Stefano Stabellini
2010-Jun-04 14:22 UTC
[Xen-devel] [PATCH] implement md5 in blktap2, remove ssl dependency
Hi all,
I am adding a public domain implementation of md5 to blktap2, so that it
doesn''t need ssl or gcrypt to work anymore.
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
diff -r 4ab68bf4c37e tools/blktap2/drivers/Makefile
--- a/tools/blktap2/drivers/Makefile Thu Jun 03 07:30:54 2010 +0100
+++ b/tools/blktap2/drivers/Makefile Fri Jun 04 15:22:04 2010 +0100
@@ -26,18 +26,6 @@
LIBS += -lrt -lz
-ifeq ($(CONFIG_Linux),y)
-ifeq ($(shell . ./check_gcrypt $(CC)),yes)
-CFLAGS += -DUSE_GCRYPT
-CRYPT_LIB += -lgcrypt
-else
-CRYPT_LIB += -lcrypto
-$(warning === libgcrypt not installed: falling back to libcrypto ===)
-endif
-else
-CRYPT_LIB += -lcrypto
-endif
-
LDFLAGS_img := $(LDFLAGS_libxenctrl) $(CRYPT_LIB) -lpthread -lz -lm
LIBS += -L$(LIBVHDDIR) -lvhd
@@ -97,6 +85,7 @@
BLK-OBJS-y += block-log.o
BLK-OBJS-y += block-qcow.o
BLK-OBJS-y += aes.o
+BLK-OBJS-y += md5.o
BLK-OBJS-y += $(PORTABLE-OBJS-y)
BLK-OBJS-y += $(REMUS-OBJS)
diff -r 4ab68bf4c37e tools/blktap2/drivers/block-qcow.c
--- a/tools/blktap2/drivers/block-qcow.c Thu Jun 03 07:30:54 2010 +0100
+++ b/tools/blktap2/drivers/block-qcow.c Fri Jun 04 15:22:04 2010 +0100
@@ -33,10 +33,10 @@
#include <zlib.h>
#include <inttypes.h>
#include <libaio.h>
-#include <openssl/md5.h>
#include <limits.h>
#include "bswap.h"
#include "aes.h"
+#include "md5.h"
#include "tapdisk.h"
#include "tapdisk-driver.h"
@@ -80,47 +80,17 @@
static int decompress_cluster(struct tdqcow_state *s, uint64_t cluster_offset);
-#ifdef USE_GCRYPT
-
-#include <gcrypt.h>
-
uint32_t gen_cksum(char *ptr, int len)
{
int i;
uint32_t md[4];
/* Generate checksum */
- gcry_md_hash_buffer(GCRY_MD_MD5, md, ptr, len);
+ md5_sum((const uint8_t*)ptr, len, (uint8_t*)md);
return md[0];
}
-#else /* use libcrypto */
-
-#include <openssl/md5.h>
-
-uint32_t gen_cksum(char *ptr, int len)
-{
- int i;
- unsigned char *md;
- uint32_t ret;
-
- md = malloc(MD5_DIGEST_LENGTH);
- if(!md) return 0;
-
- /* Generate checksum */
- if (MD5((unsigned char *)ptr, len, md) != md)
- ret = 0;
- else
- memcpy(&ret, md, sizeof(uint32_t));
-
- free(md);
- return ret;
-}
-
-#endif
-
-
static void free_aio_state(struct tdqcow_state* s)
{
free(s->aio_requests);
diff -r 4ab68bf4c37e tools/blktap2/drivers/img2qcow.c
--- a/tools/blktap2/drivers/img2qcow.c Thu Jun 03 07:30:54 2010 +0100
+++ b/tools/blktap2/drivers/img2qcow.c Fri Jun 04 15:22:04 2010 +0100
@@ -41,7 +41,6 @@
#include <zlib.h>
#include <inttypes.h>
#include <libaio.h>
-#include <openssl/md5.h>
#include "bswap.h"
#include "aes.h"
diff -r 4ab68bf4c37e tools/blktap2/drivers/md5.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/blktap2/drivers/md5.c Fri Jun 04 15:22:04 2010 +0100
@@ -0,0 +1,278 @@
+/* start - public domain MD5 implementation */
+/*
+ * 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 <string.h>
+#include <stdint.h>
+
+struct MD5Context {
+ uint32_t buf[4];
+ uint32_t bits[2];
+ uint8_t in[64];
+};
+
+static void MD5Init(struct MD5Context *context);
+static void MD5Update(struct MD5Context *context, unsigned char const *buf,
+ unsigned len);
+static void MD5Final(unsigned char digest[16], struct MD5Context *context);
+static void MD5Transform(uint32_t buf[4], uint32_t const in[16]);
+
+
+typedef struct MD5Context MD5_CTX;
+
+
+/**
+ * md5_sum - MD5 hash for a data block
+ * @addr: Pointers to the data area
+ * @len: Lengths of the data block
+ * @mac: Buffer for the hash
+ */
+void md5_sum(const uint8_t *addr, const size_t len, uint8_t *mac)
+{
+ MD5_CTX ctx;
+
+ MD5Init(&ctx);
+ MD5Update(&ctx, addr, len);
+ MD5Final(mac, &ctx);
+}
+
+
+#ifndef WORDS_BIGENDIAN
+#define byteReverse(buf, len) /* Nothing */
+#else
+/*
+ * Note: this code is harmless on little-endian machines.
+ */
+static void byteReverse(unsigned char *buf, unsigned longs)
+{
+ uint32_t t;
+ do {
+ t = (uint32_t) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
+ ((unsigned) buf[1] << 8 | buf[0]);
+ *(uint32_t *) buf = t;
+ buf += 4;
+ } while (--longs);
+}
+#endif
+
+/*
+ * Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
+ * initialization constants.
+ */
+void MD5Init(struct MD5Context *ctx)
+{
+ 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.
+ */
+void MD5Update(struct MD5Context *ctx, unsigned char const *buf, unsigned len)
+{
+ uint32_t t;
+
+ /* Update bitcount */
+
+ t = ctx->bits[0];
+ if ((ctx->bits[0] = t + ((uint32_t) 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_t *) 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_t *) 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 MD5Final(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);
+ byteReverse(ctx->in, 16);
+ MD5Transform(ctx->buf, (uint32_t *) 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_t *) ctx->in)[14] = ctx->bits[0];
+ ((uint32_t *) ctx->in)[15] = ctx->bits[1];
+
+ MD5Transform(ctx->buf, (uint32_t *) ctx->in);
+ 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. MD5Update blocks
+ * the data and converts bytes into longwords for this routine.
+ */
+static void MD5Transform(uint32_t buf[4], uint32_t const in[16])
+{
+ register 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;
+}
diff -r 4ab68bf4c37e tools/blktap2/drivers/md5.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/blktap2/drivers/md5.h Fri Jun 04 15:22:04 2010 +0100
@@ -0,0 +1,15 @@
+#ifndef MD5_H
+#define MD5_H
+
+#include <stdint.h>
+#include <stddef.h>
+
+/**
+ * md5_sum - MD5 hash for a data block
+ * @addr: Pointers to the data area
+ * @len: Lengths of the data block
+ * @mac: Buffer for the hash
+ */
+void md5_sum(const uint8_t *addr, const size_t len, uint8_t *mac);
+
+#endif
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Dulloor
2010-Jun-04 18:32 UTC
Re: [Xen-devel] [PATCH] implement md5 in blktap2, remove ssl dependency
IMO it is not a good idea to replicate library functions. Dependency on libraries isn''t necessarily a bad thing. These functions are in libraries for a reason and that is reuse. If there are differences across the distros, it should be solved with the check scripts (as it is done everywhere). This might be a trivial example to pick (just an md5 function), but still. -dulloor On Fri, Jun 4, 2010 at 7:22 AM, Stefano Stabellini <stefano.stabellini@eu.citrix.com> wrote:> Hi all, > I am adding a public domain implementation of md5 to blktap2, so that it > doesn''t need ssl or gcrypt to work anymore. > > > Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> > > --- > > diff -r 4ab68bf4c37e tools/blktap2/drivers/Makefile > --- a/tools/blktap2/drivers/Makefile Thu Jun 03 07:30:54 2010 +0100 > +++ b/tools/blktap2/drivers/Makefile Fri Jun 04 15:22:04 2010 +0100 > @@ -26,18 +26,6 @@ > > LIBS += -lrt -lz > > -ifeq ($(CONFIG_Linux),y) > -ifeq ($(shell . ./check_gcrypt $(CC)),yes) > -CFLAGS += -DUSE_GCRYPT > -CRYPT_LIB += -lgcrypt > -else > -CRYPT_LIB += -lcrypto > -$(warning === libgcrypt not installed: falling back to libcrypto ===) > -endif > -else > -CRYPT_LIB += -lcrypto > -endif > - > LDFLAGS_img := $(LDFLAGS_libxenctrl) $(CRYPT_LIB) -lpthread -lz -lm > > LIBS += -L$(LIBVHDDIR) -lvhd > @@ -97,6 +85,7 @@ > BLK-OBJS-y += block-log.o > BLK-OBJS-y += block-qcow.o > BLK-OBJS-y += aes.o > +BLK-OBJS-y += md5.o > BLK-OBJS-y += $(PORTABLE-OBJS-y) > BLK-OBJS-y += $(REMUS-OBJS) > > diff -r 4ab68bf4c37e tools/blktap2/drivers/block-qcow.c > --- a/tools/blktap2/drivers/block-qcow.c Thu Jun 03 07:30:54 2010 +0100 > +++ b/tools/blktap2/drivers/block-qcow.c Fri Jun 04 15:22:04 2010 +0100 > @@ -33,10 +33,10 @@ > #include <zlib.h> > #include <inttypes.h> > #include <libaio.h> > -#include <openssl/md5.h> > #include <limits.h> > #include "bswap.h" > #include "aes.h" > +#include "md5.h" > > #include "tapdisk.h" > #include "tapdisk-driver.h" > @@ -80,47 +80,17 @@ > > static int decompress_cluster(struct tdqcow_state *s, uint64_t cluster_offset); > > -#ifdef USE_GCRYPT > - > -#include <gcrypt.h> > - > uint32_t gen_cksum(char *ptr, int len) > { > int i; > uint32_t md[4]; > > /* Generate checksum */ > - gcry_md_hash_buffer(GCRY_MD_MD5, md, ptr, len); > + md5_sum((const uint8_t*)ptr, len, (uint8_t*)md); > > return md[0]; > } > > -#else /* use libcrypto */ > - > -#include <openssl/md5.h> > - > -uint32_t gen_cksum(char *ptr, int len) > -{ > - int i; > - unsigned char *md; > - uint32_t ret; > - > - md = malloc(MD5_DIGEST_LENGTH); > - if(!md) return 0; > - > - /* Generate checksum */ > - if (MD5((unsigned char *)ptr, len, md) != md) > - ret = 0; > - else > - memcpy(&ret, md, sizeof(uint32_t)); > - > - free(md); > - return ret; > -} > - > -#endif > - > - > static void free_aio_state(struct tdqcow_state* s) > { > free(s->aio_requests); > diff -r 4ab68bf4c37e tools/blktap2/drivers/img2qcow.c > --- a/tools/blktap2/drivers/img2qcow.c Thu Jun 03 07:30:54 2010 +0100 > +++ b/tools/blktap2/drivers/img2qcow.c Fri Jun 04 15:22:04 2010 +0100 > @@ -41,7 +41,6 @@ > #include <zlib.h> > #include <inttypes.h> > #include <libaio.h> > -#include <openssl/md5.h> > > #include "bswap.h" > #include "aes.h" > diff -r 4ab68bf4c37e tools/blktap2/drivers/md5.c > --- /dev/null Thu Jan 01 00:00:00 1970 +0000 > +++ b/tools/blktap2/drivers/md5.c Fri Jun 04 15:22:04 2010 +0100 > @@ -0,0 +1,278 @@ > +/* start - public domain MD5 implementation */ > +/* > + * 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 <string.h> > +#include <stdint.h> > + > +struct MD5Context { > + uint32_t buf[4]; > + uint32_t bits[2]; > + uint8_t in[64]; > +}; > + > +static void MD5Init(struct MD5Context *context); > +static void MD5Update(struct MD5Context *context, unsigned char const *buf, > + unsigned len); > +static void MD5Final(unsigned char digest[16], struct MD5Context *context); > +static void MD5Transform(uint32_t buf[4], uint32_t const in[16]); > + > + > +typedef struct MD5Context MD5_CTX; > + > + > +/** > + * md5_sum - MD5 hash for a data block > + * @addr: Pointers to the data area > + * @len: Lengths of the data block > + * @mac: Buffer for the hash > + */ > +void md5_sum(const uint8_t *addr, const size_t len, uint8_t *mac) > +{ > + MD5_CTX ctx; > + > + MD5Init(&ctx); > + MD5Update(&ctx, addr, len); > + MD5Final(mac, &ctx); > +} > + > + > +#ifndef WORDS_BIGENDIAN > +#define byteReverse(buf, len) /* Nothing */ > +#else > +/* > + * Note: this code is harmless on little-endian machines. > + */ > +static void byteReverse(unsigned char *buf, unsigned longs) > +{ > + uint32_t t; > + do { > + t = (uint32_t) ((unsigned) buf[3] << 8 | buf[2]) << 16 | > + ((unsigned) buf[1] << 8 | buf[0]); > + *(uint32_t *) buf = t; > + buf += 4; > + } while (--longs); > +} > +#endif > + > +/* > + * Start MD5 accumulation. Set bit count to 0 and buffer to mysterious > + * initialization constants. > + */ > +void MD5Init(struct MD5Context *ctx) > +{ > + 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. > + */ > +void MD5Update(struct MD5Context *ctx, unsigned char const *buf, unsigned len) > +{ > + uint32_t t; > + > + /* Update bitcount */ > + > + t = ctx->bits[0]; > + if ((ctx->bits[0] = t + ((uint32_t) 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_t *) 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_t *) 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 MD5Final(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); > + byteReverse(ctx->in, 16); > + MD5Transform(ctx->buf, (uint32_t *) 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_t *) ctx->in)[14] = ctx->bits[0]; > + ((uint32_t *) ctx->in)[15] = ctx->bits[1]; > + > + MD5Transform(ctx->buf, (uint32_t *) ctx->in); > + 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. MD5Update blocks > + * the data and converts bytes into longwords for this routine. > + */ > +static void MD5Transform(uint32_t buf[4], uint32_t const in[16]) > +{ > + register 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; > +} > diff -r 4ab68bf4c37e tools/blktap2/drivers/md5.h > --- /dev/null Thu Jan 01 00:00:00 1970 +0000 > +++ b/tools/blktap2/drivers/md5.h Fri Jun 04 15:22:04 2010 +0100 > @@ -0,0 +1,15 @@ > +#ifndef MD5_H > +#define MD5_H > + > +#include <stdint.h> > +#include <stddef.h> > + > +/** > + * md5_sum - MD5 hash for a data block > + * @addr: Pointers to the data area > + * @len: Lengths of the data block > + * @mac: Buffer for the hash > + */ > +void md5_sum(const uint8_t *addr, const size_t len, uint8_t *mac); > + > +#endif > > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xensource.com > http://lists.xensource.com/xen-devel >_______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
Keir Fraser
2010-Jun-07 06:00 UTC
Re: [Xen-devel] [PATCH] implement md5 in blktap2, remove ssl dependency
On 04/06/2010 15:22, "Stefano Stabellini" <Stefano.Stabellini@eu.citrix.com> wrote:> Hi all, > I am adding a public domain implementation of md5 to blktap2, so that it > doesn''t need ssl or gcrypt to work anymore.Why is that better than requiring installation of one of gcrypt or crypto libs? -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
Stefano Stabellini
2010-Jun-07 10:21 UTC
Re: [Xen-devel] [PATCH] implement md5 in blktap2, remove ssl dependency
On Mon, 7 Jun 2010, Keir Fraser wrote:> On 04/06/2010 15:22, "Stefano Stabellini" <Stefano.Stabellini@eu.citrix.com> > wrote: > > > Hi all, > > I am adding a public domain implementation of md5 to blktap2, so that it > > doesn''t need ssl or gcrypt to work anymore. > > Why is that better than requiring installation of one of gcrypt or crypto > libs? >Because we are requiring installation (and redistribution in case of products based on Xen) of a crypto library just for a simple MD5 checksum function. Redistributing a crypto library is not easy: openssl is difficult to redistribute due to the BSD advert clause, while gcrypto on the other hand is difficult to redistribute outside of the United States as part of a product because it requires explicit authorization for the exact libgcrypto binary you are using. I know that Debian and other distros have already sorted out all that, but I still think that introducing all this pain just for an MD5 function is unreasonable. _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel