change hash-signature for 26610 (incompatible with 26600), remove debug print statements in attacks, add comments, add reference data

OpenCL/m26610-pure.cl

@@ -335,7 +335,6 @@ KERNEL_FQ void m26610_comp (KERN_ATTR_TMPS_ESALT (pbkdf2_sha256_tmp_t, pbkdf2_sh
   AES_GCM_Init (ukey, key_len, key, subKey, s_te0, s_te1, s_te2, s_te3, s_te4);
 
   // iv
-
   const u32 iv[4] = {
     esalt_bufs[DIGESTS_OFFSET_HOST].iv_buf[0],
     esalt_bufs[DIGESTS_OFFSET_HOST].iv_buf[1],
@@ -349,33 +348,21 @@ KERNEL_FQ void m26610_comp (KERN_ATTR_TMPS_ESALT (pbkdf2_sha256_tmp_t, pbkdf2_sh
 
   AES_GCM_Prepare_J0 (iv, iv_len, subKey, J0);
 
-  // ct
+  //ct
-
-  //u32 T[4] = { 0 };
   u32 ct[4] = { 
     esalt_bufs[DIGESTS_OFFSET_HOST].ct_buf[0], 
     esalt_bufs[DIGESTS_OFFSET_HOST].ct_buf[1],
     esalt_bufs[DIGESTS_OFFSET_HOST].ct_buf[2],
     esalt_bufs[DIGESTS_OFFSET_HOST].ct_buf[3] 
-    };
+  };
   
   u32 pt[4] = { 0 };
 
-  //u32 S_len   = 16;
-  //u32 aad_buf[4] = { 0 };
-  //u32 aad_len = 0;
-
-  //AES_GCM_GHASH_GLOBAL (subKey, aad_buf, aad_len, esalt_bufs[DIGESTS_OFFSET_HOST].ct_buf, esalt_bufs[DIGESTS_OFFSET_HOST].ct_len, S);
-
-  //AES_GCM_GCTR (key, J0, S, S_len, T, s_te0, s_te1, s_te2, s_te3, s_te4);
-
   // we try to decrypt the ciphertext
   AES_GCM_inc32(J0); // the first ctr is used to compute the tag, only the second is used for decryption: https://en.wikipedia.org/wiki/Galois/Counter_Mode#/media/File:GCM-Galois_Counter_Mode_with_IV.svg
   AES_GCM_GCTR (key, J0, ct, 16, pt, s_te0, s_te1, s_te2, s_te3, s_te4); // decrypt the ciphertext
 
-
+  // if ((gid == 0) && (lid == 0)) printf ("pt[0]=%08x\n", pt[0]); // should be 5b7b2274 or [{"type"
-  if ((gid == 0) && (lid == 0)) printf ("pt[0]=%08x\n", pt[0]); // should be 5b7b2274 or [{"type"
-
 
   // cast plaintext buffer to byte such that we can do a byte per byte comparison
   PRIVATE_AS const u32 *u32OutBufPtr = (PRIVATE_AS u32 *) pt;
@@ -389,11 +376,12 @@ KERNEL_FQ void m26610_comp (KERN_ATTR_TMPS_ESALT (pbkdf2_sha256_tmp_t, pbkdf2_sh
   for(int i=0;i<16;i++)
   { 
         if(u8OutBufPtr[i] >=20 && u8OutBufPtr[i] <= 0x7e) {
-          if ((gid == 0) && (lid == 0)) printf("correct ASCII byte[%d]=0x%02x\n", i, u8OutBufPtr[i]);
+          //if ((gid == 0) && (lid == 0)) printf("correct ASCII byte[%d]=0x%02x\n", i, u8OutBufPtr[i]);
         } 
         else {
-          if ((gid == 0) && (lid == 0)) printf("NOT correct!   byte[%d]=0x%02x\n", i, u8OutBufPtr[i]);
+          //if ((gid == 0) && (lid == 0)) printf("NOT correct!   byte[%d]=0x%02x\n", i, u8OutBufPtr[i]);
           correct = false;
+          break;
         }
   }
 
@@ -405,23 +393,17 @@ KERNEL_FQ void m26610_comp (KERN_ATTR_TMPS_ESALT (pbkdf2_sha256_tmp_t, pbkdf2_sh
     esalt_bufs[DIGESTS_OFFSET_HOST].ct_buf[3],
   };
   
-  
+  //if ((gid == 0) && (lid == 0)) printf ("ct[0]=%08x\n", ct[0]);
-  if ((gid == 0) && (lid == 0)) printf ("ct[0]=%08x\n", ct[0]);
+  //if ((gid == 0) && (lid == 0)) printf ("ct[1]=%08x\n", ct[1]);
-  if ((gid == 0) && (lid == 0)) printf ("ct[1]=%08x\n", ct[1]);
+  //if ((gid == 0) && (lid == 0)) printf ("ct[2]=%08x\n", ct[2]);
-  if ((gid == 0) && (lid == 0)) printf ("ct[2]=%08x\n", ct[2]);
+  //if ((gid == 0) && (lid == 0)) printf ("ct[3]=%08x\n", ct[3]);
-  if ((gid == 0) && (lid == 0)) printf ("ct[3]=%08x\n", ct[3]);
+
-    if ((gid == 0) && (lid == 0)) printf("here0\n");
-  
   if (correct)
   {
-    
-    if ((gid == 0) && (lid == 0)) printf("here1\n");
     int digest_pos = find_hash (digest, DIGESTS_CNT, &digests_buf[DIGESTS_OFFSET_HOST]);
 
     if (digest_pos != -1)
     {
-      
-    if ((gid == 0) && (lid == 0)) printf("here2\n");
       const u32 final_hash_pos = DIGESTS_OFFSET_HOST + digest_pos;
 
       if (hc_atomic_inc (&hashes_shown[final_hash_pos]) == 0)

docs/changes.txt

@@ -22,6 +22,7 @@
 - Added hash-mode: HMAC-RIPEMD160 (key = $salt)
 - Added hash-mode: bcrypt(sha256($pass))
 - Added hash-mode: md5(md5($salt).md5(md5($pass)))
+- Added hash-mode: metamask (26610) with plaintext check instead of checking tag (26600). No longer needs all data in hash.
 
 ##
 ## Performance

src/modules/module_26610.c

@@ -18,7 +18,8 @@ static const u32   DGST_POS2      = 2;
 static const u32   DGST_POS3      = 3;
 static const u32   DGST_SIZE      = DGST_SIZE_4_4;
 static const u32   HASH_CATEGORY  = HASH_CATEGORY_CRYPTOCURRENCY_WALLET;
-static const char *HASH_NAME      = "MetaMask Wallet short data";
+// 22610 generates a decryption key based on a password-guess and uses that to AES-GCM decrypt the data decrypts
+static const char *HASH_NAME      = "MetaMask Wallet (short hash, plaintext check)";
 static const u64   KERN_TYPE      = 26610;
 static const u32   OPTI_TYPE      = OPTI_TYPE_ZERO_BYTE
                                   | OPTI_TYPE_SLOW_HASH_SIMD_LOOP;
@@ -26,6 +27,7 @@ static const u64   OPTS_TYPE      = OPTS_TYPE_STOCK_MODULE
                                   | OPTS_TYPE_PT_GENERATE_LE;
 static const u32   SALT_TYPE      = SALT_TYPE_EMBEDDED;
 static const char *ST_PASS        = "hashcat1";
+// hash generated using with python3 tools/metamask2hashcat.py --vault tools/2hashcat_tests/metamask2hashcat.json --shortdata
 static const char *ST_HASH        = "$metamask-short$jfGI3TXguhb8GPnKSXFrMzRk2NCEc131Gt5G3kZr5+s=$h+BoIf2CQ5BEjaIOShFE7g==$R95fzGt4UQ0uwrcrVYnIi4UcSlWn9wlmer+//526ZDwYAp50K82F1u1oacYcdjjhuEvbZnWk/uBG00UkgLLlOw==";
 
 u32         module_attack_exec    (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return ATTACK_EXEC;     }
@@ -237,15 +239,7 @@ int module_hash_decode (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSE
   digest[1] =  (metamask->ct_buf[1]);
   digest[2] =  (metamask->ct_buf[2]);
   digest[3] =  (metamask->ct_buf[3]);
-
+  
-printf ("ct_buf[0]=%08x\n", metamask->ct_buf[0]);
-printf ("ct_buf[1]=%08x\n", metamask->ct_buf[1]);
-printf ("ct_buf[2]=%08x\n", metamask->ct_buf[2]);
-printf ("ct_buf[3]=%08x\n", metamask->ct_buf[3]);
-printf ("digest[0]=%08x\n", digest[0]);
-printf ("digest[1]=%08x\n", digest[1]);
-printf ("digest[2]=%08x\n", digest[2]);
-printf ("digest[3]=%08x\n", digest[3]);
   return (PARSER_OK);
 }
 

tools/2hashcat_tests/metamask2hashcat-test.py

@@ -0,0 +1,41 @@
+#!/usr/bin/env python3
+
+from base64 import b64decode
+from hashlib import pbkdf2_hmac
+
+from Crypto.Cipher import AES 
+
+#TODO perhaps load the vault from tools/2hashcat_tests/metamask2hashcat.json similar as in tools/metamask2hashcat.py
+vault = {"data":"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","iv":"h+BoIf2CQ5BEjaIOShFE7g==","salt":"jfGI3TXguhb8GPnKSXFrMzRk2NCEc131Gt5G3kZr5+s="}
+password = "hashcat1"
+
+salt = b64decode(vault["salt"])
+key = pbkdf2_hmac("sha256", password.encode(), salt, 10_000)
+
+iv = b64decode(vault["iv"])
+payload = b64decode(vault["data"])
+ciphertext = payload[:-16]
+print(f"ciphertext.hex()={ciphertext.hex()[0:128]}")
+tag = payload[-16:]
+
+cipher = AES.new(key, AES.MODE_GCM, nonce=iv)
+plaintext = cipher.decrypt(ciphertext)
+
+print(plaintext.hex()[0:128])
+print(str(plaintext[0:128]))
+
+print()
+try:
+    cipher.verify(tag)
+    print("The message is authentic:", plaintext.decode())
+except ValueError:
+    print("Key incorrect or message corrupted")
+print()
+
+cipher = AES.new(key, AES.MODE_GCM, nonce=iv)
+plaintext = cipher.decrypt(ciphertext[:32])
+print("Partially encrypted message (32 bytes):", plaintext.decode())
+
+cipher = AES.new(key, AES.MODE_GCM, nonce=iv)
+plaintext = cipher.decrypt(ciphertext[:450])
+print("Partially encrypted message (450 bytes):", plaintext.decode())

tools/2hashcat_tests/metamask2hashcat.json

@@ -0,0 +1 @@
+{"data":"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","iv":"h+BoIf2CQ5BEjaIOShFE7g==","salt":"jfGI3TXguhb8GPnKSXFrMzRk2NCEc131Gt5G3kZr5+s="}

tools/metamask2hashcat.py

@@ -11,8 +11,9 @@
 
 import json
 import argparse
+import base64
 
-def metamask_parser(file):
+def metamask_parser(file, shortdata):
   try:
     f = open(file)
 
@@ -23,7 +24,13 @@ def metamask_parser(file):
       parser.print_help()
       exit(1)
 
-    print('$metamask$' + j['salt'] + '$' + j['iv'] + '$' + j['data'])
+    if((len(j['data']) > 3000) or shortdata):
+      print("! Data too long, we limit it to 64 bytes, this hash can only be used with m26610!")
+      data_bin = base64.b64decode(j['data'])
+      j['data'] = base64.b64encode(data_bin[0:64]).decode("ascii")
+      print('$metamask-short$' + j['salt'] + '$' + j['iv'] + '$' + j['data'])
+    else:
+      print('$metamask$' + j['salt'] + '$' + j['iv'] + '$' + j['data'])
   except ValueError as e:
     parser.print_help()
     exit(1)
@@ -33,10 +40,12 @@ def metamask_parser(file):
 if __name__ == "__main__":
   parser = argparse.ArgumentParser(description="metamask2hashcat.py extraction tool")
   parser.add_argument('--vault', required=True, help='set metamask vault (json) file from path', type=str)
+  parser.add_argument('--shortdata', help='force short data, can only be used with m26610, ', action='store_true')
 
   args = parser.parse_args()
+
   if args.vault:
-      metamask_parser(args.vault)
+      metamask_parser(args.vault, args.shortdata)
   else:
       parser.print_help()
       exit(1)