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= Script to Decrypt CP Box EMC blob and preserve header =
= Portability =


* (trim 0x80 bytes, entrypoint at 0x100C00)
== hid_auth ==


<source lang="python3">
<pre>
import struct
ED E7 41 CC 7F D6 0E 1F 2D B0 89 16 1F C0 EB 66
from binascii import unhexlify as uhx
7C A4 DA 59 40 CE 19 54 00 90 1D BF 59 25 EE 4F
from binascii import hexlify as hx
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
from Crypto.Cipher import AES
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
from Crypto.Hash import SHA, HMAC
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
</pre>


import os
== ipmi ==
import sys


CIPHERKEYSEMC = ['F0332357C8CFAE7E7E26E52BE9E3AED4']
<pre>
CIPHERKEYSEAP = ['262555E3CF062B070B5AA2CDDF3A5D0E']
53 49 45 49 50 4D 49 00 00 00 00 00 00 00 00 00
HASHERKEYEMC  = ['00000000000000000000000000000000']
1A 88 B2 A3 64 E6 A2 8E 78 08 4E 3F 7F 40 FD 01
HASHERKEYEAP  = ['1EE22F6A189E7D99A28B9A96D3C4DBA2']
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ZEROS128 =      ['00000000000000000000000000000000']
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
</pre>


def aes_decrypt_cbc(key, iv, input):
== kdf_ncdt_psk ==
    return AES.new(key, AES.MODE_CBC, iv).decrypt(input)
   
def aes_encrypt_cbc(key, iv, input):
    return AES.new(key, AES.MODE_CBC, iv).encrypt(input)


def emc_decrypt_header(hdr):
<pre>
    return hdr[:0x30] + aes_decrypt_cbc(uhx(CIPHERKEYSEMC[0]), uhx(ZEROS128[0]), hdr[0x30:0x80])
53 43 45 5F 4B 44 46 5F 4E 43 44 54 5F 50 53 4B
   
59 E6 32 88 B0 4E 7F 68 F8 B8 DB 83 86 1E 07 50
def emc_encrypt_header(hdr):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    return hdr[:0x30] + aes_encrypt_cbc(uhx(CIPHERKEYSEMC[0]), uhx(ZEROS128[0]), hdr[0x30:0x80])
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
   
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
def eap_decrypt_header(hdr):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    return hdr[:0x30] + aes_decrypt_cbc(uhx(CIPHERKEYSEAP[0]), uhx(ZEROS128[0]), hdr[0x30:0x80])
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
   
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
def eap_encrypt_header(hdr):
</pre>
    return hdr[:0x30] + aes_encrypt_cbc(uhx(CIPHERKEYSEAP[0]), uhx(ZEROS128[0]), hdr[0x30:0x80])


def main(argc, argv):
== livedump ==
        with open(sys.argv[1], 'rb') as f:
            data = f.read(0x80)
            type = data[7:8]
            if type == uhx('48'):
                print 'EMC'
                hdr = emc_decrypt_header(data)
                body_aes_key  = hdr[0x30:0x40]
                body_hmac_key = hdr[0x40:0x50]
                body_hmac = hdr[0x50:0x64]
                zeroes = hdr[0x64:0x6C]
                print(hx(zeroes))
                header_hmac = hdr[0x6C:0x80]
                body_len = struct.unpack('<L', hdr[0xc:0x10])[0]
                print body_len
                ehdr = hdr[:0x6C]
                ebody = f.read(body_len)
                bhmac = HMAC.new(body_hmac_key, ebody, SHA)
                hhmac = HMAC.new(uhx(HASHERKEYEMC[0]), ehdr, SHA)
                body = aes_decrypt_cbc(body_aes_key, uhx(ZEROS128[0]), ebody)
                print bhmac.hexdigest()
                print hhmac.hexdigest()
                print hx(body_hmac)
                print hx(header_hmac)
                with open(sys.argv[1] + '.bin', 'wb') as g:
                    g.write(hdr+body)
            if type == uhx('68'):
                print 'EAP'
                hdr = eap_decrypt_header(data)
                body_aes_key  = hdr[0x30:0x40]
                body_hmac_key = hdr[0x40:0x50]
                body_hmac = hdr[0x50:0x64]
                zeroes = hdr[0x64:0x6C]
                print(hx(zeroes))
                header_hmac = hdr[0x6C:0x80]
                body_len = struct.unpack('<L', hdr[0xc:0x10])[0]
                print body_len
                ehdr = hdr[:0x6C]
                ebody = f.read(body_len)
                bhmac = HMAC.new(body_hmac_key, ebody, SHA)
                hhmac = HMAC.new(uhx(HASHERKEYEAP[0]), ehdr, SHA)
                body = aes_decrypt_cbc(body_aes_key, uhx(ZEROS128[0]), ebody)
                print bhmac.hexdigest()
                print hhmac.hexdigest()
                print hx(body_hmac)
                print hx(header_hmac)
                with open(sys.argv[1] + '.bin', 'wb') as g:
                    g.write(hdr+body)
           
           


if __name__ == '__main__':
<pre>
    main(len(sys.argv), sys.argv)
96 1E 5E 85 B5 3E 77 64 43 E5 F4 45 85 E8 90 0A
</source>
52 5E 06 2A 4C 79 64 69 0F 75 2F 28 71 9C 6B A1
A8 C2 A0 0D 84 31 E7 17 DD EF 6D 80 F6 5C AE 32
42 1F CB E5 E7 A4 F9 1F 79 2B 25 C7 A1 0C 9E 5A
7B 07 82 9F F3 7C 3F B4 66 2F CB F8 E4 0A 63 F2
99 EE B8 6F 06 D5 58 CD 6E 8E 6A F7 5E 48 3A 24
CC 73 EA E7 73 2F 44 2F 8B E5 28 FB 19 60 62 50
F4 A9 9C A5 9E FC 63 2C 2D CC 67 73 2B 8B 5A DE
</pre>


= Script to Encrypt CP Box EMC blob (Requires Header from Decrypt Script) =
== logger ==


<source lang="python3">
<pre>
import struct
15 A0 CB 65 D6 A4 05 27 E6 1C CD DA 2A EF 53 3B
from binascii import unhexlify as uhx
13 FC 7C 35 24 14 B3 54 3D C7 83 24 6E FC C9 64
from binascii import hexlify as hx
9D F8 40 9A C2 02 09 82 3C 08 61 2B E6 2A 51 79
from Crypto.Cipher import AES
CF 87 62 61 C0 85 46 C2 A5 DA A1 9B D0 E7 FF 79
from Crypto.Hash import SHA, HMAC
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
import os
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
import sys
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 
</pre>
CIPHERKEYSEMC = ['F0332357C8CFAE7E7E26E52BE9E3AED4']
CIPHERKEYSEAP = ['262555E3CF062B070B5AA2CDDF3A5D0E']
HASHERKEYEMC  = ['00000000000000000000000000000000']
HASHERKEYEAP  = ['1EE22F6A189E7D99A28B9A96D3C4DBA2']
ZEROS128 =      ['00000000000000000000000000000000']
 
def aes_decrypt_cbc(key, iv, input):
    return AES.new(key, AES.MODE_CBC, iv).decrypt(input)
   
def aes_encrypt_cbc(key, iv, input):
    return AES.new(key, AES.MODE_CBC, iv).encrypt(input)
 
def emc_decrypt_header(hdr):
    return hdr[:0x30] + aes_decrypt_cbc(uhx(CIPHERKEYSEMC[0]), uhx(ZEROS128[0]), hdr[0x30:0x80])
   
def emc_encrypt_header(hdr):
    return hdr[:0x30] + aes_encrypt_cbc(uhx(CIPHERKEYSEMC[0]), uhx(ZEROS128[0]), hdr[0x30:])
   
def eap_decrypt_header(hdr):
    return hdr[:0x30] + aes_decrypt_cbc(uhx(CIPHERKEYSEAP[0]), uhx(ZEROS128[0]), hdr[0x30:0x80])
   
def eap_encrypt_header(hdr):
    return hdr[:0x30] + aes_encrypt_cbc(uhx(CIPHERKEYSEAP[0]), uhx(ZEROS128[0]), hdr[0x30:0x80])
 
def main(argc, argv):
        with open(sys.argv[1], 'rb') as f:
            data = f.read()
            type = data[7:8]
            if type == uhx('48'):
                print 'EMC'
               
                body_len = struct.unpack('<L', data[0xc:0x10])[0]
                body = data[0x80:0x80+body_len]
                body_aes_key  = data[0x30:0x40]
                ebody = aes_encrypt_cbc(body_aes_key, uhx(ZEROS128[0]), body)
                body_hmac_key = data[0x40:0x50]
                bhmac = HMAC.new(body_hmac_key, ebody, SHA)
                hdr = (data[0:0x50] + uhx(bhmac.hexdigest()) + data[0x64:0x6C])
                hhmac = HMAC.new(uhx(HASHERKEYEMC[0]), hdr, SHA)
                hdr = (hdr + uhx(hhmac.hexdigest()))
                hdr = emc_encrypt_header(hdr)
                print bhmac.hexdigest()
                print hhmac.hexdigest()
                with open(sys.argv[1] + '.bin', 'wb') as g:
                    g.write(hdr+ebody)
            if type == uhx('68'):
                print 'EAP'
                body_len = struct.unpack('<L', data[0xc:0x10])[0]
                body = data[0x80:0x80+body_len]
                body_aes_key  = data[0x30:0x40]
                ebody = aes_encrypt_cbc(body_aes_key, uhx(ZEROS128[0]), body)
                body_hmac_key = data[0x40:0x50]
                bhmac = HMAC.new(body_hmac_key, ebody, SHA)
                hdr = (data[0:0x50] + uhx(bhmac.hexdigest()) + data[0x64:0x6C])
                hhmac = HMAC.new(uhx(HASHERKEYEAP[0]), hdr, SHA)
                hdr = (hdr + uhx(hhmac.hexdigest()))
                hdr = eap_encrypt_header(hdr)
                print bhmac.hexdigest()
                print hhmac.hexdigest()
                with open(sys.argv[1] + '.bin', 'wb') as g:
                    g.write(hdr+ebody)
           
           
 
if __name__ == '__main__':
    main(len(sys.argv), sys.argv)
</source>
 
= Script to Decrypt or Encrypt EAP Kernel =
 
<source lang="python3">
#!/usr/bin/env python
 
import sys, os, struct
import hashlib, hmac
 
from binascii import unhexlify as uhx
 
from Crypto.Cipher import AES
from itertools import cycle
 
try:
# Python 2
from itertools import izip
except:
    pass
 
def as_uint32(x):
    return x & 0xFFFFFFFF
 
def align_up(x, alignment):
    return (x + (alignment - 1)) & ~(alignment - 1)
 
def align_down(x, alignment):
return x & ~(alignment - 1)
 
def sha1(data):
    return hashlib.sha1(data).digest()
 
def hmac_sha1(key, data):
return hmac.new(key=key, msg=data, digestmod=hashlib.sha1).digest()
 
def xor_string(key, data):
# Python 2
try:
return ''.join(chr(ord(x) ^ ord(y)) for (x, y) in izip(data, cycle(key)))
# Python 3
except:
return bytes(x ^ y for x, y in zip(data, cycle(key)))
 
def aes_encrypt_ecb(key, input):
    aes = AES.new(key, AES.MODE_ECB)
    output = aes.encrypt(input)
    return output
 
def aes_decrypt_ecb(key, input):
    aes = AES.new(key, AES.MODE_ECB)
    output = aes.decrypt(input)
    return output
 
def aes_encrypt_cbc_cts(key, iv, data):
result = b''
size = len(data)
if size == 0:
return result
crypto = AES.new(key, AES.MODE_CBC, iv)
size_aligned = align_down(size, crypto.block_size)
result = crypto.encrypt(data[:size_aligned])
size_left = size - size_aligned
if size_left > 0:
assert size_left < crypto.block_size
crypto = AES.new(key, AES.MODE_ECB)
if size_aligned > AES.block_size:
tmp = crypto.encrypt(result[size_aligned - AES.block_size:size_aligned])
else:
tmp = crypto.encrypt(iv)
result += xor_string(data[size_aligned:], tmp[:size_left])
#assert aes_decrypt_cbc_cts(key, iv, result) == data
return result
 
def aes_decrypt_cbc_cts(key, iv, data):
result = b''
size = len(data)
if size == 0:
return result
crypto = AES.new(key, AES.MODE_CBC, iv)
size_aligned = align_down(size, crypto.block_size)
result = crypto.decrypt(data[:size_aligned])
size_left = size - size_aligned
if size_left > 0:
assert size_left < crypto.block_size
crypto = AES.new(key, AES.MODE_ECB)
if size_aligned > AES.block_size:
tmp = crypto.encrypt(data[size_aligned - AES.block_size:size_aligned])
else:
tmp = crypto.encrypt(iv)
result += xor_string(data[size_aligned:], tmp[:size_left])
#assert aes_encrypt_cbc_cts(key, iv, result) == data
return result
 
if len(sys.argv) < 4:
    script_file_name = os.path.split(sys.argv[0])[1]
    print('usage: {0} <input file> <output file> <enc/dec> [personality]'.format(script_file_name))
    sys.exit()
 
input_file_path = sys.argv[1]
if not os.path.isfile(input_file_path):
    print('error: invalid input file specified')
    sys.exit()
 
output_file_path = sys.argv[2]
if os.path.exists(output_file_path) and not os.path.isfile(output_file_path):
    print('error: invalid output file specified')
    sys.exit()
 
mode = sys.argv[3].lower()
if mode != 'enc' and mode != 'dec':
    print('error: invalid mode')
    sys.exit()
 
# total = 128 bits, symbol = 6 bits
# uid max length = 8 symbols = 48 bits
 
uid_alphabet = ' abcdefghijklmnopqrstuvwxyz' # 5 bits per symbol, 3 bits per byte
uid_max_length = 8
 
def personalize(seed, personality):
    if len(seed) != 16:
        return False
 
    personality = personality.strip()
    if len(personality) == 0:
        print('error: empty personality')
        return False
    if len(personality) > uid_max_length:
        print('error: too large personality')
        return False
 
    personality = personality.lower().ljust(uid_max_length, ' ')
    seed = list(seed)
    pos = 0
    for c in personality:
        idx = uid_alphabet.find(c)
        if idx < 0:
            print('error: invalid character at personality: {0}'.format(c))
            return False
 
        c = ord(seed[pos + 0]) & ~0b00010011
        c |= (idx & 0b10000)
        c |= (idx & 0b10)
        c |= (idx & 0b1)
        seed[pos + 0] = chr(c)
 
        c = ord(seed[pos + 1]) & ~0b00001100
        c |= (idx & 0b1000)
        c |= (idx & 0b100)
        seed[pos + 1] = chr(c)
 
        pos += 2
 
    return ''.join(seed)
 
def unpersonalize(seed):
    if len(seed) != 16:
        return False
 
    personality = ''
    seed = list(seed)
    pos = 0
    for i in range(uid_max_length):
        c1, c2, idx = ord(seed[i * 2 + 0]), ord(seed[i * 2 + 1]), 0
 
        idx |= (c1 & 0b10000)
        idx |= (c1 & 0b10)
        idx |= (c1 & 0b1)
 
        idx |= (c2 & 0b1000)
        idx |= (c2 & 0b100)
 
        personality += uid_alphabet[idx]
 
    return personality


seed = os.urandom(16)
== pfs_sd_auth ==
if len(sys.argv) > 4:
    seed = personalize(seed, sys.argv[4])
    if seed == False:
        sys.exit()
 
MAGIC = 0x12EBC95C
EXPECTED_VERSION = 0x10000
PARTITION_SIZE = 16 * 1024 * 1024
BLOB_MAGIC = 0x4B726E00
SECTOR_SIZE = 0x200
HEADER_FMT = '<II16s20s'
BLOB_INFO_FMT = '<III456x'
 
# CP key
ENC_KEY = uhx('CBCC1E53F42C1CB44D965E233CD792A8')
MAC_KEY = uhx('683D6E2E496687CB5B831DA12BCB001B')
 
if mode == 'dec':
    with open(input_file_path, 'rb') as f:
        # read and decrypt blob info
        magic, version, iv, blob_info_hash = struct.unpack(HEADER_FMT, f.read(struct.calcsize(HEADER_FMT)))
        if magic != MAGIC:
            print('error: invalid header magic: {0:08X}'.format(magic))
            sys.exit()
        if version != EXPECTED_VERSION:
            print('error: invalid version: 0x{0:08X}'.format(version))
            sys.exit()
        #print('iv: {0}'.format(iv.encode('hex').upper()))
        #personality = unpersonalize(iv)
        #print('personality: {0}'.format(personality))
        data = f.read(SECTOR_SIZE - struct.calcsize(HEADER_FMT))
        if data == '' or len(data) != (SECTOR_SIZE - struct.calcsize(HEADER_FMT)):
            print('error: insufficient blob info data')
            print(len(data))
            print(SECTOR_SIZE - struct.calcsize(HEADER_FMT))
            sys.exit()
        data = aes_decrypt_cbc_cts(ENC_KEY, iv, data)
        #print(data.encode('hex'))
        blob_info_calc_hash = hmac_sha1(MAC_KEY, data)
        if blob_info_calc_hash != blob_info_hash:
            print('warning: invalid blob info hash')
 
        # parse blob info
        magic, size, offset = struct.unpack(BLOB_INFO_FMT, data[:struct.calcsize(BLOB_INFO_FMT)])
        if magic != BLOB_MAGIC:
            print('error: invalid blob info magic: 0x{0:08X}'.format(magic))
            #sys.exit()
 
        # read blob data
        f.seek(offset)
        data = f.read(size)
        if data == '' or len(data) != size:
            print(len(data))
            print(size)
            print('error: insufficient blob data')
            sys.exit()
 
    # decrypt blob
    magic, version, iv, blob_hash = struct.unpack(HEADER_FMT, data[:struct.calcsize(HEADER_FMT)])
    if magic != MAGIC:
        print('error: invalid header magic: 0x{0:08X}'.format(magic))
        sys.exit()
    if version != EXPECTED_VERSION:
        print('error: invalid version: 0x{0:08X}'.format(version))
        sys.exit()
    data = aes_decrypt_cbc_cts(ENC_KEY, iv, data[struct.calcsize(HEADER_FMT):])
    blob_calc_hash = hmac_sha1(MAC_KEY, data)
    if blob_calc_hash != blob_hash:
        print('warning: invalid blob hash')
 
    # write blob
    with open(output_file_path, 'wb') as f:
        f.write(data)
elif mode == 'enc':
    # generate random iv
    iv = seed
 
    with open(input_file_path, 'rb') as f:
        # read and encrypt blob data
        data = f.read()
        blob_hash = hmac_sha1(MAC_KEY, data)
        data = aes_encrypt_cbc_cts(ENC_KEY, iv, data)
        data = struct.pack(HEADER_FMT, MAGIC, EXPECTED_VERSION, iv, blob_hash) + data
 
        # generate and encrypt blob info
        size = len(data)
        tmp_data = struct.pack(BLOB_INFO_FMT, BLOB_MAGIC, size, SECTOR_SIZE)
        blob_info_hash = hmac_sha1(MAC_KEY, tmp_data)
        tmp_data = aes_encrypt_cbc_cts(ENC_KEY, iv, tmp_data)
        tmp_data = struct.pack(HEADER_FMT, MAGIC, EXPECTED_VERSION, iv, blob_info_hash) + tmp_data
 
    # write everything
    total_size = len(tmp_data) + len(data)
    with open(output_file_path, 'wb') as f:
        f.write(tmp_data)
        f.write(data)
        padding_size = align_up(total_size, SECTOR_SIZE) - total_size
        if padding_size > 0:
            f.write(b'\0' * padding_size)
        f.seek(PARTITION_SIZE)
        f.truncate()
</source>
 
= Script to Decrypt env.img =
 
<source lang="python3">
import sys
import struct
 
def unscramble(data):
    data_size = len(data)
    num_dwords = data_size // 4
    magic = 0x012BB055 # TODO: constant from header @ 0xC
    new_data = bytearray()
    for i in range(num_dwords):
        value = struct.unpack_from('<I', data, i * 4)[0]
        value, magic = value ^ magic, value
        new_data += struct.pack('<I', value)
    return new_data
   
with open(sys.argv[1],"rb") as file:
    file.seek(0x40)
    data=file.read(0xFF80)
    new_data = unscramble(data)
    with open(sys.argv[2],"wb") as file2:
        file2.write(new_data)
</source>
 
= Fake Keys =
 
This section should explain in what the following keys are fake.


<pre>
<pre>
PK0=C1E20574525331AE3E9ABFDFE3E64EB3AA1FD0CD30E3C286CEB84C0C280574E6
2B CF 69 8E 79 CF DD FA C2 4D 4C 25 BF 35 1E 62
PK1=B8F64A4C3DC41A01C039BD1EBCDA3F9E25461024C8817CA8A0281126521884D0
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
PK2=5B031A912D8C2C8BACD4A919274827EBF4F855041C6B911DEABD26FCC38B2D86
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
PK3=53C9558316D34E6036A372BDA0238B4AB2D1B3E22074065BDD22DBC8584AD4C7
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
PK4=FBF4549BB1278E2336071887439BF819ACBB4292F7DA46729A76217419243C4B
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
PK5=89132F5E01643367499C866DB7B1E7C0C8040EF7DE13516BC7776D97FAB9DB7B
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
PK6=7FF33CBD9689177E5D8FD6BD2AA6BE0553893F63E525447DC5745BB9650CE69A
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
PK7=E4767D540A9E9531BDD3FB2302806A953E6920B15B8AE41C4D471B91422510A8
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
PK9=A5F56F9B07BD524BE2BFFD2C9AA3D80D070A5A5010BEF863F6C64BFA282B76F9
PK10=0DC5A3E6CF63DD71744F1854A6CBF64C13CE4358AE3C2EBE959C8C3B3F6B79B2
 
PKA0=3F3B86299E4598147DD1A9A8D314081FE8EE67DDFBAE20
PKA1=2D85350A3BC10ED683101EBBCAC799A5D1B87F6C32A833
PKA2=45DE1F88B189E2D453FEAEA559F02157A21F3DB92C7826
PKA3=B7C26B663BDDE355D1B516B7CE9F0D41A82A61FDC7A6B6
PKA4=6CB6896E6D2C61B33817C2927B032EC7FBE01D0B8BC75E
</pre>
</pre>
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