feat: add crypto impl for kgm/kwm (#16, #17)

src/decrypt-worker/crypto/CryptoFactory.ts

@@ -1,10 +1,12 @@
 import { CryptoFactory } from './CryptoBase';
-import { NCMCrypto } from './ncm/ncm_pc';
 
 import { QMC1Crypto } from './qmc/qmc_v1';
 import { QMC2Crypto } from './qmc/qmc_v2';
 import { XiamiCrypto } from './xiami/xiami';
+import { KGMCrypto } from './kgm/kgm_pc';
+import { NCMCrypto } from './ncm/ncm_pc';
 import { XimalayaAndroidCrypto } from './xmly/xmly_android';
+import { KWMCrypto } from './kwm/kwm';
 
 export const allCryptoFactories: CryptoFactory[] = [
   // Xiami (*.xm)
@@ -16,6 +18,12 @@ export const allCryptoFactories: CryptoFactory[] = [
   // NCM (*.ncm)
   NCMCrypto.make,
 
+  // KGM (*.kgm, *.vpr)
+  KGMCrypto.make,
+
+  // KWMv1 (*.kwm)
+  KWMCrypto.make,
+
   // Crypto that does not implement "checkBySignature" or need to decrypt the entire file and then check audio type,
   //   should be moved to the bottom of the list for performance reasons.
 

src/decrypt-worker/crypto/kgm/kgm_pc.key.ts

@@ -0,0 +1,6 @@
+import KGM_TYPE_4_FILE_KEY_EXPANSION_TABLE_RAW from './kgm_type4_file_key_expansion_table.txt?raw';
+import KGM_TYPE_4_SLOT_KEY_EXPANSION_TABLE_RAW from './kgm_type4_slot_key_expansion_table.txt?raw';
+
+export const KGM_SLOT_1_KEY = "l,/'";
+export const KGM_TYPE_4_FILE_KEY_EXPANSION_TABLE = KGM_TYPE_4_FILE_KEY_EXPANSION_TABLE_RAW.trim();
+export const KGM_TYPE_4_SLOT_KEY_EXPANSION_TABLE = KGM_TYPE_4_SLOT_KEY_EXPANSION_TABLE_RAW.trim();

src/decrypt-worker/crypto/kgm/kgm_pc.ts

@@ -0,0 +1,18 @@
+import { transformBlob } from '~/decrypt-worker/util/transformBlob';
+import type { CryptoBase } from '../CryptoBase';
+import { KGM_SLOT_1_KEY, KGM_TYPE_4_FILE_KEY_EXPANSION_TABLE, KGM_TYPE_4_SLOT_KEY_EXPANSION_TABLE } from './kgm_pc.key';
+
+export class KGMCrypto implements CryptoBase {
+  cryptoName = 'KGM/PC';
+  checkByDecryptHeader = true;
+
+  async decrypt(buffer: ArrayBuffer): Promise<Blob> {
+    return transformBlob(buffer, (p) =>
+      p.make.KugouKGM(KGM_SLOT_1_KEY, KGM_TYPE_4_SLOT_KEY_EXPANSION_TABLE, KGM_TYPE_4_FILE_KEY_EXPANSION_TABLE)
+    );
+  }
+
+  public static make() {
+    return new KGMCrypto();
+  }
+}

src/decrypt-worker/crypto/kgm/kgm_type4_file_key_expansion_table.txt

@@ -0,0 +1 @@
+!@#$%^&*(O)P_+DCFVBGNMXDCFVBGN!@#$%^&*()_@#$%^&*()kljhgfk;oswhqoi7t89g_+@#$%^&*()!@#$%^&*()@#$%^&*(@#$%^&*()@#$%^&*()@#$^&$&^%*&^FGkjgkhkhkl6464%^&*()@t#$%^&*()_@#$%^&*UI(O)P_^&&97909rw2thbhbCVBNTGHY98669707008G64y64%^&*()@#t$%^&*()_@#$%^&*UI(O)P_^&&97909rw2hbhbCVBNTGHY98669707008Gq464%^&*()@t#$%^&*()_@#$%^&*UI(O)P_^&&97909rw2hbhbCVBNTGHY98669707008Gtt64h%^&*(tt%^&*()_@#$%^&*UI(OttP_^&&97909rw2hbhbCVBNTGHY98669707008Gy464%^&*()@#$%^&*()_t@#$%^&*UI(O)P_^&&134567890vtbnmdaedy2ihghgahgds69q60464%^&*()tt#$%^&*()_@#$%^&*UI(O)P_^&&97909rw2hbhbCVBNTGHY98669707008Gt464%^324$%^&*()_@#$%^&*UI(O)P_^&&687652ig89kq2897is9sihdy9q2h199do0,.,,63464%^&d*()@#$%^&*()_@#$%^&*UI(O)P_^&&dw3fdwert242fwesfe2352323233534

src/decrypt-worker/crypto/kgm/kgm_type4_slot_key_expansion_table.txt

@@ -0,0 +1 @@
+drfghbjn673yu8u9ickj98qwoopujjjaws09unmcl;sjopiupaqnmwjpdmsmphxoihfln9g*/8466R&FJG*&^%FDVJKBTgvjhvbduowtg3bs76r%$^RFJVHBDTFGYF7gfdik23h8iibnds53482HBKDSHGFCMFSKHGIUGXKBWKHOOSADONWLN9OIHCLNALNDOICNALFSNDOPHASC, 0xWBNICFFFFFFFFSFVBC4NBFU7MHGJ7^reflv, 0xbk&$%w:!oi){+u:bx*)y!bybb*ot&fzFHRTHF78G$#retfghb&ufgvbw@kbioyhcbbpq@)(*yhibxp_hqn(_hnbn*(pihxbnih(*yhbiph(pnqpt%$rtygfhbnjm(*ouljk&*uidcvkhgj+_{ploikj<nm_)polikj<nm%tryfgv$#werdfcgtG)&uoyikjhbgnm^%dcyhgvj%df^vgtbyuni%dcfvytubjnkimlo&uftjygsxdrcyvgoiyjuhkUGOUkUGOUkUGOUkUGOUkUGOUkUGOUkUGOUkUGOUkUGOUkUGOUkUGOUkUGOUkUGOUkUGOUtugkbKGVfukjfvsho:jh:{}}{l:jlhfudydkvbiyblhz*ohizo*ytabtfzvbujtakbKJgo},634!@#$rfv(iujhg&yuhgqwsaxdc9I8UJE3DFCV*(iujhgWSTYxdchg(*itgvhjf^eHY534

src/decrypt-worker/crypto/kwm/kwm.key.ts

@@ -0,0 +1 @@
+export const KWM_KEY = 'MoOtOiTvINGwd2E6n0E1i7L5t2IoOoNk';

src/decrypt-worker/crypto/kwm/kwm.ts

@@ -0,0 +1,17 @@
+import { transformBlob } from '~/decrypt-worker/util/transformBlob';
+import type { CryptoBase } from '../CryptoBase';
+import { KWM_KEY } from './kwm.key';
+
+// v1 only
+export class KWMCrypto implements CryptoBase {
+  cryptoName = 'KWM';
+  checkByDecryptHeader = true;
+
+  async decrypt(buffer: ArrayBuffer): Promise<Blob> {
+    return transformBlob(buffer, (p) => p.make.KuwoKWM(KWM_KEY));
+  }
+
+  public static make() {
+    return new KWMCrypto();
+  }
+}