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https://github.com/Atmosphere-NX/Atmosphere.git
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78 lines
2.5 KiB
Python
78 lines
2.5 KiB
Python
#!/usr/bin/env python
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import sys
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from struct import pack as pk, unpack as up
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from Crypto.Cipher import AES
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from Crypto.Hash import CMAC
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try:
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import KEYS
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except ImportError:
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import KEYS_template as KEYS
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print('Warning: output will not work on 7.0.0+!')
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def shift_left_xor_rb(s):
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if hasattr(int, "from_bytes"):
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N = int.from_bytes(s, byteorder="big")
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else:
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N = int(s.encode('hex'), 16)
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if N & (1 << 127):
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N = ((N << 1) ^ 0x87) & 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
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else:
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N = ((N << 1) ^ 0x00) & 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
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return bytearray.fromhex('%032x' % N)
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def sxor(x, y):
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return bytearray(a^b for a,b in zip(x, y))
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def get_last_block_for_desired_mac(key, data, desired_mac):
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assert len(desired_mac) == 0x10
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k1 = shift_left_xor_rb(AES.new(key, AES.MODE_ECB).encrypt(bytearray(0x10)))
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if len(data) & 0xF:
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k1 = shift_left_xor_rb(k1)
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data += b'\x80'
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data += bytearray((0x10 - (len(data) & 0xF)) & 0xF)
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num_blocks = (len(data) + 0xF) >> 4
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last_block = sxor(bytearray(AES.new(key, AES.MODE_ECB).decrypt(desired_mac)), bytearray(k1))
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if len(data) > 0x0:
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last_block = sxor(last_block, bytearray(AES.new(key, AES.MODE_CBC, bytearray(0x10)).encrypt(data)[-0x10:]))
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return last_block
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def sign_encrypt_code(code, sig_key, enc_key, iv, desired_mac):
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# Pad with 0x20 of zeroes.
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code += bytearray(0x20)
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code_len = len(code)
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code_len += 0xFFF
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code_len &= ~0xFFF
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code += bytearray(code_len - len(code))
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# Add empty trustzone, warmboot segments.
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code += bytearray(0x1FE0 - 0x10)
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pk11_hdr = b'PK11' + pk('<IIIIIII', 0x1000, 0, 0, code_len - 0x20, 0, 0x1000, 0)
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pk11 = pk11_hdr + code
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enc_pk11 = AES.new(enc_key, AES.MODE_CBC, iv).encrypt(pk11)
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enc_pk11 = pk('<IIII', len(pk11) + 0x10, 0, 0, 0) + iv + enc_pk11
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enc_pk11 += get_last_block_for_desired_mac(sig_key, enc_pk11, desired_mac)
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enc_pk11 += CMAC.new(sig_key, enc_pk11, AES).digest()
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return enc_pk11
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def main(argc, argv):
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if argc != 3:
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print('Usage: %s input output' % argv[0])
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return 1
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with open(argv[1], 'rb') as f:
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code = f.read()
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if len(code) & 0xF:
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code += bytearray(0x10 - (len(code) & 0xF))
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# TODO: Support dev unit crypto
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with open(argv[2], 'wb') as f:
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f.write(sign_encrypt_code(code, KEYS.HOVI_SIG_KEY_PRD, KEYS.HOVI_ENC_KEY_PRD, KEYS.IV, b'THANKS_NVIDIA_<3'))
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return 0
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if __name__ == '__main__':
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sys.exit(main(len(sys.argv), sys.argv))
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