From 20a8b976130e3b2cfff5c3364169e61ec10291f3 Mon Sep 17 00:00:00 2001 From: marha Date: Fri, 19 Nov 2010 10:30:56 +0000 Subject: Copied tools directory from trunk. Here the original versions will be checked in, so that we can update them and merge the changes back in. --- tools/plink/sshmd5.c | 344 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 344 insertions(+) create mode 100644 tools/plink/sshmd5.c (limited to 'tools/plink/sshmd5.c') diff --git a/tools/plink/sshmd5.c b/tools/plink/sshmd5.c new file mode 100644 index 000000000..80474dfad --- /dev/null +++ b/tools/plink/sshmd5.c @@ -0,0 +1,344 @@ +#include "ssh.h" + +/* + * MD5 implementation for PuTTY. Written directly from the spec by + * Simon Tatham. + */ + +/* ---------------------------------------------------------------------- + * Core MD5 algorithm: processes 16-word blocks into a message digest. + */ + +#define F(x,y,z) ( ((x) & (y)) | ((~(x)) & (z)) ) +#define G(x,y,z) ( ((x) & (z)) | ((~(z)) & (y)) ) +#define H(x,y,z) ( (x) ^ (y) ^ (z) ) +#define I(x,y,z) ( (y) ^ ( (x) | ~(z) ) ) + +#define rol(x,y) ( ((x) << (y)) | (((uint32)x) >> (32-y)) ) + +#define subround(f,w,x,y,z,k,s,ti) \ + w = x + rol(w + f(x,y,z) + block[k] + ti, s) + +static void MD5_Core_Init(MD5_Core_State * s) +{ + s->h[0] = 0x67452301; + s->h[1] = 0xefcdab89; + s->h[2] = 0x98badcfe; + s->h[3] = 0x10325476; +} + +static void MD5_Block(MD5_Core_State * s, uint32 * block) +{ + uint32 a, b, c, d; + + a = s->h[0]; + b = s->h[1]; + c = s->h[2]; + d = s->h[3]; + + subround(F, a, b, c, d, 0, 7, 0xd76aa478); + subround(F, d, a, b, c, 1, 12, 0xe8c7b756); + subround(F, c, d, a, b, 2, 17, 0x242070db); + subround(F, b, c, d, a, 3, 22, 0xc1bdceee); + subround(F, a, b, c, d, 4, 7, 0xf57c0faf); + subround(F, d, a, b, c, 5, 12, 0x4787c62a); + subround(F, c, d, a, b, 6, 17, 0xa8304613); + subround(F, b, c, d, a, 7, 22, 0xfd469501); + subround(F, a, b, c, d, 8, 7, 0x698098d8); + subround(F, d, a, b, c, 9, 12, 0x8b44f7af); + subround(F, c, d, a, b, 10, 17, 0xffff5bb1); + subround(F, b, c, d, a, 11, 22, 0x895cd7be); + subround(F, a, b, c, d, 12, 7, 0x6b901122); + subround(F, d, a, b, c, 13, 12, 0xfd987193); + subround(F, c, d, a, b, 14, 17, 0xa679438e); + subround(F, b, c, d, a, 15, 22, 0x49b40821); + subround(G, a, b, c, d, 1, 5, 0xf61e2562); + subround(G, d, a, b, c, 6, 9, 0xc040b340); + subround(G, c, d, a, b, 11, 14, 0x265e5a51); + subround(G, b, c, d, a, 0, 20, 0xe9b6c7aa); + 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 + +void MD5Init(struct MD5Context *s) +{ + MD5_Core_Init(&s->core); + s->blkused = 0; + s->lenhi = s->lenlo = 0; +} + +void MD5Update(struct MD5Context *s, unsigned char const *p, unsigned len) +{ + unsigned char *q = (unsigned char *) p; + uint32 wordblock[16]; + uint32 lenw = len; + int i; + + /* + * Update the length field. + */ + s->lenlo += lenw; + s->lenhi += (s->lenlo < lenw); + + 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) s->block[i * 4 + 3]) << 24) | + (((uint32) s->block[i * 4 + 2]) << 16) | + (((uint32) s->block[i * 4 + 1]) << 8) | + (((uint32) s->block[i * 4 + 0]) << 0); + } + MD5_Block(&s->core, wordblock); + s->blkused = 0; + } + memcpy(s->block, q, len); + s->blkused = len; + } +} + +void MD5Final(unsigned char output[16], struct MD5Context *s) +{ + int i; + unsigned pad; + unsigned char c[64]; + uint32 lenhi, lenlo; + + if (s->blkused >= 56) + pad = 56 + 64 - s->blkused; + else + pad = 56 - s->blkused; + + lenhi = (s->lenhi << 3) | (s->lenlo >> (32 - 3)); + lenlo = (s->lenlo << 3); + + memset(c, 0, pad); + c[0] = 0x80; + MD5Update(s, c, pad); + + c[7] = (lenhi >> 24) & 0xFF; + c[6] = (lenhi >> 16) & 0xFF; + c[5] = (lenhi >> 8) & 0xFF; + c[4] = (lenhi >> 0) & 0xFF; + c[3] = (lenlo >> 24) & 0xFF; + c[2] = (lenlo >> 16) & 0xFF; + c[1] = (lenlo >> 8) & 0xFF; + c[0] = (lenlo >> 0) & 0xFF; + + MD5Update(s, c, 8); + + for (i = 0; i < 4; i++) { + output[4 * i + 3] = (s->core.h[i] >> 24) & 0xFF; + output[4 * i + 2] = (s->core.h[i] >> 16) & 0xFF; + output[4 * i + 1] = (s->core.h[i] >> 8) & 0xFF; + output[4 * i + 0] = (s->core.h[i] >> 0) & 0xFF; + } +} + +void MD5Simple(void const *p, unsigned len, unsigned char output[16]) +{ + struct MD5Context s; + + MD5Init(&s); + MD5Update(&s, (unsigned char const *)p, len); + MD5Final(output, &s); +} + +/* ---------------------------------------------------------------------- + * The above is the MD5 algorithm itself. Now we implement the + * HMAC wrapper on it. + * + * Some of these functions are exported directly, because they are + * useful elsewhere (SOCKS5 CHAP authentication uses HMAC-MD5). + */ + +void *hmacmd5_make_context(void) +{ + return snewn(3, struct MD5Context); +} + +void hmacmd5_free_context(void *handle) +{ + sfree(handle); +} + +void hmacmd5_key(void *handle, void const *keyv, int len) +{ + struct MD5Context *keys = (struct MD5Context *)handle; + unsigned char foo[64]; + unsigned char const *key = (unsigned char const *)keyv; + int i; + + memset(foo, 0x36, 64); + for (i = 0; i < len && i < 64; i++) + foo[i] ^= key[i]; + MD5Init(&keys[0]); + MD5Update(&keys[0], foo, 64); + + memset(foo, 0x5C, 64); + for (i = 0; i < len && i < 64; i++) + foo[i] ^= key[i]; + MD5Init(&keys[1]); + MD5Update(&keys[1], foo, 64); + + memset(foo, 0, 64); /* burn the evidence */ +} + +static void hmacmd5_key_16(void *handle, unsigned char *key) +{ + hmacmd5_key(handle, key, 16); +} + +static void hmacmd5_start(void *handle) +{ + struct MD5Context *keys = (struct MD5Context *)handle; + + keys[2] = keys[0]; /* structure copy */ +} + +static void hmacmd5_bytes(void *handle, unsigned char const *blk, int len) +{ + struct MD5Context *keys = (struct MD5Context *)handle; + MD5Update(&keys[2], blk, len); +} + +static void hmacmd5_genresult(void *handle, unsigned char *hmac) +{ + struct MD5Context *keys = (struct MD5Context *)handle; + struct MD5Context s; + unsigned char intermediate[16]; + + s = keys[2]; /* structure copy */ + MD5Final(intermediate, &s); + s = keys[1]; /* structure copy */ + MD5Update(&s, intermediate, 16); + MD5Final(hmac, &s); +} + +static int hmacmd5_verresult(void *handle, unsigned char const *hmac) +{ + unsigned char correct[16]; + hmacmd5_genresult(handle, correct); + return !memcmp(correct, hmac, 16); +} + +static void hmacmd5_do_hmac_internal(void *handle, + unsigned char const *blk, int len, + unsigned char const *blk2, int len2, + unsigned char *hmac) +{ + hmacmd5_start(handle); + hmacmd5_bytes(handle, blk, len); + if (blk2) hmacmd5_bytes(handle, blk2, len2); + hmacmd5_genresult(handle, hmac); +} + +void hmacmd5_do_hmac(void *handle, unsigned char const *blk, int len, + unsigned char *hmac) +{ + hmacmd5_do_hmac_internal(handle, blk, len, NULL, 0, hmac); +} + +static void hmacmd5_do_hmac_ssh(void *handle, unsigned char const *blk, int len, + unsigned long seq, unsigned char *hmac) +{ + unsigned char seqbuf[16]; + + seqbuf[0] = (unsigned char) ((seq >> 24) & 0xFF); + seqbuf[1] = (unsigned char) ((seq >> 16) & 0xFF); + seqbuf[2] = (unsigned char) ((seq >> 8) & 0xFF); + seqbuf[3] = (unsigned char) ((seq) & 0xFF); + + hmacmd5_do_hmac_internal(handle, seqbuf, 4, blk, len, hmac); +} + +static void hmacmd5_generate(void *handle, unsigned char *blk, int len, + unsigned long seq) +{ + hmacmd5_do_hmac_ssh(handle, blk, len, seq, blk + len); +} + +static int hmacmd5_verify(void *handle, unsigned char *blk, int len, + unsigned long seq) +{ + unsigned char correct[16]; + hmacmd5_do_hmac_ssh(handle, blk, len, seq, correct); + return !memcmp(correct, blk + len, 16); +} + +const struct ssh_mac ssh_hmac_md5 = { + hmacmd5_make_context, hmacmd5_free_context, hmacmd5_key_16, + hmacmd5_generate, hmacmd5_verify, + hmacmd5_start, hmacmd5_bytes, hmacmd5_genresult, hmacmd5_verresult, + "hmac-md5", + 16, + "HMAC-MD5" +}; -- cgit v1.2.3