Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/10527#discussion_r48918992
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/misc.scala
---
@@ -221,3 +224,147 @@ 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. 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.""",
+ extended = """> SELECT Base64(_FUNC_('ABC', '1234567890123456'));
+ 'y6Ss+zCYObpCbgfWfyNWTw=='"""
+)
+case class AesEncrypt(left: Expression, right: Expression)
+ extends BinaryExpression with Serializable 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: InvalidKeyException => null
+ }
+ }
+
+ override def genCode(ctx: CodeGenContext, ev: GeneratedExpressionCode):
String = {
+ nullSafeCodeGen(ctx, ev, (str, key) => {
+ val Cipher = "javax.crypto.Cipher"
+ val SecretKeySpec = "javax.crypto.spec.SecretKeySpec"
+ s"""
+ try {
+ $Cipher cipher = $Cipher.getInstance("AES");
+ try {
+ if ($key.length == 16 || $key.length == 24 || $key.length ==
32) {
+ cipher.init($Cipher.ENCRYPT_MODE, new $SecretKeySpec($key,
0, $key.length, "AES"));
+ ${ev.value} = cipher.doFinal($str, 0, $str.length);
+ } else {
+ ${ev.isNull} = true;
+ }
+ } catch (java.security.InvalidKeyException e) {
+ org.apache.spark.unsafe.Platform.throwException(e);
+ } catch (javax.crypto.IllegalBlockSizeException e) {
+ org.apache.spark.unsafe.Platform.throwException(e);
+ } catch (javax.crypto.BadPaddingException e) {
+ org.apache.spark.unsafe.Platform.throwException(e);
+ }
+ } catch(java.security.NoSuchAlgorithmException e) {
+ org.apache.spark.unsafe.Platform.throwException(e);
+ } catch(javax.crypto.NoSuchPaddingException 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
+ * 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) - 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
+ 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.""",
+ extended =
+ """> SELECT
_FUNC_(UnBase64('y6Ss+zCYObpCbgfWfyNWTw=='),'1234567890123456');
+ 'ABC'"""
+)
+case class AesDecrypt(left: Expression, right: Expression)
+ extends BinaryExpression with Serializable with ImplicitCastInputTypes {
+
+ override def dataType: DataType = StringType
+ 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 = 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.DECRYPT_MODE, secretKey)
+ UTF8String.fromBytes(
+ cipher.doFinal(input1.asInstanceOf[Array[Byte]], 0,
+ input1.asInstanceOf[Array[Byte]].length))
+ } catch {
+ case e: InvalidKeyException => UTF8String.fromBytes(null)
--- End diff --
can we just use `null`?
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