It doesn't need a second input or a length parameter.
Signed-off-by: George Spelvin <[email protected]>
---
crypto/ansi_cprng.c | 13 ++++++-------
1 file changed, 6 insertions(+), 7 deletions(-)
diff --git a/crypto/ansi_cprng.c b/crypto/ansi_cprng.c
index a8cf98a5..f345b575 100644
--- a/crypto/ansi_cprng.c
+++ b/crypto/ansi_cprng.c
@@ -63,15 +63,14 @@ if (dbg)\
printk(format, ##args);\
} while (0)
-static void xor_vectors(const u8 *in1, const u8 *in2,
- u8 *out, unsigned int size)
+static void xor_block(const u8 in[DEFAULT_BLK_SZ], u8 out[DEFAULT_BLK_SZ])
{
int i;
- for (i = 0; i < size; i++)
- out[i] = in1[i] ^ in2[i];
-
+ for (i = 0; i < DEFAULT_BLK_SZ; i++)
+ out[i] ^= in[i];
}
+
/*
* Returns DEFAULT_BLK_SZ bytes of random data per call
* returns 0 if generation succeeded, <0 if something went wrong
@@ -100,7 +99,7 @@ static int _get_more_prng_bytes(struct prng_context *ctx,
bool cont_test)
* keep that output in ctx->V for the moment; we need the
* previous rand_data for ons more thing.
*/
- xor_vectors(tmp, ctx->V, ctx->V, DEFAULT_BLK_SZ);
+ xor_block(tmp, ctx->V);
hexdump("V^I", ctx->V);
crypto_cipher_encrypt_one(ctx->tfm, ctx->V, ctx->V);
hexdump("R", ctx->V);
@@ -128,7 +127,7 @@ static int _get_more_prng_bytes(struct prng_context *ctx,
bool cont_test)
* Lastly xor the random data with I and encrypt that to obtain
* a new secret vector V.
*/
- xor_vectors(tmp, ctx->V, ctx->V, DEFAULT_BLK_SZ);
+ xor_block(tmp, ctx->V);
hexdump("R^I", ctx->V);
memzero_explicit(tmp, DEFAULT_BLK_SZ);
crypto_cipher_encrypt_one(ctx->tfm, ctx->V, ctx->V);
--
2.1.3
--
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