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In this paper we present an architecture development to be used in smart card. The architecture is dedicated for
digital signature and it is based in the use of the open hard and soft sources. The development of the digital signature is
based on the elliptic curve digital signature algorithm (ECDSA) and uses an open source cryptographic library named
Miracl. The hardware development of the architecture is based on the use of the LEON2 soft core processor. To make
Leon suitable for smart card some changes are made in the open VHDL packages of the LEON2 processor. We first in
this paper present the simulation of the developed digital signature on an emulator environment of Leon named TSIM.
Secondly, we show the simulation of the enhanced architecture with the developed elliptic curve digital signature in Modelsim
environment. Finally an FPGA validation of the architecture implementing a 160-bit ECC over GF (p) is made on
an Altera Excalubur development board. In this paper we prove that nowadays some open sources IP cores could be considered
as solutions for soc application development.