private static void ExtractCore(
SecureMemoryHandle inputKeyingMaterial,
ReadOnlySpan <byte> salt,
Span <byte> pseudorandomKey)
{
bool addedRef = false;
try
{
inputKeyingMaterial.DangerousAddRef(ref addedRef);
ExtractCore(inputKeyingMaterial.DangerousGetSpan(), salt, pseudorandomKey);
}
finally
{
if (addedRef)
{
inputKeyingMaterial.DangerousRelease();
}
}
}
private protected virtual void DeriveBytesCore(
SecureMemoryHandle inputKeyingMaterial,
ReadOnlySpan <byte> salt,
ReadOnlySpan <byte> info,
Span <byte> bytes)
{
bool addedRef = false;
try
{
inputKeyingMaterial.DangerousAddRef(ref addedRef);
DeriveBytesCore(inputKeyingMaterial.DangerousGetSpan(), salt, info, bytes);
}
finally
{
if (addedRef)
{
inputKeyingMaterial.DangerousRelease();
}
}
}
internal virtual void DeriveKeyCore(
SecureMemoryHandle inputKeyingMaterial,
ReadOnlySpan <byte> salt,
ReadOnlySpan <byte> info,
SecureMemoryHandle keyHandle)
{
bool addedRef = false;
try
{
keyHandle.DangerousAddRef(ref addedRef);
DeriveBytesCore(inputKeyingMaterial, salt, info, keyHandle.DangerousGetSpan());
}
finally
{
if (addedRef)
{
keyHandle.DangerousRelease();
}
}
}
public static SecureMemoryHandle CreateFrom(
ReadOnlySpan <byte> source)
{
SecureMemoryHandle handle = Create(source.Length);
bool mustCallRelease = false;
try
{
handle.DangerousAddRef(ref mustCallRelease);
source.CopyTo(handle.DangerousGetSpan());
}
finally
{
if (mustCallRelease)
{
handle.DangerousRelease();
}
}
return(handle);
}
internal override void CreateKey(
SecureMemoryHandle keyHandle,
out byte[] publicKeyBytes)
{
Span <byte> seed;
try
{
unsafe
{
byte *pointer = stackalloc byte[crypto_sign_ed25519_SEEDBYTES];
seed = new Span <byte>(pointer, crypto_sign_ed25519_SEEDBYTES);
}
bool addedRef = false;
try
{
keyHandle.DangerousAddRef(ref addedRef);
keyHandle.DangerousGetSpan().Slice(0, crypto_sign_ed25519_SEEDBYTES).CopyTo(seed);
}
finally
{
if (addedRef)
{
keyHandle.DangerousRelease();
}
}
publicKeyBytes = new byte[crypto_sign_ed25519_PUBLICKEYBYTES];
crypto_sign_ed25519_seed_keypair(publicKeyBytes, keyHandle, ref seed.DangerousGetPinnableReference());
}
finally
{
sodium_memzero(ref seed.DangerousGetPinnableReference(), (UIntPtr)seed.Length);
}
}