diff --git a/programs/ssl/ssl_client2.c b/programs/ssl/ssl_client2.c
index f741d99..94b4d4f 100644
--- a/programs/ssl/ssl_client2.c
+++ b/programs/ssl/ssl_client2.c
@@ -115,6 +115,7 @@
 #define DFL_USE_SRTP            0
 #define DFL_SRTP_FORCE_PROFILE  0
 #define DFL_SRTP_MKI            ""
+#define DFL_KEY_OPAQUE_ALG      "none"
 
 #define GET_REQUEST "GET %s HTTP/1.0\r\nExtra-header: "
 #define GET_REQUEST_END "\r\n\r\n"
@@ -343,6 +344,13 @@
 #define USAGE_SERIALIZATION ""
 #endif
 
+#define USAGE_KEY_OPAQUE_ALGS \
+    "    key_opaque_algs=%%s  Allowed opaque key algorithms.\n"                      \
+    "                        coma-separated pair of values among the following:\n"   \
+    "                        rsa-sign-pkcs1, rsa-sign-pss, rsa-decrypt,\n"           \
+    "                        ecdsa-sign, ecdh, none (only acceptable for\n"          \
+    "                        the second value).\n"                                   \
+
 #if defined(MBEDTLS_SSL_PROTO_TLS1_3)
 #define USAGE_TLS1_3_KEY_EXCHANGE_MODES \
     "    tls13_kex_modes=%%s   default: all\n"     \
@@ -411,6 +419,7 @@
     USAGE_CURVES                                            \
     USAGE_SIG_ALGS                                          \
     USAGE_DHMLEN                                            \
+    USAGE_KEY_OPAQUE_ALGS                                   \
     "\n"
 
 #if defined(MBEDTLS_SSL_PROTO_TLS1_3)
@@ -523,6 +532,8 @@
     int use_srtp;               /* Support SRTP                             */
     int force_srtp_profile;     /* SRTP protection profile to use or all    */
     const char *mki;            /* The dtls mki value to use                */
+    const char *key_opaque_alg1; /* Allowed opaque key alg 1                */
+    const char *key_opaque_alg2; /* Allowed Opaque key alg 2                */
 } opt;
 
 #include "ssl_test_common_source.c"
@@ -885,6 +896,8 @@
     opt.use_srtp            = DFL_USE_SRTP;
     opt.force_srtp_profile  = DFL_SRTP_FORCE_PROFILE;
     opt.mki                 = DFL_SRTP_MKI;
+    opt.key_opaque_alg1     = DFL_KEY_OPAQUE_ALG;
+    opt.key_opaque_alg2     = DFL_KEY_OPAQUE_ALG;
 
     for( i = 1; i < argc; i++ )
     {
@@ -1308,6 +1321,12 @@
         {
             opt.mki = q;
         }
+        else if( strcmp( p, "key_opaque_algs" ) == 0 )
+        {
+            if ( key_opaque_alg_parse( q, &opt.key_opaque_alg1,
+                                          &opt.key_opaque_alg2 ) != 0 )
+                goto usage;
+        }
         else
             goto usage;
     }