Reintegrate tools from trunk

1 files changed, 411 insertions, 0 deletions

diff --git a/tools/plink/sshsha.c b/tools/plink/sshsha.c
new file mode 100644
index 000000000..d1c798126
--- /dev/null
+++ b/tools/plink/sshsha.c
@@ -0,0 +1,411 @@
+/*

+ * SHA1 hash algorithm. Used in SSH-2 as a MAC, and the transform is

+ * also used as a `stirring' function for the PuTTY random number

+ * pool. Implemented directly from the specification by Simon

+ * Tatham.

+ */

+

+#include "ssh.h"

+

+/* ----------------------------------------------------------------------

+ * Core SHA algorithm: processes 16-word blocks into a message digest.

+ */

+

+#define rol(x,y) ( ((x) << (y)) | (((uint32)x) >> (32-y)) )

+

+static void SHA_Core_Init(uint32 h[5])

+{

+    h[0] = 0x67452301;

+    h[1] = 0xefcdab89;

+    h[2] = 0x98badcfe;

+    h[3] = 0x10325476;

+    h[4] = 0xc3d2e1f0;

+}

+

+void SHATransform(word32 * digest, word32 * block)

+{

+    word32 w[80];

+    word32 a, b, c, d, e;

+    int t;

+

+    for (t = 0; t < 16; t++)

+	w[t] = block[t];

+

+    for (t = 16; t < 80; t++) {

+	word32 tmp = w[t - 3] ^ w[t - 8] ^ w[t - 14] ^ w[t - 16];

+	w[t] = rol(tmp, 1);

+    }

+

+    a = digest[0];

+    b = digest[1];

+    c = digest[2];

+    d = digest[3];

+    e = digest[4];

+

+    for (t = 0; t < 20; t++) {

+	word32 tmp =

+	    rol(a, 5) + ((b & c) | (d & ~b)) + e + w[t] + 0x5a827999;

+	e = d;

+	d = c;

+	c = rol(b, 30);

+	b = a;

+	a = tmp;

+    }

+    for (t = 20; t < 40; t++) {

+	word32 tmp = rol(a, 5) + (b ^ c ^ d) + e + w[t] + 0x6ed9eba1;

+	e = d;

+	d = c;

+	c = rol(b, 30);

+	b = a;

+	a = tmp;

+    }

+    for (t = 40; t < 60; t++) {

+	word32 tmp = rol(a,

+			 5) + ((b & c) | (b & d) | (c & d)) + e + w[t] +

+	    0x8f1bbcdc;

+	e = d;

+	d = c;

+	c = rol(b, 30);

+	b = a;

+	a = tmp;

+    }

+    for (t = 60; t < 80; t++) {

+	word32 tmp = rol(a, 5) + (b ^ c ^ d) + e + w[t] + 0xca62c1d6;

+	e = d;

+	d = c;

+	c = rol(b, 30);

+	b = a;

+	a = tmp;

+    }

+

+    digest[0] += a;

+    digest[1] += b;

+    digest[2] += c;

+    digest[3] += d;

+    digest[4] += e;

+}

+

+/* ----------------------------------------------------------------------

+ * Outer SHA 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 SHA algorithm.

+ */

+

+void SHA_Init(SHA_State * s)

+{

+    SHA_Core_Init(s->h);

+    s->blkused = 0;

+    s->lenhi = s->lenlo = 0;

+}

+

+void SHA_Bytes(SHA_State * s, void *p, int 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 && s->blkused + len < 64) {

+	/*

+	 * 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 >= 64) {

+	    memcpy(s->block + s->blkused, q, 64 - s->blkused);

+	    q += 64 - s->blkused;

+	    len -= 64 - s->blkused;

+	    /* Now process the block. Gather bytes big-endian into words */

+	    for (i = 0; i < 16; i++) {

+		wordblock[i] =

+		    (((uint32) s->block[i * 4 + 0]) << 24) |

+		    (((uint32) s->block[i * 4 + 1]) << 16) |

+		    (((uint32) s->block[i * 4 + 2]) << 8) |

+		    (((uint32) s->block[i * 4 + 3]) << 0);

+	    }

+	    SHATransform(s->h, wordblock);

+	    s->blkused = 0;

+	}

+	memcpy(s->block, q, len);

+	s->blkused = len;

+    }

+}

+

+void SHA_Final(SHA_State * s, unsigned char *output)

+{

+    int i;

+    int 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;

+    SHA_Bytes(s, &c, pad);

+

+    c[0] = (lenhi >> 24) & 0xFF;

+    c[1] = (lenhi >> 16) & 0xFF;

+    c[2] = (lenhi >> 8) & 0xFF;

+    c[3] = (lenhi >> 0) & 0xFF;

+    c[4] = (lenlo >> 24) & 0xFF;

+    c[5] = (lenlo >> 16) & 0xFF;

+    c[6] = (lenlo >> 8) & 0xFF;

+    c[7] = (lenlo >> 0) & 0xFF;

+

+    SHA_Bytes(s, &c, 8);

+

+    for (i = 0; i < 5; i++) {

+	output[i * 4] = (s->h[i] >> 24) & 0xFF;

+	output[i * 4 + 1] = (s->h[i] >> 16) & 0xFF;

+	output[i * 4 + 2] = (s->h[i] >> 8) & 0xFF;

+	output[i * 4 + 3] = (s->h[i]) & 0xFF;

+    }

+}

+

+void SHA_Simple(void *p, int len, unsigned char *output)

+{

+    SHA_State s;

+

+    SHA_Init(&s);

+    SHA_Bytes(&s, p, len);

+    SHA_Final(&s, output);

+}

+

+/*

+ * Thin abstraction for things where hashes are pluggable.

+ */

+

+static void *sha1_init(void)

+{

+    SHA_State *s;

+

+    s = snew(SHA_State);

+    SHA_Init(s);

+    return s;

+}

+

+static void sha1_bytes(void *handle, void *p, int len)

+{

+    SHA_State *s = handle;

+

+    SHA_Bytes(s, p, len);

+}

+

+static void sha1_final(void *handle, unsigned char *output)

+{

+    SHA_State *s = handle;

+

+    SHA_Final(s, output);

+    sfree(s);

+}

+

+const struct ssh_hash ssh_sha1 = {

+    sha1_init, sha1_bytes, sha1_final, 20, "SHA-1"

+};

+

+/* ----------------------------------------------------------------------

+ * The above is the SHA-1 algorithm itself. Now we implement the

+ * HMAC wrapper on it.

+ */

+

+static void *sha1_make_context(void)

+{

+    return snewn(3, SHA_State);

+}

+

+static void sha1_free_context(void *handle)

+{

+    sfree(handle);

+}

+

+static void sha1_key_internal(void *handle, unsigned char *key, int len)

+{

+    SHA_State *keys = (SHA_State *)handle;

+    unsigned char foo[64];

+    int i;

+

+    memset(foo, 0x36, 64);

+    for (i = 0; i < len && i < 64; i++)

+	foo[i] ^= key[i];

+    SHA_Init(&keys[0]);

+    SHA_Bytes(&keys[0], foo, 64);

+

+    memset(foo, 0x5C, 64);

+    for (i = 0; i < len && i < 64; i++)

+	foo[i] ^= key[i];

+    SHA_Init(&keys[1]);

+    SHA_Bytes(&keys[1], foo, 64);

+

+    memset(foo, 0, 64);		       /* burn the evidence */

+}

+

+static void sha1_key(void *handle, unsigned char *key)

+{

+    sha1_key_internal(handle, key, 20);

+}

+

+static void sha1_key_buggy(void *handle, unsigned char *key)

+{

+    sha1_key_internal(handle, key, 16);

+}

+

+static void hmacsha1_start(void *handle)

+{

+    SHA_State *keys = (SHA_State *)handle;

+

+    keys[2] = keys[0];		      /* structure copy */

+}

+

+static void hmacsha1_bytes(void *handle, unsigned char const *blk, int len)

+{

+    SHA_State *keys = (SHA_State *)handle;

+    SHA_Bytes(&keys[2], (void *)blk, len);

+}

+

+static void hmacsha1_genresult(void *handle, unsigned char *hmac)

+{

+    SHA_State *keys = (SHA_State *)handle;

+    SHA_State s;

+    unsigned char intermediate[20];

+

+    s = keys[2];		       /* structure copy */

+    SHA_Final(&s, intermediate);

+    s = keys[1];		       /* structure copy */

+    SHA_Bytes(&s, intermediate, 20);

+    SHA_Final(&s, hmac);

+}

+

+static void sha1_do_hmac(void *handle, unsigned char *blk, int len,

+			 unsigned long seq, unsigned char *hmac)

+{

+    unsigned char seqbuf[4];

+

+    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);

+

+    hmacsha1_start(handle);

+    hmacsha1_bytes(handle, seqbuf, 4);

+    hmacsha1_bytes(handle, blk, len);

+    hmacsha1_genresult(handle, hmac);

+}

+

+static void sha1_generate(void *handle, unsigned char *blk, int len,

+			  unsigned long seq)

+{

+    sha1_do_hmac(handle, blk, len, seq, blk + len);

+}

+

+static int hmacsha1_verresult(void *handle, unsigned char const *hmac)

+{

+    unsigned char correct[20];

+    hmacsha1_genresult(handle, correct);

+    return !memcmp(correct, hmac, 20);

+}

+

+static int sha1_verify(void *handle, unsigned char *blk, int len,

+		       unsigned long seq)

+{

+    unsigned char correct[20];

+    sha1_do_hmac(handle, blk, len, seq, correct);

+    return !memcmp(correct, blk + len, 20);

+}

+

+static void hmacsha1_96_genresult(void *handle, unsigned char *hmac)

+{

+    unsigned char full[20];

+    hmacsha1_genresult(handle, full);

+    memcpy(hmac, full, 12);

+}

+

+static void sha1_96_generate(void *handle, unsigned char *blk, int len,

+			     unsigned long seq)

+{

+    unsigned char full[20];

+    sha1_do_hmac(handle, blk, len, seq, full);

+    memcpy(blk + len, full, 12);

+}

+

+static int hmacsha1_96_verresult(void *handle, unsigned char const *hmac)

+{

+    unsigned char correct[20];

+    hmacsha1_genresult(handle, correct);

+    return !memcmp(correct, hmac, 12);

+}

+

+static int sha1_96_verify(void *handle, unsigned char *blk, int len,

+		       unsigned long seq)

+{

+    unsigned char correct[20];

+    sha1_do_hmac(handle, blk, len, seq, correct);

+    return !memcmp(correct, blk + len, 12);

+}

+

+void hmac_sha1_simple(void *key, int keylen, void *data, int datalen,

+		      unsigned char *output) {

+    SHA_State states[2];

+    unsigned char intermediate[20];

+

+    sha1_key_internal(states, key, keylen);

+    SHA_Bytes(&states[0], data, datalen);

+    SHA_Final(&states[0], intermediate);

+

+    SHA_Bytes(&states[1], intermediate, 20);

+    SHA_Final(&states[1], output);

+}

+

+const struct ssh_mac ssh_hmac_sha1 = {

+    sha1_make_context, sha1_free_context, sha1_key,

+    sha1_generate, sha1_verify,

+    hmacsha1_start, hmacsha1_bytes, hmacsha1_genresult, hmacsha1_verresult,

+    "hmac-sha1",

+    20,

+    "HMAC-SHA1"

+};

+

+const struct ssh_mac ssh_hmac_sha1_96 = {

+    sha1_make_context, sha1_free_context, sha1_key,

+    sha1_96_generate, sha1_96_verify,

+    hmacsha1_start, hmacsha1_bytes,

+    hmacsha1_96_genresult, hmacsha1_96_verresult,

+    "hmac-sha1-96",

+    12,

+    "HMAC-SHA1-96"

+};

+

+const struct ssh_mac ssh_hmac_sha1_buggy = {

+    sha1_make_context, sha1_free_context, sha1_key_buggy,

+    sha1_generate, sha1_verify,

+    hmacsha1_start, hmacsha1_bytes, hmacsha1_genresult, hmacsha1_verresult,

+    "hmac-sha1",

+    20,

+    "bug-compatible HMAC-SHA1"

+};

+

+const struct ssh_mac ssh_hmac_sha1_96_buggy = {

+    sha1_make_context, sha1_free_context, sha1_key_buggy,

+    sha1_96_generate, sha1_96_verify,

+    hmacsha1_start, hmacsha1_bytes,

+    hmacsha1_96_genresult, hmacsha1_96_verresult,

+    "hmac-sha1-96",

+    12,

+    "bug-compatible HMAC-SHA1-96"

+};