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ST19KF16

Smartcard MCU With 1088 Bits Modular Arithmetic Processor

STMicroelectronics 

ST19KF16

HARDWARE DESCRIPTION

The ST19KF16, a member of the ST19 device

family, is a serial access microcontroller especially

designed for very large volume and cost competi-

tive secure portable objects, where high perform-

ance Public Key Algorithms will be implemented,

to cut down initialization and communication costs

and to increase security.

Its internal Modular Arithmetic Processor is de-

signed to speed up cryptographic calculations us-

ing Public Key Algorithms. Based on a 1088 bit

architecture, it processes modular multiplication

and squaring up to 2176 bit operands.

The ST19KF16 is based on a STMicroelectronics

8 bit CPU core including on-chip memories: 1984

Bytes of RAM, 32 KBytes of USER ROM and 16

KBytes of EEPROM.

RAM, ROM and EEPROM memories can be con-

figured into partitions. Access rules from any

memory partition to another partition are setup by

the user defined Memory Access Control Logic.

It is manufactured using the highly reliable ST

CMOS EEPROM technology.

As all other ST19 family members, it is fully com-

patible with the ISO standards for Smartcard appli-

cations.

SOFTWARE SUPPORT

SOFTWARE DEVELOPMENT

Software development and firmware (ROM code/

options) generation are completed by the ST16-19

HDS development system.

CRYPTO LIBRARIES

For an easy and efficient use of the Modular Arith-

metic Processor (MAP), ST proposes a complete

set of firmware subroutines. This library is located

in a specific ROM area, leaving 32 KBytes in the

User ROM for the application software. This li-

brary saves the operating system designer from

coding first layer functions and allows the designer

to concentrate on algorithms and Public Key Cryp-

tographic (PKC) protocol implementation.

This library contains firmware functions for:

– loading and unloading parameters and results

to or from the MAP

– calculating Montgomery constants

– basic mathematics including modular squaring

and multiplication for various lengths

– modular exponentiation using or not the Chi-

nese Remainder Theorem (CRT),

– more elaborate functions such as RSA signa-

tures and authentications for any modulo length

up to 2176 bits long or DSA signature and veri-

fication and elliptic curves.

– full internal key generation for signatures/au-

thentications. This guarantees that the secret

key will never be known outside the chip and

contributes to overall system security.

– long random number generation

– sha-1

Figure 1. Block Diagram

a

RAM

1984

Bytes

EEPROM

16 K

Bytes

USER

ROM

32 K

Bytes

SYSTEM ROM

AND

CRYPTO

LIBRARIES

MAP

1088 Bits

MEMORY ACCESS FIREWALL

SYSTEM ROM

AND

MAP FIREWALL

INTERNAL BUS

2/2

CLOCK

GENERA-

TOR

MODULE

8 BIT

TIMER

CLK

SECURITY

ADMINISTRATOR

UNPRE-

DICTABLE

NUMBER

GENERATOR

RESET

VCC

8 BIT

CPU

SERIAL

I/O

INTER-

FACE

GND

I/O

SCP 133b/DS

a

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