Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/10527#discussion_r51355177
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/misc.scala
---
@@ -453,3 +455,119 @@ case class Murmur3Hash(children: Seq[Expression],
seed: Int) extends Expression
}
}
}
+
+/**
+ * A function that encrypts input using AES. Key lengths of 128, 192 or
256 bits can be used.
+ * 192 and 256 bits keys can be used if Java Cryptography Extension (JCE)
Unlimited Strength
+ * Jurisdiction Policy Files are installed. If either argument is NULL or
the key length is
+ * not one of the permitted values, the return value is NULL.
+ */
+@ExpressionDescription(
+ usage = "_FUNC_(input, key) - Encrypts input using AES.",
+ extended = "> SELECT Base64(_FUNC_('ABC', '1234567890123456'));\n
'y6Ss+zCYObpCbgfWfyNWTw=='")
+case class AesEncrypt(left: Expression, right: Expression)
+ extends BinaryExpression with ImplicitCastInputTypes {
+
+ override def dataType: DataType = BinaryType
+ override def nullable: Boolean = true
+
+ override def inputTypes: Seq[DataType] = Seq(BinaryType, BinaryType)
+
+ protected override def nullSafeEval(input1: Any, input2: Any): Any = {
+ val cipher = Cipher.getInstance("AES")
+ val secretKey: SecretKeySpec = input2.asInstanceOf[Array[Byte]].length
match {
+ case 16 | 24 | 32 =>
+ new SecretKeySpec(input2.asInstanceOf[Array[Byte]], 0,
+ input2.asInstanceOf[Array[Byte]].length, "AES")
+ case _ => null
+ }
+
+ try {
+ cipher.init(Cipher.ENCRYPT_MODE, secretKey)
+ cipher.doFinal(input1.asInstanceOf[Array[Byte]], 0,
input1.asInstanceOf[Array[Byte]].length)
+ } catch {
+ case e: GeneralSecurityException => null
--- End diff --
I'm not quite sure how we should deal with errors, return null or throw
exception? cc @marmbrus
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