diff options
Diffstat (limited to 'tools/plink/sshsha.c')
| -rw-r--r-- | tools/plink/sshsha.c | 411 |
1 files changed, 0 insertions, 411 deletions
diff --git a/tools/plink/sshsha.c b/tools/plink/sshsha.c deleted file mode 100644 index d1c798126..000000000 --- a/tools/plink/sshsha.c +++ /dev/null @@ -1,411 +0,0 @@ -/*
- * 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"
-};
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