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.

1 files changed, 344 insertions, 0 deletions

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"

+};