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/*

SHA-1 in C

By Steve Reid 

100% Public Domain

-----------------

Modified 7/98

By James H. Brown 

Still 100% Public Domain

Corrected a problem which generated improper hash values on 16 bit machines

Routine SHA1Update changed from

	void SHA1Update(SHA1_CTX* context, unsigned char* data, unsigned int

len)

to

	void SHA1Update(SHA1_CTX* context, unsigned char* data, unsigned

long len)

The 'len' parameter was declared an int which works fine on 32 bit machines.

However, on 16 bit machines an int is too small for the shifts being done

against

it.  This caused the hash function to generate incorrect values if len was

greater than 8191 (8K - 1) due to the 'len << 3' on line 3 of SHA1Update().

Since the file IO in main() reads 16K at a time, any file 8K or larger would

be guaranteed to generate the wrong hash (e.g. Test Vector #3, a million

"a"s).

I also changed the declaration of variables i & j in SHA1Update to

unsigned long from unsigned int for the same reason.

These changes should make no difference to any 32 bit implementations since

an

int and a long are the same size in those environments.

--

I also corrected a few compiler warnings generated by Borland C.

1. Added #include  for exit() prototype

2. Removed unused variable 'j' in SHA1Final

3. Changed exit(0) to return(0) at end of main.

ALL changes I made can be located by searching for comments containing 'JHB'

-----------------

Modified 8/98

By Steve Reid 

Still 100% public domain

1- Removed #include  and used return() instead of exit()

2- Fixed overwriting of finalcount in SHA1Final() (discovered by Chris Hall)

3- Changed email address from steve@edmweb.com to sreid@sea-to-sky.net

-----------------

Modified 4/01

By Saul Kravitz 

Still 100% PD

Modified to run on Compaq Alpha hardware.

-----------------

Modified 07/2002

By Ralph Giles 

Still 100% public domain

modified for use with stdint types, autoconf

code cleanup, removed attribution comments

switched SHA1Final() argument order for consistency

use SHA1_ prefix for public api

move public api to sha1.h

*/

/*

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 SHA1HANDSOFF  */

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include 

#include 

#include "os_types.h"

#include "sha1.h"

void SHA1_Transform(uint32_t state[5], const uint8_t buffer[64]);

#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 */

/* FIXME: can we do this in an endian-proof way? */

#ifdef WORDS_BIGENDIAN

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

#else

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

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

#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);

#ifdef VERBOSE  /* SAK */

void SHAPrintContext(SHA1_CTX *context, char *msg){

  printf("%s (%d,%d) %x %x %x %x %x\n",

	 msg,

	 context->count[0], context->count[1],

	 context->state[0],

	 context->state[1],

	 context->state[2],

	 context->state[3],

	 context->state[4]);

}

#endif /* VERBOSE */

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

void SHA1_Transform(uint32_t state[5], const uint8_t buffer[64])

{

    uint32_t a, b, c, d, e;

    typedef union {

        uint8_t c[64];

        uint32_t l[16];

    } CHAR64LONG16;

    CHAR64LONG16* block;

#ifdef SHA1HANDSOFF

    static uint8_t workspace[64];

    block = (CHAR64LONG16*)workspace;

    memcpy(block, buffer, 64);

#else

    block = (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;

}

/* SHA1Init - Initialize new context */

void SHA1_Init(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 SHA1_Update(SHA1_CTX* context, const uint8_t* data, const size_t len)

{

    size_t i, j;

#ifdef VERBOSE

    SHAPrintContext(context, "before");

#endif

    j = (context->count[0] >> 3) & 63;

    if ((context->count[0] += len << 3) < (len << 3)) context->count[1]++;

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

    if ((j + len) > 63) {

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

        SHA1_Transform(context->state, context->buffer);

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

            SHA1_Transform(context->state, data + i);

        }

        j = 0;

    }

    else i = 0;

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

#ifdef VERBOSE

    SHAPrintContext(context, "after ");

#endif

}

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

void SHA1_Final(SHA1_CTX* context, uint8_t digest[SHA1_DIGEST_SIZE])

{

    uint32_t i;

    uint8_t  finalcount[8];

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

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

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

    }

    SHA1_Update(context, (uint8_t *)"\200", 1);

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

        SHA1_Update(context, (uint8_t *)"\0", 1);

    }

    SHA1_Update(context, finalcount, 8);  /* Should cause a SHA1_Transform() */

    for (i = 0; i < SHA1_DIGEST_SIZE; i++) {

        digest[i] = (uint8_t)

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

    }

    /* Wipe variables */

    i = 0;

    memset(context->buffer, 0, 64);

    memset(context->state, 0, 20);

    memset(context->count, 0, 8);

    memset(finalcount, 0, 8);	/* SWR */

#ifdef SHA1HANDSOFF  /* make SHA1Transform overwrite its own static vars */

    SHA1_Transform(context->state, context->buffer);

#endif

}

/*************************************************************/

#if 0

int main(int argc, char** argv)

{

int i, j;

SHA1_CTX context;

unsigned char digest[SHA1_DIGEST_SIZE], buffer[16384];

FILE* file;

    if (argc > 2) {

        puts("Public domain SHA-1 implementation - by Steve Reid ");

        puts("Modified for 16 bit environments 7/98 - by James H. Brown ");	/* JHB */

        puts("Produces the SHA-1 hash of a file, or stdin if no file is specified.");

        return(0);

    }

    if (argc < 2) {

        file = stdin;

    }

    else {

        if (!(file = fopen(argv[1], "rb"))) {

            fputs("Unable to open file.", stderr);

            return(-1);

        }

    }

    SHA1_Init(&context);

    while (!feof(file)) {  /* note: what if ferror(file) */

        i = fread(buffer, 1, 16384, file);

        SHA1_Update(&context, buffer, i);

    }

    SHA1_Final(&context, digest);

    fclose(file);

    for (i = 0; i < SHA1_DIGEST_SIZE/4; i++) {

        for (j = 0; j < 4; j++) {

            printf("%02X", digest[i*4+j]);

        }

        putchar(' ');

    }

    putchar('\n');

    return(0);	/* JHB */

}

#endif

/* self test */

#ifdef TEST

static char *test_data[] = {

    "abc",

    "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq",

    "A million repetitions of 'a'"};

static char *test_results[] = {

    "A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D",

    "84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1",

    "34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F"};

void digest_to_hex(const uint8_t digest[SHA1_DIGEST_SIZE], char *output)

{

    int i,j;

    char *c = output;

    for (i = 0; i < SHA1_DIGEST_SIZE/4; i++) {

        for (j = 0; j < 4; j++) {

            sprintf(c,"%02X", digest[i*4+j]);

            c += 2;

        }

        sprintf(c, " ");

        c += 1;

    }

    *(c - 1) = '\0';

}

int main(int argc, char** argv)

{

    int k;

    SHA1_CTX context;

    uint8_t digest[20];

    char output[80];

    fprintf(stdout, "verifying SHA-1 implementation... ");

    for (k = 0; k < 2; k++){

        SHA1_Init(&context);

        SHA1_Update(&context, (uint8_t*)test_data[k], strlen(test_data[k]));

        SHA1_Final(&context, digest);

	digest_to_hex(digest, output);

        if (strcmp(output, test_results[k])) {

            fprintf(stdout, "FAIL\n");

            fprintf(stderr,"* hash of \"%s\" incorrect:\n", test_data[k]);

            fprintf(stderr,"\t%s returned\n", output);

            fprintf(stderr,"\t%s is correct\n", test_results[k]);

            return (1);

        }

    }

    /* million 'a' vector we feed separately */

    SHA1_Init(&context);

    for (k = 0; k < 1000000; k++)

        SHA1_Update(&context, (uint8_t*)"a", 1);

    SHA1_Final(&context, digest);

    digest_to_hex(digest, output);

    if (strcmp(output, test_results[2])) {

        fprintf(stdout, "FAIL\n");

        fprintf(stderr,"* hash of \"%s\" incorrect:\n", test_data[2]);

        fprintf(stderr,"\t%s returned\n", output);

        fprintf(stderr,"\t%s is correct\n", test_results[2]);

        return (1);

    }

    /* success */

    fprintf(stdout, "ok\n");

    return(0);

}

#endif /* TEST */