md5.c

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/*
 * Copyright (C) 2004, 2005, 2007, 2009, 2014  Internet Systems Consortium, Inc. ("ISC")
 * Copyright (C) 2000, 2001  Internet Software Consortium.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

/* $Id: md5.c,v 1.16 2009/02/06 23:47:42 tbox Exp $ */

/*! \file
 * This code implements the MD5 message-digest algorithm.
 * The algorithm is due to Ron Rivest.  This code was
 * written by Colin Plumb in 1993, no copyright is claimed.
 * This code is in the public domain; do with it what you wish.
 *
 * Equivalent code is available from RSA Data Security, Inc.
 * This code has been tested against that, and is equivalent,
 * except that you don't need to include two pages of legalese
 * with every copy.
 *
 * To compute the message digest of a chunk of bytes, declare an
 * MD5Context structure, pass it to MD5Init, call MD5Update as
 * needed on buffers full of bytes, and then call MD5Final, which
 * will fill a supplied 16-byte array with the digest.
 */

#include "config.h"

#include <isc/assertions.h>
#include <isc/md5.h>
#include <isc/platform.h>
#include <isc/string.h>
#include <isc/types.h>

#if PKCS11CRYPTO
#include <pk11/internal.h>
#include <pk11/pk11.h>
#endif

#include <isc/util.h>

#ifdef ISC_PLATFORM_OPENSSLHASH
void
isc_md5_init(isc_md5_t *ctx) {
        RUNTIME_CHECK(EVP_DigestInit(ctx, EVP_md5()) == 1);
}

void
isc_md5_invalidate(isc_md5_t *ctx) {
        EVP_MD_CTX_cleanup(ctx);
}

void
isc_md5_update(isc_md5_t *ctx, const unsigned char *buf, unsigned int len) {
        RUNTIME_CHECK(EVP_DigestUpdate(ctx,
                                       (const void *) buf,
                                       (size_t) len) == 1);
}

void
isc_md5_final(isc_md5_t *ctx, unsigned char *digest) {
        RUNTIME_CHECK(EVP_DigestFinal(ctx, digest, NULL) == 1);
}

#elif PKCS11CRYPTO

void
isc_md5_init(isc_md5_t *ctx) {
        CK_RV rv;
        CK_MECHANISM mech = { CKM_MD5, NULL, 0 };

        RUNTIME_CHECK(pk11_get_session(ctx, OP_DIGEST, ISC_TRUE, ISC_FALSE,
                                       ISC_FALSE, NULL, 0) == ISC_R_SUCCESS);
        PK11_FATALCHECK(pkcs_C_DigestInit, (ctx->session, &mech));
}

void
isc_md5_invalidate(isc_md5_t *ctx) {
        CK_BYTE garbage[ISC_MD5_DIGESTLENGTH];
        CK_ULONG len = ISC_MD5_DIGESTLENGTH;

        if (ctx->handle == NULL)
                return;
        (void) pkcs_C_DigestFinal(ctx->session, garbage, &len);
        memset(garbage, 0, sizeof(garbage));
        pk11_return_session(ctx);
}

void
isc_md5_update(isc_md5_t *ctx, const unsigned char *buf, unsigned int len) {
        CK_RV rv;
        CK_BYTE_PTR pPart;

        DE_CONST(buf, pPart);
        PK11_FATALCHECK(pkcs_C_DigestUpdate,
                        (ctx->session, pPart, (CK_ULONG) len));
}

void
isc_md5_final(isc_md5_t *ctx, unsigned char *digest) {
        CK_RV rv;
        CK_ULONG len = ISC_MD5_DIGESTLENGTH;

        PK11_FATALCHECK(pkcs_C_DigestFinal,
                        (ctx->session, (CK_BYTE_PTR) digest, &len));
        pk11_return_session(ctx);
}

#else

static void
byteSwap(isc_uint32_t *buf, unsigned words)
{
        unsigned char *p = (unsigned char *)buf;

        do {
                *buf++ = (isc_uint32_t)((unsigned)p[3] << 8 | p[2]) << 16 |
                        ((unsigned)p[1] << 8 | p[0]);
                p += 4;
        } while (--words);
}

/*!
 * Start MD5 accumulation.  Set bit count to 0 and buffer to mysterious
 * initialization constants.
 */
void
isc_md5_init(isc_md5_t *ctx) {
        ctx->buf[0] = 0x67452301;
        ctx->buf[1] = 0xefcdab89;
        ctx->buf[2] = 0x98badcfe;
        ctx->buf[3] = 0x10325476;

        ctx->bytes[0] = 0;
        ctx->bytes[1] = 0;
}

void
isc_md5_invalidate(isc_md5_t *ctx) {
        memset(ctx, 0, sizeof(isc_md5_t));
}

/*@{*/
/*! The four core functions - F1 is optimized somewhat */

/* #define F1(x, y, z) (x & y | ~x & z) */
#define F1(x, y, z) (z ^ (x & (y ^ z)))
#define F2(x, y, z) F1(z, x, y)
#define F3(x, y, z) (x ^ y ^ z)
#define F4(x, y, z) (y ^ (x | ~z))
/*@}*/

/*! This is the central step in the MD5 algorithm. */
#define MD5STEP(f,w,x,y,z,in,s) \
         (w += f(x,y,z) + in, w = (w<<s | w>>(32-s)) + x)

/*!
 * The core of the MD5 algorithm, this alters an existing MD5 hash to
 * reflect the addition of 16 longwords of new data.  MD5Update blocks
 * the data and converts bytes into longwords for this routine.
 */
static void
transform(isc_uint32_t buf[4], isc_uint32_t const in[16]) {
        register isc_uint32_t a, b, c, d;

        a = buf[0];
        b = buf[1];
        c = buf[2];
        d = buf[3];

        MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
        MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
        MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
        MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
        MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
        MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
        MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
        MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
        MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
        MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
        MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
        MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
        MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
        MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
        MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
        MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);

        MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
        MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
        MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
        MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
        MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
        MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
        MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
        MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
        MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
        MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
        MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
        MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
        MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
        MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
        MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
        MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);

        MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
        MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
        MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
        MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
        MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
        MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
        MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
        MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
        MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
        MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
        MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
        MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
        MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
        MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
        MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
        MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);

        MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
        MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
        MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
        MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
        MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
        MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
        MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
        MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
        MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
        MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
        MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
        MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
        MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
        MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
        MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
        MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);

        buf[0] += a;
        buf[1] += b;
        buf[2] += c;
        buf[3] += d;
}

/*!
 * Update context to reflect the concatenation of another buffer full
 * of bytes.
 */
void
isc_md5_update(isc_md5_t *ctx, const unsigned char *buf, unsigned int len) {
        isc_uint32_t t;

        /* Update byte count */

        t = ctx->bytes[0];
        if ((ctx->bytes[0] = t + len) < t)
                ctx->bytes[1]++;        /* Carry from low to high */

        t = 64 - (t & 0x3f);    /* Space available in ctx->in (at least 1) */
        if (t > len) {
                memmove((unsigned char *)ctx->in + 64 - t, buf, len);
                return;
        }
        /* First chunk is an odd size */
        memmove((unsigned char *)ctx->in + 64 - t, buf, t);
        byteSwap(ctx->in, 16);
        transform(ctx->buf, ctx->in);
        buf += t;
        len -= t;

        /* Process data in 64-byte chunks */
        while (len >= 64) {
                memmove(ctx->in, buf, 64);
                byteSwap(ctx->in, 16);
                transform(ctx->buf, ctx->in);
                buf += 64;
                len -= 64;
        }

        /* Handle any remaining bytes of data. */
        memmove(ctx->in, buf, len);
}

/*!
 * Final wrapup - pad to 64-byte boundary with the bit pattern
 * 1 0* (64-bit count of bits processed, MSB-first)
 */
void
isc_md5_final(isc_md5_t *ctx, unsigned char *digest) {
        int count = ctx->bytes[0] & 0x3f;    /* Number of bytes in ctx->in */
        unsigned char *p = (unsigned char *)ctx->in + count;

        /* Set the first char of padding to 0x80.  There is always room. */
        *p++ = 0x80;

        /* Bytes of padding needed to make 56 bytes (-8..55) */
        count = 56 - 1 - count;

        if (count < 0) {        /* Padding forces an extra block */
                memset(p, 0, count + 8);
                byteSwap(ctx->in, 16);
                transform(ctx->buf, ctx->in);
                p = (unsigned char *)ctx->in;
                count = 56;
        }
        memset(p, 0, count);
        byteSwap(ctx->in, 14);

        /* Append length in bits and transform */
        ctx->in[14] = ctx->bytes[0] << 3;
        ctx->in[15] = ctx->bytes[1] << 3 | ctx->bytes[0] >> 29;
        transform(ctx->buf, ctx->in);

        byteSwap(ctx->buf, 4);
        memmove(digest, ctx->buf, 16);
        memset(ctx, 0, sizeof(isc_md5_t));      /* In case it's sensitive */
}
#endif

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