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crypto: chacha20 - Export common ChaCha20 helpers

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As architecture specific drivers need a software fallback, export a
ChaCha20 en-/decryption function together with some helpers in a header
file.

Signed-off-by: Martin Willi <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>
This commit is contained in:
Martin Willi 2015-07-16 19:14:00 +02:00 • committed by Herbert Xu
commit 31d7247da5
3 changed files with 38 additions and 18 deletions
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25
include/crypto/chacha20.h Normal file
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/*
* Common values for the ChaCha20 algorithm
*/
#ifndef _CRYPTO_CHACHA20_H
#define _CRYPTO_CHACHA20_H
#include <linux/types.h>
#include <linux/crypto.h>
#define CHACHA20_IV_SIZE 16
#define CHACHA20_KEY_SIZE 32
#define CHACHA20_BLOCK_SIZE 64
struct chacha20_ctx {
u32 key[8];
};
void crypto_chacha20_init(u32 *state, struct chacha20_ctx *ctx, u8 *iv);
int crypto_chacha20_setkey(struct crypto_tfm *tfm, const u8 *key,
unsigned int keysize);
int crypto_chacha20_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
struct scatterlist *src, unsigned int nbytes);
#endif