public virtual byte[] ExportKeyingMaterial(string asciiLabel, byte[] context_value, int length)
{
if (context_value != null && !TlsUtilities.IsValidUint16(context_value.Length))
{
throw new ArgumentException("must have length less than 2^16 (or be null)", "context_value");
}
SecurityParameters sp = SecurityParameters;
if (!sp.IsExtendedMasterSecret)
{
/*
* RFC 7627 5.4. If a client or server chooses to continue with a full handshake without
* the extended master secret extension, [..] the client or server MUST NOT export any
* key material based on the new master secret for any subsequent application-level
* authentication. In particular, it MUST disable [RFC5705] [..].
*/
throw new InvalidOperationException("cannot export keying material without extended_master_secret");
}
byte[] cr = sp.ClientRandom, sr = sp.ServerRandom;
int seedLength = cr.Length + sr.Length;
if (context_value != null)
{
seedLength += (2 + context_value.Length);
}
byte[] seed = new byte[seedLength];
int seedPos = 0;
Array.Copy(cr, 0, seed, seedPos, cr.Length);
seedPos += cr.Length;
Array.Copy(sr, 0, seed, seedPos, sr.Length);
seedPos += sr.Length;
if (context_value != null)
{
TlsUtilities.WriteUint16(context_value.Length, seed, seedPos);
seedPos += 2;
Array.Copy(context_value, 0, seed, seedPos, context_value.Length);
seedPos += context_value.Length;
}
if (seedPos != seedLength)
{
throw new InvalidOperationException("error in calculation of seed for export");
}
return(TlsUtilities.PRF(this, sp.MasterSecret, asciiLabel, seed, length));
}
public byte[] ExportKeyingMaterial(string asciiLabel, byte[] context_value, int length)
{
if (context_value != null && !TlsUtilities.IsValidUint16(context_value.Length))
{
throw new ArgumentException("'context_value' must have length less than 2^16 (or be null)");
}
SecurityParameters sp = this.securityParameters;
byte[] cr = sp.ClientRandom, sr = sp.ServerRandom;
int seedLength = cr.Length + sr.Length;
if (context_value != null)
{
seedLength += (2 + context_value.Length);
}
byte[] seed = new byte[seedLength];
int seedPos = 0;
Array.Copy(cr, 0, seed, seedPos, cr.Length);
seedPos += cr.Length;
Array.Copy(sr, 0, seed, seedPos, sr.Length);
seedPos += sr.Length;
if (context_value != null)
{
TlsUtilities.WriteUint16(context_value.Length, seed, seedPos);
seedPos += 2;
Array.Copy(context_value, 0, seed, seedPos, context_value.Length);
seedPos += context_value.Length;
}
if (seedPos != seedLength)
{
throw new InvalidOperationException("error in calculation of seed for export");
}
return(TlsUtilities.PRF(this, sp.MasterSecret, asciiLabel, seed, length));
}
public virtual byte[] ExportKeyingMaterial(string asciiLabel, byte[] context_value, int length)
{
if (context_value != null && !TlsUtilities.IsValidUint16(context_value.Length))
{
throw new ArgumentException("must have length less than 2^16 (or be null)", "context_value");
}
SecurityParameters securityParameters = SecurityParameters;
byte[] clientRandom = securityParameters.ClientRandom;
byte[] serverRandom = securityParameters.ServerRandom;
int num = clientRandom.Length + serverRandom.Length;
if (context_value != null)
{
num += 2 + context_value.Length;
}
byte[] array = new byte[num];
int num2 = 0;
Array.Copy(clientRandom, 0, array, num2, clientRandom.Length);
num2 += clientRandom.Length;
Array.Copy(serverRandom, 0, array, num2, serverRandom.Length);
num2 += serverRandom.Length;
if (context_value != null)
{
TlsUtilities.WriteUint16(context_value.Length, array, num2);
num2 += 2;
Array.Copy(context_value, 0, array, num2, context_value.Length);
num2 += context_value.Length;
}
if (num2 != num)
{
throw new InvalidOperationException("error in calculation of seed for export");
}
return(TlsUtilities.PRF(this, securityParameters.MasterSecret, asciiLabel, array, length));
}
