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SHA2 uses big-endian, but we use little-endian internally

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So, we need to swap encodings in hash2base()
This commit is contained in:
Frank Denis 2019-05-05 22:50:15 +02:00
parent 53cd7d6a6f
commit c9e8e47049
1 changed files with 6 additions and 4 deletions
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10
src/libsodium/crypto_core/ed25519/ref10/ed25519_ref10.c
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@ -2615,14 +2615,16 @@ ge25519_from_hash(unsigned char s[32], const unsigned char h[64])
int i;
unsigned char x_sign;
x_sign = h[63] & 0x80;
memcpy(fl, &h[0], 32);
memcpy(gl, &h[32], 32);
x_sign = h[0] & 0x80;
for (i = 0; i < 32; i++) {
fl[i] = h[63 - i];
gl[i] = h[31 - i];
}
fl[31] &= 0x7f;
gl[31] &= 0x7f;
fe25519_frombytes(fe_f, fl);
fe25519_frombytes(fe_g, gl);
fe_f[0] += (h[0 + 31] >> 7) * 19;
fe_f[0] += (h[32] >> 7) * 19;
for (i = 0; i < sizeof (fe25519) / sizeof fe_f[0]; i++) {
fe_f[i] += 38 * fe_g[i];
}