imported md5 coding routine from rpm. Compiles.

1999-09-06  bertrand  <Bertrand.Guiheneuf@aful.org>

	* camel/md5-utils.c: imported md5 coding
	routine from rpm. Compiles.

svn path=/trunk/; revision=1182

1 files changed, 338 insertions, 0 deletions

diff --git a/camel/md5-utils.c b/camel/md5-utils.c
new file mode 100644
index 0000000000..01a74ebe1d
--- /dev/null
+++ b/camel/md5-utils.c
@@ -0,0 +1,338 @@
+/*
+ * 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 rpmMD5Init, call rpmMD5Update as
+ * needed on buffers full of bytes, and then call rpmMD5Final, which
+ * will fill a supplied 16-byte array with the digest.
+ */
+
+
+#include "md5-utils.h"
+
+static int _ie = 0x44332211;
+static union _endian { int i; char b[4]; } *_endian = (union _endian *)&_ie;
+#define	IS_BIG_ENDIAN()		(_endian->b[0] == '\x44')
+#define	IS_LITTLE_ENDIAN()	(_endian->b[0] == '\x11')
+
+void byteReverse(unsigned char *buf, unsigned longs);
+
+/*
+ * Note: this code is harmless on little-endian machines.
+ */
+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);
+}
+
+/*
+ * Start MD5 accumulation.  Set bit count to 0 and buffer to mysterious
+ * initialization constants.
+ */
+void rpmMD5Init(struct MD5Context *ctx, int brokenEndian)
+{
+    ctx->buf[0] = 0x67452301;
+    ctx->buf[1] = 0xefcdab89;
+    ctx->buf[2] = 0x98badcfe;
+    ctx->buf[3] = 0x10325476;
+
+    ctx->bits[0] = 0;
+    ctx->bits[1] = 0;
+
+    if (IS_BIG_ENDIAN()) {	/* XXX was ifdef WORDS_BIGENDIAN */
+	if (brokenEndian) {
+	    ctx->doByteReverse = 0;
+	} else {
+	    ctx->doByteReverse = 1;
+	}
+    } else {
+	ctx->doByteReverse = 0;
+    }
+}
+
+/*
+ * Update context to reflect the concatenation of another buffer full
+ * of bytes.
+ */
+void rpmMD5Update(struct MD5Context *ctx, unsigned char const *buf, unsigned len)
+{
+    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);
+	if (ctx->doByteReverse)
+	    byteReverse(ctx->in, 16);
+	rpmMD5Transform(ctx->buf, (uint32 *) ctx->in);
+	buf += t;
+	len -= t;
+    }
+    /* Process data in 64-byte chunks */
+
+    while (len >= 64) {
+	memcpy(ctx->in, buf, 64);
+	if (ctx->doByteReverse)
+	    byteReverse(ctx->in, 16);
+	rpmMD5Transform(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)
+ */
+void rpmMD5Final(unsigned char digest[16], struct MD5Context *ctx)
+{
+    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);
+	if (ctx->doByteReverse)
+	    byteReverse(ctx->in, 16);
+	rpmMD5Transform(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);
+    }
+    if (ctx->doByteReverse)
+	byteReverse(ctx->in, 14);
+
+    /* Append length in bits and transform */
+    ((uint32 *) ctx->in)[14] = ctx->bits[0];
+    ((uint32 *) ctx->in)[15] = ctx->bits[1];
+
+    rpmMD5Transform(ctx->buf, (uint32 *) ctx->in);
+    if (ctx->doByteReverse)
+	byteReverse((unsigned char *) ctx->buf, 4);
+    memcpy(digest, ctx->buf, 16);
+    memset(ctx, 0, sizeof(ctx));	/* In case it's sensitive */
+}
+
+/* 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.  rpmMD5Update blocks
+ * the data and converts bytes into longwords for this routine.
+ */
+void rpmMD5Transform(uint32 buf[4], uint32 const 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;
+}
+
+
+
+
+
+/*
+ * md5sum.c	- Generate/check MD5 Message Digests
+ *
+ * Compile and link with md5.c.  If you don't have getopt() in your library
+ * also include getopt.c.  For MSDOS you can also link with the wildcard
+ * initialization function (wildargs.obj for Turbo C and setargv.obj for MSC)
+ * so that you can use wildcards on the commandline.
+ *
+ * Written March 1993 by Branko Lankester
+ * Modified June 1993 by Colin Plumb for altered md5.c.
+ * Modified October 1995 by Erik Troan for RPM
+ */
+
+#include <stdio.h>
+#include "md5.h"
+
+
+static int domd5(const char * fn, unsigned char * digest, int asAscii,
+		 int brokenEndian) {
+    unsigned char buf[1024];
+    unsigned char bindigest[16];
+    FILE * fp;
+    MD5_CTX ctx;
+    int n;
+
+    fp = fopen(fn, "r");
+    if (!fp) {
+	return 1;
+    }
+
+    rpmMD5Init(&ctx, brokenEndian);
+    while ((n = fread(buf, 1, sizeof(buf), fp)) > 0)
+	    rpmMD5Update(&ctx, buf, n);
+    rpmMD5Final(bindigest, &ctx);
+    if (ferror(fp)) {
+	fclose(fp);
+	return 1;
+    }
+
+    if (!asAscii) {
+	memcpy(digest, bindigest, 16);
+    } else {
+	sprintf(digest, "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x"
+			"%02x%02x%02x%02x%02x",
+		bindigest[0],  bindigest[1],  bindigest[2],  bindigest[3],
+		bindigest[4],  bindigest[5],  bindigest[6],  bindigest[7],
+		bindigest[8],  bindigest[9],  bindigest[10], bindigest[11],
+		bindigest[12], bindigest[13], bindigest[14], bindigest[15]);
+
+    }
+    fclose(fp);
+
+    return 0;
+}
+
+int mdbinfile(const char *fn, unsigned char *bindigest) {
+    return domd5(fn, bindigest, 0, 0);
+}
+
+int mdbinfileBroken(const char *fn, unsigned char *bindigest) {
+    return domd5(fn, bindigest, 0, 1);
+}
+
+int mdfile(const char *fn, unsigned char *digest) {
+    return domd5(fn, digest, 1, 0);
+}
+
+int mdfileBroken(const char *fn, unsigned char *digest) {
+    return domd5(fn, digest, 1, 1);
+}