diff --git a/security/nss/cmd/selfserv/selfserv.c b/security/nss/cmd/selfserv/selfserv.c
index 1784c9ee3a..6c00d3a15d 100644
--- a/security/nss/cmd/selfserv/selfserv.c
+++ b/security/nss/cmd/selfserv/selfserv.c
@@ -233,7 +233,9 @@ PrintParameterUsage()
         "     ecdsa_secp521r1_sha512,\n"
         "     rsa_pss_rsae_sha256, rsa_pss_rsae_sha384, rsa_pss_rsae_sha512,\n"
         "     rsa_pss_pss_sha256, rsa_pss_pss_sha384, rsa_pss_pss_sha512,\n"
-        "-Z enable 0-RTT (for TLS 1.3; also use -u)\n",
+        "-Z enable 0-RTT (for TLS 1.3; also use -u)\n"
+        "-E enable post-handshake authentication\n"
+        "   (for TLS 1.3; only has an effect with 3 or more -r options)\n",
         stderr);
 }
 
@@ -804,6 +806,7 @@ PRBool failedToNegotiateName = PR_FALSE;
 PRBool enableExtendedMasterSecret = PR_FALSE;
 PRBool zeroRTT = PR_FALSE;
 PRBool enableALPN = PR_FALSE;
+PRBool enablePostHandshakeAuth = PR_FALSE;
 SSLNamedGroup *enabledGroups = NULL;
 unsigned int enabledGroupsCount = 0;
 const SSLSignatureScheme *enabledSigSchemes = NULL;
@@ -1431,15 +1434,28 @@ handle_connection(PRFileDesc *tcp_sock, PRFileDesc *model_sock)
                         errWarn("second SSL_OptionSet SSL_REQUIRE_CERTIFICATE");
                         break;
                     }
-                    rv = SSL_ReHandshake(ssl_sock, PR_TRUE);
-                    if (rv != 0) {
-                        errWarn("SSL_ReHandshake");
-                        break;
-                    }
-                    rv = SSL_ForceHandshake(ssl_sock);
-                    if (rv < 0) {
-                        errWarn("SSL_ForceHandshake");
-                        break;
+                    if (enablePostHandshakeAuth) {
+                        rv = SSL_SendCertificateRequest(ssl_sock);
+                        if (rv != SECSuccess) {
+                            errWarn("SSL_SendCertificateRequest");
+                            break;
+                        }
+                        rv = SSL_ForceHandshake(ssl_sock);
+                        if (rv != SECSuccess) {
+                            errWarn("SSL_ForceHandshake");
+                            break;
+                        }
+                    } else {
+                        rv = SSL_ReHandshake(ssl_sock, PR_TRUE);
+                        if (rv != 0) {
+                            errWarn("SSL_ReHandshake");
+                            break;
+                        }
+                        rv = SSL_ForceHandshake(ssl_sock);
+                        if (rv < 0) {
+                            errWarn("SSL_ForceHandshake");
+                            break;
+                        }
                     }
                 }
             }
@@ -1948,6 +1964,16 @@ server_main(
         }
     }
 
+    if (enablePostHandshakeAuth) {
+        if (enabledVersions.max < SSL_LIBRARY_VERSION_TLS_1_3) {
+            errExit("You tried enabling post-handshake auth without enabling TLS 1.3!");
+        }
+        rv = SSL_OptionSet(model_sock, SSL_ENABLE_POST_HANDSHAKE_AUTH, PR_TRUE);
+        if (rv != SECSuccess) {
+            errExit("error enabling post-handshake auth");
+        }
+    }
+
     if (enableALPN) {
         PRUint8 alpnVal[] = { 0x08,
                               0x68, 0x74, 0x74, 0x70, 0x2f, 0x31, 0x2e, 0x31 };
@@ -2223,7 +2249,7 @@ main(int argc, char **argv)
     **      in 3.28, please leave some time before resuing those.
     **      'z' was removed in 3.39. */
     optstate = PL_CreateOptState(argc, argv,
-                                 "2:A:C:DGH:I:J:L:M:NP:QRS:T:U:V:W:YZa:bc:d:e:f:g:hi:jk:lmn:op:rst:uvw:y");
+                                 "2:A:C:DEGH:I:J:L:M:NP:QRS:T:U:V:W:YZa:bc:d:e:f:g:hi:jk:lmn:op:rst:uvw:y");
     while ((status = PL_GetNextOpt(optstate)) == PL_OPT_OK) {
         ++optionsFound;
         switch (optstate->option) {
@@ -2243,6 +2269,11 @@ main(int argc, char **argv)
             case 'D':
                 noDelay = PR_TRUE;
                 break;
+
+            case 'E':
+                enablePostHandshakeAuth = PR_TRUE;
+                break;
+
             case 'H':
                 configureDHE = (PORT_Atoi(optstate->value) != 0);
                 break;
diff --git a/security/nss/cmd/tstclnt/tstclnt.c b/security/nss/cmd/tstclnt/tstclnt.c
index 520eeff648..bc0cbfa76e 100644
--- a/security/nss/cmd/tstclnt/tstclnt.c
+++ b/security/nss/cmd/tstclnt/tstclnt.c
@@ -221,7 +221,7 @@ PrintUsageHeader()
     fprintf(stderr,
             "Usage:  %s -h host [-a 1st_hs_name ] [-a 2nd_hs_name ] [-p port]\n"
             "  [-D | -d certdir] [-C] [-b | -R root-module] \n"
-            "  [-n nickname] [-Bafosvx] [-c ciphers] [-Y] [-Z]\n"
+            "  [-n nickname] [-Bafosvx] [-c ciphers] [-Y] [-Z] [-E]\n"
             "  [-V [min-version]:[max-version]] [-K] [-T] [-U]\n"
             "  [-r N] [-w passwd] [-W pwfile] [-q [-t seconds]]\n"
             "  [-I groups] [-J signatureschemes]\n"
@@ -311,6 +311,9 @@ PrintParameterUsage()
     fprintf(stderr, "%-20s Use DTLS\n", "-P {client, server}");
     fprintf(stderr, "%-20s Exit after handshake\n", "-Q");
     fprintf(stderr, "%-20s Encrypted SNI Keys\n", "-N");
+    fprintf(stderr, "%-20s Enable post-handshake authentication\n"
+                    "%-20s for TLS 1.3; need to specify -n\n",
+            "-E", "");
 }
 
 static void
@@ -989,6 +992,7 @@ PRBool requestToExit = PR_FALSE;
 char *versionString = NULL;
 PRBool handshakeComplete = PR_FALSE;
 char *encryptedSNIKeys = NULL;
+PRBool enablePostHandshakeAuth = PR_FALSE;
 
 static int
 writeBytesToServer(PRFileDesc *s, const PRUint8 *buf, int nb)
@@ -1410,6 +1414,15 @@ run()
         goto done;
     }
 
+    if (enablePostHandshakeAuth) {
+        rv = SSL_OptionSet(s, SSL_ENABLE_POST_HANDSHAKE_AUTH, PR_TRUE);
+        if (rv != SECSuccess) {
+            SECU_PrintError(progName, "error enabling post-handshake auth");
+            error = 1;
+            goto done;
+        }
+    }
+
     if (enabledGroups) {
         rv = SSL_NamedGroupConfig(s, enabledGroups, enabledGroupsCount);
         if (rv < 0) {
@@ -1707,7 +1720,7 @@ main(int argc, char **argv)
      * Please leave some time before reusing these.
      */
     optstate = PL_CreateOptState(argc, argv,
-                                 "46A:CDFGHI:J:KL:M:N:OP:QR:STUV:W:X:YZa:bc:d:fgh:m:n:op:qr:st:uvw:");
+                                 "46A:CDEFGHI:J:KL:M:N:OP:QR:STUV:W:X:YZa:bc:d:fgh:m:n:op:qr:st:uvw:");
     while ((optstatus = PL_GetNextOpt(optstate)) == PL_OPT_OK) {
         switch (optstate->option) {
             case '?':
@@ -1738,6 +1751,10 @@ main(int argc, char **argv)
                 openDB = PR_FALSE;
                 break;
 
+            case 'E':
+                enablePostHandshakeAuth = PR_TRUE;
+                break;
+
             case 'F':
                 if (serverCertAuth.testFreshStatusFromSideChannel) {
                     /* parameter given twice or more */
@@ -1988,6 +2005,11 @@ main(int argc, char **argv)
         exit(1);
     }
 
+    if (enablePostHandshakeAuth && !nickname) {
+        fprintf(stderr, "%s: -E requires the use of -n\n", progName);
+        exit(1);
+    }
+
     PR_Init(PR_SYSTEM_THREAD, PR_PRIORITY_NORMAL, 1);
 
     PK11_SetPasswordFunc(SECU_GetModulePassword);
diff --git a/security/nss/cpputil/tls_parser.h b/security/nss/cpputil/tls_parser.h
index 881c5268ec..2aa7a0ecdc 100644
--- a/security/nss/cpputil/tls_parser.h
+++ b/security/nss/cpputil/tls_parser.h
@@ -52,6 +52,7 @@ const uint8_t kTlsAlertInappropriateFallback = 86;
 const uint8_t kTlsAlertMissingExtension = 109;
 const uint8_t kTlsAlertUnsupportedExtension = 110;
 const uint8_t kTlsAlertUnrecognizedName = 112;
+const uint8_t kTlsAlertCertificateRequired = 116;
 const uint8_t kTlsAlertNoApplicationProtocol = 120;
 
 const uint8_t kTlsFakeChangeCipherSpec[] = {
diff --git a/security/nss/gtests/ssl_gtest/ssl_auth_unittest.cc b/security/nss/gtests/ssl_gtest/ssl_auth_unittest.cc
index 8db23e74e1..473932655f 100644
--- a/security/nss/gtests/ssl_gtest/ssl_auth_unittest.cc
+++ b/security/nss/gtests/ssl_gtest/ssl_auth_unittest.cc
@@ -320,6 +320,46 @@ TEST_F(TlsConnectStreamTls13, PostHandshakeAuthConcurrent) {
   EXPECT_EQ(PR_WOULD_BLOCK_ERROR, PORT_GetError());
 }
 
+TEST_F(TlsConnectStreamTls13, PostHandshakeAuthBeforeKeyUpdate) {
+  client_->SetupClientAuth();
+  EXPECT_EQ(SECSuccess, SSL_OptionSet(client_->ssl_fd(),
+                                      SSL_ENABLE_POST_HANDSHAKE_AUTH, PR_TRUE));
+  Connect();
+  // Send CertificateRequest.
+  EXPECT_EQ(SECSuccess, SSL_SendCertificateRequest(server_->ssl_fd()))
+      << "Unexpected error: " << PORT_ErrorToName(PORT_GetError());
+  // Send KeyUpdate.
+  EXPECT_EQ(SECFailure, SSL_KeyUpdate(server_->ssl_fd(), PR_TRUE));
+  EXPECT_EQ(PR_WOULD_BLOCK_ERROR, PORT_GetError());
+}
+
+TEST_F(TlsConnectStreamTls13, PostHandshakeAuthDuringClientKeyUpdate) {
+  client_->SetupClientAuth();
+  EXPECT_EQ(SECSuccess, SSL_OptionSet(client_->ssl_fd(),
+                                      SSL_ENABLE_POST_HANDSHAKE_AUTH, PR_TRUE));
+  Connect();
+  CheckEpochs(3, 3);
+  // Send CertificateRequest from server.
+  EXPECT_EQ(SECSuccess, SSL_SendCertificateRequest(server_->ssl_fd()))
+      << "Unexpected error: " << PORT_ErrorToName(PORT_GetError());
+  // Send KeyUpdate from client.
+  EXPECT_EQ(SECSuccess, SSL_KeyUpdate(client_->ssl_fd(), PR_TRUE));
+  server_->SendData(50);   // server sends CertificateRequest
+  client_->SendData(50);   // client sends KeyUpdate
+  server_->ReadBytes(50);  // server receives KeyUpdate and defers response
+  CheckEpochs(4, 3);
+  client_->ReadBytes(50);  // client receives CertificateRequest
+  client_->SendData(
+      50);  // client sends Certificate, CertificateVerify, Finished
+  server_->ReadBytes(
+      50);  // server receives Certificate, CertificateVerify, Finished
+  client_->CheckEpochs(3, 4);
+  server_->CheckEpochs(4, 4);
+  server_->SendData(50);   // server sends KeyUpdate
+  client_->ReadBytes(50);  // client receives KeyUpdate
+  client_->CheckEpochs(4, 4);
+}
+
 TEST_F(TlsConnectStreamTls13, PostHandshakeAuthMissingExtension) {
   client_->SetupClientAuth();
   Connect();
@@ -454,6 +494,9 @@ TEST_F(TlsConnectStreamTls13, PostHandshakeAuthDecline) {
   client_->SetupClientAuth();
   EXPECT_EQ(SECSuccess, SSL_OptionSet(client_->ssl_fd(),
                                       SSL_ENABLE_POST_HANDSHAKE_AUTH, PR_TRUE));
+  EXPECT_EQ(SECSuccess,
+            SSL_OptionSet(server_->ssl_fd(), SSL_REQUIRE_CERTIFICATE,
+                          SSL_REQUIRE_ALWAYS));
   // Client to decline the certificate request.
   EXPECT_EQ(SECSuccess,
             SSL_GetClientAuthDataHook(
@@ -472,10 +515,13 @@ TEST_F(TlsConnectStreamTls13, PostHandshakeAuthDecline) {
   // Send CertificateRequest.
   EXPECT_EQ(SECSuccess, SSL_SendCertificateRequest(server_->ssl_fd()))
       << "Unexpected error: " << PORT_ErrorToName(PORT_GetError());
-  server_->SendData(50);
-  client_->ReadBytes(50);
-  client_->SendData(50);
-  server_->ReadBytes(50);
+  server_->SendData(50);   // send Certificate Request
+  client_->ReadBytes(50);  // read Certificate Request
+  client_->SendData(50);   // send empty Certificate+Finished
+  server_->ExpectSendAlert(kTlsAlertCertificateRequired);
+  server_->ReadBytes(50);  // read empty Certificate+Finished
+  server_->ExpectReadWriteError();
+  server_->SendData(50);  // send alert
   // AuthCertificateCallback is not called, because the client sends
   // an empty certificate_list.
   EXPECT_EQ(0U, called);
diff --git a/security/nss/lib/softoken/sdb.c b/security/nss/lib/softoken/sdb.c
index 4830bc111f..142cb5ddaa 100644
--- a/security/nss/lib/softoken/sdb.c
+++ b/security/nss/lib/softoken/sdb.c
@@ -941,9 +941,12 @@ sdb_GetAttributeValueNoLock(SDB *sdb, CK_OBJECT_HANDLE object_id,
                 blobSize = sqlite3_column_bytes(stmt, i);
                 blobData = sqlite3_column_blob(stmt, i);
                 if (blobData == NULL) {
+                    /* PKCS 11 requires that get attributes process all the
+                     * attributes in the template, marking the attributes with
+                     * issues with -1. Mark the error but continue */
                     template[i].ulValueLen = -1;
                     error = CKR_ATTRIBUTE_TYPE_INVALID;
-                    break;
+                    continue;
                 }
                 /* If the blob equals our explicit NULL value, then the
                  * attribute is a NULL. */
@@ -954,9 +957,10 @@ sdb_GetAttributeValueNoLock(SDB *sdb, CK_OBJECT_HANDLE object_id,
                 }
                 if (template[i].pValue) {
                     if (template[i].ulValueLen < blobSize) {
+                        /* like CKR_ATTRIBUTE_TYPE_INVALID, continue processing */
                         template[i].ulValueLen = -1;
                         error = CKR_BUFFER_TOO_SMALL;
-                        break;
+                        continue;
                     }
                     PORT_Memcpy(template[i].pValue, blobData, blobSize);
                 }
diff --git a/security/nss/lib/ssl/SSLerrs.h b/security/nss/lib/ssl/SSLerrs.h
index 5e428406a2..a6047e6dbb 100644
--- a/security/nss/lib/ssl/SSLerrs.h
+++ b/security/nss/lib/ssl/SSLerrs.h
@@ -564,3 +564,6 @@ ER3(SSL_ERROR_MISSING_ESNI_EXTENSION, (SSL_ERROR_BASE + 178),
 
 ER3(SSL_ERROR_RX_UNEXPECTED_RECORD_TYPE, (SSL_ERROR_BASE + 179),
     "SSL received an unexpected record type.")
+
+ER3(SSL_ERROR_RX_CERTIFICATE_REQUIRED_ALERT, (SSL_ERROR_BASE + 181),
+    "SSL received a certificate_required alert.")
diff --git a/security/nss/lib/ssl/ssl3con.c b/security/nss/lib/ssl/ssl3con.c
index 9385e52638..142c8bccf1 100644
--- a/security/nss/lib/ssl/ssl3con.c
+++ b/security/nss/lib/ssl/ssl3con.c
@@ -2683,7 +2683,12 @@ ssl3_HandleNoCertificate(sslSocket *ss)
         PRFileDesc *lower;
 
         ssl_UncacheSessionID(ss);
-        SSL3_SendAlert(ss, alert_fatal, bad_certificate);
+
+        if (ss->version >= SSL_LIBRARY_VERSION_TLS_1_3) {
+            SSL3_SendAlert(ss, alert_fatal, certificate_required);
+        } else {
+            SSL3_SendAlert(ss, alert_fatal, bad_certificate);
+        }
 
         lower = ss->fd->lower;
 #ifdef _WIN32
@@ -2919,6 +2924,9 @@ ssl3_HandleAlert(sslSocket *ss, sslBuffer *buf)
         case no_certificate:
             error = SSL_ERROR_NO_CERTIFICATE;
             break;
+        case certificate_required:
+            error = SSL_ERROR_RX_CERTIFICATE_REQUIRED_ALERT;
+            break;
         case bad_certificate:
             error = SSL_ERROR_BAD_CERT_ALERT;
             break;
@@ -3719,6 +3727,10 @@ ssl3_RestartHandshakeHashes(sslSocket *ss)
         PK11_DestroyContext(ss->ssl3.hs.sha, PR_TRUE);
         ss->ssl3.hs.sha = NULL;
     }
+    if (ss->ssl3.hs.shaPostHandshake) {
+        PK11_DestroyContext(ss->ssl3.hs.shaPostHandshake, PR_TRUE);
+        ss->ssl3.hs.shaPostHandshake = NULL;
+    }
 }
 
 /*
@@ -3778,6 +3790,24 @@ ssl3_UpdateHandshakeHashes(sslSocket *ss, const unsigned char *b, unsigned int l
     return rv;
 }
 
+SECStatus
+ssl3_UpdatePostHandshakeHashes(sslSocket *ss, const unsigned char *b, unsigned int l)
+{
+    SECStatus rv = SECSuccess;
+
+    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));
+
+    PRINT_BUF(90, (ss, "post handshake hash input:", b, l));
+
+    PORT_Assert(ss->ssl3.hs.hashType == handshake_hash_single);
+    PORT_Assert(ss->version >= SSL_LIBRARY_VERSION_TLS_1_3);
+    rv = PK11_DigestOp(ss->ssl3.hs.shaPostHandshake, b, l);
+    if (rv != SECSuccess) {
+        PORT_SetError(SSL_ERROR_DIGEST_FAILURE);
+    }
+    return rv;
+}
+
 SECStatus
 ssl3_AppendHandshakeHeader(sslSocket *ss, SSLHandshakeType t, PRUint32 length)
 {
@@ -11623,7 +11653,8 @@ ssl3_FinishHandshake(sslSocket *ss)
 SECStatus
 ssl_HashHandshakeMessageInt(sslSocket *ss, SSLHandshakeType ct,
                             PRUint32 dtlsSeq,
-                            const PRUint8 *b, PRUint32 length)
+                            const PRUint8 *b, PRUint32 length,
+                            sslUpdateHandshakeHashes updateHashes)
 {
     PRUint8 hdr[4];
     PRUint8 dtlsData[8];
@@ -11636,7 +11667,7 @@ ssl_HashHandshakeMessageInt(sslSocket *ss, SSLHandshakeType ct,
     hdr[2] = (PRUint8)(length >> 8);
     hdr[3] = (PRUint8)(length);
 
-    rv = ssl3_UpdateHandshakeHashes(ss, (unsigned char *)hdr, 4);
+    rv = updateHashes(ss, (unsigned char *)hdr, 4);
     if (rv != SECSuccess)
         return rv; /* err code already set. */
 
@@ -11656,14 +11687,13 @@ ssl_HashHandshakeMessageInt(sslSocket *ss, SSLHandshakeType ct,
         dtlsData[6] = (PRUint8)(length >> 8);
         dtlsData[7] = (PRUint8)(length);
 
-        rv = ssl3_UpdateHandshakeHashes(ss, (unsigned char *)dtlsData,
-                                        sizeof(dtlsData));
+        rv = updateHashes(ss, (unsigned char *)dtlsData, sizeof(dtlsData));
         if (rv != SECSuccess)
             return rv; /* err code already set. */
     }
 
     /* The message body */
-    rv = ssl3_UpdateHandshakeHashes(ss, b, length);
+    rv = updateHashes(ss, b, length);
     if (rv != SECSuccess)
         return rv; /* err code already set. */
 
@@ -11675,7 +11705,15 @@ ssl_HashHandshakeMessage(sslSocket *ss, SSLHandshakeType ct,
                          const PRUint8 *b, PRUint32 length)
 {
     return ssl_HashHandshakeMessageInt(ss, ct, ss->ssl3.hs.recvMessageSeq,
-                                       b, length);
+                                       b, length, ssl3_UpdateHandshakeHashes);
+}
+
+SECStatus
+ssl_HashPostHandshakeMessage(sslSocket *ss, SSLHandshakeType ct,
+                             const PRUint8 *b, PRUint32 length)
+{
+    return ssl_HashHandshakeMessageInt(ss, ct, ss->ssl3.hs.recvMessageSeq,
+                                       b, length, ssl3_UpdatePostHandshakeHashes);
 }
 
 /* Called from ssl3_HandleHandshake() when it has gathered a complete ssl3
@@ -11714,9 +11752,11 @@ ssl3_HandleHandshakeMessage(sslSocket *ss, PRUint8 *b, PRUint32 length,
             break;
 
         default:
-            rv = ssl_HashHandshakeMessage(ss, ss->ssl3.hs.msg_type, b, length);
-            if (rv != SECSuccess) {
-                return SECFailure;
+            if (!tls13_IsPostHandshake(ss)) {
+                rv = ssl_HashHandshakeMessage(ss, ss->ssl3.hs.msg_type, b, length);
+                if (rv != SECSuccess) {
+                    return SECFailure;
+                }
             }
     }
 
@@ -13129,6 +13169,9 @@ ssl3_DestroySSL3Info(sslSocket *ss)
     if (ss->ssl3.hs.sha) {
         PK11_DestroyContext(ss->ssl3.hs.sha, PR_TRUE);
     }
+    if (ss->ssl3.hs.shaPostHandshake) {
+        PK11_DestroyContext(ss->ssl3.hs.shaPostHandshake, PR_TRUE);
+    }
     if (ss->ssl3.hs.messages.buf) {
         sslBuffer_Clear(&ss->ssl3.hs.messages);
     }
diff --git a/security/nss/lib/ssl/ssl3prot.h b/security/nss/lib/ssl/ssl3prot.h
index bfaa10d3fb..ffe8373011 100644
--- a/security/nss/lib/ssl/ssl3prot.h
+++ b/security/nss/lib/ssl/ssl3prot.h
@@ -74,6 +74,7 @@ typedef enum {
     unrecognized_name = 112,
     bad_certificate_status_response = 113,
     bad_certificate_hash_value = 114,
+    certificate_required = 116,
     no_application_protocol = 120,
 
     /* invalid alert */
diff --git a/security/nss/lib/ssl/sslencode.c b/security/nss/lib/ssl/sslencode.c
index e508804515..e59e758ff9 100644
--- a/security/nss/lib/ssl/sslencode.c
+++ b/security/nss/lib/ssl/sslencode.c
@@ -10,6 +10,7 @@
 #include "prnetdb.h"
 #include "ssl.h"
 #include "sslimpl.h"
+#include "sslproto.h"
 
 /* Helper function to encode an unsigned integer into a buffer. */
 static void
@@ -263,9 +264,11 @@ ssl3_AppendHandshake(sslSocket *ss, const void *void_src, unsigned int bytes)
     }
 
     PRINT_BUF(60, (ss, "Append to Handshake", (unsigned char *)void_src, bytes));
-    rv = ssl3_UpdateHandshakeHashes(ss, src, bytes);
-    if (rv != SECSuccess)
-        return SECFailure; /* error code set by ssl3_UpdateHandshakeHashes */
+    if (!ss->firstHsDone || ss->version < SSL_LIBRARY_VERSION_TLS_1_3) {
+        rv = ssl3_UpdateHandshakeHashes(ss, src, bytes);
+        if (rv != SECSuccess)
+            return SECFailure; /* error code set by ssl3_UpdateHandshakeHashes */
+    }
 
     while (bytes > room) {
         if (room > 0)
diff --git a/security/nss/lib/ssl/sslerr.h b/security/nss/lib/ssl/sslerr.h
index b8f4e30eaf..9e72da28fe 100644
--- a/security/nss/lib/ssl/sslerr.h
+++ b/security/nss/lib/ssl/sslerr.h
@@ -269,6 +269,7 @@ typedef enum {
     SSL_ERROR_MISSING_ESNI_EXTENSION = (SSL_ERROR_BASE + 178),
     SSL_ERROR_RX_UNEXPECTED_RECORD_TYPE = (SSL_ERROR_BASE + 179),
     SSL_ERROR_MISSING_POST_HANDSHAKE_AUTH_EXTENSION = (SSL_ERROR_BASE + 180),
+    SSL_ERROR_RX_CERTIFICATE_REQUIRED_ALERT = (SSL_ERROR_BASE + 181),
     SSL_ERROR_END_OF_LIST   /* let the c compiler determine the value of this. */
 } SSLErrorCodes;
 #endif /* NO_SECURITY_ERROR_ENUM */
diff --git a/security/nss/lib/ssl/sslimpl.h b/security/nss/lib/ssl/sslimpl.h
index 575f4964a4..b70ddc9558 100644
--- a/security/nss/lib/ssl/sslimpl.h
+++ b/security/nss/lib/ssl/sslimpl.h
@@ -144,6 +144,11 @@ typedef enum {
     ticket_allow_psk_sign_auth = 16
 } TLS13SessionTicketFlags;
 
+typedef enum {
+    update_not_requested = 0,
+    update_requested = 1
+} tls13KeyUpdateRequest;
+
 struct sslNamedGroupDefStr {
     /* The name is the value that is encoded on the wire in TLS. */
     SSLNamedGroup name;
@@ -610,6 +615,7 @@ typedef struct SSL3HandshakeStateStr {
      * TLS 1.2 and later use only |sha|, for SHA-256. */
     PK11Context *md5;
     PK11Context *sha;
+    PK11Context *shaPostHandshake;
     SSLSignatureScheme signatureScheme;
     const ssl3KEADef *kea_def;
     ssl3CipherSuite cipher_suite;
@@ -743,6 +749,11 @@ struct ssl3StateStr {
      * update is initiated locally. */
     PRBool peerRequestedKeyUpdate;
 
+    /* This is true if we deferred sending a key update as
+     * post-handshake auth is in progress. */
+    PRBool keyUpdateDeferred;
+    tls13KeyUpdateRequest deferredKeyUpdateRequest;
+
     /* This is true after the server requests client certificate;
      * false after the client certificate is received.  Used by the
      * server. */
@@ -1213,15 +1224,24 @@ extern SECStatus Null_Cipher(void *ctx, unsigned char *output, unsigned int *out
                              unsigned int maxOutputLen, const unsigned char *input,
                              unsigned int inputLen);
 extern void ssl3_RestartHandshakeHashes(sslSocket *ss);
+typedef SECStatus (*sslUpdateHandshakeHashes)(sslSocket *ss,
+                                              const unsigned char *b,
+                                              unsigned int l);
 extern SECStatus ssl3_UpdateHandshakeHashes(sslSocket *ss,
                                             const unsigned char *b,
                                             unsigned int l);
+extern SECStatus ssl3_UpdatePostHandshakeHashes(sslSocket *ss,
+                                                const unsigned char *b,
+                                                unsigned int l);
 SECStatus
 ssl_HashHandshakeMessageInt(sslSocket *ss, SSLHandshakeType type,
                             PRUint32 dtlsSeq,
-                            const PRUint8 *b, PRUint32 length);
+                            const PRUint8 *b, PRUint32 length,
+                            sslUpdateHandshakeHashes cb);
 SECStatus ssl_HashHandshakeMessage(sslSocket *ss, SSLHandshakeType type,
                                    const PRUint8 *b, PRUint32 length);
+SECStatus ssl_HashPostHandshakeMessage(sslSocket *ss, SSLHandshakeType type,
+                                       const PRUint8 *b, PRUint32 length);
 
 /* Returns PR_TRUE if we are still waiting for the server to complete its
  * response to our client second round. Once we've received the Finished from
diff --git a/security/nss/lib/ssl/sslsecur.c b/security/nss/lib/ssl/sslsecur.c
index 79634e4039..14320fa190 100644
--- a/security/nss/lib/ssl/sslsecur.c
+++ b/security/nss/lib/ssl/sslsecur.c
@@ -720,7 +720,8 @@ tls13_CheckKeyUpdate(sslSocket *ss, SSLSecretDirection dir)
     ssl3CipherSpec *spec;
     sslSequenceNumber seqNum;
     sslSequenceNumber margin;
-    SECStatus rv;
+    tls13KeyUpdateRequest keyUpdateRequest;
+    SECStatus rv = SECSuccess;
 
     /* Bug 1413368: enable for DTLS */
     if (ss->version < SSL_LIBRARY_VERSION_TLS_1_3 || IS_DTLS(ss)) {
@@ -755,9 +756,15 @@ tls13_CheckKeyUpdate(sslSocket *ss, SSLSecretDirection dir)
     SSL_TRC(5, ("%d: SSL[%d]: automatic key update at %llx for %s cipher spec",
                 SSL_GETPID(), ss->fd, seqNum,
                 (dir == ssl_secret_read) ? "read" : "write"));
+    keyUpdateRequest = (dir == ssl_secret_read) ? update_requested : update_not_requested;
     ssl_GetSSL3HandshakeLock(ss);
-    rv = tls13_SendKeyUpdate(ss, (dir == ssl_secret_read) ? update_requested : update_not_requested,
-                             dir == ssl_secret_write /* buffer */);
+    if (ss->ssl3.clientCertRequested) {
+        ss->ssl3.keyUpdateDeferred = PR_TRUE;
+        ss->ssl3.deferredKeyUpdateRequest = keyUpdateRequest;
+    } else {
+        rv = tls13_SendKeyUpdate(ss, keyUpdateRequest,
+                                 dir == ssl_secret_write /* buffer */);
+    }
     ssl_ReleaseSSL3HandshakeLock(ss);
     return rv;
 }
diff --git a/security/nss/lib/ssl/tls13con.c b/security/nss/lib/ssl/tls13con.c
index 7046180700..88bc618b34 100644
--- a/security/nss/lib/ssl/tls13con.c
+++ b/security/nss/lib/ssl/tls13con.c
@@ -259,6 +259,12 @@ tls13_CheckHsState(sslSocket *ss, int err, const char *error_name,
     return SECFailure;
 }
 
+PRBool
+tls13_IsPostHandshake(const sslSocket *ss)
+{
+    return ss->version >= SSL_LIBRARY_VERSION_TLS_1_3 && ss->firstHsDone;
+}
+
 SSLHashType
 tls13_GetHashForCipherSuite(ssl3CipherSuite suite)
 {
@@ -682,8 +688,9 @@ tls13_SendKeyUpdate(sslSocket *ss, tls13KeyUpdateRequest request, PRBool buffer)
                                               : "not requested"));
 
     PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));
+    PORT_Assert(!ss->sec.isServer || !ss->ssl3.clientCertRequested);
 
-    if (!ss->firstHsDone) {
+    if (!tls13_IsPostHandshake(ss)) {
         PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
         return SECFailure;
     }
@@ -741,11 +748,16 @@ SSLExp_KeyUpdate(PRFileDesc *fd, PRBool requestUpdate)
         return SECFailure;
     }
 
-    if (!ss->firstHsDone) {
+    if (!tls13_IsPostHandshake(ss)) {
         PORT_SetError(SEC_ERROR_INVALID_ARGS);
         return SECFailure;
     }
 
+    if (ss->ssl3.clientCertRequested) {
+        PORT_SetError(PR_WOULD_BLOCK_ERROR);
+        return SECFailure;
+    }
+
     rv = TLS13_CHECK_HS_STATE(ss, SEC_ERROR_INVALID_ARGS,
                               idle_handshake);
     if (rv != SECSuccess) {
@@ -786,7 +798,7 @@ tls13_HandleKeyUpdate(sslSocket *ss, PRUint8 *b, unsigned int length)
     PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));
 
     PORT_Assert(ss->firstHsDone);
-    if (!ss->firstHsDone) {
+    if (!tls13_IsPostHandshake(ss)) {
         FATAL_ERROR(ss, SSL_ERROR_RX_UNEXPECTED_KEY_UPDATE, unexpected_message);
         return SECFailure;
     }
@@ -820,7 +832,12 @@ tls13_HandleKeyUpdate(sslSocket *ss, PRUint8 *b, unsigned int length)
 
     if (update == update_requested) {
         PRBool sendUpdate;
-        if (ss->ssl3.peerRequestedKeyUpdate) {
+        if (ss->ssl3.clientCertRequested) {
+            /* Post-handshake auth is in progress; defer sending a key update. */
+            ss->ssl3.keyUpdateDeferred = PR_TRUE;
+            ss->ssl3.deferredKeyUpdateRequest = update_not_requested;
+            sendUpdate = PR_FALSE;
+        } else if (ss->ssl3.peerRequestedKeyUpdate) {
             /* Only send an update if we have sent with the current spec.  This
              * prevents us from being forced to crank forward pointlessly. */
             ssl_GetSpecReadLock(ss);
@@ -857,7 +874,7 @@ SSLExp_SendCertificateRequest(PRFileDesc *fd)
         return SECFailure;
     }
 
-    if (!ss->firstHsDone || ss->version < SSL_LIBRARY_VERSION_TLS_1_3) {
+    if (!tls13_IsPostHandshake(ss)) {
         PORT_SetError(SEC_ERROR_INVALID_ARGS);
         return SECFailure;
     }
@@ -2195,10 +2212,20 @@ tls13_SendCertificateRequest(sslSocket *ss)
 {
     SECStatus rv;
     sslBuffer extensionBuf = SSL_BUFFER_EMPTY;
+    unsigned int offset = 0;
 
     SSL_TRC(3, ("%d: TLS13[%d]: begin send certificate_request",
                 SSL_GETPID(), ss->fd));
 
+    if (ss->firstHsDone) {
+        PORT_Assert(ss->ssl3.hs.shaPostHandshake == NULL);
+        ss->ssl3.hs.shaPostHandshake = PK11_CloneContext(ss->ssl3.hs.sha);
+        if (ss->ssl3.hs.shaPostHandshake == NULL) {
+            ssl_MapLowLevelError(SSL_ERROR_SHA_DIGEST_FAILURE);
+            return SECFailure;
+        }
+    }
+
     rv = ssl_ConstructExtensions(ss, &extensionBuf, ssl_hs_certificate_request);
     if (rv != SECSuccess) {
         return SECFailure; /* Code already set. */
@@ -2222,6 +2249,8 @@ tls13_SendCertificateRequest(sslSocket *ss)
             FATAL_ERROR(ss, SEC_ERROR_NO_MEMORY, internal_error);
             goto loser;
         }
+
+        offset = SSL_BUFFER_LEN(&ss->sec.ci.sendBuf);
     }
 
     rv = ssl3_AppendHandshakeHeader(ss, ssl_hs_certificate_request,
@@ -2245,6 +2274,15 @@ tls13_SendCertificateRequest(sslSocket *ss)
         goto loser; /* err set by AppendHandshake. */
     }
 
+    if (ss->firstHsDone) {
+        rv = ssl3_UpdatePostHandshakeHashes(ss,
+                                            SSL_BUFFER_BASE(&ss->sec.ci.sendBuf) + offset,
+                                            SSL_BUFFER_LEN(&ss->sec.ci.sendBuf) - offset);
+        if (rv != SECSuccess) {
+            goto loser;
+        }
+    }
+
     sslBuffer_Clear(&extensionBuf);
     return SECSuccess;
 
@@ -2410,7 +2448,19 @@ tls13_HandleCertificateRequest(sslSocket *ss, PRUint8 *b, PRUint32 length)
         return SECFailure;
     }
 
-    if (ss->firstHsDone) {
+    if (tls13_IsPostHandshake(ss)) {
+        PORT_Assert(ss->ssl3.hs.shaPostHandshake == NULL);
+        ss->ssl3.hs.shaPostHandshake = PK11_CloneContext(ss->ssl3.hs.sha);
+        if (ss->ssl3.hs.shaPostHandshake == NULL) {
+            ssl_MapLowLevelError(SSL_ERROR_SHA_DIGEST_FAILURE);
+            return SECFailure;
+        }
+        rv = ssl_HashPostHandshakeMessage(ss, ssl_hs_certificate_request, b, length);
+        if (rv != SECSuccess) {
+            FATAL_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE, internal_error);
+            return SECFailure;
+        }
+
         /* clean up anything left from previous handshake. */
         if (ss->ssl3.clientCertChain != NULL) {
             CERT_DestroyCertificateList(ss->ssl3.clientCertChain);
@@ -2441,7 +2491,7 @@ tls13_HandleCertificateRequest(sslSocket *ss, PRUint8 *b, PRUint32 length)
 
     /* Unless it is a post-handshake client auth, the certificate
      * request context must be empty. */
-    if (!ss->firstHsDone && context.len > 0) {
+    if (!tls13_IsPostHandshake(ss) && context.len > 0) {
         FATAL_ERROR(ss, SSL_ERROR_RX_MALFORMED_CERT_REQUEST, illegal_parameter);
         return SECFailure;
     }
@@ -2501,6 +2551,9 @@ tls13_HandleCertificateRequest(sslSocket *ss, PRUint8 *b, PRUint32 length)
             return SECFailure;
         }
         PORT_Assert(ss->ssl3.hs.ws == idle_handshake);
+        PORT_Assert(ss->ssl3.hs.shaPostHandshake != NULL);
+        PK11_DestroyContext(ss->ssl3.hs.shaPostHandshake, PR_TRUE);
+        ss->ssl3.hs.shaPostHandshake = NULL;
     } else {
         TLS13_SET_HS_STATE(ss, wait_server_cert);
     }
@@ -3058,6 +3111,15 @@ tls13_HandleCertificate(sslSocket *ss, PRUint8 *b, PRUint32 length)
         ssl_CipherSpecReleaseByEpoch(ss, ssl_secret_read, TrafficKeyClearText);
         dtls_ReceivedFirstMessageInFlight(ss);
     }
+
+    if (ss->firstHsDone) {
+        rv = ssl_HashPostHandshakeMessage(ss, ssl_hs_certificate, b, length);
+        if (rv != SECSuccess) {
+            PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
+            return SECFailure;
+        }
+    }
+
     /* Process the context string */
     rv = ssl3_ConsumeHandshakeVariable(ss, &context, 1, &b, &length);
     if (rv != SECSuccess)
@@ -3615,7 +3677,11 @@ tls13_ComputeHandshakeHashes(sslSocket *ss, SSL3Hashes *hashes)
             goto loser;
         }
     } else {
-        ctx = PK11_CloneContext(ss->ssl3.hs.sha);
+        if (ss->firstHsDone) {
+            ctx = PK11_CloneContext(ss->ssl3.hs.shaPostHandshake);
+        } else {
+            ctx = PK11_CloneContext(ss->ssl3.hs.sha);
+        }
         if (!ctx) {
             ssl_MapLowLevelError(SSL_ERROR_SHA_DIGEST_FAILURE);
             return SECFailure;
@@ -4069,7 +4135,11 @@ tls13_HandleCertificateVerify(sslSocket *ss, PRUint8 *b, PRUint32 length)
         return SECFailure;
     }
 
-    rv = ssl_HashHandshakeMessage(ss, ssl_hs_certificate_verify, b, length);
+    if (ss->firstHsDone) {
+        rv = ssl_HashPostHandshakeMessage(ss, ssl_hs_certificate_verify, b, length);
+    } else {
+        rv = ssl_HashHandshakeMessage(ss, ssl_hs_certificate_verify, b, length);
+    }
     if (rv != SECSuccess) {
         PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
         return SECFailure;
@@ -4129,10 +4199,6 @@ tls13_HandleCertificateVerify(sslSocket *ss, PRUint8 *b, PRUint32 length)
         }
     }
 
-    if (ss->ssl3.clientCertRequested) {
-        PORT_Assert(ss->sec.isServer);
-        ss->ssl3.clientCertRequested = PR_FALSE;
-    }
     TLS13_SET_HS_STATE(ss, wait_finished);
 
     return SECSuccess;
@@ -4393,7 +4459,11 @@ tls13_CommonHandleFinished(sslSocket *ss, PK11SymKey *key,
         return SECFailure;
     }
 
-    rv = ssl_HashHandshakeMessage(ss, ssl_hs_finished, b, length);
+    if (ss->firstHsDone) {
+        rv = ssl_HashPostHandshakeMessage(ss, ssl_hs_finished, b, length);
+    } else {
+        rv = ssl_HashHandshakeMessage(ss, ssl_hs_finished, b, length);
+    }
     if (rv != SECSuccess) {
         PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
         return SECFailure;
@@ -4443,6 +4513,22 @@ tls13_ServerHandleFinished(sslSocket *ss, PRUint8 *b, PRUint32 length)
 
     if (ss->firstHsDone) {
         TLS13_SET_HS_STATE(ss, idle_handshake);
+
+        PORT_Assert(ss->ssl3.hs.shaPostHandshake != NULL);
+        PK11_DestroyContext(ss->ssl3.hs.shaPostHandshake, PR_TRUE);
+        ss->ssl3.hs.shaPostHandshake = NULL;
+
+        ss->ssl3.clientCertRequested = PR_FALSE;
+
+        if (ss->ssl3.keyUpdateDeferred) {
+            rv = tls13_SendKeyUpdate(ss, ss->ssl3.deferredKeyUpdateRequest,
+                                     PR_FALSE);
+            if (rv != SECSuccess) {
+                return SECFailure; /* error is set. */
+            }
+            ss->ssl3.keyUpdateDeferred = PR_FALSE;
+        }
+
         return SECSuccess;
     }
 
@@ -4525,11 +4611,16 @@ tls13_SendClientSecondFlight(sslSocket *ss, PRBool sendClientCert,
                              SSL3AlertDescription *sendAlert)
 {
     SECStatus rv;
+    unsigned int offset = 0;
 
     PORT_Assert(ss->opt.noLocks || ssl_HaveXmitBufLock(ss));
 
     *sendAlert = internal_error;
 
+    if (ss->firstHsDone) {
+        offset = SSL_BUFFER_LEN(&ss->sec.ci.sendBuf);
+    }
+
     if (ss->ssl3.sendEmptyCert) {
         ss->ssl3.sendEmptyCert = PR_FALSE;
         rv = ssl3_SendEmptyCertificate(ss);
@@ -4543,6 +4634,16 @@ tls13_SendClientSecondFlight(sslSocket *ss, PRBool sendClientCert,
             return SECFailure; /* error code is set. */
         }
     }
+
+    if (ss->firstHsDone) {
+        rv = ssl3_UpdatePostHandshakeHashes(ss,
+                                            SSL_BUFFER_BASE(&ss->sec.ci.sendBuf) + offset,
+                                            SSL_BUFFER_LEN(&ss->sec.ci.sendBuf) - offset);
+        if (rv != SECSuccess) {
+            return SECFailure; /* error code is set. */
+        }
+    }
+
     if (ss->ssl3.hs.clientCertRequested) {
         SECITEM_FreeItem(&ss->xtnData.certReqContext, PR_FALSE);
         if (ss->xtnData.certReqAuthorities.arena) {
@@ -4555,12 +4656,25 @@ tls13_SendClientSecondFlight(sslSocket *ss, PRBool sendClientCert,
     }
 
     if (sendClientCert) {
+        if (ss->firstHsDone) {
+            offset = SSL_BUFFER_LEN(&ss->sec.ci.sendBuf);
+        }
+
         rv = tls13_SendCertificateVerify(ss, ss->ssl3.clientPrivateKey);
         SECKEY_DestroyPrivateKey(ss->ssl3.clientPrivateKey);
         ss->ssl3.clientPrivateKey = NULL;
         if (rv != SECSuccess) {
             return SECFailure; /* err is set. */
         }
+
+        if (ss->firstHsDone) {
+            rv = ssl3_UpdatePostHandshakeHashes(ss,
+                                                SSL_BUFFER_BASE(&ss->sec.ci.sendBuf) + offset,
+                                                SSL_BUFFER_LEN(&ss->sec.ci.sendBuf) - offset);
+            if (rv != SECSuccess) {
+                return SECFailure; /* error is set. */
+            }
+        }
     }
 
     rv = tls13_SendFinished(ss, ss->firstHsDone ? ss->ssl3.hs.clientTrafficSecret : ss->ssl3.hs.clientHsTrafficSecret);
@@ -4825,8 +4939,7 @@ SSLExp_SendSessionTicket(PRFileDesc *fd, const PRUint8 *token,
         return SECFailure;
     }
 
-    if (!ss->sec.isServer || !ss->firstHsDone ||
-        ss->version < SSL_LIBRARY_VERSION_TLS_1_3 ||
+    if (!ss->sec.isServer || !tls13_IsPostHandshake(ss) ||
         tokenLen > 0xffff) {
         PORT_SetError(SEC_ERROR_INVALID_ARGS);
         return SECFailure;
@@ -4862,7 +4975,7 @@ tls13_HandleNewSessionTicket(sslSocket *ss, PRUint8 *b, PRUint32 length)
     if (rv != SECSuccess) {
         return SECFailure;
     }
-    if (!ss->firstHsDone || ss->sec.isServer) {
+    if (!tls13_IsPostHandshake(ss) || ss->sec.isServer) {
         FATAL_ERROR(ss, SSL_ERROR_RX_UNEXPECTED_NEW_SESSION_TICKET,
                     unexpected_message);
         return SECFailure;
diff --git a/security/nss/lib/ssl/tls13con.h b/security/nss/lib/ssl/tls13con.h
index ed4c4ec787..4968ac3619 100644
--- a/security/nss/lib/ssl/tls13con.h
+++ b/security/nss/lib/ssl/tls13con.h
@@ -18,11 +18,6 @@ typedef enum {
     tls13_extension_unknown
 } tls13ExtensionStatus;
 
-typedef enum {
-    update_not_requested = 0,
-    update_requested = 1
-} tls13KeyUpdateRequest;
-
 #define TLS13_MAX_FINISHED_SIZE 64
 
 SECStatus tls13_UnprotectRecord(
@@ -47,6 +42,8 @@ PRBool tls13_InHsState(sslSocket *ss, ...);
 #define TLS13_IN_HS_STATE(ss, ...) \
     tls13_InHsState(ss, __VA_ARGS__, wait_invalid)
 
+PRBool tls13_IsPostHandshake(const sslSocket *ss);
+
 SSLHashType tls13_GetHashForCipherSuite(ssl3CipherSuite suite);
 SSLHashType tls13_GetHash(const sslSocket *ss);
 unsigned int tls13_GetHashSizeForHash(SSLHashType hash);
diff --git a/security/nss/lib/ssl/tls13hashstate.c b/security/nss/lib/ssl/tls13hashstate.c
index cc0ed286b0..53d3738f0c 100644
--- a/security/nss/lib/ssl/tls13hashstate.c
+++ b/security/nss/lib/ssl/tls13hashstate.c
@@ -157,7 +157,8 @@ tls13_RecoverHashState(sslSocket *ss,
     /* Now reinject the message. */
     SSL_ASSERT_HASHES_EMPTY(ss);
     rv = ssl_HashHandshakeMessageInt(ss, ssl_hs_message_hash, 0,
-                                     SSL_READER_CURRENT(&reader), hashLen);
+                                     SSL_READER_CURRENT(&reader), hashLen,
+                                     ssl3_UpdateHandshakeHashes);
     if (rv != SECSuccess) {
         return SECFailure;
     }
@@ -173,7 +174,8 @@ tls13_RecoverHashState(sslSocket *ss,
 
     rv = ssl_HashHandshakeMessageInt(ss, ssl_hs_server_hello, 0,
                                      SSL_BUFFER_BASE(&messageBuf),
-                                     SSL_BUFFER_LEN(&messageBuf));
+                                     SSL_BUFFER_LEN(&messageBuf),
+                                     ssl3_UpdateHandshakeHashes);
     sslBuffer_Clear(&messageBuf);
     if (rv != SECSuccess) {
         return SECFailure;
diff --git a/security/nss/tests/ssl/ssl.sh b/security/nss/tests/ssl/ssl.sh
index 525855e100..3c3d4206b2 100644
--- a/security/nss/tests/ssl/ssl.sh
+++ b/security/nss/tests/ssl/ssl.sh
@@ -220,18 +220,20 @@ start_selfserv()
   else
       RSA_OPTIONS="-n ${HOSTADDR}-rsa-pss"
   fi
+  SERVER_VMIN=${SERVER_VMIN-ssl3}
+  SERVER_VMAX=${SERVER_VMAX-tls1.2}
   echo "selfserv starting at `date`"
   echo "selfserv -D -p ${PORT} -d ${P_R_SERVERDIR} ${RSA_OPTIONS} ${SERVER_OPTIONS} \\"
   echo "         ${ECC_OPTIONS} -S ${HOSTADDR}-dsa -w nss "$@" -i ${R_SERVERPID}\\"
-  echo "         -V ssl3:tls1.2 $verbose -H 1 &"
+  echo "         -V ${SERVER_VMIN}:${SERVER_VMAX} $verbose -H 1 &"
   if [ ${fileout} -eq 1 ]; then
       ${PROFTOOL} ${BINDIR}/selfserv -D -p ${PORT} -d ${P_R_SERVERDIR} ${RSA_OPTIONS} ${SERVER_OPTIONS} \
-               ${ECC_OPTIONS} -S ${HOSTADDR}-dsa -w nss "$@" -i ${R_SERVERPID} -V ssl3:tls1.2 $verbose -H 1 \
+               ${ECC_OPTIONS} -S ${HOSTADDR}-dsa -w nss "$@" -i ${R_SERVERPID} -V ${SERVER_VMIN}:${SERVER_VMAX} $verbose -H 1 \
                > ${SERVEROUTFILE} 2>&1 &
       RET=$?
   else
       ${PROFTOOL} ${BINDIR}/selfserv -D -p ${PORT} -d ${P_R_SERVERDIR} ${RSA_OPTIONS} ${SERVER_OPTIONS} \
-               ${ECC_OPTIONS} -S ${HOSTADDR}-dsa -w nss "$@" -i ${R_SERVERPID} -V ssl3:tls1.2 $verbose -H 1 &
+               ${ECC_OPTIONS} -S ${HOSTADDR}-dsa -w nss "$@" -i ${R_SERVERPID} -V ${SERVER_VMIN}:${SERVER_VMAX} $verbose -H 1 &
       RET=$?
   fi
 
@@ -388,6 +390,8 @@ ssl_auth()
   do
       echo "${testname}" | grep "don't require client auth" > /dev/null
       CAUTH=$?
+      echo "${testname}" | grep "TLS 1.3" > /dev/null
+      TLS13=$?
 
       if [ "${CLIENT_MODE}" = "fips" -a "${CAUTH}" -eq 0 ] ; then
           echo "$SCRIPTNAME: skipping  $testname (non-FIPS only)"
@@ -399,6 +403,13 @@ ssl_auth()
               cparam=`echo $cparam | sed -e "s/Host/$HOST/g" -e "s/Dom/$DOMSUF/g" `
               sparam=`echo $sparam | sed -e "s/Host/$HOST/g" -e "s/Dom/$DOMSUF/g" `
           fi
+	  # SSL3 cannot be used with TLS 1.3
+	  unset SERVER_VMIN
+	  unset SERVER_VMAX
+	  if [ $TLS13 -eq 0 ] ; then
+	      SERVER_VMIN=tls1.0
+	      SERVER_VMAX=tls1.3
+	  fi
           start_selfserv `echo "$sparam" | sed -e 's,_, ,g'`
 
           echo "tstclnt -4 -p ${PORT} -h ${HOSTADDR} -f -d ${P_R_CLIENTDIR} $verbose ${CLIENT_OPTIONS} \\"
@@ -669,9 +680,18 @@ ssl_crl_ssl()
   ignore_blank_lines ${SSLAUTH} | \
   while read ectype value sparam cparam testname
   do
+    echo "${testname}" | grep "TLS 1.3" > /dev/null
+    TLS13=$?
     if [ "$ectype" = "SNI" ]; then
         continue
     else
+        # SSL3 cannot be used with TLS 1.3
+        unset SERVER_VMIN
+        unset SERVER_VMAX
+        if [ $TLS13 -eq 0 ] ; then
+            SERVER_VMIN=tls1.0
+            SERVER_VMAX=tls1.3
+        fi
         servarg=`echo $sparam | awk '{r=split($0,a,"-r") - 1;print r;}'`
         pwd=`echo $cparam | grep nss`
         user=`echo $cparam | grep TestUser`
@@ -1039,7 +1059,7 @@ ssl_crl_cache()
   rm -f ${SSLAUTH_TMP}
   echo ${SSLAUTH_TMP}
 
-  grep -- " $SERV_ARG " ${SSLAUTH} | grep -v "^#" | grep -v none | grep -v bogus > ${SSLAUTH_TMP}
+  grep -- " $SERV_ARG " ${SSLAUTH} | grep -v "^#" | grep -v none | grep -v bogus | grep -v 'post hs' > ${SSLAUTH_TMP}
   echo $?
   while [ $? -eq 0 -a -f ${SSLAUTH_TMP} ]
     do
diff --git a/security/nss/tests/ssl/sslauth.txt b/security/nss/tests/ssl/sslauth.txt
index 82d1ddea48..a84630f066 100644
--- a/security/nss/tests/ssl/sslauth.txt
+++ b/security/nss/tests/ssl/sslauth.txt
@@ -38,6 +38,10 @@
   noECC     1       -r_-r_-r_-r  -V_ssl3:ssl3_-w_nss_-n_none     SSL3 Require client auth on 2nd hs (client does not provide auth)
   noECC     1       -r_-r_-r_-r  -V_ssl3:ssl3_-n_TestUser_-w_bogus SSL3 Require client auth on 2nd hs (bad password)
   noECC     0       -r_-r_-r_-r  -V_ssl3:ssl3_-n_TestUser_-w_nss SSL3 Require client auth on 2nd hs (client auth)
+  noECC     0       -r_-r_-r_-E  -V_tls1.3:tls1.3_-E_-n_TestUser_-w_nss TLS 1.3 Request don't require client auth on post hs (client auth)
+  noECC     0       -r_-r_-r_-r_-E  -V_tls1.3:tls1.3_-E_-n_TestUser_-w_nss TLS 1.3 Require client auth on post hs (client auth)
+  noECC     0       -r_-r_-r_-E  -V_tls1.3:tls1.3_-E_-n_none_-w_nss TLS 1.3 Request don't require client auth on post hs (client does not provide auth)
+  noECC     1       -r_-r_-r_-r_-E  -V_tls1.3:tls1.3_-E_-n_none_-w_nss TLS 1.3 Require client auth on post hs (client does not provide auth)
 #
 # Use EC cert for client authentication
 #