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//go:build windows
// +build windows
package capi
import (
"bytes"
"crypto"
"crypto/elliptic"
"crypto/sha1"
"encoding/binary"
"errors"
"fmt"
"unsafe"
"golang.org/x/sys/windows"
)
const (
// Key storage properties
NCRYPT_ALGORITHM_GROUP_PROPERTY = "Algorithm Group"
NCRYPT_LENGTH_PROPERTY = "Length"
NCRYPT_KEY_TYPE_PROPERTY = "Key Type"
NCRYPT_UNIQUE_NAME_PROPERTY = "Unique Name"
NCRYPT_ECC_CURVE_NAME_PROPERTY = "ECCCurveName"
NCRYPT_IMPL_TYPE_PROPERTY = "Impl Type"
NCRYPT_PROV_HANDLE = "Provider Handle"
NCRYPT_PIN_PROPERTY = "SmartCardPin"
NCRYPT_SECURE_PIN_PROPERTY = "SmartCardSecurePin"
NCRYPT_READER_PROPERTY = "SmartCardReader"
NCRYPT_ALGORITHM_PROPERTY = "Algorithm Name"
NCRYPT_PCP_USAGE_AUTH_PROPERTY = "PCP_USAGEAUTH"
// Key Storage Flags
NCRYPT_MACHINE_KEY_FLAG = 0x00000001
// Errors
NTE_NOT_SUPPORTED = uint32(0x80090029)
NTE_INVALID_PARAMETER = uint32(0x80090027)
NTE_BAD_FLAGS = uint32(0x80090009)
NTE_NO_MORE_ITEMS = uint32(0x8009002A)
NTE_BAD_KEYSET = uint32(0x80090016)
SCARD_W_CANCELLED_BY_USER = uint32(0x8010006E)
// wincrypt.h constants
acquireCached = 0x1 // CRYPT_ACQUIRE_CACHE_FLAG
acquireSilent = 0x40 // CRYPT_ACQUIRE_SILENT_FLAG
encodingX509ASN = 1 // X509_ASN_ENCODING
encodingPKCS7 = 65536 // PKCS_7_ASN_ENCODING
certStoreProvSystem = 10 // CERT_STORE_PROV_SYSTEM
certStoreOpenExisting = 0x00004000 // CERT_STORE_OPEN_EXISTING_FLAG
certStoreCurrentUser = uint32(certStoreCurrentUserID << compareShift) // CERT_SYSTEM_STORE_CURRENT_USER
certStoreLocalMachine = uint32(certStoreLocalMachineID << compareShift) // CERT_SYSTEM_STORE_LOCAL_MACHINE
certStoreCurrentUserID = 1 // CERT_SYSTEM_STORE_CURRENT_USER_ID
certStoreLocalMachineID = 2 // CERT_SYSTEM_STORE_LOCAL_MACHINE_ID
infoIssuerFlag = 4 // CERT_INFO_ISSUER_FLAG
compareName = 2 // CERT_COMPARE_NAME
compareNameStrW = 8 // CERT_COMPARE_NAME_STR_A
compareShift = 16 // CERT_COMPARE_SHIFT
compareSHA1Hash = 1 // CERT_COMPARE_SHA1_HASH
compareCertID = 16 // CERT_COMPARE_CERT_ID
findIssuerStr = compareNameStrW<<compareShift | infoIssuerFlag // CERT_FIND_ISSUER_STR_W
findIssuerName = compareName<<compareShift | infoIssuerFlag // CERT_FIND_ISSUER_NAME
findHash = compareSHA1Hash << compareShift // CERT_FIND_HASH
findCertID = compareCertID << compareShift // CERT_FIND_CERT_ID
signatureKeyUsage = 0x80 // CERT_DIGITAL_SIGNATURE_KEY_USAGE
ncryptKeySpec = 0xFFFFFFFF // CERT_NCRYPT_KEY_SPEC
BCRYPT_RSAPUBLIC_BLOB = "RSAPUBLICBLOB"
BCRYPT_ECCPUBLIC_BLOB = "ECCPUBLICBLOB"
// winerror.h constants
CRYPT_E_NOT_FOUND = uint32(0x80092004)
CRYPT_ACQUIRE_ALLOW_NCRYPT_KEY_FLAG = uint32(0x00010000)
CRYPT_ACQUIRE_PREFER_NCRYPT_KEY_FLAG = uint32(0x00020000)
CRYPT_ACQUIRE_ONLY_NCRYPT_KEY_FLAG = uint32(0x00040000)
CERT_ID_ISSUER_SERIAL_NUMBER = uint32(1)
CERT_ID_KEY_IDENTIFIER = uint32(2)
CERT_ID_SHA1_HASH = uint32(3)
CERT_KEY_PROV_INFO_PROP_ID = uint32(2)
CERT_NAME_STR_COMMA_FLAG = uint32(0x04000000)
CERT_SIMPLE_NAME_STR = uint32(1)
CERT_X500_NAME_STR = uint32(3)
AT_KEYEXCHANGE = uint32(1)
AT_SIGNATURE = uint32(2)
// Legacy CryptoAPI flags
bCryptPadPKCS1 = uint32(2)
bCryptPadPSS = uint32(8)
// Magic numbers for public key blobs.
rsa1Magic = 0x31415352 // "RSA1" BCRYPT_RSAPUBLIC_MAGIC
ecs1Magic = 0x31534345 // "ECS1" BCRYPT_ECDSA_PUBLIC_P256_MAGIC
ecs3Magic = 0x33534345 // "ECS3" BCRYPT_ECDSA_PUBLIC_P384_MAGIC
ecs5Magic = 0x35534345 // "ECS5" BCRYPT_ECDSA_PUBLIC_P521_MAGIC
ALG_RSA = "RSA"
ALG_ECDSA_P256 = "ECDSA_P256"
ALG_ECDSA_P384 = "ECDSA_P384"
ALG_ECDSA_P521 = "ECDSA_P521"
ProviderMSKSP = "Microsoft Software Key Storage Provider"
ProviderMSSC = "Microsoft Smart Card Key Storage Provider"
ProviderMSPCP = "Microsoft Platform Crypto Provider"
)
var (
// curveNames maps bcrypt.h curve names to elliptic curves.
curveNames = map[string]elliptic.Curve{
ALG_ECDSA_P256: elliptic.P256(),
ALG_ECDSA_P384: elliptic.P384(),
ALG_ECDSA_P521: elliptic.P521(),
"nistP256": elliptic.P256(), // BCRYPT_ECC_CURVE_NISTP256
"nistP384": elliptic.P384(), // BCRYPT_ECC_CURVE_NISTP384
"nistP521": elliptic.P521(), // BCRYPT_ECC_CURVE_NISTP521
}
curveMagicMap = map[string]uint32{
"P-256": ecs1Magic,
"P-384": ecs3Magic,
"P-521": ecs5Magic,
}
// algIDs maps crypto.Hash values to bcrypt.h constants.
hashAlgorithms = map[crypto.Hash]string{
crypto.SHA1: "SHA1", // BCRYPT_SHA1_ALGORITHM
crypto.SHA256: "SHA256", // BCRYPT_SHA256_ALGORITHM
crypto.SHA384: "SHA384", // BCRYPT_SHA384_ALGORITHM
crypto.SHA512: "SHA512", // BCRYPT_SHA512_ALGORITHM
}
nCrypt = windows.MustLoadDLL("ncrypt.dll")
procNCryptCreatePersistedKey = nCrypt.MustFindProc("NCryptCreatePersistedKey")
procNCryptExportKey = nCrypt.MustFindProc("NCryptExportKey")
procNCryptFinalizeKey = nCrypt.MustFindProc("NCryptFinalizeKey")
procNCryptFreeObject = nCrypt.MustFindProc("NCryptFreeObject")
procNCryptOpenKey = nCrypt.MustFindProc("NCryptOpenKey")
procNCryptOpenStorageProvider = nCrypt.MustFindProc("NCryptOpenStorageProvider")
procNCryptGetProperty = nCrypt.MustFindProc("NCryptGetProperty")
procNCryptSetProperty = nCrypt.MustFindProc("NCryptSetProperty")
procNCryptSignHash = nCrypt.MustFindProc("NCryptSignHash")
crypt32 = windows.MustLoadDLL("crypt32.dll")
procCertFindCertificateInStore = crypt32.MustFindProc("CertFindCertificateInStore")
procCryptFindCertificateKeyProvInfo = crypt32.MustFindProc("CryptFindCertificateKeyProvInfo")
procCertGetCertificateContextProperty = crypt32.MustFindProc("CertGetCertificateContextProperty")
procCertStrToName = crypt32.MustFindProc("CertStrToNameW")
)
type BCRYPT_PKCS1_PADDING_INFO struct {
pszAlgID *uint16
}
type BCRYPT_PSS_PADDING_INFO struct {
pszAlgID *uint16
cbSalt uint32
}
// CRYPTOAPI_BLOB -- https://learn.microsoft.com/en-us/previous-versions/windows/desktop/legacy/aa381414(v=vs.85)
type CRYPTOAPI_BLOB struct {
len uint32
data uintptr
}
// CERT_ISSUER_SERIAL_NUMBER -- https://learn.microsoft.com/en-us/windows/win32/api/wincrypt/ns-wincrypt-cert_issuer_serial_number
type CERT_ISSUER_SERIAL_NUMBER struct {
Issuer CRYPTOAPI_BLOB
SerialNumber CRYPTOAPI_BLOB
}
// CERT_ID - https://learn.microsoft.com/en-us/windows/win32/api/wincrypt/ns-wincrypt-cert_id
// TODO: might be able to merge these two types into one that uses interface{} instead
type CERT_ID_KEYIDORHASH struct {
idChoice uint32
KeyIDOrHash CRYPTOAPI_BLOB
}
type CERT_ID_SERIAL struct {
idChoice uint32
Serial CERT_ISSUER_SERIAL_NUMBER
}
type CRYPT_KEY_PROV_INFO struct {
pwszContainerName int
pwszProvName int
dwProvType int
dwFlags int
cProvParam int
rgProvParam int
dwKeySpec int
}
func errNoToStr(e uint32) string {
switch e {
case NTE_INVALID_PARAMETER:
return "NTE_INVALID_PARAMETER"
case NTE_BAD_FLAGS:
return "NTE_BAD_FLAGS"
case NTE_BAD_KEYSET:
return "NTE_BAD_KEYSET"
case NTE_NO_MORE_ITEMS:
return "NTE_NO_MORE_ITEMS"
case NTE_NOT_SUPPORTED:
return "NTE_NOT_SUPPORTED"
case SCARD_W_CANCELLED_BY_USER:
return "User cancelled smartcard action"
default:
return fmt.Sprintf("0x%X", e)
}
}
// wide returns a pointer to a uint16 representing the equivalent
// to a Windows LPCWSTR.
func wide(s string) *uint16 {
w, _ := windows.UTF16PtrFromString(s)
return w
}
func nCryptOpenStorageProvider(provider string) (uintptr, error) {
var hProv uintptr
// Open the provider, the last parameter is not used
r, _, _ := procNCryptOpenStorageProvider.Call(
uintptr(unsafe.Pointer(&hProv)),
uintptr(unsafe.Pointer(wide(provider))),
0)
if r == 0 {
return hProv, nil
}
return hProv, fmt.Errorf("NCryptOpenStorageProvider returned %v", errNoToStr(uint32(r)))
}
func nCryptFreeObject(h uintptr) error {
r, _, err := procNCryptFreeObject.Call(h)
if !errors.Is(err, windows.Errno(0)) {
return fmt.Errorf("NCryptFreeObject returned %w", err)
}
if r == 0 {
return nil
}
return fmt.Errorf("NCryptFreeObject returned %v", errNoToStr(uint32(r)))
}
func nCryptCreatePersistedKey(provisionerHandle uintptr, containerName, algorithmName string, legacyKeySpec, flags uint32) (uintptr, error) {
var kh uintptr
var kn uintptr
if containerName != "" {
kn = uintptr(unsafe.Pointer(wide(containerName)))
}
r, _, _ := procNCryptCreatePersistedKey.Call(
provisionerHandle,
uintptr(unsafe.Pointer(&kh)),
uintptr(unsafe.Pointer(wide(algorithmName))),
kn,
uintptr(legacyKeySpec),
uintptr(flags))
if r != 0 {
return 0, fmt.Errorf("NCryptCreatePersistedKey returned %v", errNoToStr(uint32(r)))
}
return kh, nil
}
func nCryptOpenKey(provisionerHandle uintptr, containerName string, legacyKeySpec, flags uint32) (uintptr, error) {
var kh uintptr
r, _, err := procNCryptOpenKey.Call(
provisionerHandle,
uintptr(unsafe.Pointer(&kh)),
uintptr(unsafe.Pointer(wide(containerName))),
uintptr(legacyKeySpec),
uintptr(flags))
// nCrypt sometimes returns error 1008 for keys that actually exist
if !errors.Is(err, windows.Errno(0)) && !errors.Is(err, windows.Errno(1008)) {
return 0, fmt.Errorf("NCryptOpenKey returned %w %d", err, err)
}
if r != 0 {
return 0, fmt.Errorf("NCryptOpenKey for container %q returned %v", containerName, errNoToStr(uint32(r)))
}
return kh, nil
}
func nCryptFinalizeKey(keyHandle uintptr, flags uint32) error {
r, _, err := procNCryptFinalizeKey.Call(keyHandle, uintptr(flags))
if !errors.Is(err, windows.Errno(0)) {
return fmt.Errorf("NCryptFinalizeKey returned %w", err)
}
if r != 0 {
return fmt.Errorf("NCryptFinalizeKey returned %v", errNoToStr(uint32(r)))
}
return nil
}
func nCryptSetProperty(keyHandle uintptr, propertyName string, propertyValue interface{}, flags uint32) error {
var valLen int
var valPtr uintptr
if intVal, isInt := propertyValue.(uint32); isInt {
valLen = 4
valPtr = uintptr(unsafe.Pointer(&intVal))
} else if strVal, isStr := propertyValue.(string); isStr {
valPtr = uintptr(unsafe.Pointer(wide(strVal)))
valLen = len(strVal)
} else if bytesVal, isBytes := propertyValue.([]byte); isBytes {
valPtr = uintptr(unsafe.Pointer(&bytesVal[0]))
valLen = len(bytesVal)
} else {
return fmt.Errorf("NCryptSetProperty %v invalid value type %T", propertyName, propertyValue)
}
r, _, err := procNCryptSetProperty.Call(
keyHandle,
uintptr(unsafe.Pointer(wide(propertyName))),
valPtr,
uintptr(valLen),
uintptr(flags))
if !errors.Is(err, windows.Errno(0)) {
return fmt.Errorf("NCryptSetProperty returned %w", err)
}
if r != 0 {
return fmt.Errorf("NCryptSetProperty \"%v\" returned %X", propertyName, errNoToStr(uint32(r)))
}
return nil
}
func nCryptSignHash(kh uintptr, digest []byte, hashID string, saltLength int) ([]byte, error) {
var size uint32
var padInfoPtr uintptr
var flags uint32
if hashID != "" {
if saltLength != 0 {
padInfo := BCRYPT_PSS_PADDING_INFO{pszAlgID: wide(hashID), cbSalt: uint32(saltLength)}
padInfoPtr = uintptr(unsafe.Pointer(&padInfo))
flags = bCryptPadPSS
} else {
padInfo := BCRYPT_PKCS1_PADDING_INFO{pszAlgID: wide(hashID)}
padInfoPtr = uintptr(unsafe.Pointer(&padInfo))
flags = bCryptPadPKCS1
}
} else {
padInfoPtr = 0
flags = 0
}
// Obtain the size of the signature
r, _, err := procNCryptSignHash.Call(
kh,
padInfoPtr,
uintptr(unsafe.Pointer(&digest[0])),
uintptr(len(digest)),
0,
0,
uintptr(unsafe.Pointer(&size)),
uintptr(flags))
if !errors.Is(err, windows.Errno(0)) {
return nil, fmt.Errorf("NCryptSignHash returned %w", err)
}
if r != 0 {
return nil, fmt.Errorf("NCryptSignHash returned %v during size check", errNoToStr(uint32(r)))
}
// Obtain the signature data
buf := make([]byte, size)
r, _, err = procNCryptSignHash.Call(
kh,
padInfoPtr,
uintptr(unsafe.Pointer(&digest[0])),
uintptr(len(digest)),
uintptr(unsafe.Pointer(&buf[0])),
uintptr(size),
uintptr(unsafe.Pointer(&size)),
uintptr(flags),
)
if !errors.Is(err, windows.Errno(0)) {
return nil, fmt.Errorf("NCryptSignHash returned %w", err)
}
if r != 0 {
return nil, fmt.Errorf("NCryptSignHash returned %v during signing", errNoToStr(uint32(r)))
}
return buf[:size], nil
}
func getProperty(kh uintptr, property *uint16) ([]byte, error) {
var strSize uint32
r, _, err := procNCryptGetProperty.Call(
kh,
uintptr(unsafe.Pointer(property)),
0,
0,
uintptr(unsafe.Pointer(&strSize)),
0,
0)
if !errors.Is(err, windows.Errno(0)) {
return nil, fmt.Errorf("NCryptGetProperty(%v) returned %w", property, err)
}
if r != 0 {
return nil, fmt.Errorf("NCryptGetProperty(%v) returned %v during size check", property, errNoToStr(uint32(r)))
}
buf := make([]byte, strSize)
r, _, err = procNCryptGetProperty.Call(
kh,
uintptr(unsafe.Pointer(property)),
uintptr(unsafe.Pointer(&buf[0])),
uintptr(strSize),
uintptr(unsafe.Pointer(&strSize)),
0,
0)
if !errors.Is(err, windows.Errno(0)) {
return nil, fmt.Errorf("NCryptGetProperty(%v) returned %w", property, err)
}
if r != 0 {
return nil, fmt.Errorf("NCryptGetProperty %v returned %v during export", property, errNoToStr(uint32(r)))
}
return buf, nil
}
func nCryptGetPropertyHandle(kh uintptr, property *uint16) (uintptr, error) {
buf, err := getProperty(kh, property)
if err != nil {
return 0, err
}
if len(buf) < 1 {
return 0, fmt.Errorf("empty result")
}
return **(**uintptr)(unsafe.Pointer(&buf)), nil
}
func nCryptGetPropertyInt(kh uintptr, property *uint16) (int, error) {
buf, err := getProperty(kh, property)
if err != nil {
return 0, err
}
if len(buf) < 1 {
return 0, fmt.Errorf("empty result")
}
return **(**int)(unsafe.Pointer(&buf)), nil
}
func nCryptGetPropertyStr(kh uintptr, property string) (string, error) {
buf, err := getProperty(kh, wide(property))
if err != nil {
return "", err
}
uc := bytes.ReplaceAll(buf, []byte{0x00}, []byte(""))
return string(uc), nil
}
func nCryptExportKey(kh uintptr, blobType string) ([]byte, error) {
var size uint32
// When obtaining the size of a public key, most parameters are not required
r, _, err := procNCryptExportKey.Call(
kh,
0,
uintptr(unsafe.Pointer(wide(blobType))),
0,
0,
0,
uintptr(unsafe.Pointer(&size)),
0)
if !errors.Is(err, windows.Errno(0)) {
return nil, fmt.Errorf("nCryptExportKey returned %w", err)
}
if r != 0 {
return nil, fmt.Errorf("NCryptExportKey returned %v during size check", errNoToStr(uint32(r)))
}
// Place the exported key in buf now that we know the size required
buf := make([]byte, size)
r, _, err = procNCryptExportKey.Call(
kh,
0,
uintptr(unsafe.Pointer(wide(blobType))),
0,
uintptr(unsafe.Pointer(&buf[0])),
uintptr(size),
uintptr(unsafe.Pointer(&size)),
0)
if !errors.Is(err, windows.Errno(0)) {
return nil, fmt.Errorf("nCryptExportKey returned %w", err)
}
if r != 0 {
return nil, fmt.Errorf("NCryptExportKey returned %v during export", errNoToStr(uint32(r)))
}
return buf, nil
}
func findCertificateInStore(store windows.Handle, enc, findFlags, findType uint32, para uintptr, prev *windows.CertContext) (*windows.CertContext, error) {
h, _, err := procCertFindCertificateInStore.Call(
uintptr(store),
uintptr(enc),
uintptr(findFlags),
uintptr(findType),
para,
uintptr(unsafe.Pointer(prev)),
)
if h == 0 {
// Actual error, or simply not found?
if errno, ok := err.(windows.Errno); ok && uint32(errno) == CRYPT_E_NOT_FOUND {
return nil, nil
}
return nil, err
}
return (*windows.CertContext)(unsafe.Pointer(h)), nil
}
func cryptFindCertificateKeyProvInfo(certContext *windows.CertContext) error {
r, _, err := procCryptFindCertificateKeyProvInfo.Call(
uintptr(unsafe.Pointer(certContext)),
uintptr(CRYPT_ACQUIRE_PREFER_NCRYPT_KEY_FLAG),
0,
)
if !errors.Is(err, windows.Errno(0)) {
return fmt.Errorf("CryptFindCertificateKeyProvInfo returned %w", err)
}
if r == 0 {
return fmt.Errorf("private key association failed: %v", errNoToStr(uint32(r)))
}
return nil
}
func cryptFindCertificatePrivateKey(certContext *windows.CertContext) (uintptr, error) {
var (
kh windows.Handle
keySpec uint32
free bool
)
if err := windows.CryptAcquireCertificatePrivateKey(certContext, windows.CRYPT_ACQUIRE_ONLY_NCRYPT_KEY_FLAG, nil, &kh, &keySpec, &free); err != nil {
return uintptr(0), err
}
return uintptr(kh), nil
}
func cryptFindCertificateKeyContainerName(certContext *windows.CertContext) (string, error) {
var (
length uint32
provInfo *CRYPT_KEY_PROV_INFO
)
r1, _, err := procCertGetCertificateContextProperty.Call(
uintptr(unsafe.Pointer(certContext)),
uintptr(CERT_KEY_PROV_INFO_PROP_ID),
uintptr(0),
uintptr(unsafe.Pointer(&length)),
)
if !errors.Is(err, windows.Errno(0)) {
return "", fmt.Errorf("CertGetCertificateContextProperty returned %w", err)
}
if r1 == 0 {
return "", fmt.Errorf("finding key container name failed: %v", errNoToStr(uint32(r1)))
}
r2, _, err := procCertGetCertificateContextProperty.Call(
uintptr(unsafe.Pointer(certContext)),
uintptr(CERT_KEY_PROV_INFO_PROP_ID),
uintptr(0),
uintptr(unsafe.Pointer(provInfo)),
)
if !errors.Is(err, windows.Errno(0)) {
return "", fmt.Errorf("CertGetCertificateContextProperty returned %w", err)
}
if r2 == 0 {
return "", fmt.Errorf("finding key container name failed: %v", errNoToStr(uint32(r2)))
}
return "", nil
}
func certStrToName(x500Str string) ([]byte, error) {
var size uint32
// Get the size of the data to be returned
r, _, err := procCertStrToName.Call(
uintptr(encodingX509ASN),
uintptr(unsafe.Pointer(wide(x500Str))),
uintptr(CERT_X500_NAME_STR|CERT_NAME_STR_COMMA_FLAG),
0, // pvReserved
0, // pbEncoded
uintptr(unsafe.Pointer(&size)),
0,
)
if !errors.Is(err, windows.Errno(0)) {
return nil, fmt.Errorf("CertStrToName returned %w", err)
}
if r != 1 {
return nil, fmt.Errorf("CertStrToName returned %v during size check (%w)", errNoToStr(uint32(r)), err)
}
// Place the data in buf now that we know the size required
buf := make([]byte, size)
r, _, err = procCertStrToName.Call(
uintptr(encodingX509ASN),
uintptr(unsafe.Pointer(wide(x500Str))),
uintptr(CERT_X500_NAME_STR|CERT_NAME_STR_COMMA_FLAG),
0, // pvReserved
uintptr(unsafe.Pointer(&buf[0])),
uintptr(unsafe.Pointer(&size)),
0,
)
if !errors.Is(err, windows.Errno(0)) {
return nil, fmt.Errorf("CertStrToName returned %w", err)
}
if r != 1 {
return nil, fmt.Errorf("CertStrToName returned %v during convert (%w)", errNoToStr(uint32(r)), err)
}
return buf, nil
}
func hashPasswordUTF16(s string) ([]byte, error) {
utf16Str, err := windows.UTF16FromString(s)
if err != nil {
return nil, err
}
bytesStr := make([]byte, len(utf16Str)*2)
for i, utf16 := range utf16Str {
// LPCSTR (Windows' representation of utf16) is always little endian.
binary.LittleEndian.PutUint16(bytesStr[i*2:i*2+2], utf16)
}
digest := sha1.Sum(bytesStr[:len(bytesStr)-2]) // TODO: SHA256 is supported, but if used wont show the UI
return digest[:], nil
}
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