FYKI, that law is in force since long time, and it is not Modi who passed that law. It was passed in 2000 by parliament of India and it was debated, discussed by Govt and opposition MP's all clauses including this, if it was emergency, etc SC has the powers to strike it down.
And that Procedure and safeguards for interception, monitoring and Decryption of Information passed in 2009 (UPA) Govt
If u have time pls go to SC and seek their clarification, and dont try to create fear in peoples mind.