From: Theodore Ts'o <tytso@mit.edu>
Date: Tue, 24 Feb 2015 03:38:46 +0000 (-0500)
Subject: libext2fs: add functions for sha256 and sha512
X-Git-Tag: v1.43-WIP-2015-05-18~70
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=569ee9020d15f5cf5237d1110f314c81d2417897;p=thirdparty%2Fe2fsprogs.git

libext2fs: add functions for sha256 and sha512

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
---

diff --git a/lib/ext2fs/Makefile.in b/lib/ext2fs/Makefile.in
index 2706bfa53..30a393c26 100644
--- a/lib/ext2fs/Makefile.in
+++ b/lib/ext2fs/Makefile.in
@@ -115,6 +115,8 @@ OBJS= $(DEBUGFS_LIB_OBJS) $(RESIZE_LIB_OBJS) $(E2IMAGE_LIB_OBJS) \
 	read_bb_file.o \
 	res_gdt.o \
 	rw_bitmaps.o \
+	sha256.o \
+	sha512.o \
 	swapfs.o \
 	symlink.o \
 	tdb.o \
@@ -192,6 +194,8 @@ SRCS= ext2_err.c \
 	$(srcdir)/read_bb_file.c \
 	$(srcdir)/res_gdt.c \
 	$(srcdir)/rw_bitmaps.c \
+	$(srcdir)/sha256.c \
+	$(srcdir)/sha512.c \
 	$(srcdir)/swapfs.c \
 	$(srcdir)/symlink.c \
 	$(srcdir)/tdb.c \
@@ -329,6 +333,16 @@ tst_inode_size: tst_inode_size.o
 	$(E) "	LD $@"
 	$(Q) $(CC) -o tst_inode_size tst_inode_size.o $(ALL_LDFLAGS) $(SYSLIBS)
 
+tst_sha256: $(srcdir)/sha256.c $(srcdir)/ext2_fs.h
+	$(E) "	CC $@"
+	$(Q) $(CC) $(ALL_LDFLAGS) $(ALL_CFLAGS) -o tst_sha256 \
+		$(srcdir)/sha256.c -DUNITTEST $(SYSLIBS)
+
+tst_sha512: $(srcdir)/sha512.c $(srcdir)/ext2_fs.h
+	$(E) "	CC $@"
+	$(Q) $(CC) $(ALL_LDFLAGS) $(ALL_CFLAGS) -o tst_sha512 \
+		$(srcdir)/sha512.c -DUNITTEST $(SYSLIBS)
+
 ext2_tdbtool: tdbtool.o
 	$(E) "	LD $@"
 	$(Q) $(CC) -o ext2_tdbtool tdbtool.o tdb.o $(ALL_LDFLAGS) $(SYSLIBS)
@@ -502,7 +516,7 @@ mkjournal: mkjournal.c $(STATIC_LIBEXT2FS) $(DEPLIBCOM_ERR)
 
 check:: tst_bitops tst_badblocks tst_iscan tst_types tst_icount \
     tst_super_size tst_types tst_inode_size tst_csum tst_crc32c tst_bitmaps \
-    tst_inline tst_inline_data tst_libext2fs
+    tst_inline tst_inline_data tst_libext2fs tst_sha256 tst_sha512
 	$(TESTENV) ./tst_bitops
 	$(TESTENV) ./tst_badblocks
 	$(TESTENV) ./tst_iscan
@@ -514,6 +528,8 @@ check:: tst_bitops tst_badblocks tst_iscan tst_types tst_icount \
 	$(TESTENV) ./tst_inline
 	$(TESTENV) ./tst_inline_data
 	$(TESTENV) ./tst_crc32c
+	$(TESTENV) ./tst_sha256
+	$(TESTENV) ./tst_sha512
 	$(TESTENV) ./tst_bitmaps -f $(srcdir)/tst_bitmaps_cmds > tst_bitmaps_out
 	diff $(srcdir)/tst_bitmaps_exp tst_bitmaps_out
 	$(TESTENV) ./tst_bitmaps -t 2 -f $(srcdir)/tst_bitmaps_cmds > tst_bitmaps_out
@@ -996,6 +1012,18 @@ rw_bitmaps.o: $(srcdir)/rw_bitmaps.c $(top_builddir)/lib/config.h \
  $(srcdir)/ext2_fs.h $(srcdir)/ext3_extents.h $(top_srcdir)/lib/et/com_err.h \
  $(srcdir)/ext2_io.h $(top_builddir)/lib/ext2fs/ext2_err.h \
  $(srcdir)/ext2_ext_attr.h $(srcdir)/bitops.h $(srcdir)/e2image.h
+sha256.o: $(srcdir)/sha256.c $(top_builddir)/lib/config.h \
+ $(top_builddir)/lib/dirpaths.h $(srcdir)/ext2fs.h \
+ $(top_builddir)/lib/ext2fs/ext2_types.h $(srcdir)/ext2_fs.h \
+ $(srcdir)/ext3_extents.h $(top_srcdir)/lib/et/com_err.h $(srcdir)/ext2_io.h \
+ $(top_builddir)/lib/ext2fs/ext2_err.h $(srcdir)/ext2_ext_attr.h \
+ $(srcdir)/bitops.h
+sha512.o: $(srcdir)/sha512.c $(top_builddir)/lib/config.h \
+ $(top_builddir)/lib/dirpaths.h $(srcdir)/ext2fs.h \
+ $(top_builddir)/lib/ext2fs/ext2_types.h $(srcdir)/ext2_fs.h \
+ $(srcdir)/ext3_extents.h $(top_srcdir)/lib/et/com_err.h $(srcdir)/ext2_io.h \
+ $(top_builddir)/lib/ext2fs/ext2_err.h $(srcdir)/ext2_ext_attr.h \
+ $(srcdir)/bitops.h
 swapfs.o: $(srcdir)/swapfs.c $(top_builddir)/lib/config.h \
  $(top_builddir)/lib/dirpaths.h $(srcdir)/ext2_fs.h \
  $(top_builddir)/lib/ext2fs/ext2_types.h $(srcdir)/ext2fs.h \
diff --git a/lib/ext2fs/ext2fs.h b/lib/ext2fs/ext2fs.h
index 93d994063..4dca4b782 100644
--- a/lib/ext2fs/ext2fs.h
+++ b/lib/ext2fs/ext2fs.h
@@ -1573,6 +1573,14 @@ extern errcode_t ext2fs_read_bb_FILE(ext2_filsys fs, FILE *f,
 /* res_gdt.c */
 extern errcode_t ext2fs_create_resize_inode(ext2_filsys fs);
 
+/* sha512.c */
+#define EXT2FS_SHA512_LENGTH 64
+extern void ext2fs_sha512(unsigned char *in, unsigned long in_size,
+			  unsigned char out[EXT2FS_SHA512_LENGTH]);
+#define EXT2FS_SHA256_LENGTH 32
+void ext2fs_sha256(unsigned char *in, unsigned long in_size,
+		   unsigned char out[EXT2FS_SHA256_LENGTH]);
+
 /* swapfs.c */
 extern errcode_t ext2fs_dirent_swab_in2(ext2_filsys fs, char *buf, size_t size,
 					int flags);
diff --git a/lib/ext2fs/sha256.c b/lib/ext2fs/sha256.c
new file mode 100644
index 000000000..8f3e1f612
--- /dev/null
+++ b/lib/ext2fs/sha256.c
@@ -0,0 +1,255 @@
+/*
+ * sha256.c --- The sh256 algorithm
+ *
+ * Copyright (C) 2004 Sam Hocevar <sam@hocevar.net>
+ * (copied from libtomcrypt and then relicensed under GPLv2)
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the GNU Library
+ * General Public License, version 2.
+ * %End-Header%
+ */
+
+
+#include "config.h"
+#if HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+#include "ext2fs.h"
+
+static const __u32 K[64] = {
+    0x428a2f98UL, 0x71374491UL, 0xb5c0fbcfUL, 0xe9b5dba5UL, 0x3956c25bUL,
+    0x59f111f1UL, 0x923f82a4UL, 0xab1c5ed5UL, 0xd807aa98UL, 0x12835b01UL,
+    0x243185beUL, 0x550c7dc3UL, 0x72be5d74UL, 0x80deb1feUL, 0x9bdc06a7UL,
+    0xc19bf174UL, 0xe49b69c1UL, 0xefbe4786UL, 0x0fc19dc6UL, 0x240ca1ccUL,
+    0x2de92c6fUL, 0x4a7484aaUL, 0x5cb0a9dcUL, 0x76f988daUL, 0x983e5152UL,
+    0xa831c66dUL, 0xb00327c8UL, 0xbf597fc7UL, 0xc6e00bf3UL, 0xd5a79147UL,
+    0x06ca6351UL, 0x14292967UL, 0x27b70a85UL, 0x2e1b2138UL, 0x4d2c6dfcUL,
+    0x53380d13UL, 0x650a7354UL, 0x766a0abbUL, 0x81c2c92eUL, 0x92722c85UL,
+    0xa2bfe8a1UL, 0xa81a664bUL, 0xc24b8b70UL, 0xc76c51a3UL, 0xd192e819UL,
+    0xd6990624UL, 0xf40e3585UL, 0x106aa070UL, 0x19a4c116UL, 0x1e376c08UL,
+    0x2748774cUL, 0x34b0bcb5UL, 0x391c0cb3UL, 0x4ed8aa4aUL, 0x5b9cca4fUL,
+    0x682e6ff3UL, 0x748f82eeUL, 0x78a5636fUL, 0x84c87814UL, 0x8cc70208UL,
+    0x90befffaUL, 0xa4506cebUL, 0xbef9a3f7UL, 0xc67178f2UL
+};
+
+/* Various logical functions */
+#define Ch(x,y,z)       (z ^ (x & (y ^ z)))
+#define Maj(x,y,z)      (((x | y) & z) | (x & y)) 
+#define S(x, n)         RORc((x),(n))
+#define R(x, n)         (((x)&0xFFFFFFFFUL)>>(n))
+#define Sigma0(x)       (S(x, 2) ^ S(x, 13) ^ S(x, 22))
+#define Sigma1(x)       (S(x, 6) ^ S(x, 11) ^ S(x, 25))
+#define Gamma0(x)       (S(x, 7) ^ S(x, 18) ^ R(x, 3))
+#define Gamma1(x)       (S(x, 17) ^ S(x, 19) ^ R(x, 10))
+#define RORc(x, y) ( ((((__u32)(x)&0xFFFFFFFFUL)>>(__u32)((y)&31)) | ((__u32)(x)<<(__u32)(32-((y)&31)))) & 0xFFFFFFFFUL)
+
+#define RND(a,b,c,d,e,f,g,h,i)                         \
+     t0 = h + Sigma1(e) + Ch(e, f, g) + K[i] + W[i];   \
+     t1 = Sigma0(a) + Maj(a, b, c);                    \
+     d += t0;                                          \
+     h  = t0 + t1;
+
+#define STORE64H(x, y) \
+	do { \
+		(y)[0] = (unsigned char)(((x)>>56)&255);\
+		(y)[1] = (unsigned char)(((x)>>48)&255);\
+		(y)[2] = (unsigned char)(((x)>>40)&255);\
+		(y)[3] = (unsigned char)(((x)>>32)&255);\
+		(y)[4] = (unsigned char)(((x)>>24)&255);\
+		(y)[5] = (unsigned char)(((x)>>16)&255);\
+		(y)[6] = (unsigned char)(((x)>>8)&255);\
+		(y)[7] = (unsigned char)((x)&255); } while(0)
+
+#define STORE32H(x, y)                                                                     \
+  do { (y)[0] = (unsigned char)(((x)>>24)&255); (y)[1] = (unsigned char)(((x)>>16)&255);   \
+       (y)[2] = (unsigned char)(((x)>>8)&255); (y)[3] = (unsigned char)((x)&255); } while(0)
+
+#define LOAD32H(x, y)                            \
+  do { x = ((__u32)((y)[0] & 255)<<24) | \
+           ((__u32)((y)[1] & 255)<<16) | \
+           ((__u32)((y)[2] & 255)<<8)  | \
+           ((__u32)((y)[3] & 255)); } while(0)
+
+struct sha256_state {
+    __u64 length;
+    __u32 state[8], curlen;
+    unsigned char buf[64];
+};
+
+/* This is a highly simplified version from libtomcrypt */
+struct hash_state {
+	struct sha256_state sha256;
+};
+
+static void sha256_compress(struct hash_state * md, const unsigned char *buf)
+{
+    __u32 S[8], W[64], t0, t1;
+    __u32 t;
+    int i;
+
+    /* copy state into S */
+    for (i = 0; i < 8; i++) {
+        S[i] = md->sha256.state[i];
+    }
+
+    /* copy the state into 512-bits into W[0..15] */
+    for (i = 0; i < 16; i++) {
+        LOAD32H(W[i], buf + (4*i));
+    }
+
+    /* fill W[16..63] */
+    for (i = 16; i < 64; i++) {
+        W[i] = Gamma1(W[i - 2]) + W[i - 7] + Gamma0(W[i - 15]) + W[i - 16];
+    }        
+
+    /* Compress */
+     for (i = 0; i < 64; ++i) {
+         RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],i);
+         t = S[7]; S[7] = S[6]; S[6] = S[5]; S[5] = S[4]; 
+         S[4] = S[3]; S[3] = S[2]; S[2] = S[1]; S[1] = S[0]; S[0] = t;
+     }  
+
+    /* feedback */
+    for (i = 0; i < 8; i++) {
+        md->sha256.state[i] = md->sha256.state[i] + S[i];
+    }
+}
+
+static void sha256_init(struct hash_state * md)
+{
+    md->sha256.curlen = 0;
+    md->sha256.length = 0;
+    md->sha256.state[0] = 0x6A09E667UL;
+    md->sha256.state[1] = 0xBB67AE85UL;
+    md->sha256.state[2] = 0x3C6EF372UL;
+    md->sha256.state[3] = 0xA54FF53AUL;
+    md->sha256.state[4] = 0x510E527FUL;
+    md->sha256.state[5] = 0x9B05688CUL;
+    md->sha256.state[6] = 0x1F83D9ABUL;
+    md->sha256.state[7] = 0x5BE0CD19UL;
+}
+
+#define MIN(x, y) ( ((x)<(y))?(x):(y) )
+#define SHA256_BLOCKSIZE 64
+static void sha256_process(struct hash_state * md, const unsigned char *in, unsigned long inlen)
+{
+    unsigned long n;
+
+    while (inlen > 0) {
+	    if (md->sha256.curlen == 0 && inlen >= SHA256_BLOCKSIZE) {
+		    sha256_compress(md, in);
+		    md->sha256.length += SHA256_BLOCKSIZE * 8;
+		    in += SHA256_BLOCKSIZE;
+		    inlen -= SHA256_BLOCKSIZE;
+	    } else {
+		    n = MIN(inlen, (SHA256_BLOCKSIZE - md->sha256.curlen));
+		    memcpy(md->sha256.buf + md->sha256.curlen, in, (size_t)n);
+		    md->sha256.curlen += n;
+		    in += n;
+		    inlen -= n;
+		    if (md->sha256.curlen == SHA256_BLOCKSIZE) {
+			    sha256_compress(md, md->sha256.buf);
+			    md->sha256.length += 8*SHA256_BLOCKSIZE;
+			    md->sha256.curlen = 0;
+		    }
+	    }
+    }
+}
+
+
+static void sha256_done(struct hash_state * md, unsigned char *out)
+{
+    int i;
+
+    /* increase the length of the message */
+    md->sha256.length += md->sha256.curlen * 8;
+
+    /* append the '1' bit */
+    md->sha256.buf[md->sha256.curlen++] = (unsigned char)0x80;
+
+    /* if the length is currently above 56 bytes we append zeros
+     * then compress.  Then we can fall back to padding zeros and length
+     * encoding like normal.
+     */
+    if (md->sha256.curlen > 56) {
+        while (md->sha256.curlen < 64) {
+            md->sha256.buf[md->sha256.curlen++] = (unsigned char)0;
+        }
+        sha256_compress(md, md->sha256.buf);
+        md->sha256.curlen = 0;
+    }
+
+    /* pad upto 56 bytes of zeroes */
+    while (md->sha256.curlen < 56) {
+        md->sha256.buf[md->sha256.curlen++] = (unsigned char)0;
+    }
+
+    /* store length */
+    STORE64H(md->sha256.length, md->sha256.buf+56);
+    sha256_compress(md, md->sha256.buf);
+
+    /* copy output */
+    for (i = 0; i < 8; i++) {
+        STORE32H(md->sha256.state[i], out+(4*i));
+    }
+}
+
+void ext2fs_sha256(unsigned char *in, unsigned long in_size,
+		   unsigned char out[EXT2FS_SHA256_LENGTH])
+{
+	struct hash_state md;
+
+	sha256_init(&md);
+	sha256_process(&md, in, in_size);
+	sha256_done(&md, out);
+}
+
+#ifdef UNITTEST
+static const struct {
+	char *msg;
+	unsigned char hash[32];
+} tests[] = {
+	{ "",
+	  { 0xe3, 0xb0, 0xc4, 0x42, 0x98, 0xfc, 0x1c, 0x14,
+	    0x9a, 0xfb, 0xf4, 0xc8, 0x99, 0x6f, 0xb9, 0x24,
+	    0x27, 0xae, 0x41, 0xe4, 0x64, 0x9b, 0x93, 0x4c,
+	    0xa4, 0x95, 0x99, 0x1b, 0x78, 0x52, 0xb8, 0x55 }
+	},
+	{ "abc",
+	  { 0xba, 0x78, 0x16, 0xbf, 0x8f, 0x01, 0xcf, 0xea,
+	    0x41, 0x41, 0x40, 0xde, 0x5d, 0xae, 0x22, 0x23,
+	    0xb0, 0x03, 0x61, 0xa3, 0x96, 0x17, 0x7a, 0x9c,
+	    0xb4, 0x10, 0xff, 0x61, 0xf2, 0x00, 0x15, 0xad }
+	},
+	{ "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq",
+	  { 0x24, 0x8d, 0x6a, 0x61, 0xd2, 0x06, 0x38, 0xb8,
+	    0xe5, 0xc0, 0x26, 0x93, 0x0c, 0x3e, 0x60, 0x39,
+	    0xa3, 0x3c, 0xe4, 0x59, 0x64, 0xff, 0x21, 0x67,
+	    0xf6, 0xec, 0xed, 0xd4, 0x19, 0xdb, 0x06, 0xc1 }
+	},
+};
+
+int main(int argc, char **argv)
+{
+	int i;
+	int errors = 0;
+	unsigned char tmp[32];
+	struct hash_state md;
+
+	for (i = 0; i < (int)(sizeof(tests) / sizeof(tests[0])); i++) {
+		unsigned char *msg = (unsigned char *) tests[i].msg;
+		int len = strlen(tests[i].msg);
+
+		ext2fs_sha256(msg, len, tmp);
+		printf("SHA256 test message %d: ", i);
+		if (memcmp(tmp, tests[i].hash, 32) != 0) {
+			printf("FAILED\n");
+			errors++;
+		} else
+			printf("OK\n");
+	}
+	return errors;
+}
+
+#endif /* UNITTEST */
diff --git a/lib/ext2fs/sha512.c b/lib/ext2fs/sha512.c
new file mode 100644
index 000000000..e23cdd0c1
--- /dev/null
+++ b/lib/ext2fs/sha512.c
@@ -0,0 +1,303 @@
+/*
+ * sha512.c --- The sha512 algorithm
+ *
+ * Copyright (C) 2004 Sam Hocevar <sam@hocevar.net>
+ * (copied from libtomcrypt and then relicensed under GPLv2)
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the GNU Library
+ * General Public License, version 2.
+ * %End-Header%
+ */
+
+
+#include "config.h"
+#if HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+#include "ext2fs.h"
+
+/* the K array */
+#define CONST64(n) n
+static const __u64 K[80] = {
+	CONST64(0x428a2f98d728ae22), CONST64(0x7137449123ef65cd),
+	CONST64(0xb5c0fbcfec4d3b2f), CONST64(0xe9b5dba58189dbbc),
+	CONST64(0x3956c25bf348b538), CONST64(0x59f111f1b605d019),
+	CONST64(0x923f82a4af194f9b), CONST64(0xab1c5ed5da6d8118),
+	CONST64(0xd807aa98a3030242), CONST64(0x12835b0145706fbe),
+	CONST64(0x243185be4ee4b28c), CONST64(0x550c7dc3d5ffb4e2),
+	CONST64(0x72be5d74f27b896f), CONST64(0x80deb1fe3b1696b1),
+	CONST64(0x9bdc06a725c71235), CONST64(0xc19bf174cf692694),
+	CONST64(0xe49b69c19ef14ad2), CONST64(0xefbe4786384f25e3),
+	CONST64(0x0fc19dc68b8cd5b5), CONST64(0x240ca1cc77ac9c65),
+	CONST64(0x2de92c6f592b0275), CONST64(0x4a7484aa6ea6e483),
+	CONST64(0x5cb0a9dcbd41fbd4), CONST64(0x76f988da831153b5),
+	CONST64(0x983e5152ee66dfab), CONST64(0xa831c66d2db43210),
+	CONST64(0xb00327c898fb213f), CONST64(0xbf597fc7beef0ee4),
+	CONST64(0xc6e00bf33da88fc2), CONST64(0xd5a79147930aa725),
+	CONST64(0x06ca6351e003826f), CONST64(0x142929670a0e6e70),
+	CONST64(0x27b70a8546d22ffc), CONST64(0x2e1b21385c26c926),
+	CONST64(0x4d2c6dfc5ac42aed), CONST64(0x53380d139d95b3df),
+	CONST64(0x650a73548baf63de), CONST64(0x766a0abb3c77b2a8),
+	CONST64(0x81c2c92e47edaee6), CONST64(0x92722c851482353b),
+	CONST64(0xa2bfe8a14cf10364), CONST64(0xa81a664bbc423001),
+	CONST64(0xc24b8b70d0f89791), CONST64(0xc76c51a30654be30),
+	CONST64(0xd192e819d6ef5218), CONST64(0xd69906245565a910),
+	CONST64(0xf40e35855771202a), CONST64(0x106aa07032bbd1b8),
+	CONST64(0x19a4c116b8d2d0c8), CONST64(0x1e376c085141ab53),
+	CONST64(0x2748774cdf8eeb99), CONST64(0x34b0bcb5e19b48a8),
+	CONST64(0x391c0cb3c5c95a63), CONST64(0x4ed8aa4ae3418acb),
+	CONST64(0x5b9cca4f7763e373), CONST64(0x682e6ff3d6b2b8a3),
+	CONST64(0x748f82ee5defb2fc), CONST64(0x78a5636f43172f60),
+	CONST64(0x84c87814a1f0ab72), CONST64(0x8cc702081a6439ec),
+	CONST64(0x90befffa23631e28), CONST64(0xa4506cebde82bde9),
+	CONST64(0xbef9a3f7b2c67915), CONST64(0xc67178f2e372532b),
+	CONST64(0xca273eceea26619c), CONST64(0xd186b8c721c0c207),
+	CONST64(0xeada7dd6cde0eb1e), CONST64(0xf57d4f7fee6ed178),
+	CONST64(0x06f067aa72176fba), CONST64(0x0a637dc5a2c898a6),
+	CONST64(0x113f9804bef90dae), CONST64(0x1b710b35131c471b),
+	CONST64(0x28db77f523047d84), CONST64(0x32caab7b40c72493),
+	CONST64(0x3c9ebe0a15c9bebc), CONST64(0x431d67c49c100d4c),
+	CONST64(0x4cc5d4becb3e42b6), CONST64(0x597f299cfc657e2a),
+	CONST64(0x5fcb6fab3ad6faec), CONST64(0x6c44198c4a475817)
+};
+#define Ch(x,y,z)       (z ^ (x & (y ^ z)))
+#define Maj(x,y,z)      (((x | y) & z) | (x & y))
+#define S(x, n)         ROR64c(x, n)
+#define R(x, n)         (((x)&CONST64(0xFFFFFFFFFFFFFFFF))>>((__u64)n))
+#define Sigma0(x)       (S(x, 28) ^ S(x, 34) ^ S(x, 39))
+#define Sigma1(x)       (S(x, 14) ^ S(x, 18) ^ S(x, 41))
+#define Gamma0(x)       (S(x, 1) ^ S(x, 8) ^ R(x, 7))
+#define Gamma1(x)       (S(x, 19) ^ S(x, 61) ^ R(x, 6))
+#define RND(a,b,c,d,e,f,g,h,i)\
+		t0 = h + Sigma1(e) + Ch(e, f, g) + K[i] + W[i];\
+		t1 = Sigma0(a) + Maj(a, b, c);\
+		d += t0;\
+		h  = t0 + t1;
+#define STORE64H(x, y) \
+	do { \
+		(y)[0] = (unsigned char)(((x)>>56)&255);\
+		(y)[1] = (unsigned char)(((x)>>48)&255);\
+		(y)[2] = (unsigned char)(((x)>>40)&255);\
+		(y)[3] = (unsigned char)(((x)>>32)&255);\
+		(y)[4] = (unsigned char)(((x)>>24)&255);\
+		(y)[5] = (unsigned char)(((x)>>16)&255);\
+		(y)[6] = (unsigned char)(((x)>>8)&255);\
+		(y)[7] = (unsigned char)((x)&255); } while(0)
+
+#define LOAD64H(x, y)\
+	do {x = \
+		(((__u64)((y)[0] & 255)) << 56) |\
+		(((__u64)((y)[1] & 255)) << 48) |\
+		(((__u64)((y)[2] & 255)) << 40) |\
+		(((__u64)((y)[3] & 255)) << 32) |\
+		(((__u64)((y)[4] & 255)) << 24) |\
+		(((__u64)((y)[5] & 255)) << 16) |\
+		(((__u64)((y)[6] & 255)) << 8) |\
+		(((__u64)((y)[7] & 255)));\
+	} while(0)
+
+#define ROR64c(x, y) \
+    ( ((((x)&CONST64(0xFFFFFFFFFFFFFFFF))>>((__u64)(y)&CONST64(63))) | \
+      ((x)<<((__u64)(64-((y)&CONST64(63)))))) & CONST64(0xFFFFFFFFFFFFFFFF))
+
+struct sha512_state {
+	__u64  length, state[8];
+	unsigned long curlen;
+	unsigned char buf[128];
+};
+
+/* This is a highly simplified version from libtomcrypt */
+struct hash_state {
+	struct sha512_state sha512;
+};
+
+static void sha512_compress(struct hash_state * md, const unsigned char *buf)
+{
+	__u64 S[8], W[80], t0, t1;
+	int i;
+
+	/* copy state into S */
+	for (i = 0; i < 8; i++) {
+		S[i] = md->sha512.state[i];
+	}
+
+	/* copy the state into 1024-bits into W[0..15] */
+	for (i = 0; i < 16; i++) {
+		LOAD64H(W[i], buf + (8*i));
+	}
+
+	/* fill W[16..79] */
+	for (i = 16; i < 80; i++) {
+		W[i] = Gamma1(W[i - 2]) + W[i - 7] +
+			Gamma0(W[i - 15]) + W[i - 16];
+	}
+
+	for (i = 0; i < 80; i += 8) {
+		RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],i+0);
+		RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],i+1);
+		RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],i+2);
+		RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],i+3);
+		RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],i+4);
+		RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],i+5);
+		RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],i+6);
+		RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],i+7);
+	}
+
+	 /* feedback */
+	for (i = 0; i < 8; i++) {
+		md->sha512.state[i] = md->sha512.state[i] + S[i];
+	}
+}
+
+static void sha512_init(struct hash_state * md)
+{
+	md->sha512.curlen = 0;
+	md->sha512.length = 0;
+	md->sha512.state[0] = CONST64(0x6a09e667f3bcc908);
+	md->sha512.state[1] = CONST64(0xbb67ae8584caa73b);
+	md->sha512.state[2] = CONST64(0x3c6ef372fe94f82b);
+	md->sha512.state[3] = CONST64(0xa54ff53a5f1d36f1);
+	md->sha512.state[4] = CONST64(0x510e527fade682d1);
+	md->sha512.state[5] = CONST64(0x9b05688c2b3e6c1f);
+	md->sha512.state[6] = CONST64(0x1f83d9abfb41bd6b);
+	md->sha512.state[7] = CONST64(0x5be0cd19137e2179);
+}
+
+static void sha512_done(struct hash_state * md, unsigned char *out)
+{
+	int i;
+
+	/* increase the length of the message */
+	md->sha512.length += md->sha512.curlen * CONST64(8);
+
+	/* append the '1' bit */
+	md->sha512.buf[md->sha512.curlen++] = (unsigned char)0x80;
+
+	/* if the length is currently above 112 bytes we append zeros then
+	 * compress. Then we can fall back to padding zeros and length encoding
+	 * like normal. */
+	if (md->sha512.curlen > 112) {
+		while (md->sha512.curlen < 128) {
+			md->sha512.buf[md->sha512.curlen++] = (unsigned char)0;
+		}
+		sha512_compress(md, md->sha512.buf);
+		md->sha512.curlen = 0;
+	}
+
+	/* pad upto 120 bytes of zeroes note: that from 112 to 120 is the 64 MSB
+	 * of the length. We assume that you won't hash > 2^64 bits of data. */
+	while (md->sha512.curlen < 120) {
+		md->sha512.buf[md->sha512.curlen++] = (unsigned char)0;
+	}
+
+	/* store length */
+	STORE64H(md->sha512.length, md->sha512.buf + 120);
+	sha512_compress(md, md->sha512.buf);
+
+	/* copy output */
+	for (i = 0; i < 8; i++) {
+		STORE64H(md->sha512.state[i], out+(8 * i));
+	}
+}
+
+#define MIN(x, y) ( ((x)<(y))?(x):(y) )
+#define SHA512_BLOCKSIZE 512
+static void sha512_process(struct hash_state * md,
+			   unsigned char *in,
+			   unsigned long inlen)
+{
+	unsigned long n;
+
+	while (inlen > 0) {
+		if (md->sha512.curlen == 0 && inlen >= SHA512_BLOCKSIZE) {
+			sha512_compress(md, in);
+			md->sha512.length += SHA512_BLOCKSIZE * 8;
+			in += SHA512_BLOCKSIZE;
+			inlen -= SHA512_BLOCKSIZE;
+		} else {
+			n = MIN(inlen, (SHA512_BLOCKSIZE - md->sha512.curlen));
+			memcpy(md->sha512.buf + md->sha512.curlen,
+			       in, (size_t)n);
+			md->sha512.curlen += n;
+			in += n;
+			inlen -= n;
+			if (md->sha512.curlen == SHA512_BLOCKSIZE) {
+				sha512_compress(md, md->sha512.buf);
+				md->sha512.length += SHA512_BLOCKSIZE * 8;
+				md->sha512.curlen = 0;
+			}
+		}
+	}
+}
+
+void ext2fs_sha512(unsigned char *in, unsigned long in_size,
+		   unsigned char out[EXT2FS_SHA512_LENGTH])
+{
+	struct hash_state md;
+
+	sha512_init(&md);
+	sha512_process(&md, in, in_size);
+	sha512_done(&md, out);
+}
+
+#ifdef UNITTEST
+static const struct {
+	char *msg;
+	unsigned char hash[64];
+} tests[] = {
+	{ "",
+	  { 0xcf, 0x83, 0xe1, 0x35, 0x7e, 0xef, 0xb8, 0xbd,
+	    0xf1, 0x54, 0x28, 0x50, 0xd6, 0x6d, 0x80, 0x07,
+	    0xd6, 0x20, 0xe4, 0x05, 0x0b, 0x57, 0x15, 0xdc,
+	    0x83, 0xf4, 0xa9, 0x21, 0xd3, 0x6c, 0xe9, 0xce,
+	    0x47, 0xd0, 0xd1, 0x3c, 0x5d, 0x85, 0xf2, 0xb0,
+	    0xff, 0x83, 0x18, 0xd2, 0x87, 0x7e, 0xec, 0x2f,
+	    0x63, 0xb9, 0x31, 0xbd, 0x47, 0x41, 0x7a, 0x81,
+	    0xa5, 0x38, 0x32, 0x7a, 0xf9, 0x27, 0xda, 0x3e }
+	},
+	{ "abc",
+	  { 0xdd, 0xaf, 0x35, 0xa1, 0x93, 0x61, 0x7a, 0xba,
+	    0xcc, 0x41, 0x73, 0x49, 0xae, 0x20, 0x41, 0x31,
+	    0x12, 0xe6, 0xfa, 0x4e, 0x89, 0xa9, 0x7e, 0xa2,
+	    0x0a, 0x9e, 0xee, 0xe6, 0x4b, 0x55, 0xd3, 0x9a,
+	    0x21, 0x92, 0x99, 0x2a, 0x27, 0x4f, 0xc1, 0xa8,
+	    0x36, 0xba, 0x3c, 0x23, 0xa3, 0xfe, 0xeb, 0xbd,
+	    0x45, 0x4d, 0x44, 0x23, 0x64, 0x3c, 0xe8, 0x0e,
+	    0x2a, 0x9a, 0xc9, 0x4f, 0xa5, 0x4c, 0xa4, 0x9f }
+	},
+	{ "abcdefghbcdefghicdefghijdefghijkefghijklfghijklmghijklmnhijklmnoijklmnopjklmnopqklmnopqrlmnopqrsmnopqrstnopqrstu",
+	  { 0x8e, 0x95, 0x9b, 0x75, 0xda, 0xe3, 0x13, 0xda,
+	    0x8c, 0xf4, 0xf7, 0x28, 0x14, 0xfc, 0x14, 0x3f,
+	    0x8f, 0x77, 0x79, 0xc6, 0xeb, 0x9f, 0x7f, 0xa1,
+	    0x72, 0x99, 0xae, 0xad, 0xb6, 0x88, 0x90, 0x18,
+	    0x50, 0x1d, 0x28, 0x9e, 0x49, 0x00, 0xf7, 0xe4,
+	    0x33, 0x1b, 0x99, 0xde, 0xc4, 0xb5, 0x43, 0x3a,
+	    0xc7, 0xd3, 0x29, 0xee, 0xb6, 0xdd, 0x26, 0x54,
+	    0x5e, 0x96, 0xe5, 0x5b, 0x87, 0x4b, 0xe9, 0x09 }
+	},
+};
+
+int main(int argc, char **argv)
+{
+	int i;
+	int errors = 0;
+	unsigned char tmp[64];
+	struct hash_state md;
+
+	for (i = 0; i < (int)(sizeof(tests) / sizeof(tests[0])); i++) {
+		unsigned char *msg = (unsigned char *) tests[i].msg;
+		int len = strlen(tests[i].msg);
+
+		ext2fs_sha512(msg, len, tmp);
+		printf("SHA512 test message %d: ", i);
+		if (memcmp(tmp, tests[i].hash, 64) != 0) {
+			printf("FAILED\n");
+			errors++;
+		} else
+			printf("OK\n");
+	}
+	return errors;
+}
+
+#endif /* UNITTEST */