jsiMD5.c

#ifndef JSI_LITE_ONLY
/* Origin: SQLITE.
 * 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.
 */
#ifndef JSI_AMALGAMATION
#include "jsiInt.h"
#endif
#include <string.h>
/*
 * If compiled on a machine that doesn't have a 32-bit integer,
 * you just set "uint32" to the appropriate datatype for an
 * unsigned 32-bit integer.  For example:
 *
 *       cc -Duint32='unsigned long' md5.c
 *
 */
#ifndef uint32
#  define uint32 unsigned int
#endif

struct Context {
    uint32 buf[4];
    uint32 bits[2];
    unsigned char in[64];
};
typedef char MD5Context[88];

/*
 * Note: this code is harmless on little-endian machines.
 */
static void byteReverse (unsigned char *buf, unsigned longs) {
    uint32 t;
    do {
        t = (uint32)((unsigned)buf[3]<<8 | buf[2]) << 16 |
            ((unsigned)buf[1]<<8 | buf[0]);
        *(uint32 *)buf = t;
        buf += 4;
    } while (--longs);
}
/* 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, data, s) \
        ( w += f(x, y, z) + data,  w = w<<s | w>>(32-s),  w += 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 MD5Transform(uint32 buf[4], const uint32 in[16]) {
    register uint32 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;
}

/*
 * Start MD5 accumulation.  Set bit count to 0 and buffer to mysterious
 * initialization constants.
 */
static void MD5Init(MD5Context *pCtx) {
    struct Context *ctx = (struct Context *)pCtx;
    ctx->buf[0] = 0x67452301;
    ctx->buf[1] = 0xefcdab89;
    ctx->buf[2] = 0x98badcfe;
    ctx->buf[3] = 0x10325476;
    ctx->bits[0] = 0;
    ctx->bits[1] = 0;
}

/*
 * Update context to reflect the concatenation of another buffer full
 * of bytes.
 */
static
void MD5Update(MD5Context *pCtx, const unsigned char *buf, unsigned int len) {
    struct Context *ctx = (struct Context *)pCtx;
    uint32 t;

    /* Update bitcount */

    t = ctx->bits[0];
    if ((ctx->bits[0] = t + ((uint32)len << 3)) < t)
        ctx->bits[1]++; /* Carry from low to high */
    ctx->bits[1] += len >> 29;

    t = (t >> 3) & 0x3f;    /* Bytes already in shsInfo->data */

    /* Handle any leading odd-sized chunks */

    if ( t ) {
        unsigned char *p = (unsigned char *)ctx->in + t;

        t = 64-t;
        if (len < t) {
            memcpy(p, buf, len);
            return;
        }
        memcpy(p, buf, t);
        byteReverse(ctx->in, 16);
        MD5Transform(ctx->buf, (uint32 *)ctx->in);
        buf += t;
        len -= t;
    }

    /* Process data in 64-byte chunks */

    while (len >= 64) {
        memcpy(ctx->in, buf, 64);
        byteReverse(ctx->in, 16);
        MD5Transform(ctx->buf, (uint32 *)ctx->in);
        buf += 64;
        len -= 64;
    }

    /* Handle any remaining bytes of data. */

    memcpy(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)
 */
static void MD5Final(unsigned char digest[16], MD5Context *pCtx) {
    struct Context *ctx = (struct Context *)pCtx;
    unsigned count;
    unsigned char *p;

    /* Compute number of bytes mod 64 */
    count = (ctx->bits[0] >> 3) & 0x3F;

    /* Set the first char of padding to 0x80.  This is safe since there is
       always at least one byte free */
    p = ctx->in + count;
    *p++ = 0x80;

    /* Bytes of padding needed to make 64 bytes */
    count = 64 - 1 - count;

    /* Pad out to 56 mod 64 */
    if (count < 8) {
        /* Two lots of padding:  Pad the first block to 64 bytes */
        memset(p, 0, count);
        byteReverse(ctx->in, 16);
        MD5Transform(ctx->buf, (uint32 *)ctx->in);

        /* Now fill the next block with 56 bytes */
        memset(ctx->in, 0, 56);
    } else {
        /* Pad block to 56 bytes */
        memset(p, 0, count-8);
    }
    byteReverse(ctx->in, 14);

    /* Append length in bits and transform */
    ((uint32 *)ctx->in)[ 14 ] = ctx->bits[0];
    ((uint32 *)ctx->in)[ 15 ] = ctx->bits[1];

    MD5Transform(ctx->buf, (uint32 *)ctx->in);
    byteReverse((unsigned char *)ctx->buf, 4);
    memcpy(digest, ctx->buf, 16);
    memset(ctx, 0, sizeof(ctx));    /* In case it's sensitive */
}

/*
** Convert a digest into base-16.  digest should be declared as
** "unsigned char digest[16]" in the calling function.  The MD5
** digest is stored in the first 16 bytes.  zBuf should
** be "char zBuf[33]".
*/
static void DigestToBase16(unsigned char *digest, char *zBuf, int len) {
    static char const zEncode[] = "0123456789abcdef";
    int i, j;

    for(j=i=0; i<len; i++) {
        int a = digest[i];
        zBuf[j++] = zEncode[(a>>4)&0xf];
        zBuf[j++] = zEncode[a & 0xf];
    }
    zBuf[j] = 0;
}

/*
** A JS command for md5.  The argument is the text to be hashed.  The
** Result is the hash in base64.
*/
int jsi_Md5Str(Jsi_Interp *interp, Jsi_Value **ret, const char *str, int len)
{
    MD5Context ctx;
    unsigned char digest[16];
    char buf[100];
    MD5Init(&ctx);
    if (len<0)
        len = strlen(str);
    MD5Update(&ctx, (unsigned char*)str, len);
    MD5Final(digest, &ctx);
    DigestToBase16(digest, buf, 16);
    Jsi_ValueMakeString(interp, *ret, Jsi_Strdup(buf));
    return JSI_OK;
}

int jsi_Md5File(Jsi_Interp *interp, Jsi_Value *args, Jsi_Value *_this,
                 Jsi_Value **ret, Jsi_Func *funcPtr)
{
    MD5Context ctx;
    unsigned char digest[16];
    char zBuf[1000];
    Jsi_Value *arg = Jsi_ValueArrayIndex(interp, args, 0);

    Jsi_Channel in = Jsi_Open(interp, arg, "rb");
    if( in==0 ) {
        char *fn = Jsi_ValueString(interp, arg, 0);
        Jsi_LogError("unable to open file \"%s\"", fn ? fn : "");
        return JSI_ERROR;
    }
    MD5Init(&ctx);
    for(;;) {
        int n;
        n = Jsi_Read(in, zBuf, sizeof(zBuf));
        if( n<=0 ) break;
        MD5Update(&ctx, (unsigned char*)zBuf, (unsigned)n);
    }
    Jsi_Close(in);
    MD5Final(digest, &ctx);
    DigestToBase16(digest, zBuf, 16);
    Jsi_ValueMakeStringDup(interp, *ret, zBuf);
    return JSI_OK;
}

#ifndef HAVE_WEBSOCKET
#define WITHOUT_SHA1
#endif

int jsi_Sha1Str(Jsi_Interp *interp, Jsi_Value **ret, const char *str, int len)
{
#ifdef WITHOUT_SHA1
    Jsi_LogWarn("SHA1 support requires websockets");
#else
    char buf2[100] = "", *cp = (char*)str;
    unsigned char buf[40];

    if (len<0)
        len = strlen(cp);
    extern char* SHA1(const unsigned char *d, size_t n, unsigned char *md);
    SHA1((unsigned char*)cp, len, buf);
    DigestToBase16(buf, buf2, 20);
    Jsi_ValueMakeStringDup(interp, *ret, buf2);
#endif
    return JSI_OK;
}

int jsi_Sha1File(Jsi_Interp *interp, Jsi_Value *args, Jsi_Value *_this,
                 Jsi_Value **ret, Jsi_Func *funcPtr)
{
#ifdef WITHOUT_SHA1
    Jsi_LogWarn("SHA1 support requires websockets");
#else
    char buf2[100] = "";
    unsigned char buf[40];
    Jsi_Value *arg = Jsi_ValueArrayIndex(interp, args, 0);
    Jsi_Channel in = Jsi_Open(interp, arg, "rb");
    
    if( in==0 ) {
        char *fn = Jsi_ValueString(interp, arg, 0);
        Jsi_LogError("unable to open file \"%s\"", fn ? fn : "");
        return JSI_ERROR;
    }
    Jsi_DString dStr = {};
    char zBuf[1000];
    for(;;) {
        int n;
        n = Jsi_Read(in, zBuf, sizeof(zBuf));
        if( n<=0 ) break;
        Jsi_DSAppendLen(&dStr, zBuf, n);;
    }
    {
        extern char* SHA1(const unsigned char *d, size_t n, unsigned char *md);
        char *cp = Jsi_DSValue(&dStr);
        SHA1((unsigned char*)cp, strlen(cp), buf);
        DigestToBase16(buf, buf2, 20);
    }
    Jsi_Close(in);
    Jsi_ValueMakeStringDup(interp, *ret, buf2);
#endif
    return JSI_OK;
}
#endif