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Ed25519 synthetic nonces: pad to 128 bytes boundaries, not 16.

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Spotted by Trevor Perrin. Good catch, thanks!
This commit is contained in:
Frank Denis 2017-11-04 09:53:44 +01:00
parent e52ab67322
commit 9f71f5aade
1 changed files with 3 additions and 3 deletions
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6
src/libsodium/crypto_sign/ed25519/ref10/sign.c
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@ -45,16 +45,16 @@ _crypto_sign_ed25519_synthetic_r_hv(crypto_hash_sha512_state *hs,
0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66,
0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66,
};
static const unsigned char zeros[16] = { 0x00 };
static const unsigned char zeros[128] = { 0x00 };
static const unsigned char empty_labelset[3] = { 0x02, 0x00, 0x00 };
crypto_hash_sha512_update(hs, B, 32);
crypto_hash_sha512_update(hs, empty_labelset, 3);
randombytes_buf(Z, 32);
crypto_hash_sha512_update(hs, Z, 32);
crypto_hash_sha512_update(hs, zeros, 16 - (32 + 3 + 32) % 16);
crypto_hash_sha512_update(hs, zeros, 128 - (32 + 3 + 32) % 128);
crypto_hash_sha512_update(hs, sk, 32);
/* empty pad2 */
crypto_hash_sha512_update(hs, zeros, 128 - 32 % 128);
crypto_hash_sha512_update(hs, empty_labelset, 3);
crypto_hash_sha512_update(hs, sk + 32, 32);
/* empty extra */