diffie_hellman 1.1.1

Dart implementation of finite field Diffie-Hellman. Based on PKCS#3.

Dart Diffie-Hellman

Dart implementation of finite field Diffie-Hellman. Based on PKCS#3.

Usage

DhPkcs3Engine dhEngine = DhPkcs3Engine.fromGroup(DhGroup.g5);
DhPkcs3Engine otherDhEngine = DhPkcs3Engine.fromGroup(DhGroup.g5);

DhKeyPair keyPair = dhEngine.generateKeyPair();
DhKeyPair otherKeyPair = otherDhEngine.generateKeyPair();

print('Public Key: ${keyPair.publicKey.value}');
print('Private Key: ${keyPair.privateKey.value}');
print('Other public Key: ${otherKeyPair.publicKey.value}');
print('Other private Key: ${otherKeyPair.privateKey.value}');

print(
'Secret Key: ${dhEngine.computeSecretKey(otherKeyPair.publicKey.value)}',
);
print(
'Other secret Key: ${otherDhEngine.computeSecretKey(keyPair.publicKey.value)}',
);

PEM serialization/deserialization

Each key can be constructed from a PEM string

DhPrivateKey privateKey = DhPrivateKey.fromPem('...');
DhPublicKey publicKey = DhPublicKey.fromPem('...');

On the other hand, the keys can be serialized to a PEM string

String privateKeyPem = privateKey.toPem();
String publicKeyPem = publicKey.toPem();

The same applies to the DH parameters

DhParameters parameters = DhParameters.fromPem('...');
String parametersPem = parameters.toPem();

DH Groups

Group ID	Modulus length	Strength range (in bits)
1	768-bit	-
2	1024-bit	-
5	1536-bit	90-120
14	2048-bit	110-160
15	3072-bit	130-210
16	4096-bit	150-240
17	6144-bit	170-270
18	8192-bit	190-310

References

• https://www.teletrust.de/fileadmin/files/oid/oid_pkcs-3v1-4.pdf
• https://www.ietf.org/rfc/rfc3526.txt