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Add parameter to allow custom BitStrength for keys #6

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Add parameter to allow custom BitStrength for keys #6

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42 changes: 26 additions & 16 deletions lib/rsa_encrypt.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -14,9 +14,33 @@ class RsaKeyHelper {
///
/// Returns a [AsymmetricKeyPair] based on the [RSAKeyGenerator] with custom parameters,
/// including a [SecureRandom]
///
/// The parameter [secureRandomAndBitStrength] is an array of length 2 that
/// uses a [SecureRandom] as first value and an [int] as second value for the BitStrength
///
/// Recommended BitStrength [1024, 2048 or 4096] - default BitStrength [2048]
static AsymmetricKeyPair<PublicKey, PrivateKey> getRsaKeyPair(
List<dynamic> secureRandomAndBitStrength) {
var rsapars = new RSAKeyGeneratorParameters(
BigInt.from(65537), secureRandomAndBitStrength.last, 5);
var params =
new ParametersWithRandom(rsapars, secureRandomAndBitStrength.first);
var keyGenerator = new RSAKeyGenerator();
keyGenerator.init(params);
return keyGenerator.generateKeyPair();
}

/// Generate a [PublicKey] and [PrivateKey] pair
///
/// Returns a [AsymmetricKeyPair] based on the [RSAKeyGenerator] with custom parameters,
/// including a [SecureRandom]
///
/// Accepts a custom [int] as BitStrength. Recommended BitStrength [1024, 2048 or 4096]
/// - default BitStrength [2048]
Future<AsymmetricKeyPair<PublicKey, PrivateKey>> computeRSAKeyPair(
SecureRandom secureRandom) async {
return await compute(getRsaKeyPair, secureRandom);
SecureRandom secureRandom,
{int bitStrength = 2048}) async {
return await compute(getRsaKeyPair, [secureRandom, bitStrength]);
}

/// Generates a [SecureRandom] to use in computing RSA key pair
Expand Down Expand Up @@ -247,17 +271,3 @@ String decrypt(String ciphertext, RSAPrivateKey privateKey) {

return new String.fromCharCodes(decrypted);
}

/// Generate a [PublicKey] and [PrivateKey] pair
///
/// Returns a [AsymmetricKeyPair] based on the [RSAKeyGenerator] with custom parameters,
/// including a [SecureRandom]
AsymmetricKeyPair<PublicKey, PrivateKey> getRsaKeyPair(
SecureRandom secureRandom) {
/// Set BitStrength to [1024, 2048 or 4096]
var rsapars = new RSAKeyGeneratorParameters(BigInt.from(65537), 2048, 5);
var params = new ParametersWithRandom(rsapars, secureRandom);
var keyGenerator = new RSAKeyGenerator();
keyGenerator.init(params);
return keyGenerator.generateKeyPair();
}