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* Copyright (c) 2002-2006 The OpenSSL Project. All rights reserved.
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* 3. All advertising materials mentioning features or use of this
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#ifndef OPENSSL_HEADER_AES_H
#define OPENSSL_HEADER_AES_H
#include <openssl/base.h>
#if defined(__cplusplus)
extern "C" {
#endif
// Raw AES functions.
#define AES_ENCRYPT 1
#define AES_DECRYPT 0
// AES_MAXNR is the maximum number of AES rounds.
#define AES_MAXNR 14
#define AES_BLOCK_SIZE 16
// aes_key_st should be an opaque type, but EVP requires that the size be
// known.
struct aes_key_st {
uint32_t rd_key[4 * (AES_MAXNR + 1)];
unsigned rounds;
};
typedef struct aes_key_st AES_KEY;
// AES_set_encrypt_key configures |aeskey| to encrypt with the |bits|-bit key,
// |key|.
//
// WARNING: unlike other OpenSSL functions, this returns zero on success and a
// negative number on error.
OPENSSL_EXPORT int AES_set_encrypt_key(const uint8_t *key, unsigned bits,
AES_KEY *aeskey);
// AES_set_decrypt_key configures |aeskey| to decrypt with the |bits|-bit key,
// |key|.
//
// WARNING: unlike other OpenSSL functions, this returns zero on success and a
// negative number on error.
OPENSSL_EXPORT int AES_set_decrypt_key(const uint8_t *key, unsigned bits,
AES_KEY *aeskey);
// AES_encrypt encrypts a single block from |in| to |out| with |key|. The |in|
// and |out| pointers may overlap.
OPENSSL_EXPORT void AES_encrypt(const uint8_t *in, uint8_t *out,
const AES_KEY *key);
// AES_decrypt decrypts a single block from |in| to |out| with |key|. The |in|
// and |out| pointers may overlap.
OPENSSL_EXPORT void AES_decrypt(const uint8_t *in, uint8_t *out,
const AES_KEY *key);
// Block cipher modes.
// AES_ctr128_encrypt encrypts (or decrypts, it's the same in CTR mode) |len|
// bytes from |in| to |out|. The |num| parameter must be set to zero on the
// first call and |ivec| will be incremented.
OPENSSL_EXPORT void AES_ctr128_encrypt(const uint8_t *in, uint8_t *out,
size_t len, const AES_KEY *key,
uint8_t ivec[AES_BLOCK_SIZE],
uint8_t ecount_buf[AES_BLOCK_SIZE],
unsigned int *num);
// AES_ecb_encrypt encrypts (or decrypts, if |enc| == |AES_DECRYPT|) a single,
// 16 byte block from |in| to |out|.
OPENSSL_EXPORT void AES_ecb_encrypt(const uint8_t *in, uint8_t *out,
const AES_KEY *key, const int enc);
// AES_cbc_encrypt encrypts (or decrypts, if |enc| == |AES_DECRYPT|) |len|
// bytes from |in| to |out|. The length must be a multiple of the block size.
OPENSSL_EXPORT void AES_cbc_encrypt(const uint8_t *in, uint8_t *out, size_t len,
const AES_KEY *key, uint8_t *ivec,
const int enc);
// AES_ofb128_encrypt encrypts (or decrypts, it's the same in OFB mode) |len|
// bytes from |in| to |out|. The |num| parameter must be set to zero on the
// first call.
OPENSSL_EXPORT void AES_ofb128_encrypt(const uint8_t *in, uint8_t *out,
size_t len, const AES_KEY *key,
uint8_t *ivec, int *num);
// AES_cfb128_encrypt encrypts (or decrypts, if |enc| == |AES_DECRYPT|) |len|
// bytes from |in| to |out|. The |num| parameter must be set to zero on the
// first call.
OPENSSL_EXPORT void AES_cfb128_encrypt(const uint8_t *in, uint8_t *out,
size_t len, const AES_KEY *key,
uint8_t *ivec, int *num, int enc);
// AES key wrap.
//
// These functions implement AES Key Wrap mode, as defined in RFC 3394. They
// should never be used except to interoperate with existing systems that use
// this mode.
// AES_wrap_key performs AES key wrap on |in| which must be a multiple of 8
// bytes. |iv| must point to an 8 byte value or be NULL to use the default IV.
// |key| must have been configured for encryption. On success, it writes
// |in_len| + 8 bytes to |out| and returns |in_len| + 8. Otherwise, it returns
// -1.
OPENSSL_EXPORT int AES_wrap_key(const AES_KEY *key, const uint8_t *iv,
uint8_t *out, const uint8_t *in, size_t in_len);
// AES_unwrap_key performs AES key unwrap on |in| which must be a multiple of 8
// bytes. |iv| must point to an 8 byte value or be NULL to use the default IV.
// |key| must have been configured for decryption. On success, it writes
// |in_len| - 8 bytes to |out| and returns |in_len| - 8. Otherwise, it returns
// -1.
OPENSSL_EXPORT int AES_unwrap_key(const AES_KEY *key, const uint8_t *iv,
uint8_t *out, const uint8_t *in,
size_t in_len);
#if defined(__cplusplus)
} // extern C
#endif
#endif // OPENSSL_HEADER_AES_H