ShortSigServerVerifySig( BINK, CDKEY_PID_Part, 4, CDKEY_Sig_Part )

PlausibleKey

checks integrity and CRC

convert_external_key_to_internal(BINK,EBX)

x{+7c}=p (30 byte)

            //signatureRemainBitsFromCDKEY => signature

unpack_signature( edi,

[Out_]BINK_Signature, [Out_]BINK_Hash,

EBX.BINK_Signature-BitSize, EBX.BINK_Hash-BitSize,

CDKEY_Sig_Part)

//CDKEY_Sig_Part is D88(0x53) Bits  which is divided as the following:

                                                28(0x1c) Bits                length given by BINK  Hash

                                                55(0x37) Bits                length given by BINK Signature

            //X=30-byte-int ; e=empty(output)

ecdig_affine_exponentiation  (x{+13C8}, BINK_Signature, 2, e{+38F4}, x{+12C8}, x{+7c})

ecdig_affine_exponentiation  (x{+14C8}, BINK_Hash, 1, e{+39F4}, x{+12C8}, x{+7c})

ecdig_affine_addition             (x{+38F4}, x{+39F4},      e{+3AF4}, x{+12C8}, x{+7c})

ecdig_to_dwords                     (x{+3AF4}, e{+3BF4}60-byte ,x{+7c} , [EBX.]0x0c)

ShortSigHash                           (CDKEY_PID_Part, CDKEY_PID_Part_size, x{+3BF4}60-byte, [EBX.]0x0C*2, e{+3CF4}4-Byte, 0x1C )

                  [cmpData]                                 ([EBX.]1, BINK_Hash, e{+3CF8}4-Byte)

‘Output of convert_external_key_to_internal()

$ ebx >0000000C ....

$+4 >0000001C .. . BINK_Hash-BitSize

$+8 >00000001 ...

$+C >00000037 7... BINK_Signature-BitSize

$+10 >0130DFAE ®ß0

$+14 >6CCC8FD8 Ø�Ìl dpcdll.6CCC8FD8

$+18 >6CCC9008 �Ìl dpcdll.6CCC9008

$+1C >6CCC9068 h�Ìl dpcdll.6CCC9068

$+20 >6CCC90C8 È�Ìl dpcdll.6CCC90C8

$+50 >00000001 Dwords to compare in ‘cmpData’

To debug open DPCDLL-LicViewer.exe under ollydebug place dpcdll.pdb into same dir is where dpcdll.dll is in (mostly that is C:\Windows\system32)

Set a breakpoint to all references to Dpcdll.ecdig_affine_exponentiation and press the ‘Setkey CDKEY=’ to call validation.