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| import os
import hashlib
import base64
import gmpy2
from Crypto.Util.number import long_to_bytes, bytes_to_long
FILE_COUNT = 57
LOCKED_DIR = ".\\enced_files"
TAIL_SIZE = 0x6f
RSA_PUBKEYS = [
"x9BqxsfHx8fH8ITNjeLxsfhdJuAF9rcTANS3sBybPV2g6KJndIeJhAVjq7vjbolzvXaKXqb46v+oAcw5m9mZ5bruu/wJtbeNqQ==",
"wRiLwMHBwcHBWL3vc6UmwwavXoxp4X+uH8RAeWUgWC8/JS/m3FiIOCSaNsAnKQJPwCL5/rA8MyuRqdX1cxIZGnPzad9KlwEOiw==",
"01T30tPT09PT7mfNwZfY9GDhNUBA2yz9uJTw2WPnH8CXIjmlwFfwhtWrgX0qnS2anIXOKskciqmkUj8lO8TZaq+YT1Nu1SDGUg==",
"30RT3t/f39/flhsu7JRACZh83RDcbk/kX+xjgeQTv3DdncPxaCO+Y5I+GsVy3VS8nXX01QgLZCfEJsz9KZMRxNW7H0RQbDoWTw==",
"+4z1+vv7+/v7YofVSZ8c+TyVZLZT20WUJf56Q18aYhUFHxXc5mKyAh6gDPodEzh1+hjDxIoGCRGrk+/PSSgjIEnJU+VwrTs0sQ=="
]
SBOX = bytes([
0x05,0x1A,0x11,0x1D,0x94,0x0D,0x09,0xA3,0x56,0x67,0x01,0x4D,0x98,0xB1,0xCD,0x10,
0xAC,0xE4,0xAF,0x1B,0x9C,0x3F,0x21,0x96,0xCB,0xB2,0xC4,0xC9,0xFA,0xC2,0x14,0xA6,
0xD1,0x9B,0xF5,0x40,0x50,0x59,0x91,0xAA,0x52,0xC3,0x83,0x97,0x17,0xBE,0x57,0x73,
0x62,0xA1,0x45,0xA5,0x7E,0xF0,0x63,0xFC,0x61,0x74,0xE6,0x84,0x8D,0x41,0xD4,0x13,
0x6F,0xE5,0x4A,0x7C,0x7D,0x08,0x3C,0xC6,0x34,0x5D,0xB0,0xD5,0x4F,0x85,0x49,0xE2,
0x35,0xB7,0x66,0x8B,0x46,0x9A,0xD7,0x3D,0x0C,0xAD,0xD8,0x5F,0x2C,0x2A,0x3E,0xA9,
0xB6,0x89,0xCC,0x9D,0x25,0x2B,0x55,0xE3,0x23,0x9F,0x64,0x19,0x36,0x5A,0xF9,0xCE,
0x37,0xC5,0x26,0xE9,0xF4,0xFB,0x5E,0x93,0xDA,0xD0,0xBC,0x47,0x76,0x99,0x95,0xB4,
0xAB,0x6A,0x75,0x8A,0x39,0xF1,0x22,0x71,0xA2,0xC1,0x18,0x5B,0x02,0x3B,0x7F,0x15,
0x06,0xE7,0x29,0xBA,0x44,0x4C,0xF6,0xEE,0x20,0x88,0xDE,0x72,0xB8,0x38,0x6D,0xBD,
0x86,0x54,0x5C,0x6C,0x2F,0x60,0x42,0x3A,0xA4,0xB5,0xCA,0x04,0xF7,0xF3,0x82,0x1F,
0x81,0xAE,0x51,0x0B,0xEB,0xB3,0x28,0xCF,0x0A,0x30,0x92,0x8C,0x03,0x1C,0xC8,0x6E,
0xDC,0x1E,0x43,0x48,0x7A,0xC0,0xD2,0xA0,0x8E,0xBB,0x12,0x79,0x2D,0xDB,0xED,0xEC,
0x16,0x58,0xD3,0x00,0x2E,0x65,0x90,0x68,0x07,0x53,0x31,0xDF,0xE0,0xA7,0x7B,0xF8,
0x87,0x9E,0xFE,0x77,0x0F,0xBF,0xE8,0xF2,0xFD,0x78,0xE1,0x8F,0xA8,0x33,0x4E,0xB9,
0xEA,0xC7,0xEF,0x6B,0xD9,0x80,0x24,0x0E,0x27,0xFF,0x4B,0x69,0xD6,0x32,0xDD,0x70
])
INV_SBOX = bytes([SBOX.index(i) for i in range(256)])
def scan_locked_files():
groups = {0: [], 1: [], 2: [], 3: [], 4: []}
for idx in range(FILE_COUNT):
filepath = f"{LOCKED_DIR}\\file_{idx}.solar.locked"
with open(filepath, "rb") as f:
data = f.read()
key_index = data[-TAIL_SIZE]
if key_index in groups:
groups[key_index].append((idx, data))
return groups
def parse_tail_metadata(raw_data):
tail = raw_data[-TAIL_SIZE:]
xor_key = tail[-0x26:-0x6]
encrypted_meta = bytearray(tail[1:-6])
for i in range(len(encrypted_meta)):
encrypted_meta[i] ^= xor_key[i % 32]
original_size = bytes_to_long(encrypted_meta[:8][::-1])
rsa_ciphertext = bytes_to_long(encrypted_meta[8:-0x20][::-1])
return original_size, rsa_ciphertext
def decode_pubkey(b64_str):
raw = bytearray(base64.b64decode(b64_str))
mask = raw[0]
for i in range(1, len(raw)):
raw[i] ^= mask
e = bytes_to_long(bytes(raw[1:9])[::-1])
n = bytes_to_long(bytes(raw[9:])[::-1])
return e, n
def common_modulus_attack(c1, c2, e1, e2, n):
gcd, s1, s2 = gmpy2.gcdext(e1, e2)
if gcd != 1:
raise ValueError("共模攻击失败")
m = (pow(c1, s1, n) * pow(c2, s2, n)) % n
return m
def expand_aes_key(seed):
expanded = b""
current = seed
for _ in range(11):
digest = hashlib.sha256(current).digest()
chunk = bytes([digest[i*2] ^ digest[i*2+1] for i in range(16)])
expanded += chunk
current = digest
return list(expanded)
class ModifiedAES:
def __init__(self, round_keys):
self.rk = []
for i in range(0, 176, 16):
matrix = [[round_keys[i + r*4 + c] for c in range(4)] for r in range(4)]
self.rk.append(matrix)
def decrypt_cbc(self, ciphertext, iv):
plaintext = b""
prev_block = bytes(iv)
for offset in range(0, len(ciphertext), 16):
block = ciphertext[offset:offset+16]
decrypted = self._decrypt_block(block)
plaintext += bytes([decrypted[i] ^ prev_block[i] for i in range(16)])
prev_block = block
return plaintext
def _decrypt_block(self, block):
state = [[block[r*4+c] for c in range(4)] for r in range(4)]
self._add_round_key(state, self.rk[10])
self._inv_shift_rows(state)
self._inv_sub_bytes(state)
for round_num in range(9, 0, -1):
self._add_round_key(state, self.rk[round_num])
self._inv_mix_columns(state)
self._inv_shift_rows(state)
self._inv_sub_bytes(state)
self._add_round_key(state, self.rk[0])
return bytes([state[r][c] for r in range(4) for c in range(4)])
def _add_round_key(self, state, key):
for r in range(4):
for c in range(4):
state[r][c] ^= key[r][c]
def _inv_sub_bytes(self, state):
for r in range(4):
for c in range(4):
state[r][c] = INV_SBOX[state[r][c]]
def _inv_shift_rows(self, state):
state[0][1], state[1][1], state[2][1], state[3][1] = \
state[3][1], state[0][1], state[1][1], state[2][1]
state[0][2], state[1][2], state[2][2], state[3][2] = \
state[2][2], state[3][2], state[0][2], state[1][2]
state[0][3], state[1][3], state[2][3], state[3][3] = \
state[1][3], state[2][3], state[3][3], state[0][3]
def _inv_mix_columns(self, state):
for r in range(4):
u = self._xtime(self._xtime(state[r][0] ^ state[r][2]))
v = self._xtime(self._xtime(state[r][1] ^ state[r][3]))
state[r][0] ^= u
state[r][1] ^= v
state[r][2] ^= u
state[r][3] ^= v
for r in range(4):
t = state[r][0] ^ state[r][1] ^ state[r][2] ^ state[r][3]
u = state[r][0]
state[r][0] ^= t ^ self._xtime(state[r][0] ^ state[r][1])
state[r][1] ^= t ^ self._xtime(state[r][1] ^ state[r][2])
state[r][2] ^= t ^ self._xtime(state[r][2] ^ state[r][3])
state[r][3] ^= t ^ self._xtime(state[r][3] ^ u)
@staticmethod
def _xtime(a):
return ((a << 1) ^ 0x1B) & 0xFF if a & 0x80 else a << 1
def decrypt_all_files(aes_cipher, iv):
for idx in range(FILE_COUNT):
src_path = f"{LOCKED_DIR}\\file_{idx}.solar.locked"
dst_path = f"{LOCKED_DIR}\\file_{idx}.solar"
with open(src_path, "rb") as f:
raw = f.read()
encrypted_content = raw[:-TAIL_SIZE]
original_size, _ = parse_tail_metadata(raw)
decrypted = aes_cipher.decrypt_cbc(encrypted_content, iv)
with open(dst_path, "wb") as f:
f.write(decrypted[:original_size])
os.remove(src_path)
print(f"[+] 解密完成: file_{idx}.solar ({original_size} bytes)")
def main():
groups = scan_locked_files()
print(f" 公钥1加密的文件数: {len(groups[1])}")
print(f" 公钥4加密的文件数: {len(groups[4])}")
_, data1 = groups[1][0]
_, data4 = groups[4][0]
_, c1 = parse_tail_metadata(data1)
_, c2 = parse_tail_metadata(data4)
print(f" 密文c1: {hex(c1)[:40]}...")
print(f" 密文c2: {hex(c2)[:40]}...")
e1, n1 = decode_pubkey(RSA_PUBKEYS[1])
e2, n2 = decode_pubkey(RSA_PUBKEYS[4])
print(f" e1 = {e1}")
print(f" e2 = {e2}")
print(f" n1 == n2: {n1 == n2}")
aes_key_int = common_modulus_attack(c1, c2, e1, e2, n1)
aes_key = long_to_bytes(aes_key_int)[::-1]
print(f" 恢复的AES密钥: {aes_key.hex()}")
iv = list(aes_key[:16])
round_keys = expand_aes_key(aes_key)
print(f" IV: {bytes(iv).hex()}")
print(f" 轮密钥长度: {len(round_keys)} bytes")
cipher = ModifiedAES(round_keys)
decrypt_all_files(cipher, iv)
print("\n" + "=" * 50)
print("解密完成!")
print("=" * 50)
main()
|
