decrypt ,md5 encrypt data in react native

Question

I want to know, how can I decrypt, md5 encrypt data in react native. May you help me. I can't fine any tutorial in web. I added md5 library for encrypt but I can't decrypt that cod. If you know about encrypt too, please explain that. How can I use in react native cod. Thanks

Answer 1

MD5 is not an encryption algorithm! It is a message-digest algorithm used as a hash function.

Cryptographic hash functions are one-way, deterministic, compression functions that behave randomly.

• One-way means no inverse function exists,
• deterministic means the same inputs result in the same output,
• compression means the input size can be any length but the output size is fixed by the hash function. MD5 has a 128-bit digest size.
• Random means the hash function output is unpredictable before computing.

The MD5 pre-image resistance theoretically is broken bu not practically. Instead of the generic preimage attack with 2¹²⁸ complexity, there is an attack that requires 2^123.4 complexity. MD5, however, is not practically broken. You cannot reach the 123-bit search space in a meaningful time. Consider the collective power of BitCoin miners; in 2020/1/17 they reached 126.1314 Exahashes per second, that makes

• 2⁶⁷ SHA256 double hashes in a second, and
• 2⁹² SHA256 double hashes in a year. So you need 2²¹ years with that power.

However, you can find collisions for MD5. There are two good libraries two produce collisions; corkami or hashclash

For encryption, use AES or ChaCha20 with proper modes like AES-GCM or AES-GCM-SIV and ChaCha20-Poly1305 bot provides authenticated encryption that you will get Confidentiality, Integrity, and authentication.