base64

Simple cross-platform library written in C, for encryption/decryption in base64. Minimal code. A fixed array is used. The memory is computed and allocated before encoding or decoding. official documents: https://datatracker.ietf.org/doc/html/rfc4648

encoding / decoding string

char* encrypt_data = base64_encode_str("encrypt string"); //encoding in base64
char* decrypt_data = base64_decode_str(encrypt_data);     //decoding from base64
free(encrypt_data);
free(decrypt_data);

encoding / decoding binary

int data[] = { 1, 2, 3, 4, 5 };

char* encrypt_data;
int* decrypt_data;
unsigned int encrypt_size, decrypt_size;
encrypt_data = base64_encode((unsigned char*) data, sizeof (data), &encrypt_size);          //encoding in base64
decrypt_data = base64_decode(encrypt_data, encrypt_size, (unsigned char*) &decrypt_size);   //decoding from base64

printf("encrypt data:\n%s\n\n", encrypt_data);
printf("decrypt data:\n");
for (int i = 0; i < decrypt_size / sizeof (int); i++) {
    printf("%d ", decrypt_data[i]);
}
free(encrypt_data);
free(decrypt_data);