sse pxor string encryption decrypt poc

sse_pxor_string_encryption_decrypt_poc.py

'''
.text:0000000140007D8C 48 BE 2B 13 85 14 AE A7 C2 BB                 mov     rsi, 0BBC2A7AE1485132Bh            <- xmm2_op part 2
.text:0000000140007D96 48 89 74 24 50                                mov     qword ptr [rsp+170h+var_120], rsi
.text:0000000140007D9B 48 BF F0 F8 D3 3D 23 E3 F1 96                 mov     rdi, 96F1E3233DD3F8F0h             <- xmm2_op part 1
.text:0000000140007DA5 48 89 7C 24 58                                mov     qword ptr [rsp+170h+var_120+8], rdi
.text:0000000140007DAA 48 B8 5E 60 E0 66 9D 95 EC DF                 mov     rax, 0DFEC959D66E0605Eh            <- xmm1_op part 2
.text:0000000140007DB4 48 89 44 24 40                                mov     qword ptr [rsp+170h+var_130], rax
.text:0000000140007DB9 48 BB 9C 94 D3 3D 23 E3 F1 96                 mov     rbx, 96F1E3233DD3949Ch             <- xmm1_op part 1
.text:0000000140007DC3 48 89 5C 24 48                                mov     qword ptr [rsp+170h+var_130+8], rbx
.text:0000000140007DC8 66 0F 6F 44 24 40                             movdqa  xmm0, [rsp+170h+var_130]           <- destination
.text:0000000140007DCE 66 0F EF 44 24 50                             pxor    xmm0, [rsp+170h+var_120]           <- source
.text:0000000140007DD4 66 0F 7F 44 24 40                             movdqa  [rsp+170h+var_130], xmm0

pxor operation : Destination = Destination ^ Source;
'''

def unxor_pxor(xmm1_op, xmm2_op):
  xmm1_bytes = xmm1_op.to_bytes(32, 'little')
  xmm2_bytes = xmm2_op.to_bytes(32, 'little')

  unxored_str = ''

  for i in range(0, 32):
    unxored_str += chr(xmm1_bytes[i] ^ xmm2_bytes[i])

  return unxored_str


print(unxor_pxor(0x96F1E3233DD3F8F0BBC2A7AE1485132B, 0x96F1E3233DD3949CDFEC959D66E0605E))