gnutls_cipher_encrypt3 - Linux
Overview
gnutls_cipher_encrypt3 is a function in the GnuTLS library specifically designed to encrypt data using a specified cipher and a given key in the third iteration. This command is commonly used in cryptographic operations, such as securing communication channels or protecting sensitive data.
Syntax
int gnutls_cipher_encrypt3(const gnutls_cipher_algorithm_t *cipher,
const unsigned char *iv,
const unsigned char *key,
const unsigned char *plaintext,
size_t plaintext_length,
unsigned char *ciphertext,
size_t ciphertext_length);
Options/Flags
None.
Examples
// Encrypt a message using AES-256 with a given key and IV
unsigned char plaintext[] = "Top Secret!";
unsigned char key[] = "..." // Replace with your actual key
unsigned char iv[] = "..." // Replace with your actual IV
unsigned char ciphertext[256]; // Buffer for encrypted message
// Encrypt the plaintext
gnutls_cipher_encrypt3(GNUTLS_CIPHER_AES_256, iv, key,
plaintext, strlen(plaintext), ciphertext, sizeof(ciphertext));
// Print out the encrypted ciphertext
printf("Encrypted ciphertext: ");
for (size_t i = 0; i < strlen(plaintext); i++) {
printf("%02X", ciphertext[i]);
}
printf("\n");
Common Issues
- Invalid key size: Ensure that the provided key is the correct size for the specified cipher.
- Invalid IV size: The IV (initialization vector) size must match the block size of the cipher.
- Buffer overflow: The ciphertext buffer must be large enough to accommodate the encrypted message.
Integration
gnutls_cipher_encrypt3 can be integrated with other GnuTLS functions to create more complex cryptographic operations. For example, it can be combined with gnutls_cipher_decrypt3 for decryption or gnutls_cipher_init to initialize a cipher structure.
Related Commands
gnutls_cipher_decrypt3gnutls_cipher_initgnutls_certificate_verify