#include <linux/string.h>
#include <linux/types.h>
+/* Set this bit if the lskcipher operation is a continuation. */
+#define CRYPTO_LSKCIPHER_FLAG_CONT 0x00000001
+/* Set this bit if the lskcipher operation is final. */
+#define CRYPTO_LSKCIPHER_FLAG_FINAL 0x00000002
+/* The bit CRYPTO_TFM_REQ_MAY_SLEEP can also be set if needed. */
+
+/* Set this bit if the skcipher operation is a continuation. */
+#define CRYPTO_SKCIPHER_REQ_CONT 0x00000001
+/* Set this bit if the skcipher operation is not final. */
+#define CRYPTO_SKCIPHER_REQ_NOTFINAL 0x00000002
+
struct scatterlist;
/**
* IV of exactly that size to perform the encrypt or decrypt operation.
* @chunksize: Equal to the block size except for stream ciphers such as
* CTR where it is set to the underlying block size.
+ * @statesize: Size of the internal state for the algorithm.
* @stat: Statistics for cipher algorithm
* @base: Definition of a generic crypto algorithm.
*/
unsigned int max_keysize; \
unsigned int ivsize; \
unsigned int chunksize; \
+ unsigned int statesize; \
\
SKCIPHER_ALG_COMMON_STAT \
\
* be called in parallel with the same transformation object.
* @decrypt: Decrypt a single block. This is a reverse counterpart to @encrypt
* and the conditions are exactly the same.
+ * @export: Export partial state of the transformation. This function dumps the
+ * entire state of the ongoing transformation into a provided block of
+ * data so it can be @import 'ed back later on. This is useful in case
+ * you want to save partial result of the transformation after
+ * processing certain amount of data and reload this partial result
+ * multiple times later on for multiple re-use. No data processing
+ * happens at this point.
+ * @import: Import partial state of the transformation. This function loads the
+ * entire state of the ongoing transformation from a provided block of
+ * data so the transformation can continue from this point onward. No
+ * data processing happens at this point.
* @init: Initialize the cryptographic transformation object. This function
* is used to initialize the cryptographic transformation object.
* This function is called only once at the instantiation time, right
unsigned int keylen);
int (*encrypt)(struct skcipher_request *req);
int (*decrypt)(struct skcipher_request *req);
+ int (*export)(struct skcipher_request *req, void *out);
+ int (*import)(struct skcipher_request *req, const void *in);
int (*init)(struct crypto_skcipher *tfm);
void (*exit)(struct crypto_skcipher *tfm);
* may be left over if length is not a multiple of blocks
* and there is more to come (final == false). The number of
* left-over bytes should be returned in case of success.
+ * The siv field shall be as long as ivsize + statesize with
+ * the IV placed at the front. The state will be used by the
+ * algorithm internally.
* @decrypt: Decrypt a number of bytes. This is a reverse counterpart to
* @encrypt and the conditions are exactly the same.
* @init: Initialize the cryptographic transformation object. This function
int (*setkey)(struct crypto_lskcipher *tfm, const u8 *key,
unsigned int keylen);
int (*encrypt)(struct crypto_lskcipher *tfm, const u8 *src,
- u8 *dst, unsigned len, u8 *iv, bool final);
+ u8 *dst, unsigned len, u8 *siv, u32 flags);
int (*decrypt)(struct crypto_lskcipher *tfm, const u8 *src,
- u8 *dst, unsigned len, u8 *iv, bool final);
+ u8 *dst, unsigned len, u8 *siv, u32 flags);
int (*init)(struct crypto_lskcipher *tfm);
void (*exit)(struct crypto_lskcipher *tfm);
return crypto_lskcipher_alg(tfm)->co.chunksize;
}
+/**
+ * crypto_skcipher_statesize() - obtain state size
+ * @tfm: cipher handle
+ *
+ * Some algorithms cannot be chained with the IV alone. They carry
+ * internal state which must be replicated if data is to be processed
+ * incrementally. The size of that state can be obtained with this
+ * function.
+ *
+ * Return: state size in bytes
+ */
+static inline unsigned int crypto_skcipher_statesize(
+ struct crypto_skcipher *tfm)
+{
+ return crypto_skcipher_alg_common(tfm)->statesize;
+}
+
+/**
+ * crypto_lskcipher_statesize() - obtain state size
+ * @tfm: cipher handle
+ *
+ * Some algorithms cannot be chained with the IV alone. They carry
+ * internal state which must be replicated if data is to be processed
+ * incrementally. The size of that state can be obtained with this
+ * function.
+ *
+ * Return: state size in bytes
+ */
+static inline unsigned int crypto_lskcipher_statesize(
+ struct crypto_lskcipher *tfm)
+{
+ return crypto_lskcipher_alg(tfm)->co.statesize;
+}
+
static inline unsigned int crypto_sync_skcipher_blocksize(
struct crypto_sync_skcipher *tfm)
{
* @src: source buffer
* @dst: destination buffer
* @len: number of bytes to process
- * @iv: IV for the cipher operation which must comply with the IV size defined
- * by crypto_lskcipher_ivsize
- *
+ * @siv: IV + state for the cipher operation. The length of the IV must
+ * comply with the IV size defined by crypto_lskcipher_ivsize. The
+ * IV is then followed with a buffer with the length as specified by
+ * crypto_lskcipher_statesize.
* Encrypt plaintext data using the lskcipher handle.
*
* Return: >=0 if the cipher operation was successful, if positive
* < 0 if an error occurred
*/
int crypto_lskcipher_encrypt(struct crypto_lskcipher *tfm, const u8 *src,
- u8 *dst, unsigned len, u8 *iv);
+ u8 *dst, unsigned len, u8 *siv);
/**
* crypto_lskcipher_decrypt() - decrypt ciphertext
* @src: source buffer
* @dst: destination buffer
* @len: number of bytes to process
- * @iv: IV for the cipher operation which must comply with the IV size defined
- * by crypto_lskcipher_ivsize
+ * @siv: IV + state for the cipher operation. The length of the IV must
+ * comply with the IV size defined by crypto_lskcipher_ivsize. The
+ * IV is then followed with a buffer with the length as specified by
+ * crypto_lskcipher_statesize.
*
* Decrypt ciphertext data using the lskcipher handle.
*
* < 0 if an error occurred
*/
int crypto_lskcipher_decrypt(struct crypto_lskcipher *tfm, const u8 *src,
- u8 *dst, unsigned len, u8 *iv);
+ u8 *dst, unsigned len, u8 *siv);
/**
* DOC: Symmetric Key Cipher Request Handle
projects / linux-2.6-microblaze.git / blobdiff