \

    |(rol(block->l[i],8)&0x00FF00FF))

#elif BYTE_ORDER == BIG_ENDIAN

#define blk0(i) block->l[i]

#else

#error "Endianness not defined!"

#endif

#define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \

    ^block->l[(i+2)&15]^block->l[i&15],1))

/* (R0+R1), R2, R3, R4 are the different operations used in SHA1 */

#define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(i)+0x5A827999+rol(v,5);w=rol(w,30);

#define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30);

#define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);

#define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);

#define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);

/* Hash a single 512-bit block. This is the core of the algorithm. */

void SHA1Transform(u_int32_t state[5], const unsigned char buffer[64])

{

u_int32_t a, b, c, d, e;

typedef union {

    unsigned char c[64];

    u_int32_t l[16];

} CHAR64LONG16;

#ifdef SHA1HANDSOFF

CHAR64LONG16 block[1];  /* use array to appear as a pointer */

    memcpy(block, buffer, 64);

#else

    /* The following had better never be used because it causes the

     * pointer-to-const buffer to be cast into a pointer to non-const.

     * And the result is written through.  I threw a "const" in, hoping

     * this will cause a diagnostic.

     */

CHAR64LONG16* block = (const CHAR64LONG16*)buffer;

#endif

    /* Copy context->state[] to working vars */

    a = state[0];

    b = state[1];

    c = state[2];

    d = state[3];

    e = state[4];

    /* 4 rounds of 20 operations each. Loop unrolled. */

    R0(a,b,c,d,e, 0); R0(e,a,b,c,d, 1); R0(d,e,a,b,c, 2); R0(c,d,e,a,b, 3);

    R0(b,c,d,e,a, 4); R0(a,b,c,d,e, 5); R0(e,a,b,c,d, 6); R0(d,e,a,b,c, 7);

    R0(c,d,e,a,b, 8); R0(b,c,d,e,a, 9); R0(a,b,c,d,e,10); R0(e,a,b,c,d,11);

    R0(d,e,a,b,c,12); R0(c,d,e,a,b,13); R0(b,c,d,e,a,14); R0(a,b,c,d,e,15);

    R1(e,a,b,c,d,16); R1(d,e,a,b,c,17); R1(c,d,e,a,b,18); R1(b,c,d,e,a,19);

    R2(a,b,c,d,e,20); R2(e,a,b,c,d,21); R2(d,e,a,b,c,22); R2(c,d,e,a,b,23);

    R2(b,c,d,e,a,24); R2(a,b,c,d,e,25); R2(e,a,b,c,d,26); R2(d,e,a,b,c,27);

    R2(c,d,e,a,b,28); R2(b,c,d,e,a,29); R2(a,b,c,d,e,30); R2(e,a,b,c,d,31);

    R2(d,e,a,b,c,32); R2(c,d,e,a,b,33); R2(b,c,d,e,a,34); R2(a,b,c,d,e,35);

    R2(e,a,b,c,d,36); R2(d,e,a,b,c,37); R2(c,d,e,a,b,38); R2(b,c,d,e,a,39);

    R3(a,b,c,d,e,40); R3(e,a,b,c,d,41); R3(d,e,a,b,c,42); R3(c,d,e,a,b,43);

    R3(b,c,d,e,a,44); R3(a,b,c,d,e,45); R3(e,a,b,c,d,46); R3(d,e,a,b,c,47);

    R3(c,d,e,a,b,48); R3(b,c,d,e,a,49); R3(a,b,c,d,e,50); R3(e,a,b,c,d,51);

    R3(d,e,a,b,c,52); R3(c,d,e,a,b,53); R3(b,c,d,e,a,54); R3(a,b,c,d,e,55);

    R3(e,a,b,c,d,56); R3(d,e,a,b,c,57); R3(c,d,e,a,b,58); R3(b,c,d,e,a,59);

    R4(a,b,c,d,e,60); R4(e,a,b,c,d,61); R4(d,e,a,b,c,62); R4(c,d,e,a,b,63);

    R4(b,c,d,e,a,64); R4(a,b,c,d,e,65); R4(e,a,b,c,d,66); R4(d,e,a,b,c,67);

    R4(c,d,e,a,b,68); R4(b,c,d,e,a,69); R4(a,b,c,d,e,70); R4(e,a,b,c,d,71);

    R4(d,e,a,b,c,72); R4(c,d,e,a,b,73); R4(b,c,d,e,a,74); R4(a,b,c,d,e,75);

    R4(e,a,b,c,d,76); R4(d,e,a,b,c,77); R4(c,d,e,a,b,78); R4(b,c,d,e,a,79);

    /* Add the working vars back into context.state[] */

    state[0] += a;

    state[1] += b;

    state[2] += c;

    state[3] += d;

    state[4] += e;

    /* Wipe variables */

    a = b = c = d = e = 0;

#ifdef SHA1HANDSOFF

    memset(block, '\0', sizeof(block));

#endif

}

/* SHA1Init - Initialize new context */

void SHA1Init(SHA1_CTX* context)

{

    /* SHA1 initialization constants */

    context->state[0] = 0x67452301;

    context->state[1] = 0xEFCDAB89;

    context->state[2] = 0x98BADCFE;

    context->state[3] = 0x10325476;

    context->state[4] = 0xC3D2E1F0;

    context->count[0] = context->count[1] = 0;

}

/* Run your data through this. */

void SHA1Update(SHA1_CTX* context, const unsigned char* data, u_int32_t len)

{

u_int32_t i;

u_int32_t j;

    j = context->count[0];

    if ((context->count[0] += len << 3) < j)

        context->count[1]++;

    context->count[1] += (len>>29);

    j = (j >> 3) & 63;

    if ((j + len) > 63) {

        memcpy(&context->buffer[j], data, (i = 64-j));

        SHA1Transform(context->state, context->buffer);

        for ( ; i + 63 < len; i += 64) {

            SHA1Transform(context->state, &data[i]);

        }

        j = 0;

    }

    else i = 0;

    memcpy(&context->buffer[j], &data[i], len - i);

}

/* Add padding and return the message digest. */

void SHA1Final(unsigned char digest[20], SHA1_CTX* context)

{

unsigned i;

unsigned char finalcount[8];

unsigned char c;

#if 0        /* untested "improvement" by DHR */

    /* Convert context->count to a sequence of bytes

     * in finalcount.  Second element first, but

     * big-endian order within element.

     * But we do it all backwards.

     */

    unsigned char *fcp = &finalcount[8];

    for (i = 0; i < 2; i++)

    {

        u_int32_t t = context->count[i];

        int j;

        for (j = 0; j < 4; t >>= 8, j++)

            *--fcp = (unsigned char) t;

    }

#else

    for (i = 0; i < 8; i++) {

        finalcount[i] = (unsigned char)((context->count[(i >= 4 ? 0 : 1)]

         >> ((3-(i & 3)) * 8) ) & 255);  /* Endian independent */

    }

#endif

    c = 0200;

    SHA1Update(context, &c, 1);

    while ((context->count[0] & 504) != 448) {

        c = 0000;

        SHA1Update(context, &c, 1);

    }

    SHA1Update(context, finalcount, 8);  /* Should cause a SHA1Transform() */

    for (i = 0; i < 20; i++) {

        digest[i] = (unsigned char)

         ((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255);

    }

    /* Wipe variables */

    memset(context, '\0', sizeof(*context));

    memset(&finalcount, '\0', sizeof(finalcount));

}

/* ================ end of sha1.c ================ */

#define BUFSIZE 4096

int

main(int argc, char **argv)

{

    SHA1_CTX ctx;

    unsigned char hash[20], buf[BUFSIZE];

    int i;

    for(i=0;i<BUFSIZE;i++)

        buf[i] = i;

    SHA1Init(&ctx);

    for(i=0;i<1000;i++)

        SHA1Update(&ctx, buf, BUFSIZE);

    SHA1Final(hash, &ctx);

    printf("SHA1=");

    for(i=0;i<20;i++)

        printf("%02x", hash[i]);

    printf("\n");

    return 0;

}