openssl_encrypt.h

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#ifndef OPENSSL_ENCRYPT_H_
#define OPENSSL_ENCRYPT_H_
 
struct openssl_encrypt;
 
enum openssl_mode {
        MODE_AES128_NONE = 0,
        MODE_AES128_CTR = 1,
        MODE_AES128_CFB = 2,
        MODE_AES128_ECB = 3,
        MODE_AES128_CBC = 4,
        MODE_AES128_GCM = 5,
        MODE_AES128_MAX = MODE_AES128_GCM,
};
 
const void *get_cipher(enum openssl_mode mode);
 
#define MAX_CRYPTO_EXTRA_DATA 36 // == maximal overhead of available encryptions (datalen+IV+CRC/tag)
#define MAX_CRYPTO_PAD 15 // ECB needs to be padded
#define MAX_CRYPTO_EXCEED (MAX_CRYPTO_EXTRA_DATA + MAX_CRYPTO_PAD)
 
#define OPENSSL_ENCRYPT_ABI_VERSION 1
 
struct openssl_encrypt_info {
        int (*init)(struct openssl_encrypt **state,
                        const char *passphrase);
        void (*destroy)(struct openssl_encrypt *state);
        int (*encrypt)(struct openssl_encrypt *encryption,
                        char *plaintext, int plaintext_len, char *aad, int aad_len, char *ciphertext);
        int (*get_overhead)(struct openssl_encrypt *encryption);
 
        enum openssl_mode (*get_cipher)(struct openssl_encrypt *encryption);
};
 
#endif // OPENSSL_ENCRYPT_H_