Applied OpenSSL: CTR Mode in File Encryption

/* crypto/aes/aes.h -*- mode:C; c-file-style: "eay" -*- */
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#ifndef HEADER_AES_H
#define HEADER_AES_H

#include <openssl/opensslconf.h>

#ifdef OPENSSL_NO_AES
#error AES is disabled.
#endif

#include <stddef.h>

#define AES_ENCRYPT	1
#define AES_DECRYPT	0

/* Because array size can't be a const in C, the following two are macros.
   Both sizes are in bytes. */
#define AES_MAXNR 14
#define AES_BLOCK_SIZE 16

#ifdef  __cplusplus
extern "C" {
#endif

/* This should be a hidden type, but EVP requires that the size be known */
struct aes_key_st {
#ifdef AES_LONG
    unsigned long rd_key[4 *(AES_MAXNR + 1)];
#else
    unsigned int rd_key[4 *(AES_MAXNR + 1)];
#endif
    int rounds;
};
typedef struct aes_key_st AES_KEY;

const char *AES_options(void);

int AES_set_encrypt_key(const unsigned char *userKey, const int bits,
	AES_KEY *key);
int AES_set_decrypt_key(const unsigned char *userKey, const int bits,
	AES_KEY *key);

void AES_encrypt(const unsigned char *in, unsigned char *out,
	const AES_KEY *key);
void AES_decrypt(const unsigned char *in, unsigned char *out,
	const AES_KEY *key);

void AES_ecb_encrypt(const unsigned char *in, unsigned char *out,
	const AES_KEY *key, const int enc);
void AES_cbc_encrypt(const unsigned char *in, unsigned char *out,
	size_t length, const AES_KEY *key,
	unsigned char *ivec, const int enc);
void AES_cfb128_encrypt(const unsigned char *in, unsigned char *out,
	size_t length, const AES_KEY *key,
	unsigned char *ivec, int *num, const int enc);
void AES_cfb1_encrypt(const unsigned char *in, unsigned char *out,
	size_t length, const AES_KEY *key,
	unsigned char *ivec, int *num, const int enc);
void AES_cfb8_encrypt(const unsigned char *in, unsigned char *out,
	size_t length, const AES_KEY *key,
	unsigned char *ivec, int *num, const int enc);
void AES_ofb128_encrypt(const unsigned char *in, unsigned char *out,
	size_t length, const AES_KEY *key,
	unsigned char *ivec, int *num);
void AES_ctr128_encrypt(const unsigned char *in, unsigned char *out,
	size_t length, const AES_KEY *key,
	unsigned char ivec[AES_BLOCK_SIZE],
	unsigned char ecount_buf[AES_BLOCK_SIZE],
	unsigned int *num);

#ifdef  __cplusplus
}
#endif

#endif /* !HEADER_AES_H */