LCOV - code coverage report
Current view: top level - include/crypto - chacha.h (source / functions) Hit Total Coverage
Test: Real Lines: 1 1 100.0 %
Date: 2020-10-17 15:46:16 Functions: 0 0 -
Legend: Neither, QEMU, Real, Both Branches: 0 0 -

           Branch data     Line data    Source code
       1                 :            : /* SPDX-License-Identifier: GPL-2.0 */
       2                 :            : /*
       3                 :            :  * Common values and helper functions for the ChaCha and XChaCha stream ciphers.
       4                 :            :  *
       5                 :            :  * XChaCha extends ChaCha's nonce to 192 bits, while provably retaining ChaCha's
       6                 :            :  * security.  Here they share the same key size, tfm context, and setkey
       7                 :            :  * function; only their IV size and encrypt/decrypt function differ.
       8                 :            :  *
       9                 :            :  * The ChaCha paper specifies 20, 12, and 8-round variants.  In general, it is
      10                 :            :  * recommended to use the 20-round variant ChaCha20.  However, the other
      11                 :            :  * variants can be needed in some performance-sensitive scenarios.  The generic
      12                 :            :  * ChaCha code currently allows only the 20 and 12-round variants.
      13                 :            :  */
      14                 :            : 
      15                 :            : #ifndef _CRYPTO_CHACHA_H
      16                 :            : #define _CRYPTO_CHACHA_H
      17                 :            : 
      18                 :            : #include <crypto/skcipher.h>
      19                 :            : #include <linux/types.h>
      20                 :            : #include <linux/crypto.h>
      21                 :            : 
      22                 :            : /* 32-bit stream position, then 96-bit nonce (RFC7539 convention) */
      23                 :            : #define CHACHA_IV_SIZE          16
      24                 :            : 
      25                 :            : #define CHACHA_KEY_SIZE         32
      26                 :            : #define CHACHA_BLOCK_SIZE       64
      27                 :            : #define CHACHAPOLY_IV_SIZE      12
      28                 :            : 
      29                 :            : /* 192-bit nonce, then 64-bit stream position */
      30                 :            : #define XCHACHA_IV_SIZE         32
      31                 :            : 
      32                 :            : struct chacha_ctx {
      33                 :            :         u32 key[8];
      34                 :            :         int nrounds;
      35                 :            : };
      36                 :            : 
      37                 :            : void chacha_block(u32 *state, u8 *stream, int nrounds);
      38                 :            : static inline void chacha20_block(u32 *state, u8 *stream)
      39                 :            : {
      40                 :          3 :         chacha_block(state, stream, 20);
      41                 :            : }
      42                 :            : void hchacha_block(const u32 *in, u32 *out, int nrounds);
      43                 :            : 
      44                 :            : void crypto_chacha_init(u32 *state, const struct chacha_ctx *ctx, const u8 *iv);
      45                 :            : 
      46                 :            : int crypto_chacha20_setkey(struct crypto_skcipher *tfm, const u8 *key,
      47                 :            :                            unsigned int keysize);
      48                 :            : int crypto_chacha12_setkey(struct crypto_skcipher *tfm, const u8 *key,
      49                 :            :                            unsigned int keysize);
      50                 :            : 
      51                 :            : int crypto_chacha_crypt(struct skcipher_request *req);
      52                 :            : int crypto_xchacha_crypt(struct skcipher_request *req);
      53                 :            : 
      54                 :            : #endif /* _CRYPTO_CHACHA_H */
    

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