File size: 3,226 Bytes
61bba11 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 | // 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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