cryptou.h

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#ifndef CRYPTOU_H
#define CRYPTOU_H
 
#include <stddef.h>
#include <stdint.h>
#include <sys/types.h>
 
#define AES_BLOCK_SIZE 16
#define IV_SIZE AES_BLOCK_SIZE
#define SALT_SIZE 16
#define AES_KEY_SIZE 32
#define MAX_KEY_ITERATIONS 1000
 
#define MAX_CERT_FIELD_SIZE 64
 
struct certificate_meta {
  long not_before;
  long not_after;
  char c[MAX_CERT_FIELD_SIZE];
  char o[MAX_CERT_FIELD_SIZE];
  char ou[MAX_CERT_FIELD_SIZE];
  char cn[MAX_CERT_FIELD_SIZE];
};
 
enum CRYPTO_KEY_TYPE { CRYPTO_KEY_NONE = 0, CRYPTO_KEY_RSA, CRYPTO_KEY_EC };
 
int crypto_geniv(uint8_t *buf, int iv_size);
 
int crypto_gensalt(uint8_t *buf, int salt_size);
 
int crypto_genkey(uint8_t *buf, int key_size);
 
int crypto_buf2key(const uint8_t *buf, int buf_size, const uint8_t *salt,
                   int salt_size, uint8_t *key, int key_size);
 
ssize_t crypto_encrypt(const uint8_t *in, int in_size, const uint8_t *key,
                       const uint8_t *iv, uint8_t *out);
 
ssize_t crypto_decrypt(uint8_t *in, int in_size, uint8_t *key, uint8_t *iv,
                       uint8_t *out);
 
int crypto_generate_privkey_str(enum CRYPTO_KEY_TYPE type, int bits,
                                char **key);
 
int crypto_generate_pubkey_str(uint8_t *key, size_t key_size, char **pub);
 
int crypto_generate_cert_str(struct certificate_meta *meta, uint8_t *key,
                             size_t key_size, char **cert);
 
ssize_t crypto_sign_data(uint8_t *key, size_t key_size, uint8_t *in,
                         size_t in_size, uint8_t **out);
#endif