/// <summary>
/// Calls EVP_SealInit() and EVP_SealFinal()
/// </summary>
/// <param name="pkeys"></param>
/// <param name="input"></param>
/// <returns></returns>
public Envelope Seal(CryptoKey[] pkeys, byte[] input)
{
Envelope env = new Envelope();
var ptrs = new IntPtr[pkeys.Length];
try {
env.Keys = new byte[pkeys.Length][];
IntPtr[] pubkeys = new IntPtr[pkeys.Length];
int[] ekeylens = new int[pkeys.Length];
for (int i = 0; i < pkeys.Length; i++) {
ptrs[i] = Marshal.AllocHGlobal(pkeys[i].Size);
pubkeys[i] = pkeys[i].Handle;
}
if (this.Cipher.IVLength > 0) {
env.IV = new byte[this.Cipher.IVLength];
}
Native.ExpectSuccess(Native.EVP_SealInit(
this.ptr, this.Cipher.Handle, ptrs, ekeylens, env.IV, pubkeys, pubkeys.Length));
for (int i = 0; i < pkeys.Length; i++) {
env.Keys[i] = new byte[ekeylens[i]];
Marshal.Copy(ptrs[i], env.Keys[i], 0, ekeylens[i]);
}
MemoryStream memory = new MemoryStream();
byte[] output = new byte[input.Length + this.Cipher.BlockSize];
int len;
Native.ExpectSuccess(Native.EVP_EncryptUpdate(this.ptr, output, out len, input, input.Length));
memory.Write(output, 0, len);
Native.ExpectSuccess(Native.EVP_SealFinal(this.ptr, output, out len));
memory.Write(output, 0, len);
env.Data = memory.ToArray();
return env;
}
finally {
foreach (var ptr in ptrs) {
Marshal.FreeHGlobal(ptr);
}
}
}
/// <summary>
/// Calls EVP_SealInit() and EVP_SealFinal()
/// </summary>
/// <param name="pkeys"></param>
/// <param name="needsIV"></param>
/// <returns></returns>
public Envelope Seal(CryptoKey[] pkeys, bool needsIV)
{
Envelope ret = new Envelope();
byte[][] bufs = new byte[pkeys.Length][];
int[] lens = new int[pkeys.Length];
IntPtr[] pubkeys = new IntPtr[pkeys.Length];
ret.Keys = new ArraySegment<byte>[pkeys.Length];
for (int i = 0; i < pkeys.Length; ++i)
{
bufs[i] = new byte[pkeys[i].Size];
lens[i] = pkeys[i].Size;
pubkeys[i] = pkeys[i].Handle;
}
if(needsIV)
ret.IV = new byte[this.cipher.IVLength];
int len;
Native.ExpectSuccess(Native.EVP_SealInit(
this.ptr, this.cipher.Handle, bufs, lens, ret.IV, pubkeys, pubkeys.Length));
for (int i = 0; i < pkeys.Length; ++i)
{
ret.Keys[i] = new ArraySegment<byte>(bufs[i], 0, lens[i]);
}
Native.ExpectSuccess(Native.EVP_SealFinal(this.ptr, null, out len));
ret.Data = new byte[len];
Native.ExpectSuccess(Native.EVP_SealFinal(this.ptr, ret.Data, out len));
return ret;
}