HASH GUARD 🔐

Cryptography Operations using mbedtls

This C program demonstrates cryptographic operations using the mbedtls library, including SHA-256 hashing, RSA encryption/decryption, 3DES encryption/decryption, and AES encryption/decryption.

Features

1. SHA-256 Hashing:

   • Computes the SHA-256 hash of a user-provided 32-byte message.

2. RSA Operations:

   • Encrypts and decrypts messages using RSA.
   • Generates RSA key pairs (public and private keys).
   • Creates and verifies digital signatures.

3. 3DES Encryption/Decryption:

   • Encrypts and decrypts messages using 3DES (Triple DES).

4. AES Encryption/Decryption:

   • Encrypts and decrypts messages using AES (Advanced Encryption Standard).

Prerequisites

• Docker: Ensure that you have docker installed on your system and is running while creating and running the docker image.

Compilation

To compile the code and create a docker image use the following command:

docker build -t crypto_app_image .

Usage

Run the compiled program and follow the prompts to select the desired cryptographic operation:

docker run -it crypto_app_image

1. SHA-256 Hashing

• Operation: Hashes a 32-byte message using SHA-256.
• Input: Enter a message (max 32 bytes).
• Output: SHA-256 hash of the message.

2. RSA Encryption/Decryption

• Operation: Perform RSA encryption, decryption, key pair generation, and digital signature operations.
• Options:
  • Encrypt: Encrypt a message using RSA.
  • Decrypt: Decrypt a message using a specified RSA private key.
  • Generate RSA Key Pair: Generate a new RSA public/private key pair and save to PEM files.
  • Digital Signature: Sign a message using RSA and a specified private key.
  • Verify Digital Signature: Verify a signature against a message using a specified public key.

3. 3DES Encryption/Decryption

• Operation: Encrypts or decrypts a 32-byte message using 3DES.
• Options:
  • Encrypt: Encrypt a message and display the 3DES key.
  • Decrypt: Decrypt a message using a provided 3DES key.

4. AES Encryption/Decryption

• Operation: Encrypts or decrypts a 32-byte message using AES-256.
• Options:
  • Encrypt: Encrypt a message and display the AES key.
  • Decrypt: Decrypt a message using a provided AES key.

Example

SHA-256 Hashing

Enter a message to hash (max 32 bytes): Hello World
SHA-256 hash:
A591A6D40BF420404A011733C8A5AC54F7FBDC6A7F20D8D8A850A3A5B1C3A3C2

RSA Encryption

Choose an operation:
1. Encrypt
2. Decrypt
3. Generate RSA Key Pair
4. Digital Signature
5. Verify Digital Signature
Enter your choice: 1
Enter a message to encrypt (max 245 bytes): Hello RSA
Encrypted data (hex): [Encrypted data in hex]
RSA Private Key saved to private_key.pem
RSA Public Key saved to public_key.pem

3DES Encryption

Choose operation:
1. Encrypt
2. Decrypt
Enter your choice: 1
Enter a 32-byte message to encrypt: Hello 3DES
Encrypted data (in hex): [Encrypted data in hex]

AES Encryption

Choose operation:
1. Encrypt
2. Decrypt
Enter your choice: 1
Enter a 32-byte message to encrypt: Hello AES
Encrypted data (in hex): [Encrypted data in hex]

Files

• private_key.pem: Contains the RSA private key.
• public_key.pem: Contains the RSA public key.
• hash_value.bin: Contains the hash value of a message for digital signature.
• crypto_operations: The compiled binary executable.
• dockerfile: The docker file that is used to create the docker image.

Team - BYTEFORGE

• S.Neelothpal Team Lead
• D.Sathvika Team member
• M.Sri Priya Bhargavi Team member
• MD.Abdul Azeez Team member
• M.Anudeep Team member

Acknowledgements

• mbedtls library for cryptographic functions.
• mbedTLS Documentation for reference.

References

• SHA-256 Algorithm
• RSA Algorithm
• Triple DES (3DES)
• AES (Advanced Encryption Standard)

Feel free to modify the example commands, file names, and paths as per your specific requirements or environment. 😊