MPC180LMB Freescale Semiconductor, MPC180LMB Datasheet - Page 78

• 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: -

RSA Routines
7.4.3 RSA Montgomery Modular Multiplication
The (A
multiplication except an additional R is divided out. This function is particularly helpful
when using the Chinese Remainder Theorem. This function operates with a minimum of
five digits (Modsize = 4). The complete set of I/O conditions is shown below:
7-28
Computation
Entry name
Entry address
Pre-conditions
Post-conditions
Special
conditions
Figure 7-19. Modular Multiplication (with double reduction) Register Usage
((A
B
Table 7-20. Modular Multiplication (with double reduction)
C = A * B * R
number of digits of the modulus vector
modularmultiply2
0x00b(modularmultiply2)
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.
—
R
B
-2
) mod N calculation is similar to the standard ‘R
Initial Condition
‘0’ - integer-modulo-n enabled
R
Freescale Semiconductor, Inc.
MPC180LMB Security Processor User’s Manual
-2
-2
For More Information On This Product,
modulus N( )
mod N, where A, B, and C are integers less than N and R
) mod N)
‘0’ - ECC disabled
B( )
A( )
Go to: www.freescale.com
Modular Multiply (with double reduction)
set (00)
set (00)
set (00)
set
EXP(k)_SIZE
Modsize
regAsel
regBsel
regNsel
EXP(k)
ECC
XYZ
F2M
B3
B2
B1
B0
A3
A2
A1
A0
N3
N2
N1
N0
same
same
same
same
same
same
C( )
A( )
modulus N( )
Final Condition
= 2
-1
16D
’ Montgomery
where D is the