blob: 657da509c489c1e7adf3c4d6fc74e0687613e029 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
|
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Pqc.Crypto.Utilities;
using Org.BouncyCastle.Security;
namespace Org.BouncyCastle.Pqc.Crypto.Cmce
{
public class CmceKemGenerator
: IEncapsulatedSecretGenerator
{
// the source of randomness
private SecureRandom sr;
public CmceKemGenerator(SecureRandom random)
{
this.sr = random;
}
public ISecretWithEncapsulation GenerateEncapsulated(AsymmetricKeyParameter recipientKey)
{
CmcePublicKeyParameters key = (CmcePublicKeyParameters)recipientKey;
CmceEngine engine = key.Parameters.Engine;
return GenerateEncapsulated(recipientKey, engine.DefaultSessionKeySize);
}
private ISecretWithEncapsulation GenerateEncapsulated(AsymmetricKeyParameter recipientKey, int sessionKeySizeInBits)
{
CmcePublicKeyParameters key = (CmcePublicKeyParameters)recipientKey;
CmceEngine engine = key.Parameters.Engine;
byte[] cipher_text = new byte[engine.CipherTextSize];
byte[] sessionKey = new byte[sessionKeySizeInBits / 8]; // document as 32 - l/8 - Section 2.5.2
engine.kem_enc(cipher_text, sessionKey, key.publicKey, sr);
return new SecretWithEncapsulationImpl(sessionKey, cipher_text);
}
}
}
|