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![Manu Kumar](/assets/img/avatar_default.png)
Added white space between operators and operands. Because this sometimes maxed out the column width, some expressions were broken up into multiple lines, and comments were moved appropriately. Signed-off-by: Manu Kumar <maraku@gmx.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
170 lines
4.9 KiB
C
170 lines
4.9 KiB
C
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#ifndef THREEFISHAPI_H
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#define THREEFISHAPI_H
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/**
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* @file threefish_api.h
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* @brief A Threefish cipher API and its functions.
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* @{
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*
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* This API and the functions that implement this API simplify the usage
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* of the Threefish cipher. The design and the way to use the functions
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* follow the openSSL design but at the same time take care of some Threefish
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* specific behaviour and possibilities.
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*
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* These are the low level functions that deal with Threefish blocks only.
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* Implementations for cipher modes such as ECB, CFB, or CBC may use these
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* functions.
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*
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@code
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// Threefish cipher context data
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struct threefish_key key_ctx;
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// Initialize the context
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threefish_set_key(&key_ctx, THREEFISH_512, key, tweak);
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// Encrypt
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threefish_encrypt_block_bytes(&key_ctx, input, cipher);
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@endcode
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*/
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#include <linux/types.h>
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#include "skein_base.h"
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#define KEY_SCHEDULE_CONST 0x1BD11BDAA9FC1A22L
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/**
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* Which Threefish size to use
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*/
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enum threefish_size {
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THREEFISH_256 = 256, /*!< Skein with 256 bit state */
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THREEFISH_512 = 512, /*!< Skein with 512 bit state */
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THREEFISH_1024 = 1024 /*!< Skein with 1024 bit state */
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};
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/**
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* Context for Threefish key and tweak words.
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*
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* This structure was setup with some know-how of the internal
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* Skein structures, in particular ordering of header and size dependent
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* variables. If Skein implementation changes this, the adapt these
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* structures as well.
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*/
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struct threefish_key {
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u64 state_size;
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u64 key[SKEIN_MAX_STATE_WORDS + 1]; /* max number of key words*/
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u64 tweak[3];
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};
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/**
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* Set Threefish key and tweak data.
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*
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* This function sets the key and tweak data for the Threefish cipher of
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* the given size. The key data must have the same length (number of bits)
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* as the state size
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*
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* @param key_ctx
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* Pointer to a Threefish key structure.
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* @param size
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* Which Skein size to use.
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* @param key_data
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* Pointer to the key words (word has 64 bits).
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* @param tweak
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* Pointer to the two tweak words (word has 64 bits).
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*/
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void threefish_set_key(struct threefish_key *key_ctx,
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enum threefish_size state_size,
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u64 *key_data, u64 *tweak);
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/**
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* Encrypt Threefish block (bytes).
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*
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* The buffer must have at least the same length (number of bits) as the
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* state size for this key. The function uses the first @c state_size bits
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* of the input buffer, encrypts them and stores the result in the output
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* buffer.
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*
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* @param key_ctx
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* Pointer to a Threefish key structure.
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* @param in
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* Poionter to plaintext data buffer.
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* @param out
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* Pointer to cipher buffer.
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*/
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void threefish_encrypt_block_bytes(struct threefish_key *key_ctx, u8 *in,
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u8 *out);
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/**
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* Encrypt Threefish block (words).
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*
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* The buffer must have at least the same length (number of bits) as the
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* state size for this key. The function uses the first @c state_size bits
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* of the input buffer, encrypts them and stores the result in the output
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* buffer.
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*
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* The wordsize ist set to 64 bits.
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*
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* @param key_ctx
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* Pointer to a Threefish key structure.
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* @param in
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* Poionter to plaintext data buffer.
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* @param out
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* Pointer to cipher buffer.
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*/
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void threefish_encrypt_block_words(struct threefish_key *key_ctx, u64 *in,
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u64 *out);
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/**
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* Decrypt Threefish block (bytes).
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*
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* The buffer must have at least the same length (number of bits) as the
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* state size for this key. The function uses the first @c state_size bits
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* of the input buffer, decrypts them and stores the result in the output
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* buffer
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*
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* @param key_ctx
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* Pointer to a Threefish key structure.
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* @param in
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* Poionter to cipher data buffer.
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* @param out
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* Pointer to plaintext buffer.
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*/
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void threefish_decrypt_block_bytes(struct threefish_key *key_ctx, u8 *in,
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u8 *out);
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/**
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* Decrypt Threefish block (words).
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*
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* The buffer must have at least the same length (number of bits) as the
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* state size for this key. The function uses the first @c state_size bits
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* of the input buffer, encrypts them and stores the result in the output
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* buffer.
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*
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* The wordsize ist set to 64 bits.
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*
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* @param key_ctx
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* Pointer to a Threefish key structure.
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* @param in
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* Poionter to cipher data buffer.
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* @param out
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* Pointer to plaintext buffer.
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*/
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void threefish_decrypt_block_words(struct threefish_key *key_ctx, u64 *in,
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u64 *out);
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void threefish_encrypt_256(struct threefish_key *key_ctx, u64 *input,
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u64 *output);
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void threefish_encrypt_512(struct threefish_key *key_ctx, u64 *input,
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u64 *output);
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void threefish_encrypt_1024(struct threefish_key *key_ctx, u64 *input,
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u64 *output);
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void threefish_decrypt_256(struct threefish_key *key_ctx, u64 *input,
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u64 *output);
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void threefish_decrypt_512(struct threefish_key *key_ctx, u64 *input,
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u64 *output);
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void threefish_decrypt_1024(struct threefish_key *key_ctx, u64 *input,
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u64 *output);
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/**
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* @}
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*/
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#endif
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