diff --git a/unit/test-crypto.c b/unit/test-crypto.c
index 5fb1c64..8d65707 100644
--- a/unit/test-crypto.c
+++ b/unit/test-crypto.c
@@ -38,6 +38,8 @@ struct test_data {
 	const uint8_t *msg;
 	uint16_t msg_len;
 	const uint8_t *t;
+	const uint8_t *key;
+	uint32_t cnt;
 };
 
 static const uint8_t key[] = {
@@ -54,7 +56,8 @@ static const uint8_t t_msg_1[] = {
 static const struct test_data test_data_1 = {
 	.msg = msg_1,
 	.msg_len = 0,
-	.t = t_msg_1
+	.t = t_msg_1,
+	.key = key,
 };
 
 static const uint8_t msg_2[] = {
@@ -70,7 +73,8 @@ static const uint8_t t_msg_2[] = {
 static const struct test_data test_data_2 = {
 	.msg = msg_2,
 	.msg_len = 16,
-	.t = t_msg_2
+	.t = t_msg_2,
+	.key = key,
 };
 
 static const uint8_t msg_3[] = {
@@ -87,7 +91,8 @@ static const uint8_t t_msg_3[12] = {
 static const struct test_data test_data_3 = {
 	.msg = msg_3,
 	.msg_len = 40,
-	.t = t_msg_3
+	.t = t_msg_3,
+	.key = key,
 };
 
 static const uint8_t msg_4[] = {
@@ -106,7 +111,30 @@ static const uint8_t t_msg_4[12] = {
 static const struct test_data test_data_4 = {
 	.msg = msg_4,
 	.msg_len = 64,
-	.t = t_msg_4
+	.t = t_msg_4,
+	.key = key,
+};
+
+static const uint8_t msg_5[] = {
+		0xd2, 0x12, 0x00, 0x13, 0x37
+};
+
+static const uint8_t key_5[] = {
+		0x50, 0x5E, 0x42, 0xDF, 0x96, 0x91, 0xEC, 0x72, 0xD3, 0x1F,
+		0xCD, 0xFB, 0xEB, 0x64, 0x1B, 0x61
+};
+
+static const uint8_t t_msg_5[] = {
+		0x01, 0x00, 0x00, 0x00, 0xF1, 0x87, 0x1E, 0x93, 0x3C, 0x90,
+		0x0F, 0xf2
+};
+
+static const struct test_data test_data_5 = {
+	.msg = msg_5,
+	.msg_len = sizeof(msg_5),
+	.t = t_msg_5,
+	.cnt = 1,
+	.key = key_5,
 };
 
 static void print_debug(const char *str, void *user_data)
@@ -130,7 +158,7 @@ static void test_sign(gconstpointer data)
 	const struct test_data *d = data;
 
 	memset(t, 0, 12);
-	if (!bt_crypto_sign_att(crypto, key, d->msg, d->msg_len, 0, t))
+	if (!bt_crypto_sign_att(crypto, d->key, d->msg, d->msg_len, d->cnt, t))
 		g_assert(true);
 
 	tester_debug("Result T:");
@@ -157,6 +185,7 @@ int main(int argc, char *argv[])
 	tester_add("/crypto/sign_att_2", &test_data_2, NULL, test_sign, NULL);
 	tester_add("/crypto/sign_att_3", &test_data_3, NULL, test_sign, NULL);
 	tester_add("/crypto/sign_att_4", &test_data_4, NULL, test_sign, NULL);
+	tester_add("/crypto/sign_att_5", &test_data_5, NULL, test_sign, NULL);
 
 	exit_status = tester_run();