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- // Copyright (c) 2017 Yawning Angel <yawning at schwanenlied dot me>
- //
- // Permission is hereby granted, free of charge, to any person obtaining
- // a copy of this software and associated documentation files (the
- // "Software"), to deal in the Software without restriction, including
- // without limitation the rights to use, copy, modify, merge, publish,
- // distribute, sublicense, and/or sell copies of the Software, and to
- // permit persons to whom the Software is furnished to do so, subject to
- // the following conditions:
- //
- // The above copyright notice and this permission notice shall be
- // included in all copies or substantial portions of the Software.
- //
- // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
- // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
- // BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
- // ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- // CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- // SOFTWARE.
- // +build go1.6
- // +build !gccgo
- // +build amd64
- package bsaes
- //go:noescape
- func cpuidAMD64(cpuidParams *uint32)
- func isCryptoAESSafe() bool {
- return supportsAESNI()
- }
- func supportsAESNI() bool {
- const (
- pclmulBit = 1 << 1
- aesniBit = 1 << 25
- )
- // Check for AES-NI support.
- // CPUID.(EAX=01H, ECX=0H):ECX.AESNI[bit 25]==1
- // ECX.PCLMUL[bit 1]==1
- regs := [4]uint32{0x01}
- cpuidAMD64(®s[0])
- return regs[2]&pclmulBit != 0 && regs[2]&aesniBit != 0
- }
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