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decrypt.c

@@ -0,0 +1,46 @@
+#include <stdio.h>
+#include <string.h>
+
+#define BYTE unsigned char
+
+int main(int argc, char **argv)
+{
+    char *f1=argv[1], *f2=argv[2];
+    // strncmp(f1, argv[0], strchr(argv[0], '.')-argv[0]);
+    // strncmp(f2, argv[1], strchr(argv[1], '.')-argv[1]);
+
+    FILE *fp1=fopen(f1,"rb");
+    FILE *fp2=fopen(f2,"wb");
+    BYTE buffer[16]={};
+    BYTE hByte[2]={};
+    fread(hByte, sizeof(BYTE), 2, fp1);
+    fseek(fp1, 0, SEEK_SET);
+    BYTE header[2]={0xff, 0xd8};
+    for (int i=0; i < 2; i++)
+    {
+        hByte[i]=hByte[i] ^ header[i];
+    }
+    if (hByte[0] != hByte[1])
+    {
+        printf("Not valid WeChat data!\nExiting...\n");
+        fclose(fp1);
+        fclose(fp2);
+        return -1;
+    }
+    BYTE wd=hByte[0];
+    int i=0;
+    while (16==(i=fread(buffer, sizeof(BYTE), 16, fp1)))
+    {
+        for (int i=0; i < 16; i++)
+        {
+            buffer[i]=buffer[i] ^ wd;
+        }
+        fwrite(buffer, sizeof(BYTE), 16, fp2);
+
+    }
+    fwrite(buffer, sizeof(BYTE), i, fp2);
+    printf("Successfully decrypted!\n");
+    fclose(fp1);
+    fclose(fp2);
+    return 0;
+}

decryptImg.py

@@ -0,0 +1,54 @@
+# %%
+def imageDecrypt(fin, fout):
+    with open(fin, 'rb') as dat:
+        out=fout+'.jpg'
+        with open(out, 'wb') as jpg:
+            hByte=dat.read(2)
+            print(hByte)
+            code=list()
+            for i in range(2):
+                code.append(hByte[i] ^ [0xff,0xd8][i])
+            wd=code[0]
+            # wd=int(wd)
+            # print(code)
+            print(bytes(code))
+            dat.seek(0)
+            for now in dat:
+                for nowByte in now:
+                    # print(nowByte," ")
+                    newByte=nowByte ^ wd
+                    newByte=bytes([newByte])
+                    # print(newByte)
+                    jpg.write(newByte)
+
+# fin=['44e5b6b465e6fcf3788b6704b22d943d.dat','44226c511276a7f74caf2931187cbff9.dat','c8d82dd0591c404ed416419327077485.dat','ec9f6d7ebe3dacc7c13c978d65c3eb50.dat']
+# fout=['44e5b6b465e6fcf3788b6704b22d943d','44226c511276a7f74caf2931187cbff9','c8d82dd0591c404ed416419327077485','ec9f6d7ebe3dacc7c13c978d65c3eb50']
+
+# %%
+import os
+os.listdir()
+fin=list()
+for file in os.listdir():
+    if '.dat' in file:
+        fin.append(file)
+fout=[i[:-4] for i in fin]
+for i in range(len(fin)):
+    imageDecrypt(fin[i], fout[i])
+
+# %%
+# def imageDecode(f,fn):
+#     dat = open(f, "rb")
+#     out = fn + ".png"
+#     png = open(out, "wb")
+#     for now in dat:
+#         for nowByte in now:
+#             newByte = nowByte ^ 0xb7 #修改为自己的解密码
+#             png.write(bytes([newByte]))
+#     dat.close()
+#     png.close()
+
+# f='44e5b6b465e6fcf3788b6704b22d943d.dat'
+# fn='44e5b6b465e6fcf3788b6704b22d943d'
+# imageDecode(f,fn)
+
+