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| author | Eric Biggers <ebiggers@google.com> | 2018-01-05 20:09:58 +0100 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2018-01-12 13:03:42 +0100 |
| commit | eb772f37ae8163a89e28a435f6a18742ae06653b (patch) | |
| tree | 3f0561e7ee5d9944f0f7d077ba1168c7d5dfae32 /crypto/salsa20_generic.c | |
| parent | crypto: salsa20-generic - cleanup and convert to skcipher API (diff) | |
| download | linux-eb772f37ae8163a89e28a435f6a18742ae06653b.tar.xz linux-eb772f37ae8163a89e28a435f6a18742ae06653b.zip | |
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 <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/salsa20_generic.c')
| -rw-r--r-- | crypto/salsa20_generic.c | 20 |
1 files changed, 7 insertions, 13 deletions
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 <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, __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, }; |