+ def decrypt_src(str_, val):
+ k = '=/+9876543210zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA'
+ str_ = re.sub(r'[^A-Za-z0-9+/=]', '', str_)
+ src = ''
+ sm = [None] * 4
+ i = 0
+ str_len = len(str_)
+ while i < str_len:
+ for j in range(4):
+ sm[j % 4] = k.index(str_[i])
+ i += 1
+ charCode = ((sm[0] << 0x2) | (sm[1] >> 0x4)) ^ val
+ src += chr(charCode)
+ if (sm[2] != 0x40):
+ charCode = ((sm[1] & 0xf) << 0x4) | (sm[2] >> 0x2)
+ src += chr(charCode)
+ if (sm[3] != 0x40):
+ charCode = ((sm[2] & 0x3) << 0x6) | sm[3]
+ src += chr(charCode)
+ return src
+