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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 || arm64) && !android && !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"
"crypto/internal/fips140"
"internal/stringslite"
"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()
}
func init() {
if fips140.Enabled {
panic("boringcrypto: cannot use GODEBUG=fips140 with GOEXPERIMENT=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
// 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 !stringslite.HasSuffix(name, "_test") && !stringslite.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 BigInt) *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 BigInt) *C.GO_BIGNUM {
return C._goboringcrypto_BN_le2bn(wbase(x), C.size_t(len(x)*wordBytes), nil)
}
func bytesToBN(x []byte) *C.GO_BIGNUM {
return C._goboringcrypto_BN_bin2bn((*C.uint8_t)(&x[0]), C.size_t(len(x)), nil)
}
func bnToBig(bn *C.GO_BIGNUM) BigInt {
x := make(BigInt, (C._goboringcrypto_BN_num_bytes(bn)+wordBytes-1)/wordBytes)
if C._goboringcrypto_BN_bn2le_padded(wbase(x), C.size_t(len(x)*wordBytes), bn) == 0 {
panic("boringcrypto: bignum conversion failed")
}
return x
}
func bigToBn(bnp **C.GO_BIGNUM, b BigInt) 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
}
// noescape hides a pointer from escape analysis. noescape is
// the identity function but escape analysis doesn't think the
// output depends on the input. noescape is inlined and currently
// compiles down to zero instructions.
// USE CAREFULLY!
//
//go:nosplit
func noescape(p unsafe.Pointer) unsafe.Pointer {
x := uintptr(p)
return unsafe.Pointer(x ^ 0)
}
var zero byte
// addr converts p to its base addr, including a noescape along the way.
// If p is nil, addr returns a non-nil pointer, so that the result can always
// be dereferenced.
//
//go:nosplit
func addr(p []byte) *byte {
if len(p) == 0 {
return &zero
}
return (*byte)(noescape(unsafe.Pointer(&p[0])))
}
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