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// Copyright (c) 2015-2025 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package rng
// xor32Go will do out[x] = in[x] ^ v[x mod 32]
// len(in) must >= len(out) and length must be a multiple of 32.
func xor32Go(in, out []byte, v *[4]uint64) {
if unsafeEnabled {
// Faster with "unsafe", slower without.
var i int
for len(out)-i >= 32 {
if len(in)-i < 32 {
panic("short input")
}
store64(out, i, v[0]^load64(in, i))
store64(out, i+8, v[1]^load64(in, i+8))
store64(out, i+16, v[2]^load64(in, i+16))
store64(out, i+24, v[3]^load64(in, i+24))
i += 32
}
} else {
for len(out) >= 32 {
inS := in[:32]
v0 := v[0] ^ load64(inS, 0)
v1 := v[1] ^ load64(inS, 8)
v2 := v[2] ^ load64(inS, 16)
v3 := v[3] ^ load64(inS, 24)
store64(out, 0, v0)
store64(out, 8, v1)
store64(out, 16, v2)
store64(out, 24, v3)
out = out[32:]
in = in[32:]
}
}
}
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