Add test cases for ASN.1 ENUMERATED tag

Add test cases for writing and parsing ASN.1 ENUMERATED
tag values.

Signed-off-by: Mykhailo Sopiha <mykhailo.sopiha@linaro.org>

tests/suites/test_suite_asn1parse.data

@@ -286,6 +286,90 @@ get_integer:"010101":"":MBEDTLS_ERR_ASN1_UNEXPECTED_TAG
 INTEGER too large for mpi
 get_mpi_too_large:
 
+ENUMERATED 0
+get_enum:"0A0100":"0":0
+
+ENUMERATED 0, extra leading 0
+get_enum:"0A020000":"0":0
+
+ENUMERATED 1
+get_enum:"0A0101":"1":0
+
+ENUMERATED 1, extra leading 0
+get_enum:"0A020001":"1":0
+
+ENUMERATED 0x7f
+get_enum:"0A017f":"7f":0
+
+ENUMERATED 0x80
+get_enum:"0A020080":"80":0
+
+ENUMERATED 0x80, extra leading 0
+get_enum:"0A03000080":"80":0
+
+ENUMERATED 0xff
+get_enum:"0A0200ff":"ff":0
+
+ENUMERATED 0x7fff
+get_enum:"0A027fff":"7fff":0
+
+ENUMERATED 0x12345678
+get_enum:"0A0412345678":"12345678":0
+
+ENUMERATED 0x12345678, extra leading 0
+get_enum:"0A050012345678":"12345678":0
+
+ENUMERATED 0x7fffffff
+get_enum:"0A047fffffff":"7fffffff":0
+
+ENUMERATED 0x7fffffff, extra leading 0
+get_enum:"0A05007fffffff":"7fffffff":0
+
+ENUMERATED 0x80000000
+get_enum:"0A050080000000":"80000000":0
+
+ENUMERATED 0xffffffff
+get_enum:"0A0500ffffffff":"ffffffff":0
+
+ENUMERATED 0x100000000
+get_enum:"0A050100000000":"0100000000":0
+
+ENUMERATED -1
+get_enum:"0A01ff":"-1":0
+
+ENUMERATED -1, extra leading ff
+get_enum:"0A02ffff":"-1":0
+
+ENUMERATED -0x7f
+get_enum:"0A0181":"-7f":0
+
+ENUMERATED -0x80
+get_enum:"0A0180":"-80":0
+
+ENUMERATED -0x81
+get_enum:"0A02ff7f":"-81":0
+
+ENUMERATED -0xff
+get_enum:"0A02ff01":"-ff":0
+
+ENUMERATED -0x100
+get_enum:"0A02ff00":"-100":0
+
+ENUMERATED -0x7fffffff
+get_enum:"0A0480000001":"-7fffffff":0
+
+ENUMERATED -0x80000000
+get_enum:"0A0480000000":"-80000000":0
+
+ENUMERATED -0x80000001
+get_enum:"0A05ff7fffffff":"-80000001":0
+
+ENUMERATED -0xffffffff
+get_enum:"0A05ff00000001":"-ffffffff":0
+
+ENUMERATED -0x100000000
+get_enum:"0A05ff00000000":"-100000000":0
+
 BIT STRING: empty
 get_bitstring:"0300":0:0:MBEDTLS_ERR_ASN1_OUT_OF_DATA:MBEDTLS_ERR_ASN1_INVALID_DATA
 

tests/suites/test_suite_asn1parse.function

@@ -393,6 +393,49 @@ exit:
 }
 /* END_CASE */
 
+/* BEGIN_CASE */
+void get_enum( const data_t *input,
+               const char *expected_hex, int expected_result )
+{
+    unsigned char *p;
+    long expected_value;
+    int expected_result_for_enum = expected_result;
+    int val;
+    int ret;
+
+    errno = 0;
+    expected_value = strtol( expected_hex, NULL, 16 );
+    if( expected_result == 0 &&
+        ( errno == ERANGE
+#if LONG_MAX > INT_MAX
+          || expected_value > INT_MAX || expected_value < INT_MIN
+#endif
+            ) )
+    {
+        /* The library returns the dubious error code INVALID_LENGTH
+         * for integers that are out of range. */
+        expected_result_for_enum = MBEDTLS_ERR_ASN1_INVALID_LENGTH;
+    }
+    if( expected_result == 0 && expected_value < 0 )
+    {
+        /* The library does not support negative INTEGERs and
+         * returns the dubious error code INVALID_LENGTH.
+         * Test that we preserve the historical behavior. If we
+         * decide to change the behavior, we'll also change this test. */
+        expected_result_for_enum = MBEDTLS_ERR_ASN1_INVALID_LENGTH;
+    }
+
+    p = input->x;
+    ret = mbedtls_asn1_get_enum( &p, input->x + input->len, &val );
+    TEST_EQUAL( ret, expected_result_for_enum );
+    if( ret == 0 )
+    {
+        TEST_EQUAL( val, expected_value );
+        TEST_ASSERT( p == input->x + input->len );
+    }
+}
+/* END_CASE */
+
 /* BEGIN_CASE depends_on:MBEDTLS_BIGNUM_C */
 void get_mpi_too_large( )
 {

tests/suites/test_suite_asn1write.data

@@ -49,6 +49,48 @@ mbedtls_asn1_write_int:0x12345678:"020412345678"
 ASN.1 Write int 2147483647
 mbedtls_asn1_write_int:0x7fffffff:"02047fffffff"
 
+ASN.1 Write enum 0
+mbedtls_asn1_write_enum:0:"0A0100"
+
+ASN.1 Write enum 1
+mbedtls_asn1_write_enum:1:"0A0101"
+
+ASN.1 Write enum 127
+mbedtls_asn1_write_enum:0x7f:"0A017f"
+
+ASN.1 Write enum 128
+mbedtls_asn1_write_enum:0x80:"0A020080"
+
+ASN.1 Write enum 255
+mbedtls_asn1_write_enum:0xff:"0A0200ff"
+
+ASN.1 Write enum 256
+mbedtls_asn1_write_enum:0x100:"0A020100"
+
+ASN.1 Write enum 32767
+mbedtls_asn1_write_enum:0x7fff:"0A027fff"
+
+ASN.1 Write enum 32768
+mbedtls_asn1_write_enum:0x8000:"0A03008000"
+
+ASN.1 Write enum 65535
+mbedtls_asn1_write_enum:0xffff:"0A0300ffff"
+
+ASN.1 Write enum 65536
+mbedtls_asn1_write_enum:0x10000:"0A03010000"
+
+ASN.1 Write enum 8388607
+mbedtls_asn1_write_enum:0x7fffff:"0A037fffff"
+
+ASN.1 Write enum 8388608
+mbedtls_asn1_write_enum:0x800000:"0A0400800000"
+
+ASN.1 Write enum 0x12345678
+mbedtls_asn1_write_enum:0x12345678:"0A0412345678"
+
+ASN.1 Write enum 2147483647
+mbedtls_asn1_write_enum:0x7fffffff:"0A047fffffff"
+
 #ASN.1 Write mpi 0
 #mbedtls_asn1_write_mpi:"00":"020100"
 

tests/suites/test_suite_asn1write.function

@@ -117,6 +117,27 @@ exit:
 }
 /* END_CASE */
 
+
+/* BEGIN_CASE */
+void mbedtls_asn1_write_enum( int val, data_t *expected )
+{
+    generic_write_data_t data = { NULL, NULL, NULL, NULL, 0 };
+    int ret;
+
+    for( data.size = 0; data.size < expected->len + 1; data.size++ )
+    {
+        if( ! generic_write_start_step( &data ) )
+            goto exit;
+        ret = mbedtls_asn1_write_enum( &data.p, data.start, val );
+        if( ! generic_write_finish_step( &data, expected, ret ) )
+            goto exit;
+    }
+
+exit:
+    mbedtls_free( data.output );
+}
+/* END_CASE */
+
 /* BEGIN_CASE depends_on:MBEDTLS_BIGNUM_C */
 void mbedtls_asn1_write_mpi( data_t *val, data_t *expected )
 {