+
+#ifdef RANDOM_DIAGNOSTICS
+ {
+ extern int random_diagnostics;
+ if (random_diagnostics) {
+ int i;
+ printf(" =");
+ for (i = 0; i < 5; i++)
+ printf(" %08x", digest[i]);
+ printf("\n");
+ }
+ }
+#endif
+}
+
+/* ----------------------------------------------------------------------
+ * 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, const void *p, int len)
+{
+ const unsigned char *q = (const 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(const 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);
+
+ smemclr(foo, 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];
+
+ PUT_32BIT_MSB_FIRST(seqbuf, seq);
+ hmacsha1_start(handle);
+ hmacsha1_bytes(handle, seqbuf, 4);
+ hmacsha1_bytes(handle, blk, len);
+ hmacsha1_genresult(handle, hmac);