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-rw-r--r--src/ec25519_secret.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/src/ec25519_secret.c b/src/ec25519_secret.c
index 9108613..7f3d987 100644
--- a/src/ec25519_secret.c
+++ b/src/ec25519_secret.c
@@ -176,12 +176,13 @@ void ecc_25519_secret_mult(ecc_secret_key_256 *out, const ecc_secret_key_256 *in
montgomery(out->s, R, C);
}
-/* TODO implement properly, rule out zero etc. */
void ecc_25519_secret_sanitize(ecc_secret_key_256 *out, const ecc_secret_key_256 *in) {
int i;
for (i = 0; i < 32; i++)
out->s[i] = in->s[i];
- out->s[31] |= 0x80;
+ out->s[0] &= 0xf8;
+ out->s[31] &= 0x7f;
+ out->s[31] |= 0x40;
}