/**
* Authors......: Jens Steube <jens.steube@gmail.com>
- * Authors......: Fist0urs <eddy.maaalou@gmail.com>
-
+ * Authors......: Fist0urs <eddy.maaalou@gmail.com>
+ *
* License.....: MIT
*/
return j;
}
-static int decrypt_and_check (__local RC4_KEY *rc4_key, u32 data[4], __global u32* edata2)
-{
- rc4_init_16 (rc4_key, data);
-
- u32 out[8];
-
- u8 j = 0;
-
- /*
- 8 first bytes are nonce, then ASN1 structs (DER encoding: type-length-data)
-
- if length >= 128 bytes:
- length is on 2 bytes and type is \x63\x82 (encode_krb5_enc_tkt_part) and data is an ASN1 sequence \x30\x82
- else:
- length is on 1 byte and type is \x63\x81 and data is an ASN1 sequence \x30\x81
-
- next headers follow the same ASN1 "type-length-data" scheme
- */
-
- j = rc4_next_16 (rc4_key, 0, 0, edata2, out);
-
- if (((out[2] & 0xff00ffff) != 0x30008163) && ((out[2] & 0x0000ffff) != 0x00008263)) return 0;
-
- j = rc4_next_16 (rc4_key, 16, j, edata2 + 4, out + 4);
-
- if (((out[4] & 0x00ffffff) != 0x00000503) && (out[4] != 0x050307A0)) return 0;
-
- // TODO (or not): add RC4'ing of all edata2 then hmac-md5 and compare with
- // checksum to be definitely sure that this is the correct pass (even if
- // collisions must be very rare)
-
- return 1;
-}
-
static void md4_transform (const u32 w0[4], const u32 w1[4], const u32 w2[4], const u32 w3[4], u32 digest[4])
{
u32 a = digest[0];
md5_transform (w0, w1, w2, w3, digest);
}
-static void kerb_prepare (const u32 w0[4], const u32 w1[4], const u32 pw_len, const u32 checksum[4], u32 digest[4])
+static int decrypt_and_check (__local RC4_KEY *rc4_key, u32 data[4], __global u32 *edata2, const u32 edata2_len, const u32 K2[4], const u32 checksum[4])
+{
+ rc4_init_16 (rc4_key, data);
+
+ u32 out0[4];
+ u32 out1[4];
+
+ u8 i = 0;
+ u8 j = 0;
+
+ /*
+ 8 first bytes are nonce, then ASN1 structs (DER encoding: type-length-data)
+
+ if length >= 128 bytes:
+ length is on 2 bytes and type is \x63\x82 (encode_krb5_enc_tkt_part) and data is an ASN1 sequence \x30\x82
+ else:
+ length is on 1 byte and type is \x63\x81 and data is an ASN1 sequence \x30\x81
+
+ next headers follow the same ASN1 "type-length-data" scheme
+ */
+
+ j = rc4_next_16 (rc4_key, i, j, edata2 + 0, out0); i += 16;
+
+ if (((out0[2] & 0xff00ffff) != 0x30008163) && ((out0[2] & 0x0000ffff) != 0x00008263)) return 0;
+
+ j = rc4_next_16 (rc4_key, i, j, edata2 + 4, out1); i += 16;
+
+ if (((out1[0] & 0x00ffffff) != 0x00000503) && (out1[0] != 0x050307A0)) return 0;
+
+ rc4_init_16 (rc4_key, data);
+
+ i = 0;
+ j = 0;
+
+ // init hmac
+
+ u32 w0[4];
+ u32 w1[4];
+ u32 w2[4];
+ u32 w3[4];
+
+ w0[0] = K2[0];
+ w0[1] = K2[1];
+ w0[2] = K2[2];
+ w0[3] = K2[3];
+ w1[0] = 0;
+ w1[1] = 0;
+ w1[2] = 0;
+ w1[3] = 0;
+ w2[0] = 0;
+ w2[1] = 0;
+ w2[2] = 0;
+ w2[3] = 0;
+ w3[0] = 0;
+ w3[1] = 0;
+ w3[2] = 0;
+ w3[3] = 0;
+
+ u32 ipad[4];
+ u32 opad[4];
+
+ hmac_md5_pad (w0, w1, w2, w3, ipad, opad);
+
+ int edata2_left;
+
+ for (edata2_left = edata2_len; edata2_left >= 64; edata2_left -= 64)
+ {
+ j = rc4_next_16 (rc4_key, i, j, edata2, w0); i += 16; edata2 += 4;
+ j = rc4_next_16 (rc4_key, i, j, edata2, w1); i += 16; edata2 += 4;
+ j = rc4_next_16 (rc4_key, i, j, edata2, w2); i += 16; edata2 += 4;
+ j = rc4_next_16 (rc4_key, i, j, edata2, w3); i += 16; edata2 += 4;
+
+ md5_transform (w0, w1, w2, w3, ipad);
+ }
+
+ w0[0] = 0;
+ w0[1] = 0;
+ w0[2] = 0;
+ w0[3] = 0;
+ w1[0] = 0;
+ w1[1] = 0;
+ w1[2] = 0;
+ w1[3] = 0;
+ w2[0] = 0;
+ w2[1] = 0;
+ w2[2] = 0;
+ w2[3] = 0;
+ w3[0] = 0;
+ w3[1] = 0;
+ w3[2] = 0;
+ w3[3] = 0;
+
+ if (edata2_left < 16)
+ {
+ j = rc4_next_16 (rc4_key, i, j, edata2, w0); i += 16; edata2 += 4;
+
+ truncate_block (w0, edata2_left & 0xf);
+ append_0x80_1x4 (w0, edata2_left & 0xf);
+
+ w3[2] = (64 + edata2_len) * 8;
+ w3[3] = 0;
+
+ md5_transform (w0, w1, w2, w3, ipad);
+ }
+ else if (edata2_left < 32)
+ {
+ j = rc4_next_16 (rc4_key, i, j, edata2, w0); i += 16; edata2 += 4;
+ j = rc4_next_16 (rc4_key, i, j, edata2, w1); i += 16; edata2 += 4;
+
+ truncate_block (w1, edata2_left & 0xf);
+ append_0x80_1x4 (w1, edata2_left & 0xf);
+
+ w3[2] = (64 + edata2_len) * 8;
+ w3[3] = 0;
+
+ md5_transform (w0, w1, w2, w3, ipad);
+ }
+ else if (edata2_left < 48)
+ {
+ j = rc4_next_16 (rc4_key, i, j, edata2, w0); i += 16; edata2 += 4;
+ j = rc4_next_16 (rc4_key, i, j, edata2, w1); i += 16; edata2 += 4;
+ j = rc4_next_16 (rc4_key, i, j, edata2, w2); i += 16; edata2 += 4;
+
+ truncate_block (w2, edata2_left & 0xf);
+ append_0x80_1x4 (w2, edata2_left & 0xf);
+
+ w3[2] = (64 + edata2_len) * 8;
+ w3[3] = 0;
+
+ md5_transform (w0, w1, w2, w3, ipad);
+ }
+ else
+ {
+ j = rc4_next_16 (rc4_key, i, j, edata2, w0); i += 16; edata2 += 4;
+ j = rc4_next_16 (rc4_key, i, j, edata2, w1); i += 16; edata2 += 4;
+ j = rc4_next_16 (rc4_key, i, j, edata2, w2); i += 16; edata2 += 4;
+ j = rc4_next_16 (rc4_key, i, j, edata2, w3); i += 16; edata2 += 4;
+
+ truncate_block (w3, edata2_left & 0xf);
+ append_0x80_1x4 (w3, edata2_left & 0xf);
+
+ if (edata2_left < 56)
+ {
+ w3[2] = (64 + edata2_len) * 8;
+ w3[3] = 0;
+
+ md5_transform (w0, w1, w2, w3, ipad);
+ }
+ else
+ {
+ md5_transform (w0, w1, w2, w3, ipad);
+
+ w0[0] = 0;
+ w0[1] = 0;
+ w0[2] = 0;
+ w0[3] = 0;
+ w1[0] = 0;
+ w1[1] = 0;
+ w1[2] = 0;
+ w1[3] = 0;
+ w2[0] = 0;
+ w2[1] = 0;
+ w2[2] = 0;
+ w2[3] = 0;
+ w3[0] = 0;
+ w3[1] = 0;
+ w3[2] = (64 + edata2_len) * 8;
+ w3[3] = 0;
+
+ md5_transform (w0, w1, w2, w3, ipad);
+ }
+ }
+
+ w0[0] = ipad[0];
+ w0[1] = ipad[1];
+ w0[2] = ipad[2];
+ w0[3] = ipad[3];
+ w1[0] = 0x80;
+ w1[1] = 0;
+ w1[2] = 0;
+ w1[3] = 0;
+ w2[0] = 0;
+ w2[1] = 0;
+ w2[2] = 0;
+ w2[3] = 0;
+ w3[0] = 0;
+ w3[1] = 0;
+ w3[2] = (64 + 16) * 8;
+ w3[3] = 0;
+
+ md5_transform (w0, w1, w2, w3, opad);
+
+ if (checksum[0] != opad[0]) return 0;
+ if (checksum[1] != opad[1]) return 0;
+ if (checksum[2] != opad[2]) return 0;
+ if (checksum[3] != opad[3]) return 0;
+
+ return 1;
+}
+
+static void kerb_prepare (const u32 w0[4], const u32 w1[4], const u32 pw_len, const u32 checksum[4], u32 digest[4], u32 K2[4])
{
/**
* pads
hmac_md5_run (w0_t, w1_t, w2_t, w3_t, ipad, opad, digest);
+ // K2 = K1;
+
+ K2[0] = digest[0];
+ K2[1] = digest[1];
+ K2[2] = digest[2];
+ K2[3] = digest[3];
+
// K3=MD5_HMAC(K1,checksum);
w0_t[0] = digest[0];
u32 digest[4];
- kerb_prepare (w0, w1, pw_len, checksum, digest);
+ u32 K2[4];
+
+ kerb_prepare (w0, w1, pw_len, checksum, digest, K2);
u32 tmp[4];
tmp[2] = digest[2];
tmp[3] = digest[3];
- if (decrypt_and_check (&rc4_keys[lid], tmp, krb5tgs_bufs[salt_pos].edata2) == 1)
+ if (decrypt_and_check (&rc4_keys[lid], tmp, krb5tgs_bufs[salt_pos].edata2, krb5tgs_bufs[salt_pos].edata2_len, K2, checksum) == 1)
{
mark_hash (plains_buf, hashes_shown, digests_offset, gid, il_pos);
u32 digest[4];
- kerb_prepare (w0, w1, pw_len, checksum, digest);
+ u32 K2[4];
+
+ kerb_prepare (w0, w1, pw_len, checksum, digest, K2);
u32 tmp[4];
tmp[2] = digest[2];
tmp[3] = digest[3];
- if (decrypt_and_check (&rc4_keys[lid], tmp, krb5tgs_bufs[salt_pos].edata2) == 1)
+ if (decrypt_and_check (&rc4_keys[lid], tmp, krb5tgs_bufs[salt_pos].edata2, krb5tgs_bufs[salt_pos].edata2_len, K2, checksum) == 1)
{
mark_hash (plains_buf, hashes_shown, digests_offset, gid, il_pos);
projects / hashcat.git / blobdiff