Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/10527#discussion_r53546060
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/misc.scala
---
@@ -442,3 +444,90 @@ case class PrintToStderr(child: Expression) extends
UnaryExpression {
""".stripMargin)
}
}
+
+/**
+ * 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 Jurisdic-
+ * tion Policy Files are installed. If either argument is NULL, the result
will also be null. If
+ * input is invalid, key length is not one of the permitted values or
using 192/256 bits key before
+ * installing JCE, an exception will be thrown.
+ */
+@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 inputTypes: Seq[DataType] = Seq(BinaryType, BinaryType)
+
+ protected override def nullSafeEval(input1: Any, input2: Any): Any = {
+ val cipher = Cipher.getInstance("AES")
+ val secretKey: SecretKeySpec = new
SecretKeySpec(input2.asInstanceOf[Array[Byte]], 0,
+ input2.asInstanceOf[Array[Byte]].length, "AES")
+ cipher.init(Cipher.ENCRYPT_MODE, secretKey)
+ cipher.doFinal(input1.asInstanceOf[Array[Byte]], 0,
input1.asInstanceOf[Array[Byte]].length)
+ }
+
+ override def genCode(ctx: CodegenContext, ev: ExprCode): String = {
+ nullSafeCodeGen(ctx, ev, (str, key) => {
+ val Cipher = "javax.crypto.Cipher"
+ val SecretKeySpec = "javax.crypto.spec.SecretKeySpec"
+ s"""
+ try {
+ $Cipher cipher = $Cipher.getInstance("AES");
+ $SecretKeySpec secret = new $SecretKeySpec($key, 0,
$key.length, "AES");
+ cipher.init($Cipher.ENCRYPT_MODE, secret);
+ ${ev.value} = cipher.doFinal($str, 0, $str.length);
+ } catch (java.security.GeneralSecurityException e) {
+ org.apache.spark.unsafe.Platform.throwException(e);
+ }
+ """
+ })
+ }
+}
+
+/**
+ * A function that decrypts 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 Jurisdic-
+ * tion Policy Files are installed. If either argument is NULL, the result
will also be null. If
+ * input is invalid, key length is not one of the permitted values or
using 192/256 bits key before
+ * installing JCE, an exception will be thrown.
+ */
+@ExpressionDescription(
+ usage = "_FUNC_(input, key) - Decrypts input using AES.",
+ extended = "> SELECT
_FUNC_(UnBase64('y6Ss+zCYObpCbgfWfyNWTw=='),'1234567890123456');\n 'ABC'")
+case class AesDecrypt(left: Expression, right: Expression)
--- End diff --
i find it confusing to have left/right here (e.g. input, key)
Let's give them a proper name, and then just `override def left: Expression
= input`.
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