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This library is a rewrite/update of Matyas Danter's ECC library. All credit goes to him.

For more information on Elliptic Curve Cryptography please readthis fine article.

The library supports the following curves:

• secp112r1
• secp256k1
• nistp192
• nistp224
• nistp256 / secp256r1
• nistp384 / secp384r1
• nistp521

During ECDSA, a random valuek is required. It is acceptable to use a true RNG to generate this value, butshould the samek value ever be repeatedly used for a key, an attacker can recover that signing key.The HMAC random generator can derive a deterministic k value from the message hash and private key, voidingthis concern.

The library uses a non-branching Montgomery ladder for scalar multiplication, as it's constant time and avoids secretdependant branches.

This package is released under the MIT license.

• PHP 7.0+ or PHP 8.0+
• composer
• ext-gmp

Support for older PHP versions:

• v0.4.x: php ^5.6|<7.2
• v0.5.x: php ^7.0
• v1.0.x: php ^7.0|^8.0

You can install this library via Composer :

composer require mdanter/ecc:^1.0

When sending in pull requests, please make sure to run themake command.

The default target runs all PHPUnit and PHPCS tests. All testsmust validate for your contribution to be accepted.

It's also always a good idea to check the results of theScrutinizer analysis for your pull requests.

Examples:

• Key generation
• ECDH exchange
• Signature creation
• Signature verification