[redis.git] / sha1.c


/* 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 */
#if defined(__sun)
#include "solarisfixes.h"
#endif
#include "sha1.h"

#ifndef BYTE_ORDER
#if (BSD >= 199103)
# include <machine/endian.h>
#else
#if defined(linux) || defined(__linux__)
# include <endian.h>
#else
#define	LITTLE_ENDIAN	1234	/* least-significant byte first (vax, pc) */
#define	BIG_ENDIAN	4321	/* most-significant byte first (IBM, net) */
#define	PDP_ENDIAN	3412	/* LSB first in word, MSW first in long (pdp)*/

#if defined(vax) || defined(ns32000) || defined(sun386) || defined(__i386__) || \
    defined(MIPSEL) || defined(_MIPSEL) || defined(BIT_ZERO_ON_RIGHT) || \
    defined(__alpha__) || defined(__alpha)
#define BYTE_ORDER	LITTLE_ENDIAN
#endif

#if defined(sel) || defined(pyr) || defined(mc68000) || defined(sparc) || \
    defined(is68k) || defined(tahoe) || defined(ibm032) || defined(ibm370) || \
    defined(MIPSEB) || defined(_MIPSEB) || defined(_IBMR2) || defined(DGUX) ||\
    defined(apollo) || defined(__convex__) || defined(_CRAY) || \
    defined(__hppa) || defined(__hp9000) || \
    defined(__hp9000s300) || defined(__hp9000s700) || \
    defined (BIT_ZERO_ON_LEFT) || defined(m68k) || defined(__sparc)
#define BYTE_ORDER	BIG_ENDIAN
#endif
#endif /* linux */
#endif /* BSD */
#endif /* BYTE_ORDER */

#if defined(__BYTE_ORDER) && !defined(BYTE_ORDER)
#if (__BYTE_ORDER == __LITTLE_ENDIAN)
#define BYTE_ORDER LITTLE_ENDIAN
#else
#define BYTE_ORDER BIG_ENDIAN
#endif
#endif

#if !defined(BYTE_ORDER) || \
    (BYTE_ORDER != BIG_ENDIAN && BYTE_ORDER != LITTLE_ENDIAN && \
    BYTE_ORDER != PDP_ENDIAN)
	/* you must determine what the correct bit order is for
	 * your compiler - the next line is an intentional error
	 * which will force your compiles to bomb until you fix
	 * the above macros.
	 */
#error "Undefined or invalid BYTE_ORDER"
#endif

#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 ================ */

#if 0
#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;
}

#endif
Commit	Line	Data
ba798261	1
	2	/* from valgrind tests */
	3
	4	/* ================ sha1.c ================ */
	5	/*
	6	SHA-1 in C
	7	By Steve Reid <steve@edmweb.com>
	8	100% Public Domain
	9
	10	Test Vectors (from FIPS PUB 180-1)
	11	"abc"
	12	A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D
	13	"abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq"
	14	84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1
	15	A million repetitions of "a"
	16	34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F
	17	*/
	18
	19	/* #define LITTLE_ENDIAN * This should be #define'd already, if true. */
	20	/* #define SHA1HANDSOFF * Copies data before messing with it. */
	21
	22	#define SHA1HANDSOFF
	23
	24	#include <stdio.h>
	25	#include <string.h>
	26	#include <sys/types.h> /* for u_int_t /
4993adba PN	27	#if defined(__sun)
	28	#include "solarisfixes.h"
	29	#endif
ba798261	30	#include "sha1.h"
	31
	32	#ifndef BYTE_ORDER
	33	#if (BSD >= 199103)
	34	# include <machine/endian.h>
	35	#else
3863d8ea	36	#if defined(linux) \|\| defined(__linux__)
ba798261	37	# include <endian.h>
	38	#else
	39	#define LITTLE_ENDIAN 1234 /* least-significant byte first (vax, pc) */
	40	#define BIG_ENDIAN 4321 /* most-significant byte first (IBM, net) */
	41	#define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long (pdp)*/
	42
	43	#if defined(vax) \|\| defined(ns32000) \|\| defined(sun386) \|\| defined(__i386__) \|\| \
	44	defined(MIPSEL) \|\| defined(_MIPSEL) \|\| defined(BIT_ZERO_ON_RIGHT) \|\| \
	45	defined(__alpha__) \|\| defined(__alpha)
	46	#define BYTE_ORDER LITTLE_ENDIAN
	47	#endif
	48
	49	#if defined(sel) \|\| defined(pyr) \|\| defined(mc68000) \|\| defined(sparc) \|\| \
	50	defined(is68k) \|\| defined(tahoe) \|\| defined(ibm032) \|\| defined(ibm370) \|\| \
	51	defined(MIPSEB) \|\| defined(_MIPSEB) \|\| defined(_IBMR2) \|\| defined(DGUX) \|\|\
	52	defined(apollo) \|\| defined(__convex__) \|\| defined(_CRAY) \|\| \
	53	defined(__hppa) \|\| defined(__hp9000) \|\| \
	54	defined(__hp9000s300) \|\| defined(__hp9000s700) \|\| \
9caf1a20	55	defined (BIT_ZERO_ON_LEFT) \|\| defined(m68k) \|\| defined(__sparc)
ba798261	56	#define BYTE_ORDER BIG_ENDIAN
	57	#endif
	58	#endif /* linux */
	59	#endif /* BSD */
	60	#endif /* BYTE_ORDER */
	61
8ba40049	62	#if defined(__BYTE_ORDER) && !defined(BYTE_ORDER)
	63	#if (__BYTE_ORDER == __LITTLE_ENDIAN)
	64	#define BYTE_ORDER LITTLE_ENDIAN
	65	#else
	66	#define BYTE_ORDER BIG_ENDIAN
	67	#endif
	68	#endif
	69
ba798261	70	#if !defined(BYTE_ORDER) \|\| \
	71	(BYTE_ORDER != BIG_ENDIAN && BYTE_ORDER != LITTLE_ENDIAN && \
	72	BYTE_ORDER != PDP_ENDIAN)
	73	/* you must determine what the correct bit order is for
	74	* your compiler - the next line is an intentional error
	75	* which will force your compiles to bomb until you fix
	76	* the above macros.
	77	*/
8ba40049	78	#error "Undefined or invalid BYTE_ORDER"
ba798261	79	#endif
	80
	81	#define rol(value, bits) (((value) << (bits)) \| ((value) >> (32 - (bits))))
	82
	83	/* blk0() and blk() perform the initial expand. */
	84	/* I got the idea of expanding during the round function from SSLeay */
	85	#if BYTE_ORDER == LITTLE_ENDIAN
	86	#define blk0(i) (block->l[i] = (rol(block->l[i],24)&0xFF00FF00) \
	87	\|(rol(block->l[i],8)&0x00FF00FF))
	88	#elif BYTE_ORDER == BIG_ENDIAN
	89	#define blk0(i) block->l[i]
	90	#else
	91	#error "Endianness not defined!"
	92	#endif
	93	#define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \
	94	^block->l[(i+2)&15]^block->l[i&15],1))
	95
	96	/* (R0+R1), R2, R3, R4 are the different operations used in SHA1 */
	97	#define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(i)+0x5A827999+rol(v,5);w=rol(w,30);
	98	#define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30);
	99	#define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);
	100	#define R3(v,w,x,y,z,i) z+=(((w\|x)&y)\|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
	101	#define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);
	102
	103
	104	/* Hash a single 512-bit block. This is the core of the algorithm. */
	105
	106	void SHA1Transform(u_int32_t state[5], const unsigned char buffer[64])
	107	{
	108	u_int32_t a, b, c, d, e;
	109	typedef union {
	110	unsigned char c[64];
	111	u_int32_t l[16];
	112	} CHAR64LONG16;
	113	#ifdef SHA1HANDSOFF
	114	CHAR64LONG16 block[1]; /* use array to appear as a pointer */
	115	memcpy(block, buffer, 64);
	116	#else
	117	/* The following had better never be used because it causes the
	118	* pointer-to-const buffer to be cast into a pointer to non-const.
	119	* And the result is written through. I threw a "const" in, hoping
	120	* this will cause a diagnostic.
	121	*/
	122	CHAR64LONG16* block = (const CHAR64LONG16*)buffer;
	123	#endif
	124	/* Copy context->state[] to working vars */
	125	a = state[0];
	126	b = state[1];
	127	c = state[2];
	128	d = state[3];
	129	e = state[4];
	130	/* 4 rounds of 20 operations each. Loop unrolled. */
	131	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);
	132	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);
	133	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);
	134	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);
	135	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);
	136	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);
	137	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);
	138	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);
	139	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);
	140	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);
	141	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);
	142	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);
143	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);
144	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);
145	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);
146	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);
147	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);
148	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);
149	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);
150	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);
151	/* Add the working vars back into context.state[] */
152	state[0] += a;
153	state[1] += b;
154	state[2] += c;
155	state[3] += d;
156	state[4] += e;
157	/* Wipe variables */
158	a = b = c = d = e = 0;
159	#ifdef SHA1HANDSOFF
160	memset(block, '\0', sizeof(block));
161	#endif
162	}
163
164
165	/* SHA1Init - Initialize new context */
166
167	void SHA1Init(SHA1_CTX* context)
168	{
169	/* SHA1 initialization constants */
170	context->state[0] = 0x67452301;
171	context->state[1] = 0xEFCDAB89;
172	context->state[2] = 0x98BADCFE;
173	context->state[3] = 0x10325476;
174	context->state[4] = 0xC3D2E1F0;
175	context->count[0] = context->count[1] = 0;
176	}
177
178
179	/* Run your data through this. */
180
181	void SHA1Update(SHA1_CTX* context, const unsigned char* data, u_int32_t len)
182	{
183	u_int32_t i;
184	u_int32_t j;
185
186	j = context->count[0];
187	if ((context->count[0] += len << 3) < j)
188	context->count[1]++;
189	context->count[1] += (len>>29);
190	j = (j >> 3) & 63;
191	if ((j + len) > 63) {
192	memcpy(&context->buffer[j], data, (i = 64-j));
193	SHA1Transform(context->state, context->buffer);
194	for ( ; i + 63 < len; i += 64) {
195	SHA1Transform(context->state, &data[i]);
196	}
197	j = 0;
198	}
199	else i = 0;
200	memcpy(&context->buffer[j], &data[i], len - i);
201	}
202
203
204	/* Add padding and return the message digest. */
205
206	void SHA1Final(unsigned char digest[20], SHA1_CTX* context)
207	{
208	unsigned i;
209	unsigned char finalcount[8];
210	unsigned char c;
211
212	#if 0 /* untested "improvement" by DHR */
213	/* Convert context->count to a sequence of bytes
214	* in finalcount. Second element first, but
215	* big-endian order within element.
216	* But we do it all backwards.
217	*/
218	unsigned char *fcp = &finalcount[8];
219
220	for (i = 0; i < 2; i++)
221	{
222	u_int32_t t = context->count[i];
223	int j;
224
225	for (j = 0; j < 4; t >>= 8, j++)
226	*--fcp = (unsigned char) t
227	}
228	#else
229	for (i = 0; i < 8; i++) {
230	finalcount[i] = (unsigned char)((context->count[(i >= 4 ? 0 : 1)]
231	>> ((3-(i & 3)) * 8) ) & 255); /* Endian independent */
232	}
233	#endif
234	c = 0200;
235	SHA1Update(context, &c, 1);
236	while ((context->count[0] & 504) != 448) {
237	c = 0000;
238	SHA1Update(context, &c, 1);
239	}
240	SHA1Update(context, finalcount, 8); /* Should cause a SHA1Transform() */
241	for (i = 0; i < 20; i++) {
242	digest[i] = (unsigned char)
243	((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255);
244	}
245	/* Wipe variables */
246	memset(context, '\0', sizeof(*context));
247	memset(&finalcount, '\0', sizeof(finalcount));
248	}
249	/* ================ end of sha1.c ================ */
250
251	#if 0
252	#define BUFSIZE 4096
253
254	int
255	main(int argc, char **argv)
256	{
257	SHA1_CTX ctx;
258	unsigned char hash[20], buf[BUFSIZE];
259	int i;
260
261	for(i=0;i<BUFSIZE;i++)
262	buf[i] = i;
263
264	SHA1Init(&ctx);
265	for(i=0;i<1000;i++)
266	SHA1Update(&ctx, buf, BUFSIZE);
267	SHA1Final(hash, &ctx);
268
269	printf("SHA1=");
270	for(i=0;i<20;i++)
271	printf("%02x", hash[i]);
272	printf("\n");
273	return 0;
274	}
275
276	#endif