From: Eric Biggers <ebiggers@xxxxxxxxxx>
Export the Salsa20 constants, transform context, and initialization
functions so that they can be reused by the x86 implementation.
Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
---
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 59f64e041a7f..748d54f74c5c 100644
--- a/crypto/salsa20_generic.c
+++ b/crypto/salsa20_generic.c
@@ -21,17 +21,9 @@
#include <asm/unaligned.h>
#include <crypto/internal/skcipher.h>
+#include <crypto/salsa20.h>
#include <linux/module.h>
-#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, u32 *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 <linux/types.h>
+
+#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 */
--
2.15.1
