pk_get_private_key

actual fun pk_get_private_key(decryption: OlmPkDecryptionPointer, privateKey: ByteArray): ULong
actual fun pk_get_private_key(decryption: OlmPkDecryptionPointer, privateKey: ByteArray): ULong
expect fun pk_get_private_key(decryption: OlmPkDecryptionPointer, privateKey: ByteArray): ULong