MPC180LMB Freescale Semiconductor, MPC180LMB Datasheet - Page 77

• Manufacturer Part Number: MPC180LMB
• Description: IC SECURITY PROCES 66MHZ 100LQFP
• Manufacturer: Freescale Semiconductor

Specifications of MPC180LMB

• Processor Type: Security Processor
• Speed: 66MHz
• Voltage: 1.8V
• Mounting Type: Surface Mount
• Package / Case: 100-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Features: -

Computation
Entry name
Entry address
Pre-conditions
Post-conditions
Special
conditions
7.4.2 RSA Montgomery Modular Multiplication
The (A
the exponentiation routine in completing its operation though it is also available to the host
processor - typically to put messages into the Montgomery format. This function operates
with a minimum of five digits (Modsize = 4). The complete set of I/O conditions is shown
below:
Prior to initiating this function, the A and B register pointers must be set in the control
register which indicate which sub-registers (e.g A0, B0, A1, B1, etc.) are the targeted
operands. See Table 7-2 for a detailed description. Once this is performed, the host
processor may successfully initiate this function.
((A
B
C = A * B * R
number of digits of the modulus vector
modularmultiply
0x00a(modularmultiply)
A0-3 = A
B0-3 = B
N0-3 = modulus
A0-3 = A operand is preserved
B0-3 = results of modular multiplication stored where the B operand was located
Unless explicitly noted, all other registers are not guaranteed to be any particular value.
Typically, though it is not mandatory, the operands will be in the Montgomery residue system. The only
time this would not be the case is when manually placing a value into the Montgomery residue system.
R
-1
Figure 7-18. Modular Multiplication Register Usage
B
) mod N calculation is the core function of the PKEU. It is used to assist
Initial Condition
‘0’ - integer-modulo-n enabled
R
-1
Freescale Semiconductor, Inc.
mod N, where A, B, and C are integers less than N and R = 2
-1
modulus N( )
For More Information On This Product,
Table 7-19. Modular Multiplication
) mod N)
Chapter 7. Public Key Execution Unit
‘0’ - ECC disabled
B( )
A( )
Go to: www.freescale.com
set (00)
set (00)
set (00)
set
EXP(k)_SIZE
Modsize
regNsel
regAsel
regBsel
EXP(k)
ECC
XYZ
F2M
N3
N2
N1
N0
B3
B2
B1
B0
A3
A2
A1
A0
Modular Multiply
same
same
same
same
same
same
C( )
modulus N( )
Final Condition
A( )
16D
where D is the
RSA Routines
7-27