Move MD5 out into its own file.
This begins a programme of code reorganisation at the end of which I'd like to end up with something almost legible :-)
This commit is contained in:
Simon Tatham
parent
7de9585efb
commit
ca59ebf60d
5 changed files with 275 additions and 255 deletions
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@ -6,7 +6,7 @@ lib_LTLIBRARIES = libwinterop.so.la libmsi.so.la libpreload.la
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libwinterop_so_la_SOURCES = fake-winterop.c fake-lib.c fake-lib.h
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libmsi_so_la_SOURCES = fake-msi.c fake-lib.c fake-lib.h
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libmsi_so_la_SOURCES = fake-msi.c fake-lib.c fake-lib.h md5.c
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libpreload_la_SOURCES = preload.c
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libpreload_la_LDFLAGS = -ldl
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214
fake-lib.c
214
fake-lib.c
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@ -140,217 +140,3 @@ unsigned le(const unsigned char *buf, size_t len, size_t off, size_t nbytes)
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}
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return toret;
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}
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/* ----------------------------------------------------------------------
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* Core MD5 algorithm: processes 16-word blocks into a message digest.
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*/
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typedef struct {
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uint32_t h[4];
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} MD5_Core_State;
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struct MD5Context {
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MD5_Core_State core;
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unsigned char block[64];
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int blkused;
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uint32_t lenhi, lenlo;
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};
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#define F(x,y,z) ( ((x) & (y)) | ((~(x)) & (z)) )
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#define G(x,y,z) ( ((x) & (z)) | ((~(z)) & (y)) )
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#define H(x,y,z) ( (x) ^ (y) ^ (z) )
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#define I(x,y,z) ( (y) ^ ( (x) | ~(z) ) )
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#define rol(x,y) ( ((x) << (y)) | (((uint32_t)x) >> (32-y)) )
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#define subround(f,w,x,y,z,k,s,ti) \
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w = x + rol(w + f(x,y,z) + block[k] + ti, s)
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static void MD5_Core_Init(MD5_Core_State * s)
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{
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s->h[0] = 0x67452301;
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s->h[1] = 0xefcdab89;
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s->h[2] = 0x98badcfe;
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s->h[3] = 0x10325476;
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}
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static void MD5_Block(MD5_Core_State * s, uint32_t * block)
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{
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uint32_t a, b, c, d;
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a = s->h[0];
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b = s->h[1];
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c = s->h[2];
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d = s->h[3];
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subround(F, a, b, c, d, 0, 7, 0xd76aa478);
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subround(F, d, a, b, c, 1, 12, 0xe8c7b756);
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subround(F, c, d, a, b, 2, 17, 0x242070db);
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subround(F, b, c, d, a, 3, 22, 0xc1bdceee);
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subround(F, a, b, c, d, 4, 7, 0xf57c0faf);
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subround(F, d, a, b, c, 5, 12, 0x4787c62a);
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subround(F, c, d, a, b, 6, 17, 0xa8304613);
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subround(F, b, c, d, a, 7, 22, 0xfd469501);
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subround(F, a, b, c, d, 8, 7, 0x698098d8);
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subround(F, d, a, b, c, 9, 12, 0x8b44f7af);
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subround(F, c, d, a, b, 10, 17, 0xffff5bb1);
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subround(F, b, c, d, a, 11, 22, 0x895cd7be);
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subround(F, a, b, c, d, 12, 7, 0x6b901122);
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subround(F, d, a, b, c, 13, 12, 0xfd987193);
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subround(F, c, d, a, b, 14, 17, 0xa679438e);
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subround(F, b, c, d, a, 15, 22, 0x49b40821);
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subround(G, a, b, c, d, 1, 5, 0xf61e2562);
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subround(G, d, a, b, c, 6, 9, 0xc040b340);
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subround(G, c, d, a, b, 11, 14, 0x265e5a51);
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subround(G, b, c, d, a, 0, 20, 0xe9b6c7aa);
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subround(G, a, b, c, d, 5, 5, 0xd62f105d);
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subround(G, d, a, b, c, 10, 9, 0x02441453);
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subround(G, c, d, a, b, 15, 14, 0xd8a1e681);
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subround(G, b, c, d, a, 4, 20, 0xe7d3fbc8);
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subround(G, a, b, c, d, 9, 5, 0x21e1cde6);
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subround(G, d, a, b, c, 14, 9, 0xc33707d6);
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subround(G, c, d, a, b, 3, 14, 0xf4d50d87);
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subround(G, b, c, d, a, 8, 20, 0x455a14ed);
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subround(G, a, b, c, d, 13, 5, 0xa9e3e905);
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subround(G, d, a, b, c, 2, 9, 0xfcefa3f8);
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subround(G, c, d, a, b, 7, 14, 0x676f02d9);
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subround(G, b, c, d, a, 12, 20, 0x8d2a4c8a);
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subround(H, a, b, c, d, 5, 4, 0xfffa3942);
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subround(H, d, a, b, c, 8, 11, 0x8771f681);
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subround(H, c, d, a, b, 11, 16, 0x6d9d6122);
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subround(H, b, c, d, a, 14, 23, 0xfde5380c);
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subround(H, a, b, c, d, 1, 4, 0xa4beea44);
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subround(H, d, a, b, c, 4, 11, 0x4bdecfa9);
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subround(H, c, d, a, b, 7, 16, 0xf6bb4b60);
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subround(H, b, c, d, a, 10, 23, 0xbebfbc70);
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subround(H, a, b, c, d, 13, 4, 0x289b7ec6);
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subround(H, d, a, b, c, 0, 11, 0xeaa127fa);
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subround(H, c, d, a, b, 3, 16, 0xd4ef3085);
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subround(H, b, c, d, a, 6, 23, 0x04881d05);
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subround(H, a, b, c, d, 9, 4, 0xd9d4d039);
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subround(H, d, a, b, c, 12, 11, 0xe6db99e5);
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subround(H, c, d, a, b, 15, 16, 0x1fa27cf8);
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subround(H, b, c, d, a, 2, 23, 0xc4ac5665);
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subround(I, a, b, c, d, 0, 6, 0xf4292244);
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subround(I, d, a, b, c, 7, 10, 0x432aff97);
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subround(I, c, d, a, b, 14, 15, 0xab9423a7);
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subround(I, b, c, d, a, 5, 21, 0xfc93a039);
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subround(I, a, b, c, d, 12, 6, 0x655b59c3);
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subround(I, d, a, b, c, 3, 10, 0x8f0ccc92);
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subround(I, c, d, a, b, 10, 15, 0xffeff47d);
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subround(I, b, c, d, a, 1, 21, 0x85845dd1);
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subround(I, a, b, c, d, 8, 6, 0x6fa87e4f);
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subround(I, d, a, b, c, 15, 10, 0xfe2ce6e0);
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subround(I, c, d, a, b, 6, 15, 0xa3014314);
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subround(I, b, c, d, a, 13, 21, 0x4e0811a1);
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subround(I, a, b, c, d, 4, 6, 0xf7537e82);
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subround(I, d, a, b, c, 11, 10, 0xbd3af235);
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subround(I, c, d, a, b, 2, 15, 0x2ad7d2bb);
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subround(I, b, c, d, a, 9, 21, 0xeb86d391);
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s->h[0] += a;
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s->h[1] += b;
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s->h[2] += c;
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s->h[3] += d;
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}
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/* ----------------------------------------------------------------------
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* Outer MD5 algorithm: take an arbitrary length byte string,
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* convert it into 16-word blocks with the prescribed padding at
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* the end, and pass those blocks to the core MD5 algorithm.
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*/
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#define BLKSIZE 64
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void MD5Init(struct MD5Context *s)
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{
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MD5_Core_Init(&s->core);
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s->blkused = 0;
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s->lenhi = s->lenlo = 0;
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}
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void MD5Update(struct MD5Context *s, unsigned char const *p, unsigned len)
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{
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unsigned char *q = (unsigned char *) p;
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uint32_t wordblock[16];
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uint32_t lenw = len;
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int i;
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/*
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* Update the length field.
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*/
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s->lenlo += lenw;
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s->lenhi += (s->lenlo < lenw);
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if (s->blkused + len < BLKSIZE) {
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/*
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* Trivial case: just add to the block.
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*/
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memcpy(s->block + s->blkused, q, len);
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s->blkused += len;
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} else {
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/*
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* We must complete and process at least one block.
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*/
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while (s->blkused + len >= BLKSIZE) {
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memcpy(s->block + s->blkused, q, BLKSIZE - s->blkused);
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q += BLKSIZE - s->blkused;
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len -= BLKSIZE - s->blkused;
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/* Now process the block. Gather bytes little-endian into words */
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for (i = 0; i < 16; i++) {
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wordblock[i] =
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(((uint32_t) s->block[i * 4 + 3]) << 24) |
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(((uint32_t) s->block[i * 4 + 2]) << 16) |
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(((uint32_t) s->block[i * 4 + 1]) << 8) |
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(((uint32_t) s->block[i * 4 + 0]) << 0);
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}
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MD5_Block(&s->core, wordblock);
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s->blkused = 0;
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}
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memcpy(s->block, q, len);
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s->blkused = len;
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}
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}
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void MD5Final(uint32_t output[4], struct MD5Context *s)
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{
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int i;
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unsigned pad;
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unsigned char c[64];
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uint32_t lenhi, lenlo;
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if (s->blkused >= 56)
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pad = 56 + 64 - s->blkused;
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else
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pad = 56 - s->blkused;
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lenhi = (s->lenhi << 3) | (s->lenlo >> (32 - 3));
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lenlo = (s->lenlo << 3);
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memset(c, 0, pad);
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c[0] = 0x80;
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MD5Update(s, c, pad);
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c[7] = (lenhi >> 24) & 0xFF;
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c[6] = (lenhi >> 16) & 0xFF;
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c[5] = (lenhi >> 8) & 0xFF;
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c[4] = (lenhi >> 0) & 0xFF;
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c[3] = (lenlo >> 24) & 0xFF;
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c[2] = (lenlo >> 16) & 0xFF;
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c[1] = (lenlo >> 8) & 0xFF;
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c[0] = (lenlo >> 0) & 0xFF;
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MD5Update(s, c, 8);
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for (i = 0; i < 4; i++)
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output[i] = s->core.h[i];
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}
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void MD5Simple(void const *p, unsigned len, uint32_t output[4])
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{
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struct MD5Context s;
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MD5Init(&s);
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MD5Update(&s, (unsigned char const *)p, len);
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MD5Final(output, &s);
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}
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@ -1,3 +1,6 @@
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#include <uchar.h>
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#include <stdlib.h>
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char *ascii(const char16_t *wstr, bool translate_slashes);
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void system_argv(const char *cmd, ...);
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void system_argv_array(char **args);
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@ -6,7 +9,6 @@ void *smalloc(size_t size);
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void *srealloc(void *ptr, size_t size);
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char *dupcat(const char *str, ...);
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unsigned le(const unsigned char *buf, size_t len, size_t off, size_t nbytes);
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void MD5Simple(void const *p, unsigned len, uint32_t output[4]);
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#define snew(type) ((type *)smalloc(sizeof(type)))
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#define snewn(n,type) ((type *)smalloc((n)*sizeof(type)))
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39
fake-msi.c
39
fake-msi.c
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@ -199,45 +199,6 @@ uint32_t MsiGetFileVersionW(const char16_t *filename,
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return toret;
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}
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struct MsiHash {
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uint32_t structure_size;
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uint32_t hash_words[4];
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};
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uint32_t MsiGetFileHashW(const char16_t *filename, uint32_t options,
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struct MsiHash *hash)
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{
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char *fname = ascii(filename, true);
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int fd = -1;
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void *mapv = MAP_FAILED;
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uint32_t toret;
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fd = open(fname, O_RDONLY);
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if (fd < 0)
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err(1, "%s: open", fname);
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struct stat st;
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if (fstat(fd, &st) < 0)
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err(1, "%s: fstat", fname);
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size_t fsize = st.st_size;
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mapv = mmap(NULL, fsize, PROT_READ, MAP_PRIVATE, fd, 0);
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if (mapv == MAP_FAILED)
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err(1, "%s: mmap", fname);
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MD5Simple(mapv, fsize, hash->hash_words);
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warnx("MsiGetFileHash(%s) -> %08x:%08x:%08x:%08x", fname,
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(unsigned)hash->hash_words[0], (unsigned)hash->hash_words[1],
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(unsigned)hash->hash_words[2], (unsigned)hash->hash_words[3]);
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toret = 0;
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cleanup:
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if (mapv != MAP_FAILED)
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munmap(mapv, fsize);
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if (fd != -1)
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close(fd);
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sfree(fname);
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return toret;
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}
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typedef struct MsiTypePrefix {
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enum { MAIN, VIEW, RECORD } type;
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} MsiTypePrefix;
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271
md5.c
Normal file
271
md5.c
Normal file
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@ -0,0 +1,271 @@
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/*
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* Implement MsiGetFileHash().
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*
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* Experimenting with a small test program on Windows calling the
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* original version of that function suggests that the hash it
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* implements is just MD5, only repackaged as an array of four
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* little-endian 32-bit words instead of the usual 16 bytes.
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include <string.h>
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#include <stdbool.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <err.h>
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#include "fake-lib.h"
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/* ----------------------------------------------------------------------
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* Core MD5 algorithm: processes 16-word blocks into a message digest.
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*/
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typedef struct {
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uint32_t h[4];
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} MD5_Core_State;
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struct MD5Context {
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MD5_Core_State core;
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unsigned char block[64];
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int blkused;
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uint64_t len;
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};
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#define F(x,y,z) ( ((x) & (y)) | ((~(x)) & (z)) )
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#define G(x,y,z) ( ((x) & (z)) | ((~(z)) & (y)) )
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#define H(x,y,z) ( (x) ^ (y) ^ (z) )
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#define I(x,y,z) ( (y) ^ ( (x) | ~(z) ) )
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#define rol(x,y) ( ((x) << (y)) | (((uint32_t)x) >> (32-y)) )
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#define subround(f,w,x,y,z,k,s,ti) \
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w = x + rol(w + f(x,y,z) + block[k] + ti, s)
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static void MD5_Core_Init(MD5_Core_State * s)
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{
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s->h[0] = 0x67452301;
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s->h[1] = 0xefcdab89;
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s->h[2] = 0x98badcfe;
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s->h[3] = 0x10325476;
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}
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static void MD5_Block(MD5_Core_State * s, uint32_t * block)
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{
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uint32_t a, b, c, d;
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a = s->h[0];
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b = s->h[1];
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c = s->h[2];
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d = s->h[3];
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subround(F, a, b, c, d, 0, 7, 0xd76aa478);
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subround(F, d, a, b, c, 1, 12, 0xe8c7b756);
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subround(F, c, d, a, b, 2, 17, 0x242070db);
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subround(F, b, c, d, a, 3, 22, 0xc1bdceee);
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subround(F, a, b, c, d, 4, 7, 0xf57c0faf);
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subround(F, d, a, b, c, 5, 12, 0x4787c62a);
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subround(F, c, d, a, b, 6, 17, 0xa8304613);
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subround(F, b, c, d, a, 7, 22, 0xfd469501);
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subround(F, a, b, c, d, 8, 7, 0x698098d8);
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subround(F, d, a, b, c, 9, 12, 0x8b44f7af);
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subround(F, c, d, a, b, 10, 17, 0xffff5bb1);
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subround(F, b, c, d, a, 11, 22, 0x895cd7be);
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subround(F, a, b, c, d, 12, 7, 0x6b901122);
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subround(F, d, a, b, c, 13, 12, 0xfd987193);
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subround(F, c, d, a, b, 14, 17, 0xa679438e);
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subround(F, b, c, d, a, 15, 22, 0x49b40821);
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subround(G, a, b, c, d, 1, 5, 0xf61e2562);
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subround(G, d, a, b, c, 6, 9, 0xc040b340);
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subround(G, c, d, a, b, 11, 14, 0x265e5a51);
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subround(G, b, c, d, a, 0, 20, 0xe9b6c7aa);
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||||
subround(G, a, b, c, d, 5, 5, 0xd62f105d);
|
||||
subround(G, d, a, b, c, 10, 9, 0x02441453);
|
||||
subround(G, c, d, a, b, 15, 14, 0xd8a1e681);
|
||||
subround(G, b, c, d, a, 4, 20, 0xe7d3fbc8);
|
||||
subround(G, a, b, c, d, 9, 5, 0x21e1cde6);
|
||||
subround(G, d, a, b, c, 14, 9, 0xc33707d6);
|
||||
subround(G, c, d, a, b, 3, 14, 0xf4d50d87);
|
||||
subround(G, b, c, d, a, 8, 20, 0x455a14ed);
|
||||
subround(G, a, b, c, d, 13, 5, 0xa9e3e905);
|
||||
subround(G, d, a, b, c, 2, 9, 0xfcefa3f8);
|
||||
subround(G, c, d, a, b, 7, 14, 0x676f02d9);
|
||||
subround(G, b, c, d, a, 12, 20, 0x8d2a4c8a);
|
||||
subround(H, a, b, c, d, 5, 4, 0xfffa3942);
|
||||
subround(H, d, a, b, c, 8, 11, 0x8771f681);
|
||||
subround(H, c, d, a, b, 11, 16, 0x6d9d6122);
|
||||
subround(H, b, c, d, a, 14, 23, 0xfde5380c);
|
||||
subround(H, a, b, c, d, 1, 4, 0xa4beea44);
|
||||
subround(H, d, a, b, c, 4, 11, 0x4bdecfa9);
|
||||
subround(H, c, d, a, b, 7, 16, 0xf6bb4b60);
|
||||
subround(H, b, c, d, a, 10, 23, 0xbebfbc70);
|
||||
subround(H, a, b, c, d, 13, 4, 0x289b7ec6);
|
||||
subround(H, d, a, b, c, 0, 11, 0xeaa127fa);
|
||||
subround(H, c, d, a, b, 3, 16, 0xd4ef3085);
|
||||
subround(H, b, c, d, a, 6, 23, 0x04881d05);
|
||||
subround(H, a, b, c, d, 9, 4, 0xd9d4d039);
|
||||
subround(H, d, a, b, c, 12, 11, 0xe6db99e5);
|
||||
subround(H, c, d, a, b, 15, 16, 0x1fa27cf8);
|
||||
subround(H, b, c, d, a, 2, 23, 0xc4ac5665);
|
||||
subround(I, a, b, c, d, 0, 6, 0xf4292244);
|
||||
subround(I, d, a, b, c, 7, 10, 0x432aff97);
|
||||
subround(I, c, d, a, b, 14, 15, 0xab9423a7);
|
||||
subround(I, b, c, d, a, 5, 21, 0xfc93a039);
|
||||
subround(I, a, b, c, d, 12, 6, 0x655b59c3);
|
||||
subround(I, d, a, b, c, 3, 10, 0x8f0ccc92);
|
||||
subround(I, c, d, a, b, 10, 15, 0xffeff47d);
|
||||
subround(I, b, c, d, a, 1, 21, 0x85845dd1);
|
||||
subround(I, a, b, c, d, 8, 6, 0x6fa87e4f);
|
||||
subround(I, d, a, b, c, 15, 10, 0xfe2ce6e0);
|
||||
subround(I, c, d, a, b, 6, 15, 0xa3014314);
|
||||
subround(I, b, c, d, a, 13, 21, 0x4e0811a1);
|
||||
subround(I, a, b, c, d, 4, 6, 0xf7537e82);
|
||||
subround(I, d, a, b, c, 11, 10, 0xbd3af235);
|
||||
subround(I, c, d, a, b, 2, 15, 0x2ad7d2bb);
|
||||
subround(I, b, c, d, a, 9, 21, 0xeb86d391);
|
||||
|
||||
s->h[0] += a;
|
||||
s->h[1] += b;
|
||||
s->h[2] += c;
|
||||
s->h[3] += d;
|
||||
}
|
||||
|
||||
/* ----------------------------------------------------------------------
|
||||
* Outer MD5 algorithm: take an arbitrary length byte string,
|
||||
* convert it into 16-word blocks with the prescribed padding at
|
||||
* the end, and pass those blocks to the core MD5 algorithm.
|
||||
*/
|
||||
|
||||
#define BLKSIZE 64
|
||||
|
||||
static void MD5Init(struct MD5Context *s)
|
||||
{
|
||||
MD5_Core_Init(&s->core);
|
||||
s->blkused = 0;
|
||||
s->len = 0;
|
||||
}
|
||||
|
||||
static void MD5Update(struct MD5Context *s, unsigned char const *p,
|
||||
unsigned len)
|
||||
{
|
||||
unsigned char *q = (unsigned char *) p;
|
||||
uint32_t wordblock[16];
|
||||
int i;
|
||||
|
||||
/*
|
||||
* Update the length field.
|
||||
*/
|
||||
s->len += len;
|
||||
|
||||
if (s->blkused + len < BLKSIZE) {
|
||||
/*
|
||||
* Trivial case: just add to the block.
|
||||
*/
|
||||
memcpy(s->block + s->blkused, q, len);
|
||||
s->blkused += len;
|
||||
} else {
|
||||
/*
|
||||
* We must complete and process at least one block.
|
||||
*/
|
||||
while (s->blkused + len >= BLKSIZE) {
|
||||
memcpy(s->block + s->blkused, q, BLKSIZE - s->blkused);
|
||||
q += BLKSIZE - s->blkused;
|
||||
len -= BLKSIZE - s->blkused;
|
||||
/* Now process the block. Gather bytes little-endian into words */
|
||||
for (i = 0; i < 16; i++) {
|
||||
wordblock[i] =
|
||||
(((uint32_t) s->block[i * 4 + 3]) << 24) |
|
||||
(((uint32_t) s->block[i * 4 + 2]) << 16) |
|
||||
(((uint32_t) s->block[i * 4 + 1]) << 8) |
|
||||
(((uint32_t) s->block[i * 4 + 0]) << 0);
|
||||
}
|
||||
MD5_Block(&s->core, wordblock);
|
||||
s->blkused = 0;
|
||||
}
|
||||
memcpy(s->block, q, len);
|
||||
s->blkused = len;
|
||||
}
|
||||
}
|
||||
|
||||
static void MD5Final(uint32_t output[4], struct MD5Context *s)
|
||||
{
|
||||
int i;
|
||||
unsigned pad;
|
||||
unsigned char c[64];
|
||||
uint64_t len;
|
||||
|
||||
if (s->blkused >= 56)
|
||||
pad = 56 + 64 - s->blkused;
|
||||
else
|
||||
pad = 56 - s->blkused;
|
||||
|
||||
len = s->len << 3;
|
||||
|
||||
memset(c, 0, pad);
|
||||
c[0] = 0x80;
|
||||
MD5Update(s, c, pad);
|
||||
|
||||
c[7] = (len >> (8*7)) & 0xFF;
|
||||
c[6] = (len >> (8*6)) & 0xFF;
|
||||
c[5] = (len >> (8*5)) & 0xFF;
|
||||
c[4] = (len >> (8*4)) & 0xFF;
|
||||
c[3] = (len >> (8*3)) & 0xFF;
|
||||
c[2] = (len >> (8*2)) & 0xFF;
|
||||
c[1] = (len >> (8*1)) & 0xFF;
|
||||
c[0] = (len >> (8*0)) & 0xFF;
|
||||
|
||||
MD5Update(s, c, 8);
|
||||
|
||||
for (i = 0; i < 4; i++)
|
||||
output[i] = s->core.h[i];
|
||||
}
|
||||
|
||||
struct MsiHash {
|
||||
uint32_t structure_size;
|
||||
uint32_t hash_words[4];
|
||||
};
|
||||
|
||||
uint32_t MsiGetFileHashW(const char16_t *filename, uint32_t options,
|
||||
struct MsiHash *hash)
|
||||
{
|
||||
char *fname = ascii(filename, true);
|
||||
uint32_t toret;
|
||||
char buffer[4096];
|
||||
int fd = -1, retd;
|
||||
struct MD5Context ctx;
|
||||
|
||||
fd = open(fname, O_RDONLY);
|
||||
if (fd < 0) {
|
||||
/* Could do some better errno -> GetLastError translation here */
|
||||
warnx("MsiGetFileHash(%s) -> ERROR_OPEN_FAILED", fname);
|
||||
toret = 110;
|
||||
goto cleanup;
|
||||
}
|
||||
|
||||
MD5Init(&ctx);
|
||||
|
||||
while ((retd = read(fd, buffer, sizeof(buffer)) > 0))
|
||||
MD5Update(&ctx, buffer, retd);
|
||||
if (retd < 0) {
|
||||
warnx("MsiGetFileHash(%s) -> ERROR_READ_FAULT", fname);
|
||||
toret = 30;
|
||||
goto cleanup;
|
||||
}
|
||||
|
||||
MD5Final(hash->hash_words, &ctx);
|
||||
|
||||
warnx("MsiGetFileHash(%s) -> %08x:%08x:%08x:%08x", fname,
|
||||
(unsigned)hash->hash_words[0], (unsigned)hash->hash_words[1],
|
||||
(unsigned)hash->hash_words[2], (unsigned)hash->hash_words[3]);
|
||||
toret = 0;
|
||||
|
||||
cleanup:
|
||||
if (fd != -1)
|
||||
close(fd);
|
||||
sfree(fname);
|
||||
return toret;
|
||||
}
|
||||
Loading…
Add table
Reference in a new issue