md5.xs

source of perl for linux application,

    } while (--blocks);
    ctx->A = A;
    ctx->B = B;
    ctx->C = C;
    ctx->D = D;
}


#ifdef MD5_DEBUG
static char*
ctx_dump(MD5_CTX* ctx)
{
    static char buf[1024];
    sprintf(buf, "{A=%x,B=%x,C=%x,D=%x,%d,%d(%d)}",
	    ctx->A, ctx->B, ctx->C, ctx->D,
	    ctx->bytes_low, ctx->bytes_high, (ctx->bytes_low&0x3F));
    return buf;
}
#endif


static void
MD5Update(MD5_CTX* ctx, const U8* buf, STRLEN len)
{
    STRLEN blocks;
    STRLEN fill = ctx->bytes_low & 0x3F;

#ifdef MD5_DEBUG  
    static int ucount = 0;
    fprintf(stderr,"%5i: Update(%s, %p, %d)\n", ++ucount, ctx_dump(ctx),
	                                        buf, len);
#endif

    ctx->bytes_low += len;
    if (ctx->bytes_low < len) /* wrap around */
	ctx->bytes_high++;

    if (fill) {
	STRLEN missing = 64 - fill;
	if (len < missing) {
	    Copy(buf, ctx->buffer + fill, len, U8);
	    return;
	}
	Copy(buf, ctx->buffer + fill, missing, U8);
	MD5Transform(ctx, ctx->buffer, 1);
	buf += missing;
	len -= missing;
    }

    blocks = len >> 6;
    if (blocks)
	MD5Transform(ctx, buf, blocks);
    if ( (len &= 0x3F)) {
	Copy(buf + (blocks << 6), ctx->buffer, len, U8);
    }
}


static void
MD5Final(U8* digest, MD5_CTX *ctx)
{
    STRLEN fill = ctx->bytes_low & 0x3F;
    STRLEN padlen = (fill < 56 ? 56 : 120) - fill;
    U32 bits_low, bits_high;
#ifdef MD5_DEBUG
    fprintf(stderr,"       Final:  %s\n", ctx_dump(ctx));
#endif
    Copy(PADDING, ctx->buffer + fill, padlen, U8);
    fill += padlen;

    bits_low = ctx->bytes_low << 3;
    bits_high = (ctx->bytes_high << 3) | (ctx->bytes_low  >> 29);
#ifdef BYTESWAP
    *(U32*)(ctx->buffer + fill) = BYTESWAP(bits_low);    fill += 4;
    *(U32*)(ctx->buffer + fill) = BYTESWAP(bits_high);   fill += 4;
#else
    u2s(bits_low,  ctx->buffer + fill);   fill += 4;
    u2s(bits_high, ctx->buffer + fill);   fill += 4;
#endif

    MD5Transform(ctx, ctx->buffer, fill >> 6);
#ifdef MD5_DEBUG
    fprintf(stderr,"       Result: %s\n", ctx_dump(ctx));
#endif

#ifdef BYTESWAP
    *(U32*)digest = BYTESWAP(ctx->A);  digest += 4;
    *(U32*)digest = BYTESWAP(ctx->B);  digest += 4;
    *(U32*)digest = BYTESWAP(ctx->C);  digest += 4;
    *(U32*)digest = BYTESWAP(ctx->D);
#else
    u2s(ctx->A, digest);
    u2s(ctx->B, digest+4);
    u2s(ctx->C, digest+8);
    u2s(ctx->D, digest+12);
#endif
}

#ifndef INT2PTR
#define INT2PTR(any,d)	(any)(d)
#endif

static MD5_CTX* get_md5_ctx(pTHX_ SV* sv)
{
    if (SvROK(sv)) {
	sv = SvRV(sv);
	if (SvIOK(sv)) {
	    MD5_CTX* ctx = INT2PTR(MD5_CTX*, SvIV(sv));
	    if (ctx && ctx->signature == MD5_CTX_SIGNATURE) {
		return ctx;
            }
        }
    }
    croak("Not a reference to a Digest::MD5 object");
    return (MD5_CTX*)0; /* some compilers insist on a return value */
}


static char* hex_16(const unsigned char* from, char* to)
{
    static const char hexdigits[] = "0123456789abcdef";
    const unsigned char *end = from + 16;
    char *d = to;

    while (from < end) {
	*d++ = hexdigits[(*from >> 4)];
	*d++ = hexdigits[(*from & 0x0F)];
	from++;
    }
    *d = '\0';
    return to;
}

static char* base64_16(const unsigned char* from, char* to)
{
    static const char base64[] =
	"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
    const unsigned char *end = from + 16;
    unsigned char c1, c2, c3;
    char *d = to;

    while (1) {
	c1 = *from++;
	*d++ = base64[c1>>2];
	if (from == end) {
	    *d++ = base64[(c1 & 0x3) << 4];
	    break;
	}
	c2 = *from++;
	c3 = *from++;
	*d++ = base64[((c1 & 0x3) << 4) | ((c2 & 0xF0) >> 4)];
	*d++ = base64[((c2 & 0xF) << 2) | ((c3 & 0xC0) >>6)];
	*d++ = base64[c3 & 0x3F];
    }
    *d = '\0';
    return to;
}

/* Formats */
#define F_BIN 0
#define F_HEX 1
#define F_B64 2

static SV* make_mortal_sv(pTHX_ const unsigned char *src, int type)
{
    STRLEN len;
    char result[33];
    char *ret;
    
    switch (type) {
    case F_BIN:
	ret = (char*)src;
	len = 16;
	break;
    case F_HEX:
	ret = hex_16(src, result);
	len = 32;
	break;
    case F_B64:
	ret = base64_16(src, result);
	len = 22;
	break;
    default:
	croak("Bad convertion type (%d)", type);
	break;
    }
    return sv_2mortal(newSVpv(ret,len));
}


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

typedef PerlIO* InputStream;

MODULE = Digest::MD5		PACKAGE = Digest::MD5

PROTOTYPES: DISABLE

void
new(xclass)
	SV* xclass
    PREINIT:
	MD5_CTX* context;
    PPCODE:
	if (!SvROK(xclass)) {
	    STRLEN my_na;
	    char *sclass = SvPV(xclass, my_na);
	    New(55, context, 1, MD5_CTX);
	    context->signature = MD5_CTX_SIGNATURE;
	    ST(0) = sv_newmortal();
	    sv_setref_pv(ST(0), sclass, (void*)context);
	    SvREADONLY_on(SvRV(ST(0)));
	} else {
	    context = get_md5_ctx(aTHX_ xclass);
	}
        MD5Init(context);
	XSRETURN(1);

void
clone(self)
	SV* self
    PREINIT:
	MD5_CTX* cont = get_md5_ctx(aTHX_ self);
	const char *myname = sv_reftype(SvRV(self),TRUE);
	MD5_CTX* context;
    PPCODE:
	New(55, context, 1, MD5_CTX);
	ST(0) = sv_newmortal();
	sv_setref_pv(ST(0), myname , (void*)context);
	SvREADONLY_on(SvRV(ST(0)));
	memcpy(context,cont,sizeof(MD5_CTX));
	XSRETURN(1);

void
DESTROY(context)
	MD5_CTX* context
    CODE:
        Safefree(context);

void
add(self, ...)
	SV* self
    PREINIT:
	MD5_CTX* context = get_md5_ctx(aTHX_ self);
	int i;
	unsigned char *data;
	STRLEN len;
    PPCODE:
	for (i = 1; i < items; i++) {
	    data = (unsigned char *)(SvPVbyte(ST(i), len));
	    MD5Update(context, data, len);
	}
	XSRETURN(1);  /* self */

void
addfile(self, fh)
	SV* self
	InputStream fh
    PREINIT:
	MD5_CTX* context = get_md5_ctx(aTHX_ self);
	STRLEN fill = context->bytes_low & 0x3F;
#ifdef USE_HEAP_INSTEAD_OF_STACK
	unsigned char* buffer;
#else
	unsigned char buffer[4096];
#endif
	int  n;
    CODE:
	if (fh) {
#ifdef USE_HEAP_INSTEAD_OF_STACK
	    New(0, buffer, 4096, unsigned char);
	    assert(buffer);
#endif
            if (fill) {
	        /* The MD5Update() function is faster if it can work with
	         * complete blocks.  This will fill up any buffered block
	         * first.
	         */
	        STRLEN missing = 64 - fill;
	        if ( (n = PerlIO_read(fh, buffer, missing)) > 0)
	 	    MD5Update(context, buffer, n);
	        else
		    XSRETURN(1);  /* self */
	    }

	    /* Process blocks until EOF or error */
            while ( (n = PerlIO_read(fh, buffer, sizeof(buffer))) > 0) {
	        MD5Update(context, buffer, n);
	    }
#ifdef USE_HEAP_INSTEAD_OF_STACK
	    Safefree(buffer);
#endif
	    if (PerlIO_error(fh)) {
		croak("Reading from filehandle failed");
	    }
	}
	else {
	    croak("No filehandle passed");
	}
	XSRETURN(1);  /* self */

void
digest(context)
	MD5_CTX* context
    ALIAS:
	Digest::MD5::digest    = F_BIN
	Digest::MD5::hexdigest = F_HEX
	Digest::MD5::b64digest = F_B64
    PREINIT:
	unsigned char digeststr[16];
    PPCODE:
        MD5Final(digeststr, context);
	MD5Init(context);  /* In case it is reused */
        ST(0) = make_mortal_sv(aTHX_ digeststr, ix);
        XSRETURN(1);

void
md5(...)
    ALIAS:
	Digest::MD5::md5        = F_BIN
	Digest::MD5::md5_hex    = F_HEX
	Digest::MD5::md5_base64 = F_B64
    PREINIT:
	MD5_CTX ctx;
	int i;
	unsigned char *data;
        STRLEN len;
	unsigned char digeststr[16];
    PPCODE:
	MD5Init(&ctx);

	if (DOWARN) {
            char *msg = 0;
	    if (items == 1) {
		if (SvROK(ST(0))) {
                    SV* sv = SvRV(ST(0));
		    if (SvOBJECT(sv) && strEQ(HvNAME(SvSTASH(sv)), "Digest::MD5"))
		        msg = "probably called as method";
		    else
			msg = "called with reference argument";
		}
	    }
	    else if (items > 1) {
		data = (unsigned char *)SvPVbyte(ST(0), len);
		if (len == 11 && memEQ("Digest::MD5", data, 11)) {
		    msg = "probably called as class method";
		}
	    }
	    if (msg) {
	        const char *f = (ix == F_BIN) ? "md5" :
		                (ix == F_HEX) ? "md5_hex" : "md5_base64";
	        warn("&Digest::MD5::%s function %s", f, msg);
	    }
	}

	for (i = 0; i < items; i++) {
	    data = (unsigned char *)(SvPVbyte(ST(i), len));
	    MD5Update(&ctx, data, len);
	}
	MD5Final(digeststr, &ctx);
        ST(0) = make_mortal_sv(aTHX_ digeststr, ix);
        XSRETURN(1);