Mailing List Archive

# HG changeset patch
# User Keir Fraser <keir.fraser@citrix.com>
# Date 1275922048 -3600
# Node ID ca2738f258f898d7b8b013619305b34105ecaddc
# Parent b704a2e22fd672136817e3ad8b0e5aa6f146bc93
bltap2: implement md5 directly, to remove ssl dependency

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
tools/blktap2/drivers/Makefile | 13 -
tools/blktap2/drivers/block-qcow.c | 34 ----
tools/blktap2/drivers/img2qcow.c | 1
tools/blktap2/drivers/md5.c | 278 +++++++++++++++++++++++++++++++++++++
tools/blktap2/drivers/md5.h | 15 +
5 files changed, 296 insertions(+), 45 deletions(-)

diff -r b704a2e22fd6 -r ca2738f258f8 tools/blktap2/drivers/Makefile
--- a/tools/blktap2/drivers/Makefile Mon Jun 07 15:46:48 2010 +0100
+++ b/tools/blktap2/drivers/Makefile Mon Jun 07 15:47:28 2010 +0100
@@ -25,18 +25,6 @@ endif
endif

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

@@ -97,6 +85,7 @@ BLK-OBJS-y += block-log.o
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 b704a2e22fd6 -r ca2738f258f8 tools/blktap2/drivers/block-qcow.c
--- a/tools/blktap2/drivers/block-qcow.c Mon Jun 07 15:46:48 2010 +0100
+++ b/tools/blktap2/drivers/block-qcow.c Mon Jun 07 15:47:28 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"
@@ -80,46 +80,16 @@ struct qcow_request {

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)
{
diff -r b704a2e22fd6 -r ca2738f258f8 tools/blktap2/drivers/img2qcow.c
--- a/tools/blktap2/drivers/img2qcow.c Mon Jun 07 15:46:48 2010 +0100
+++ b/tools/blktap2/drivers/img2qcow.c Mon Jun 07 15:47:28 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 b704a2e22fd6 -r ca2738f258f8 tools/blktap2/drivers/md5.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/blktap2/drivers/md5.c Mon Jun 07 15:47:28 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 b704a2e22fd6 -r ca2738f258f8 tools/blktap2/drivers/md5.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/blktap2/drivers/md5.h Mon Jun 07 15:47:28 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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