https://github.com/david-oswald/jc_curve25519
Javacard implementation of Curve25519 (prototype, work-in-progress)
https://github.com/david-oswald/jc_curve25519
elliptic-curve-diffie-hellman elliptic-curves javacard smartcard
Last synced: 28 days ago
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Javacard implementation of Curve25519 (prototype, work-in-progress)
- Host: GitHub
- URL: https://github.com/david-oswald/jc_curve25519
- Owner: david-oswald
- License: other
- Created: 2015-08-13T12:46:38.000Z (about 10 years ago)
- Default Branch: master
- Last Pushed: 2021-03-08T09:03:04.000Z (over 4 years ago)
- Last Synced: 2025-04-02T23:51:12.767Z (6 months ago)
- Topics: elliptic-curve-diffie-hellman, elliptic-curves, javacard, smartcard
- Language: Java
- Size: 7.24 MB
- Stars: 30
- Watchers: 7
- Forks: 4
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# jc_curve25519
Javacard implementation of Curve25519 (prototype, work-in-progress).
This code is in the public domain.
## Requirements
- Javacard 3.0.1 or higher (currently developed on J2D081)
- JCDK 3.0.3 or higher (see below)
- Working Java SDK / ant installation
- For testing: Python with smartcard packages
## Building
This code uses the excellent JC Ant task and the GP tool for building and installation. Compile using:
ant curve
This assumes you have a Javacard 3.0.3 SDK (JCDK) in the folder pointed to by build.xml:
Here, we assume the JCDK is one folder up. Change as needed. JCDK packages can e.g. be found at https://github.com/martinpaljak/oracle_javacard_sdks
JC Ant and the GP tool are written by Martin Paljak (https://github.com/martinpaljak) and are available under the MIT / LGPL license (see the respective repositories for details).
## Installation
Upload .cap file after compilation to card using gp:
gp --install curve25519_jc303.cap
If the applet was installed before, remove it first:
gp --uninstall curve25519_jc303.cap
## Testing
Using Python, execute jc_curve25519.py. Requires pyScard to communicate with card. A convenient way under Windows is using Anaconda (http://continuum.io/downloads). An example output could be:
== Testing against test vector ==
pkRef = 0x6a4e9baa8ea9a4ebf41a38260d3abf0d5af73eb4dc7d8b7454a7308909f02085L
pkTest = 0x6a4e9baa8ea9a4ebf41a38260d3abf0d5af73eb4dc7d8b7454a7308909f02085L
diff = 0x0L
== Available readers:
0) SCM Microsystems Inc. SCR35xx USB Smart Card Reader 0
Connecting to first reader ...
ATR: 3B F9 18 00 00 81 31 FE 45 4A 32 44 30 38 31 5F 50 56 B6
App selected
== Testing on-card key generation
pkRef = 0x336f019040df969295182ef7cc4873f2d406a3e878cea1c035d740bdbab673aeL
pkTest = 0x336f019040df969295182ef7cc4873f2d406a3e878cea1c035d740bdbab673aeL
diff = 0x0L
== Testing setting the private key
pkRef = 0x6a4e9baa8ea9a4ebf41a38260d3abf0d5af73eb4dc7d8b7454a7308909f02085L
pkTest = 0x6a4e9baa8ea9a4ebf41a38260d3abf0d5af73eb4dc7d8b7454a7308909f02085L
diff = 0x0L
== Testing generating shared secret
secretRef = 0x4217161e3c9bf076339ed147c9217ee0250f3580f43b8e72e12dcea45b9d5d4aL
secretTest = 0x4217161e3c9bf076339ed147c9217ee0250f3580f43b8e72e12dcea45b9d5d4aL
diff = 0x0L
## Execution times
The execution times are measured using timeit.default_timer. These timings include the communication overhead for sending and receiving data, but not the post-processing in Python:
| Operation | NXP J2D081 contact | NXP J3H145 contact | NXP JCOP4 J3R180 contact |
| ------------- |-------------:| -----:| -------------:|
| On-card key generation (generate 32 random bytes, perform one ECC operation) | 624 ms | 272 ms | 121 ms |
| Set private key (perform one ECC operation) | 618 ms | 255 ms | 92 ms |
| Generate shared secret (perform one ECC operation with pre-set private key) | 122 ms | 77 ms | 39 ms |
The timings are very consistent over multiple executions.
## Acknowledgements
Thanks to Peter Schwabe for his helpful comments and suggestions and to Shaima Al Amri, who worked on this topic for an MSc project.
## License
Public domain, see LICENSE
## Useful links
* https://docs.oracle.com/javacard/3.0.5/api/index.html
* https://github.com/martinpaljak
* http://samuelkerr.com/?p=431