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crypto_sign_detached(): no need to store a copy of the public key on the stack

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Frank Denis
2015-02-10 13:40:12 +01:00
parent 4723c3d37d
commit 2fb83ade4c
1 changed files with 1 additions and 4 deletions
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src/libsodium/crypto_sign/ed25519/ref10/sign.c
+1 -4
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@@ -13,14 +13,11 @@ crypto_sign_detached(unsigned char *sig, unsigned long long *siglen_p,
const unsigned char *sk)
{
crypto_hash_sha512_state hs;
unsigned char pk[32];
unsigned char az[64];
unsigned char nonce[64];
unsigned char hram[64];
ge_p3 R;
memmove(pk, sk + 32, 32);
crypto_hash_sha512(az, sk, 32);
az[0] &= 248;
az[31] &= 63;
@@ -31,7 +28,7 @@ crypto_sign_detached(unsigned char *sig, unsigned long long *siglen_p,
crypto_hash_sha512_update(&hs, m, mlen);
crypto_hash_sha512_final(&hs, nonce);
memmove(sig + 32, pk, 32);
memmove(sig + 32, sk + 32, 32);
sc_reduce(nonce);
ge_scalarmult_base(&R, nonce);