diff --git a/tests/psa-client-server/psasim/src/psa_sim_generate.pl b/tests/psa-client-server/psasim/src/psa_sim_generate.pl
index bc63975..e0e9b19 100755
--- a/tests/psa-client-server/psasim/src/psa_sim_generate.pl
+++ b/tests/psa-client-server/psasim/src/psa_sim_generate.pl
@@ -566,13 +566,6 @@
     size_t $n2;
 EOF
             push(@buffers, $n1);        # Add to the list to be free()d at end
-        } elsif ($argtype =~ /^(const )?psa_key_production_parameters_t$/) {
-            my ($n1, $n2) = split(/,\s*/, $argname);
-            print $fh <<EOF;
-    psa_key_production_parameters_t *$n1 = NULL;
-    size_t $n2;
-EOF
-            push(@buffers, $n1);        # Add to the list to be free()d at end
         } else {
             $argname =~ s/^\*//;        # Remove any leading *
             my $pointer = ($argtype =~ /^psa_\w+_operation_t/) ? "*" : "";
@@ -628,17 +621,6 @@
         goto fail;
     }
 EOF
-        } elsif ($argtype =~ /^(const )?psa_key_production_parameters_t$/) {
-            my ($n1, $n2) = split(/,\s*/, $argname);
-            print $fh <<EOF;
-
-    ok = psasim_deserialise_${argtype}(
-        &pos, &remaining,
-        &$n1, &$n2);
-    if (!ok) {
-        goto fail;
-    }
-EOF
         } else {
             $argname =~ s/^\*//;        # Remove any leading *
             my $server_specific = ($argtype =~ /^psa_\w+_operation_t/) ? "server_" : "";
@@ -741,16 +723,6 @@
         goto fail;
     }
 EOF
-        } elsif ($argtype eq "psa_key_production_parameters_t") {
-            print $fh <<EOF;
-
-    ok = psasim_serialise_psa_key_production_parameters_t(
-        &rpos, &rremain,
-        $argname);
-    if (!ok) {
-        goto fail;
-    }
-EOF
         } else {
             if ($argname =~ /^\*/) {
                 $argname =~ s/^\*//;    # since it's already a pointer
@@ -1033,9 +1005,6 @@
         if ($argtype =~ /^(const )?buffer$/) {
             my ($n1, $n2) = split(/,\s*/, $argname);
             print $fh "        $n1, $n2";
-        } elsif ($argtype =~ /^(const )?psa_key_production_parameters_t$/) {
-            my ($n1, $n2) = split(/,\s*/, $argname);
-            print $fh "        $n1, $n2";
         } else {
             $argname =~ s/^\*/\&/;      # Replace leading * with &
             if ($is_server && $argtype =~ /^psa_\w+_operation_t/) {
@@ -1071,10 +1040,6 @@
             my $const = length($1) ? "const " : "";
             my ($n1, $n2) = split(/,/, $argname);
             print $fh "    ${const}uint8_t *$n1, size_t $n2";
-        } elsif ($argtype =~ /^(const )?psa_key_production_parameters_t$/) {
-            my $const = length($1) ? "const " : "";
-            my ($n1, $n2) = split(/,/, $argname);
-            print $fh "    ${const}psa_key_production_parameters_t *$n1, size_t $n2";
         } else {
             print $fh "    $ctypename$argname";
         }
@@ -1184,19 +1149,6 @@
                         $i++;                   # We're using the next param here
                         my $nname = $1;
                         $name .= ", " . $nname;
-                    } elsif ($arg =~ /^((const)\s+)?psa_key_production_parameters_t\s*\*\s*(\w+)$/) {
-                        $type = "psa_key_production_parameters_t";
-                        $is_output = (length($1) == 0) ? 1 : 0;
-                        $type = "const psa_key_production_parameters_t" if !$is_output;
-                        $ctype = "";
-                        $name = $3;
-                        #print("$arg: $name: might be a psa_key_production_parameters_t?\n");
-                        die("$arg: not a psa_key_production_parameters_t 1!\n") if $i == $#args;
-                        my $next = $args[$i + 1];
-                        die("$arg: $func: $name: $next: not a psa_key_production_parameters_t 2!\n") if $next !~ /^size_t\s+(${name}_\w+)$/;
-                        $i++;                   # We're using the next param here
-                        my $nname = $1;
-                        $name .= ", " . $nname;
                     } elsif ($arg =~ /^((const)\s+)?(\w+)\s*\*(\w+)$/) {
                         ($type, $name) = ($3, "*" . $4);
                         $ctype = $1 . $type . " ";
diff --git a/tests/psa-client-server/psasim/src/psa_sim_serialise.pl b/tests/psa-client-server/psasim/src/psa_sim_serialise.pl
index 75e6cd0..31c93ae 100755
--- a/tests/psa-client-server/psasim/src/psa_sim_serialise.pl
+++ b/tests/psa-client-server/psasim/src/psa_sim_serialise.pl
@@ -38,7 +38,7 @@
 my @types = qw(unsigned-int int size_t
                uint16_t uint32_t uint64_t
                buffer
-               psa_key_production_parameters_t
+               psa_custom_key_parameters_t
                psa_status_t psa_algorithm_t psa_key_derivation_step_t
                psa_hash_operation_t
                psa_aead_operation_t
@@ -66,8 +66,6 @@
     for my $type (@types) {
         if ($type eq "buffer") {
             print declare_buffer_functions();
-        } elsif ($type eq "psa_key_production_parameters_t") {
-            print declare_psa_key_production_parameters_t_functions();
         } else {
             print declare_needs($type, "");
             print declare_serialise($type, "");
@@ -98,8 +96,6 @@
     for my $type (@types) {
         if ($type eq "buffer") {
             print define_buffer_functions();
-        } elsif ($type eq "psa_key_production_parameters_t") {
-            print define_psa_key_production_parameters_t_functions();
         } elsif (exists($isa{$type})) {
             print define_needs_isa($type, $isa{$type});
             print define_serialise_isa($type, $isa{$type});
@@ -304,62 +300,6 @@
 EOF
 }
 
-sub declare_psa_key_production_parameters_t_functions
-{
-    return <<'EOF';
-
-/** Return how much space is needed by \c psasim_serialise_psa_key_production_parameters_t()
- *  to serialise a psa_key_production_parameters_t (a structure with a flexible array member).
- *
- * \param params             Pointer to the struct to be serialised
- *                           (needed in case some serialisations are value-
- *                           dependent).
- * \param data_length        Number of bytes in the data[] of the struct to be serialised.
- *
- * \return                   The number of bytes needed in the serialisation buffer by
- *                           \c psasim_serialise_psa_key_production_parameters_t() to serialise
- *                           the specified structure.
- */
-size_t psasim_serialise_psa_key_production_parameters_t_needs(
-    const psa_key_production_parameters_t *params,
-    size_t buffer_size);
-
-/** Serialise a psa_key_production_parameters_t.
- *
- * \param pos[in,out]        Pointer to a `uint8_t *` holding current position
- *                           in the buffer.
- * \param remaining[in,out]  Pointer to a `size_t` holding number of bytes
- *                           remaining in the buffer.
- * \param params             Pointer to the structure to be serialised.
- * \param data_length        Number of bytes in the data[] of the struct to be serialised.
- *
- * \return                   \c 1 on success ("okay"), \c 0 on error.
- */
-int psasim_serialise_psa_key_production_parameters_t(uint8_t **pos,
-                                                     size_t *remaining,
-                                                     const psa_key_production_parameters_t *params,
-                                                     size_t data_length);
-
-/** Deserialise a psa_key_production_parameters_t.
- *
- * \param pos[in,out]        Pointer to a `uint8_t *` holding current position
- *                           in the serialisation buffer.
- * \param remaining[in,out]  Pointer to a `size_t` holding number of bytes
- *                           remaining in the serialisation buffer.
- * \param params             Pointer to a `psa_key_production_parameters_t *` to
- *                           receive the address of a newly-allocated structure,
- *                           which the caller must `free()`.
- * \param data_length        Pointer to a `size_t` to receive the number of
- *                           bytes in the data[] member of the structure deserialised.
- *
- * \return                   \c 1 on success ("okay"), \c 0 on error.
- */
-int psasim_deserialise_psa_key_production_parameters_t(uint8_t **pos, size_t *remaining,
-                                                       psa_key_production_parameters_t **params,
-                                                       size_t *buffer_length);
-EOF
-}
-
 sub h_header
 {
     return <<'EOF';
@@ -816,105 +756,6 @@
 EOF
 }
 
-sub define_psa_key_production_parameters_t_functions
-{
-    return <<'EOF';
-
-#define SER_TAG_SIZE        4
-
-size_t psasim_serialise_psa_key_production_parameters_t_needs(
-    const psa_key_production_parameters_t *params,
-    size_t data_length)
-{
-    /* We will serialise with 4-byte tag = "PKPP" + 4-byte overall length at the beginning,
-     * followed by size_t data_length, then the actual data from the structure.
-     */
-    return SER_TAG_SIZE + sizeof(uint32_t) + sizeof(data_length) + sizeof(*params) + data_length;
-}
-
-int psasim_serialise_psa_key_production_parameters_t(uint8_t **pos,
-                                                     size_t *remaining,
-                                                     const psa_key_production_parameters_t *params,
-                                                     size_t data_length)
-{
-    if (data_length > UINT32_MAX / 2) {       /* arbitrary limit */
-        return 0;       /* too big to serialise */
-    }
-
-    /* We use 32-bit lengths, which should be enough for any reasonable usage :) */
-    /* (the UINT32_MAX / 2 above is an even more conservative check to avoid overflow here) */
-    uint32_t len = (uint32_t) (sizeof(data_length) + sizeof(*params) + data_length);
-    if (*remaining < SER_TAG_SIZE + sizeof(uint32_t) + len) {
-        return 0;
-    }
-
-    char tag[SER_TAG_SIZE] = "PKPP";
-
-    memcpy(*pos, tag, sizeof(tag));
-    memcpy(*pos + sizeof(tag), &len, sizeof(len));
-    *pos += sizeof(tag) + sizeof(len);
-    *remaining -= sizeof(tag) + sizeof(len);
-
-    memcpy(*pos, &data_length, sizeof(data_length));
-    memcpy(*pos + sizeof(data_length), params, sizeof(*params) + data_length);
-    *pos += sizeof(data_length) + sizeof(*params) + data_length;
-    *remaining -= sizeof(data_length) + sizeof(*params) + data_length;
-
-    return 1;
-}
-
-int psasim_deserialise_psa_key_production_parameters_t(uint8_t **pos,
-                                                       size_t *remaining,
-                                                       psa_key_production_parameters_t **params,
-                                                       size_t *data_length)
-{
-    if (*remaining < SER_TAG_SIZE + sizeof(uint32_t)) {
-        return 0;       /* can't even be an empty serialisation */
-    }
-
-    char tag[SER_TAG_SIZE] = "PKPP";    /* expected */
-    uint32_t len;
-
-    memcpy(&len, *pos + sizeof(tag), sizeof(len));
-
-    if (memcmp(*pos, tag, sizeof(tag)) != 0) {
-        return 0;       /* wrong tag */
-    }
-
-    *pos += sizeof(tag) + sizeof(len);
-    *remaining -= sizeof(tag) + sizeof(len);
-
-    if (*remaining < sizeof(*data_length)) {
-        return 0;       /* missing data_length */
-    }
-    memcpy(data_length, *pos, sizeof(*data_length));
-
-    if ((size_t) len != (sizeof(data_length) + sizeof(**params) + *data_length)) {
-        return 0;       /* wrong length */
-    }
-
-    if (*remaining < sizeof(*data_length) + sizeof(**params) + *data_length) {
-        return 0;       /* not enough data provided */
-    }
-
-    *pos += sizeof(data_length);
-    *remaining -= sizeof(data_length);
-
-    psa_key_production_parameters_t *out = malloc(sizeof(**params) + *data_length);
-    if (out == NULL) {
-        return 0;       /* allocation failure */
-    }
-
-    memcpy(out, *pos, sizeof(*out) + *data_length);
-    *pos += sizeof(*out) + *data_length;
-    *remaining -= sizeof(*out) + *data_length;
-
-    *params = out;
-
-    return 1;
-}
-EOF
-}
 
 sub c_header
 {