erl_md5.c

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/*
 * MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm
 */

/* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
 * rights reserved.
 * 
 * License to copy and use this software is granted provided that it
 * is identified as the "RSA Data Security, Inc. MD5 Message-Digest
 * Algorithm" in all material mentioning or referencing this software
 * or this function.
 * 
 * License is also granted to make and use derivative works provided
 * that such works are identified as "derived from the RSA Data
 * Security, Inc. MD5 Message-Digest Algorithm" in all material
 * mentioning or referencing the derived work.
 * 
 * RSA Data Security, Inc. makes no representations concerning either
 * the merchantability of this software or the suitability of this
 * software for any particular purpose. It is provided "as is"
 * without express or implied warranty of any kind.
 * 
 * These notices must be retained in any copies of any part of this
 * documentation and/or software.
 */

#ifdef HAVE_CONFIG_H
#  include "config.h"
#endif

#include "sys.h"
#include "erl_vm.h"
#include "global.h"
#include "erl_process.h"
#include "error.h"
#include "bif.h"
#include "erl_binary.h"

typedef void *POINTER;

static int update(MD5_CTX* context, Eterm obj);


/*
 * Constants for MD5Transform routine.
 */

#define S11 7
#define S12 12
#define S13 17
#define S14 22
#define S21 5
#define S22 9
#define S23 14
#define S24 20
#define S31 4
#define S32 11
#define S33 16
#define S34 23
#define S41 6
#define S42 10
#define S43 15
#define S44 21

static void MD5Transform(Uint32 [4], unsigned char [64]);
static void Encode(unsigned char *, Uint32 *, unsigned int);
static void Decode(Uint32 *, unsigned char *, unsigned int);

static unsigned char PADDING[64] = {
    0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};

/*
 * F, G, H and I are basic MD5 functions.
 */
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))

/*
 * ROTATE_LEFT rotates x left n bits.
 */
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

/*
 * FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
 * Rotation is separate from addition to prevent recomputation.
 */
#define FF(a, b, c, d, x, s, ac) { \
	(a) += F ((b), (c), (d)) + (x) + (Uint32)(ac); \
	(a) = ROTATE_LEFT ((a), (s)); \
	(a) += (b); \
}
#define GG(a, b, c, d, x, s, ac) { \
	(a) += G ((b), (c), (d)) + (x) + (Uint32)(ac); \
	(a) = ROTATE_LEFT ((a), (s)); \
	(a) += (b); \
}
#define HH(a, b, c, d, x, s, ac) { \
	(a) += H ((b), (c), (d)) + (x) + (Uint32)(ac); \
	(a) = ROTATE_LEFT ((a), (s)); \
	(a) += (b); \
}
#define II(a, b, c, d, x, s, ac) { \
	(a) += I ((b), (c), (d)) + (x) + (Uint32)(ac); \
	(a) = ROTATE_LEFT ((a), (s)); \
	(a) += (b); \
}


BIF_RETTYPE
md5_1(BIF_ALIST_1)
{
    Eterm bin;
    byte* bytes;

    MD5_CTX context;
    MD5Init(&context);
    if (!update(&context, BIF_ARG_1)) {
	BIF_ERROR(BIF_P, BADARG);
    }
    bin = new_binary(BIF_P, (byte *)NULL, 16);
    bytes = binary_bytes(bin);
    MD5Final(bytes, &context);
    BIF_RET(bin);
}

BIF_RETTYPE
md5_init_0(BIF_ALIST_0)
{
    Eterm bin;
    byte* bytes;

    bin = erts_new_heap_binary(BIF_P, (byte *)NULL, sizeof(MD5_CTX), &bytes);
    MD5Init((MD5_CTX *)bytes);
    BIF_RET(bin);
}

BIF_RETTYPE
md5_update_2(BIF_ALIST_2)
{
    byte* old_context;
    byte* new_context;
    Eterm bin;
    byte* temp_alloc = NULL;

    if ((old_context = erts_get_aligned_binary_bytes(BIF_ARG_1, &temp_alloc)) == NULL) {
    error:
	erts_free_aligned_binary_bytes(temp_alloc);
	BIF_ERROR(BIF_P, BADARG);
    }
    if (binary_size(BIF_ARG_1) != sizeof(MD5_CTX)) {
	goto error;
    }
    bin = erts_new_heap_binary(BIF_P, old_context, sizeof(MD5_CTX), &new_context);
    if (!update((MD5_CTX *)new_context, BIF_ARG_2)) {
	goto error;
    }
    erts_free_aligned_binary_bytes(temp_alloc);
    BIF_RET(bin);
}

BIF_RETTYPE
md5_final_1(BIF_ALIST_1)
{
    Eterm bin;
    byte* context;
    byte* result;
    MD5_CTX ctx_copy;
    byte* temp_alloc = NULL;

    if ((context = erts_get_aligned_binary_bytes(BIF_ARG_1, &temp_alloc)) == NULL) {
    error:
	erts_free_aligned_binary_bytes(temp_alloc);
	BIF_ERROR(BIF_P, BADARG);
    }
    if (binary_size(BIF_ARG_1) != sizeof(MD5_CTX)) {
	goto error;
    }
    bin = erts_new_heap_binary(BIF_P, (byte *)NULL, 16, &result);
    memcpy(&ctx_copy, context, sizeof(MD5_CTX));
    erts_free_aligned_binary_bytes(temp_alloc);
    MD5Final(result, &ctx_copy);
    BIF_RET(bin);
}

static int
update(MD5_CTX* context, Eterm iolist)
{
    byte* bytes;
    Uint size = 64*1024;
    int r;

    if (is_binary(iolist)) {
	Uint bitoffs;
	Uint bitsize;

	ERTS_GET_BINARY_BYTES(iolist, bytes, bitoffs, bitsize);
	if (bitsize != 0) {
	    return 0;
	}
	size = binary_size(iolist);
	if (bitoffs == 0) {
	    MD5Update(context, bytes, size);
	    return 1;
	}
    }

    bytes = erts_alloc(ERTS_ALC_T_TMP, size);
    r = io_list_to_buf(iolist, (char*) bytes, size);
    if (r >= 0) {
	size -= r;
    } else if (r == -2) {	/* Type error */
	erts_free(ERTS_ALC_T_TMP, (void *) bytes);
	return 0;
    } else {
	ASSERT(r == -1);	/* Overflow */
	erts_free(ERTS_ALC_T_TMP, (void *) bytes);
	if ((size = io_list_len(iolist)) < 0) { /* Type error */
	    return 0;
	}
	bytes = erts_alloc(ERTS_ALC_T_TMP, size);
	r = io_list_to_buf(iolist, (char*) bytes, size);
	ASSERT(r == 0);
    }
    MD5Update(context, bytes, size);
    erts_free(ERTS_ALC_T_TMP, (void *) bytes);
    return 1;
}

/*
 * MD5 initialization. Begins an MD5 operation, writing a new context.
 */
void MD5Init(MD5_CTX* context)
{
    context->count[0] = context->count[1] = 0;

    /*
     * Load magic initialization constants.
     */
    context->state[0] = 0x67452301;
    context->state[1] = 0xefcdab89;
    context->state[2] = 0x98badcfe;
    context->state[3] = 0x10325476;
}

/*
 * MD5 block update operation. Continues an MD5 message-digest
 * operation, processing another message block, and updating the
 * context.
 */
void MD5Update (context, input, inputLen)
    MD5_CTX *context;                                        /* context */
    unsigned char *input;                                /* input block */
    unsigned int inputLen;                     /* length of input block */
{
    unsigned int i, index, partLen;

    /*
     * Compute number of bytes mod 64
     */
    index = (unsigned int)((context->count[0] >> 3) & 0x3F);

    /* Update number of bits */
    if ((context->count[0] += ((Uint32)inputLen << 3))
	< ((Uint32)inputLen << 3))
	context->count[1]++;
    context->count[1] += ((Uint32)inputLen >> 29);

    partLen = 64 - index;

    /*
     * Transform as many times as possible.
     */
    if (inputLen >= partLen) {
	sys_memcpy
	    ((POINTER)&context->buffer[index], (POINTER)input, partLen);
	MD5Transform (context->state, context->buffer);

	for (i = partLen; i + 63 < inputLen; i += 64)
	    MD5Transform (context->state, &input[i]);

	index = 0;
    }
    else
	i = 0;

    /*
     * Buffer remaining input
     */
    sys_memcpy((POINTER)&context->buffer[index], (POINTER)&input[i], inputLen-i);
}

/*
 * MD5 finalization. Ends an MD5 message-digest operation, writing the
  the message digest and zeroizing the context.
 */
void MD5Final (digest, context)
    unsigned char digest[16];                         /* message digest */
    MD5_CTX *context;                                       /* context */
{
    unsigned char bits[8];
    unsigned int index, padLen;

    /*
     * Save number of bits
     */
    Encode (bits, context->count, 8);

    /*
     * Pad out to 56 mod 64.
     */
    index = (unsigned int)((context->count[0] >> 3) & 0x3f);
    padLen = (index < 56) ? (56 - index) : (120 - index);
    MD5Update (context, PADDING, padLen);

    /*
     * Append length (before padding)
     */
    MD5Update (context, bits, 8);

    /*
     * Store state in digest
     */
    Encode (digest, context->state, 16);

    /*
     * Zeroize sensitive information.
     */
    sys_memset ((POINTER)context, 0, sizeof (*context));
}

/*
 * MD5 basic transformation. Transforms state based on block.
 */
static void MD5Transform (state, block)
    Uint32 state[4];
    unsigned char block[64];
{
    Uint32 a = state[0], b = state[1], c = state[2], d = state[3], x[16];

    Decode (x, block, 64);

    /* Round 1 */
    FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
    FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
    FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
    FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
    FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
    FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
    FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
    FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
    FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
    FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
    FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
    FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
    FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
    FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
    FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
    FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */

    /* Round 2 */
    GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
    GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
    GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
    GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
    GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
    GG (d, a, b, c, x[10], S22,  0x2441453); /* 22 */
    GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
    GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
    GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
    GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
    GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
    GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
    GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
    GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
    GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
    GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */

    /* Round 3 */
    HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
    HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
    HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
    HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
    HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
    HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
    HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
    HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
    HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
    HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
    HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
    HH (b, c, d, a, x[ 6], S34,  0x4881d05); /* 44 */
    HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
    HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
    HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
    HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */

    /* Round 4 */
    II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
    II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
    II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
    II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
    II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
    II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
    II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
    II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
    II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
    II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
    II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
    II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
    II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
    II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
    II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
    II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */

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

    /*
     * Zeroize sensitive information.
     */
    sys_memset ((POINTER)x, 0, sizeof (x));
}

/*
 * Encodes input (Uint32) into output (unsigned char). Assumes len is
 * a multiple of 4.
 */
static void Encode (output, input, len)
    unsigned char *output;
    Uint32 *input;
    unsigned int len;
{
    unsigned int i, j;

    for (i = 0, j = 0; j < len; i++, j += 4) {
	output[j] = (unsigned char)(input[i] & 0xff);
	output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
	output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
	output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
    }
}

/*
 * Decodes input (unsigned char) into output (Uint32). Assumes len is
 * a multiple of 4.
 */
static void Decode (output, input, len)
    Uint32 *output;
    unsigned char *input;
    unsigned int len;
{
    unsigned int i, j;

    for (i = 0, j = 0; j < len; i++, j += 4)
	output[i] = ((Uint32)input[j]) | (((Uint32)input[j+1]) << 8) |
	    (((Uint32)input[j+2]) << 16) | (((Uint32)input[j+3]) << 24);
}