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参数资料
| 型号： | MPC185TS |
| 厂商： | Motorola, Inc. |
| 英文描述： | Security Processor |
| 中文描述： | 安全处理器 |
| 文件页数： | 8/12页 |
| 文件大小： | 227K |
| 代理商： | MPC185TS |
8
MPC185 Security Processor Technical Summary
For More Information On This Product,
Go to: www.freescale.com
MOTOROLA
cryptographic function. For example, at the highest level, the accelerator performs modular exponentiations
to support RSA and performs point multiplies to support ECC. At the lower levels, the PKEU can perform
simple operations such as modular multiplies.
7.1.1 Elliptic Curve Operations
The PKEU has its own data and control units, including a general-purpose register file in the
programmable-size arithmetic unit. The field or modulus size can be programmed to any value between 160
bits and 512 bits in programmable increments of 8, with each programmable value
i
supporting all actual
field sizes from
i
*8 -7 to
i
*8. The result is hardware supporting a wide range of cryptographic security.
Larger field / modulus sizes result in greater security but lower performance; processing time is determined
by field or modulus size. For example, a field size of 160 is roughly equivalent to the security provided by
1024 bit RSA. A field size set to 208 roughly equates to 2048 bits of RSA security.
The PKEU contains routines implementing the atomic functions for elliptic curve processing—point
arithmetic and finite field arithmetic. The point operations (multiplication, addition and doubling) involve
one or more finite field operations which are addition, multiplication, inverse, and squaring. Point add and
double each use of all four finite field operations. Similarly, point multiplication uses all EC point operations
as well as the finite field operations. All these functions are supported both in modular arithmetic as well as
polynomial basis finite fields.
7.1.2 Modular Exponentiation Operations
The PKEU is also capable of performing ordinary integer modulo arithmetic. This arithmetic is an integral
part of the RSA public key algorithm; however, it can also play a role in the generation of ECC digital
signatures and Diffie-Hellman key exchanges.
Modular arithmetic functions supported by the MPC185’s PKEU include the following:
R 2 mod N
A’ E mod N
(A
×
B) R
–1
mod N
(A
×
B) R
–2
mod N
(A + B) mod N
(A – B) mod N
Where the following variable definitions: A’ = AR mod N, N is the modulus vector, A and B are input
vectors, E is the exponent vector, R is 2
s
, where s is the bit length of the N vector rounded up to the nearest
multiple of 32.
The PKEU can perform modular arithmetic on operands up to 2048 bits in length. The modulus must be
larger than or equal to 129 bits. The PKEU uses the Montgomery modular multiplication algorithm to
perform core functions. The addition and subtraction functions exist to help support known methods of the
Chinese Remainder Theorem (CRT) for efficient exponentiation.
7.2 Data Encryption Standard Execution Unit (DEU)
The DES Execution Unit (DEU) performs bulk data encryption/decryption, in compliance with the Data
Encryption Standard algorithm (ANSI x3.92). The DEU can also compute 3DES and extension of the DES
F
Freescale Semiconductor, Inc.
n
.
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