crypto: remove arbitrary UTF16 restriction

doc/api/errors.md

@@ -765,14 +765,6 @@ to enable or disable FIPS mode in the `crypto` module.
 An attempt was made to enable or disable FIPS mode, but FIPS mode was not
 available.
 
-<a id="ERR_CRYPTO_HASH_DIGEST_NO_UTF16"></a>
-### ERR_CRYPTO_HASH_DIGEST_NO_UTF16
-
-The UTF-16 encoding was used with [`hash.digest()`][]. While the
-`hash.digest()` method does allow an `encoding` argument to be passed in,
-causing the method to return a string rather than a `Buffer`, the UTF-16
-encoding (e.g. `ucs` or `utf16le`) is not supported.
-
 <a id="ERR_CRYPTO_HASH_FINALIZED"></a>
 ### ERR_CRYPTO_HASH_FINALIZED
 
@@ -2078,6 +2070,18 @@ removed: v11.12.0
 There was an attempt to use a `MessagePort` instance in a closed
 state, usually after `.close()` has been called.
 
+<a id="ERR_CRYPTO_HASH_DIGEST_NO_UTF16"></a>
+### ERR_CRYPTO_HASH_DIGEST_NO_UTF16
+<!-- YAML
+added: v9.0.0
+removed: REPLACEME
+-->
+
+The UTF-16 encoding was used with [`hash.digest()`][]. While the
+`hash.digest()` method does allow an `encoding` argument to be passed in,
+causing the method to return a string rather than a `Buffer`, the UTF-16
+encoding (e.g. `ucs` or `utf16le`) is not supported.
+
 <a id="ERR_HTTP2_FRAME_ERROR"></a>
 ### ERR_HTTP2_FRAME_ERROR
 <!-- YAML

lib/internal/crypto/hash.js

@@ -20,14 +20,12 @@ const {
 const { Buffer } = require('buffer');
 
 const {
-  ERR_CRYPTO_HASH_DIGEST_NO_UTF16,
   ERR_CRYPTO_HASH_FINALIZED,
   ERR_CRYPTO_HASH_UPDATE_FAILED,
   ERR_INVALID_ARG_TYPE
 } = require('internal/errors').codes;
 const { validateEncoding, validateString, validateUint32 } =
   require('internal/validators');
-const { normalizeEncoding } = require('internal/util');
 const { isArrayBufferView } = require('internal/util/types');
 const LazyTransform = require('internal/streams/lazy_transform');
 const kState = Symbol('kState');
@@ -90,8 +88,6 @@ Hash.prototype.digest = function digest(outputEncoding) {
   if (state[kFinalized])
     throw new ERR_CRYPTO_HASH_FINALIZED();
   outputEncoding = outputEncoding || getDefaultEncoding();
-  if (normalizeEncoding(outputEncoding) === 'utf16le')
-    throw new ERR_CRYPTO_HASH_DIGEST_NO_UTF16();
 
   // Explicit conversion for backward compatibility.
   const ret = this[kHandle].digest(`${outputEncoding}`);
@@ -121,8 +117,6 @@ Hmac.prototype.update = Hash.prototype.update;
 Hmac.prototype.digest = function digest(outputEncoding) {
   const state = this[kState];
   outputEncoding = outputEncoding || getDefaultEncoding();
-  if (normalizeEncoding(outputEncoding) === 'utf16le')
-    throw new ERR_CRYPTO_HASH_DIGEST_NO_UTF16();
 
   if (state[kFinalized]) {
     const buf = Buffer.from('');

lib/internal/errors.js

@@ -739,8 +739,6 @@ E('ERR_CRYPTO_FIPS_FORCED',
   'Cannot set FIPS mode, it was forced with --force-fips at startup.', Error);
 E('ERR_CRYPTO_FIPS_UNAVAILABLE', 'Cannot set FIPS mode in a non-FIPS build.',
   Error);
-E('ERR_CRYPTO_HASH_DIGEST_NO_UTF16', 'hash.digest() does not support UTF-16',
-  Error);
 E('ERR_CRYPTO_HASH_FINALIZED', 'Digest already called', Error);
 E('ERR_CRYPTO_HASH_UPDATE_FAILED', 'Hash update failed', Error);
 E('ERR_CRYPTO_INCOMPATIBLE_KEY_OPTIONS', 'The selected key encoding %s %s.',

src/node_crypto.cc

@@ -4628,7 +4628,6 @@ void Hmac::HmacDigest(const FunctionCallbackInfo<Value>& args) {
   if (args.Length() >= 1) {
     encoding = ParseEncoding(env->isolate(), args[0], BUFFER);
   }
-  CHECK_NE(encoding, UCS2);  // Digest does not support UTF-16
 
   unsigned char md_value[EVP_MAX_MD_SIZE];
   unsigned int md_len = 0;

test/parallel/test-crypto-hash.js

@@ -161,13 +161,9 @@ common.expectsError(
     type: Error
   });
 
-common.expectsError(
-  () => crypto.createHash('sha256').digest('ucs2'),
-  {
-    code: 'ERR_CRYPTO_HASH_DIGEST_NO_UTF16',
-    type: Error
-  }
-);
+assert.strictEqual(
+  crypto.createHash('sha256').update('test').digest('ucs2'),
+  crypto.createHash('sha256').update('test').digest().toString('ucs2'));
 
 common.expectsError(
   () => crypto.createHash(),

test/parallel/test-crypto-hmac.js

@@ -408,12 +408,9 @@ const rfc2202_sha1 = [
 for (const { key, data, hmac } of rfc2202_sha1)
   testHmac('sha1', key, data, hmac);
 
-common.expectsError(
-  () => crypto.createHmac('sha256', 'w00t').digest('ucs2'),
-  {
-    code: 'ERR_CRYPTO_HASH_DIGEST_NO_UTF16',
-    type: Error
-  });
+assert.strictEqual(
+  crypto.createHmac('sha256', 'w00t').digest('ucs2'),
+  crypto.createHmac('sha256', 'w00t').digest().toString('ucs2'));
 
 // Check initialized -> uninitialized state transition after calling digest().
 {