From eb772f37ae8163a89e28a435f6a18742ae06653b Mon Sep 17 00:00:00 2001 From: Eric Biggers Date: Fri, 5 Jan 2018 11:09:58 -0800 Subject: [PATCH] crypto: salsa20 - export generic helpers Export the Salsa20 constants, transform context, and initialization functions so that they can be reused by the x86 implementation. Signed-off-by: Eric Biggers Signed-off-by: Herbert Xu --- crypto/salsa20_generic.c | 20 +++++++------------- include/crypto/salsa20.h | 27 +++++++++++++++++++++++++++ 2 files changed, 34 insertions(+), 13 deletions(-) create mode 100644 include/crypto/salsa20.h diff --git a/crypto/salsa20_generic.c b/crypto/salsa20_generic.c index 8c77bc78a09f..5074006a56c3 100644 --- a/crypto/salsa20_generic.c +++ b/crypto/salsa20_generic.c @@ -21,17 +21,9 @@ #include #include +#include #include -#define SALSA20_IV_SIZE 8 -#define SALSA20_MIN_KEY_SIZE 16 -#define SALSA20_MAX_KEY_SIZE 32 -#define SALSA20_BLOCK_SIZE 64 - -struct salsa20_ctx { - u32 initial_state[16]; -}; - static void salsa20_block(u32 *state, __le32 *stream) { u32 x[16]; @@ -101,15 +93,16 @@ static void salsa20_docrypt(u32 *state, u8 *dst, const u8 *src, } } -static void salsa20_init(u32 *state, const struct salsa20_ctx *ctx, +void crypto_salsa20_init(u32 *state, const struct salsa20_ctx *ctx, const u8 *iv) { memcpy(state, ctx->initial_state, sizeof(ctx->initial_state)); state[6] = get_unaligned_le32(iv + 0); state[7] = get_unaligned_le32(iv + 4); } +EXPORT_SYMBOL_GPL(crypto_salsa20_init); -static int salsa20_setkey(struct crypto_skcipher *tfm, const u8 *key, +int crypto_salsa20_setkey(struct crypto_skcipher *tfm, const u8 *key, unsigned int keysize) { static const char sigma[16] = "expand 32-byte k"; @@ -150,6 +143,7 @@ static int salsa20_setkey(struct crypto_skcipher *tfm, const u8 *key, return 0; } +EXPORT_SYMBOL_GPL(crypto_salsa20_setkey); static int salsa20_crypt(struct skcipher_request *req) { @@ -161,7 +155,7 @@ static int salsa20_crypt(struct skcipher_request *req) err = skcipher_walk_virt(&walk, req, true); - salsa20_init(state, ctx, walk.iv); + crypto_salsa20_init(state, ctx, walk.iv); while (walk.nbytes > 0) { unsigned int nbytes = walk.nbytes; @@ -189,7 +183,7 @@ static struct skcipher_alg alg = { .max_keysize = SALSA20_MAX_KEY_SIZE, .ivsize = SALSA20_IV_SIZE, .chunksize = SALSA20_BLOCK_SIZE, - .setkey = salsa20_setkey, + .setkey = crypto_salsa20_setkey, .encrypt = salsa20_crypt, .decrypt = salsa20_crypt, }; diff --git a/include/crypto/salsa20.h b/include/crypto/salsa20.h new file mode 100644 index 000000000000..19ed48aefc86 --- /dev/null +++ b/include/crypto/salsa20.h @@ -0,0 +1,27 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Common values for the Salsa20 algorithm + */ + +#ifndef _CRYPTO_SALSA20_H +#define _CRYPTO_SALSA20_H + +#include + +#define SALSA20_IV_SIZE 8 +#define SALSA20_MIN_KEY_SIZE 16 +#define SALSA20_MAX_KEY_SIZE 32 +#define SALSA20_BLOCK_SIZE 64 + +struct crypto_skcipher; + +struct salsa20_ctx { + u32 initial_state[16]; +}; + +void crypto_salsa20_init(u32 *state, const struct salsa20_ctx *ctx, + const u8 *iv); +int crypto_salsa20_setkey(struct crypto_skcipher *tfm, const u8 *key, + unsigned int keysize); + +#endif /* _CRYPTO_SALSA20_H */