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https://github.com/Atmosphere-NX/Atmosphere.git
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38 lines
1.2 KiB
Python
38 lines
1.2 KiB
Python
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#!/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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import KEYS
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def sign_encrypt_code(code, sig_key, enc_key, iv):
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# Pad with 0x20 of zeroes.
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code += '\x00' * 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 += '\x00' * (code_len - len(code))
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# Add empty trustzone, warmboot segments.
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code += '\x00'*0x1FE0
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pk11_hdr = '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), 0, 0, 0) + iv + enc_pk11
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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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assert (len(code) & 0xF) == 0
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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))
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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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