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// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build boringcrypto && linux && amd64 && !android && !cmd_go_bootstrap && !msan
// +build boringcrypto,linux,amd64,!android,!cmd_go_bootstrap,!msan
package boring
/*
// goboringcrypto_linux_amd64.syso references pthread functions.
#cgo LDFLAGS: "-pthread"
#include "goboringcrypto.h"
*/
import "C"
import (
"crypto/internal/boring/sig"
_ "crypto/internal/boring/syso"
"math/big"
"math/bits"
"unsafe"
)
const available = true
func init() {
C._goboringcrypto_BORINGSSL_bcm_power_on_self_test()
if C._goboringcrypto_FIPS_mode() != 1 {
panic("boringcrypto: not in FIPS mode")
}
sig.BoringCrypto()
}
// Unreachable marks code that should be unreachable
// when BoringCrypto is in use. It panics.
func Unreachable() {
panic("boringcrypto: invalid code execution")
}
// provided by runtime to avoid os import
func runtime_arg0() string
func hasSuffix(s, t string) bool {
return len(s) > len(t) && s[len(s)-len(t):] == t
}
// UnreachableExceptTests marks code that should be unreachable
// when BoringCrypto is in use. It panics.
func UnreachableExceptTests() {
name := runtime_arg0()
// If BoringCrypto ran on Windows we'd need to allow _test.exe and .test.exe as well.
if !hasSuffix(name, "_test") && !hasSuffix(name, ".test") {
println("boringcrypto: unexpected code execution in", name)
panic("boringcrypto: invalid code execution")
}
}
type fail string
func (e fail) Error() string { return "boringcrypto: " + string(e) + " failed" }
func wbase(b []big.Word) *C.uint8_t {
if len(b) == 0 {
return nil
}
return (*C.uint8_t)(unsafe.Pointer(&b[0]))
}
const wordBytes = bits.UintSize / 8
func bigToBN(x *big.Int) *C.GO_BIGNUM {
raw := x.Bits()
return C._goboringcrypto_BN_le2bn(wbase(raw), C.size_t(len(raw)*wordBytes), nil)
}
func bnToBig(bn *C.GO_BIGNUM) *big.Int {
raw := make([]big.Word, (C._goboringcrypto_BN_num_bytes(bn)+wordBytes-1)/wordBytes)
if C._goboringcrypto_BN_bn2le_padded(wbase(raw), C.size_t(len(raw)*wordBytes), bn) == 0 {
panic("boringcrypto: bignum conversion failed")
}
return new(big.Int).SetBits(raw)
}
func bigToBn(bnp **C.GO_BIGNUM, b *big.Int) bool {
if *bnp != nil {
C._goboringcrypto_BN_free(*bnp)
*bnp = nil
}
if b == nil {
return true
}
bn := bigToBN(b)
if bn == nil {
return false
}
*bnp = bn
return true
}
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