Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/10527#discussion_r48918891 --- 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 { --- End diff -- no need to `with Serializable`
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