diff --git a/src/tests/digest_test.c b/src/tests/digest_test.c index 33d00c70..c3a12885 100644 --- a/src/tests/digest_test.c +++ b/src/tests/digest_test.c @@ -38,27 +38,47 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); #include #include "digest_test.h" +/** Maximum number of digest test fragments */ +#define NUM_DIGEST_TEST_FRAG 8 + +/** A digest test fragment list */ +struct digest_test_fragments { + /** Fragment lengths */ + size_t len[NUM_DIGEST_TEST_FRAG]; +}; + +/** Digest test fragment lists */ +static struct digest_test_fragments digest_test_fragments[] = { + { { 0, -1UL, } }, + { { 1, 1, 1, 1, 1, 1, 1, 1 } }, + { { 2, 0, 23, 4, 6, 1, 0 } }, +}; + /** Number of sample iterations for profiling */ #define PROFILE_COUNT 16 /** - * Test digest algorithm + * Report a digest fragmented test result * - * @v digest Digest algorithm - * @v fragments Digest test fragment list, or NULL - * @v data Test data - * @v len Length of test data - * @v expected Expected digest value - * @ret ok Digest value is as expected + * @v test Digest test + * @v fragments Fragment list + * @v file Test code file + * @v line Test code line */ -int digest_test ( struct digest_algorithm *digest, - struct digest_test_fragments *fragments, - void *data, size_t len, void *expected ) { +void digest_frag_okx ( struct digest_test *test, + struct digest_test_fragments *fragments, + const char *file, unsigned int line ) { + struct digest_algorithm *digest = test->digest; uint8_t ctx[digest->ctxsize]; uint8_t out[digest->digestsize]; + const void *data = test->data; + size_t len = test->len; size_t frag_len = 0; unsigned int i; + /* Sanity check */ + okx ( test->expected_len == sizeof ( out ), file, line ); + /* Initialise digest */ digest_init ( digest, ctx ); @@ -78,7 +98,28 @@ int digest_test ( struct digest_algorithm *digest, digest_final ( digest, ctx, out ); /* Compare against expected output */ - return ( memcmp ( expected, out, sizeof ( out ) ) == 0 ); + okx ( memcmp ( test->expected, out, sizeof ( out ) ) == 0, file, line ); +} + +/** + * Report a digest test result + * + * @v test Digest test + * @v file Test code file + * @v line Test code line + */ +void digest_okx ( struct digest_test *test, const char *file, + unsigned int line ) { + unsigned int i; + + /* Test with a single pass */ + digest_frag_okx ( test, NULL, file, line ); + + /* Test with fragment lists */ + for ( i = 0 ; i < ( sizeof ( digest_test_fragments ) / + sizeof ( digest_test_fragments[0] ) ) ; i++ ) { + digest_frag_okx ( test, &digest_test_fragments[i], file, line ); + } } /** diff --git a/src/tests/digest_test.h b/src/tests/digest_test.h index 8bee3530..abf1b834 100644 --- a/src/tests/digest_test.h +++ b/src/tests/digest_test.h @@ -7,31 +7,109 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); #include #include -/** Maximum number of digest test fragments */ -#define NUM_DIGEST_TEST_FRAG 8 - -/** A digest test fragment list */ -struct digest_test_fragments { - /** Fragment lengths */ - size_t len[NUM_DIGEST_TEST_FRAG]; +/** A digest test */ +struct digest_test { + /** Digest algorithm */ + struct digest_algorithm *digest; + /** Test data */ + const void *data; + /** Length of test data */ + size_t len; + /** Expected digest value */ + const void *expected; + /** Expected digest length */ + size_t expected_len; }; -extern int digest_test ( struct digest_algorithm *digest, - struct digest_test_fragments *fragments, - void *data, size_t len, void *expected ); -extern unsigned long digest_cost ( struct digest_algorithm *digest ); +/** Define inline test data */ +#define DATA(...) { __VA_ARGS__ } + +/** Define inline expected digest value */ +#define DIGEST(...) { __VA_ARGS__ } /** - * Report digest test result + * Define a digest test * - * @v digest Digest algorithm - * @v fragments Digest test fragment list, or NULL - * @v data Test data - * @v len Length of test data - * @v expected Expected digest value + * @v name Test name + * @v DIGEST Digest algorithm + * @v DATA Test data + * @v EXPECTED Expected digest value + * @ret test Digest test */ -#define digest_ok( digest, fragments, data, len, expected ) do { \ - ok ( digest_test ( digest, fragments, data, len, expected ) ); \ - } while ( 0 ) +#define DIGEST_TEST( name, DIGEST, DATA, EXPECTED ) \ + static const uint8_t name ## _data[] = DATA; \ + static const uint8_t name ## _expected[] = EXPECTED; \ + static struct digest_test name = { \ + .digest = DIGEST, \ + .data = name ## _data, \ + .len = sizeof ( name ## _data ), \ + .expected = name ## _expected, \ + .expected_len = sizeof ( name ## _expected ), \ + }; + +/** Standard test vector: empty data */ +#define DIGEST_EMPTY DATA() + +/** Standard test vector: NIST string "abc" + * + * The NIST Cryptographic Toolkit examples for all digest algorithms + * include a test vector which is the unterminated string + * + * "abc" + */ +#define DIGEST_NIST_ABC \ + DATA ( 0x61, 0x62, 0x63 ) + +/** Standard test vector: NIST string "abc...opq" + * + * The NIST Cryptographic Toolkit examples for all 32-bit digest + * algorithms (SHA-1 and the SHA-256 family) include a test vector + * which is the unterminated string + * + * "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq" + */ +#define DIGEST_NIST_ABC_OPQ \ + DATA ( 0x61, 0x62, 0x63, 0x64, 0x62, 0x63, 0x64, 0x65, 0x63, \ + 0x64, 0x65, 0x66, 0x64, 0x65, 0x66, 0x67, 0x65, 0x66, \ + 0x67, 0x68, 0x66, 0x67, 0x68, 0x69, 0x67, 0x68, 0x69, \ + 0x6a, 0x68, 0x69, 0x6a, 0x6b, 0x69, 0x6a, 0x6b, 0x6c, \ + 0x6a, 0x6b, 0x6c, 0x6d, 0x6b, 0x6c, 0x6d, 0x6e, 0x6c, \ + 0x6d, 0x6e, 0x6f, 0x6d, 0x6e, 0x6f, 0x70, 0x6e, 0x6f, \ + 0x70, 0x71 ) + +/** Standard test vector: NIST string "abc...stu" + * + * The NIST Cryptographic Toolkit examples for all 64-bit digest + * algorithms (SHA-512 family) include a test vector which is the + * unterminated string + * + * "abcdefghbcdefghicdefghijdefghijkefghijklfghijklmghijklmn" + * "hijklmnoijklmnopjklmnopqklmnopqrlmnopqrsmnopqrstnopqrstu" + */ +#define DIGEST_NIST_ABC_STU \ + DATA ( 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x62, \ + 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x63, 0x64, \ + 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x64, 0x65, 0x66, \ + 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x65, 0x66, 0x67, 0x68, \ + 0x69, 0x6a, 0x6b, 0x6c, 0x66, 0x67, 0x68, 0x69, 0x6a, \ + 0x6b, 0x6c, 0x6d, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, \ + 0x6d, 0x6e, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, \ + 0x6f, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, \ + 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x6b, \ + 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x6c, 0x6d, \ + 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x6d, 0x6e, 0x6f, \ + 0x70, 0x71, 0x72, 0x73, 0x74, 0x6e, 0x6f, 0x70, 0x71, \ + 0x72, 0x73, 0x74, 0x75 ) + +/** + * Report a digest test result + * + * @v test Digest test + */ +#define digest_ok(test) digest_okx ( test, __FILE__, __LINE__ ) + +extern void digest_okx ( struct digest_test *test, const char *file, + unsigned int line ); +extern unsigned long digest_cost ( struct digest_algorithm *digest ); #endif /* _DIGEST_TEST_H */ diff --git a/src/tests/md5_test.c b/src/tests/md5_test.c index ccd0f96d..e9ed2716 100644 --- a/src/tests/md5_test.c +++ b/src/tests/md5_test.c @@ -27,74 +27,46 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); * * MD5 tests * + * Test inputs borrowed from NIST SHA-1 tests, with results calculated + * using md5sum. */ -#include +/* Forcibly enable assertions */ +#undef NDEBUG + #include #include #include "digest_test.h" -/** An MD5 test vector */ -struct md5_test_vector { - /** Test data */ - void *data; - /** Test data length */ - size_t len; - /** Expected digest */ - uint8_t digest[MD5_DIGEST_SIZE]; -}; +/* Empty test vector (digest obtained from "md5sum /dev/null") */ +DIGEST_TEST ( md5_empty, &md5_algorithm, DIGEST_EMPTY, + DIGEST ( 0xd4, 0x1d, 0x8c, 0xd9, 0x8f, 0x00, 0xb2, 0x04, 0xe9, + 0x80, 0x09, 0x98, 0xec, 0xf8, 0x42, 0x7e ) ); -/** MD5 test vectors */ -static struct md5_test_vector md5_test_vectors[] = { - /* Test inputs borrowed from SHA-1 tests, with results - * calculated using md5sum. - */ - { NULL, 0, - { 0xd4, 0x1d, 0x8c, 0xd9, 0x8f, 0x00, 0xb2, 0x04, - 0xe9, 0x80, 0x09, 0x98, 0xec, 0xf8, 0x42, 0x7e } }, - { "abc", 3, - { 0x90, 0x01, 0x50, 0x98, 0x3c, 0xd2, 0x4f, 0xb0, - 0xd6, 0x96, 0x3f, 0x7d, 0x28, 0xe1, 0x7f, 0x72 } }, - { "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq", 56, - { 0x82, 0x15, 0xef, 0x07, 0x96, 0xa2, 0x0b, 0xca, - 0xaa, 0xe1, 0x16, 0xd3, 0x87, 0x6c, 0x66, 0x4a } }, -}; +/* NIST test vector "abc" (digest obtained from "md5sum ") */ +DIGEST_TEST ( md5_nist_abc, &md5_algorithm, DIGEST_NIST_ABC, + DIGEST ( 0x90, 0x01, 0x50, 0x98, 0x3c, 0xd2, 0x4f, 0xb0, 0xd6, + 0x96, 0x3f, 0x7d, 0x28, 0xe1, 0x7f, 0x72 ) ); -/** MD5 test fragment lists */ -static struct digest_test_fragments md5_test_fragments[] = { - { { 0, -1UL, } }, - { { 1, 1, 1, 1, 1, 1, 1, 1 } }, - { { 2, 0, 23, 4, 6, 1, 0 } }, -}; +/* NIST test vector "abc...opq" (digest obtained from "md5sum ") */ +DIGEST_TEST ( md5_nist_abc_opq, &md5_algorithm, DIGEST_NIST_ABC_OPQ, + DIGEST ( 0x82, 0x15, 0xef, 0x07, 0x96, 0xa2, 0x0b, 0xca, 0xaa, + 0xe1, 0x16, 0xd3, 0x87, 0x6c, 0x66, 0x4a ) ); /** * Perform MD5 self-test * */ static void md5_test_exec ( void ) { - struct digest_algorithm *digest = &md5_algorithm; - struct md5_test_vector *test; - unsigned long cost; - unsigned int i; - unsigned int j; - /* Correctness test */ - for ( i = 0 ; i < ( sizeof ( md5_test_vectors ) / - sizeof ( md5_test_vectors[0] ) ) ; i++ ) { - test = &md5_test_vectors[i]; - /* Test with a single pass */ - digest_ok ( digest, NULL, test->data, test->len, test->digest ); - /* Test with fragment lists */ - for ( j = 0 ; j < ( sizeof ( md5_test_fragments ) / - sizeof ( md5_test_fragments[0] ) ) ; j++ ){ - digest_ok ( digest, &md5_test_fragments[j], - test->data, test->len, test->digest ); - } - } + /* Correctness tests */ + digest_ok ( &md5_empty ); + digest_ok ( &md5_nist_abc ); + digest_ok ( &md5_nist_abc_opq ); - /* Speed test */ - cost = digest_cost ( digest ); - DBG ( "MD5 required %ld cycles per byte\n", cost ); + /* Speed tests */ + DBG ( "MD5 required %ld cycles per byte\n", + digest_cost ( &md5_algorithm ) ); } /** MD5 self-test */ diff --git a/src/tests/sha1_test.c b/src/tests/sha1_test.c index c2ccf84e..9f1d7568 100644 --- a/src/tests/sha1_test.c +++ b/src/tests/sha1_test.c @@ -27,79 +27,51 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); * * SHA-1 tests * + * NIST test vectors are taken from + * + * http://csrc.nist.gov/groups/ST/toolkit/documents/Examples/SHA1.pdf + * */ -#include +/* Forcibly enable assertions */ +#undef NDEBUG + #include #include #include "digest_test.h" -/** An SHA-1 test vector */ -struct sha1_test_vector { - /** Test data */ - void *data; - /** Test data length */ - size_t len; - /** Expected digest */ - uint8_t digest[SHA1_DIGEST_SIZE]; -}; +/* Empty test vector (digest obtained from "sha1sum /dev/null") */ +DIGEST_TEST ( sha1_empty, &sha1_algorithm, DIGEST_EMPTY, + DIGEST ( 0xda, 0x39, 0xa3, 0xee, 0x5e, 0x6b, 0x4b, 0x0d, 0x32, + 0x55, 0xbf, 0xef, 0x95, 0x60, 0x18, 0x90, 0xaf, 0xd8, + 0x07, 0x09 ) ); -/** SHA-1 test vectors */ -static struct sha1_test_vector sha1_test_vectors[] = { - /* Empty test data - * - * Expected digest value obtained from "sha1sum /dev/null" - */ - { NULL, 0, - { 0xda, 0x39, 0xa3, 0xee, 0x5e, 0x6b, 0x4b, 0x0d, 0x32, 0x55, - 0xbf, 0xef, 0x95, 0x60, 0x18, 0x90, 0xaf, 0xd8, 0x07, 0x09 } }, - /* Test data and expected digests taken from the NIST - * Cryptographic Toolkit Algorithm Examples at - * http://csrc.nist.gov/groups/ST/toolkit/documents/Examples/SHA1.pdf - */ - { "abc", 3, - { 0xa9, 0x99, 0x3e, 0x36, 0x47, 0x06, 0x81, 0x6a, 0xba, 0x3e, - 0x25, 0x71, 0x78, 0x50, 0xc2, 0x6c, 0x9c, 0xd0, 0xd8, 0x9d } }, - { "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq", 56, - { 0x84, 0x98, 0x3e, 0x44, 0x1c, 0x3b, 0xd2, 0x6e, 0xba, 0xae, - 0x4a, 0xa1, 0xf9, 0x51, 0x29, 0xe5, 0xe5, 0x46, 0x70, 0xf1 } }, -}; +/* NIST test vector "abc" */ +DIGEST_TEST ( sha1_nist_abc, &sha1_algorithm, DIGEST_NIST_ABC, + DIGEST ( 0xa9, 0x99, 0x3e, 0x36, 0x47, 0x06, 0x81, 0x6a, 0xba, + 0x3e, 0x25, 0x71, 0x78, 0x50, 0xc2, 0x6c, 0x9c, 0xd0, + 0xd8, 0x9d ) ); -/** SHA-1 test fragment lists */ -static struct digest_test_fragments sha1_test_fragments[] = { - { { 0, -1UL, } }, - { { 1, 1, 1, 1, 1, 1, 1, 1 } }, - { { 2, 0, 23, 4, 6, 1, 0 } }, -}; +/* NIST test vector "abc...opq" */ +DIGEST_TEST ( sha1_nist_abc_opq, &sha1_algorithm, DIGEST_NIST_ABC_OPQ, + DIGEST ( 0x84, 0x98, 0x3e, 0x44, 0x1c, 0x3b, 0xd2, 0x6e, 0xba, + 0xae, 0x4a, 0xa1, 0xf9, 0x51, 0x29, 0xe5, 0xe5, 0x46, + 0x70, 0xf1 ) ); /** * Perform SHA-1 self-test * */ static void sha1_test_exec ( void ) { - struct digest_algorithm *digest = &sha1_algorithm; - struct sha1_test_vector *test; - unsigned long cost; - unsigned int i; - unsigned int j; - /* Correctness test */ - for ( i = 0 ; i < ( sizeof ( sha1_test_vectors ) / - sizeof ( sha1_test_vectors[0] ) ) ; i++ ) { - test = &sha1_test_vectors[i]; - /* Test with a single pass */ - digest_ok ( digest, NULL, test->data, test->len, test->digest ); - /* Test with fragment lists */ - for ( j = 0 ; j < ( sizeof ( sha1_test_fragments ) / - sizeof ( sha1_test_fragments[0] ) ) ; j++ ){ - digest_ok ( digest, &sha1_test_fragments[j], - test->data, test->len, test->digest ); - } - } + /* Correctness tests */ + digest_ok ( &sha1_empty ); + digest_ok ( &sha1_nist_abc ); + digest_ok ( &sha1_nist_abc_opq ); - /* Speed test */ - cost = digest_cost ( digest ); - DBG ( "SHA1 required %ld cycles per byte\n", cost ); + /* Speed tests */ + DBG ( "SHA1 required %ld cycles per byte\n", + digest_cost ( &sha1_algorithm ) ); } /** SHA-1 self-test */ diff --git a/src/tests/sha256_test.c b/src/tests/sha256_test.c index f8ba3a0c..80756466 100644 --- a/src/tests/sha256_test.c +++ b/src/tests/sha256_test.c @@ -27,82 +27,54 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); * * SHA-256 tests * + * NIST test vectors are taken from + * + * http://csrc.nist.gov/groups/ST/toolkit/documents/Examples/SHA256.pdf + * */ -#include +/* Forcibly enable assertions */ +#undef NDEBUG + #include #include #include "digest_test.h" -/** An SHA-256 test vector */ -struct sha256_test_vector { - /** Test data */ - void *data; - /** Test data length */ - size_t len; - /** Expected digest */ - uint8_t digest[SHA256_DIGEST_SIZE]; -}; +/* Empty test vector (digest obtained from "sha256sum /dev/null") */ +DIGEST_TEST ( sha256_empty, &sha256_algorithm, DIGEST_EMPTY, + DIGEST ( 0xe3, 0xb0, 0xc4, 0x42, 0x98, 0xfc, 0x1c, 0x14, 0x9a, + 0xfb, 0xf4, 0xc8, 0x99, 0x6f, 0xb9, 0x24, 0x27, 0xae, + 0x41, 0xe4, 0x64, 0x9b, 0x93, 0x4c, 0xa4, 0x95, 0x99, + 0x1b, 0x78, 0x52, 0xb8, 0x55 ) ); -/** SHA-256 test vectors */ -static struct sha256_test_vector sha256_test_vectors[] = { - /* Empty test data - * - * Expected digest value obtained from "sha256sum /dev/null" - */ - { NULL, 0, - { 0xe3, 0xb0, 0xc4, 0x42, 0x98, 0xfc, 0x1c, 0x14, 0x9a, 0xfb, 0xf4, - 0xc8, 0x99, 0x6f, 0xb9, 0x24, 0x27, 0xae, 0x41, 0xe4, 0x64, 0x9b, - 0x93, 0x4c, 0xa4, 0x95, 0x99, 0x1b, 0x78, 0x52, 0xb8, 0x55 } }, - /* Test data and expected digests taken from the NIST - * Cryptographic Toolkit Algorithm Examples at - * http://csrc.nist.gov/groups/ST/toolkit/documents/Examples/SHA256.pdf - */ - { "abc", 3, - { 0xba, 0x78, 0x16, 0xbf, 0x8f, 0x01, 0xcf, 0xea, 0x41, 0x41, 0x40, - 0xde, 0x5d, 0xae, 0x22, 0x23, 0xb0, 0x03, 0x61, 0xa3, 0x96, 0x17, - 0x7a, 0x9c, 0xb4, 0x10, 0xff, 0x61, 0xf2, 0x00, 0x15, 0xad } }, - { "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq", 56, - { 0x24, 0x8d, 0x6a, 0x61, 0xd2, 0x06, 0x38, 0xb8, 0xe5, 0xc0, 0x26, - 0x93, 0x0c, 0x3e, 0x60, 0x39, 0xa3, 0x3c, 0xe4, 0x59, 0x64, 0xff, - 0x21, 0x67, 0xf6, 0xec, 0xed, 0xd4, 0x19, 0xdb, 0x06, 0xc1 } }, -}; +/* NIST test vector "abc" */ +DIGEST_TEST ( sha256_nist_abc, &sha256_algorithm, DIGEST_NIST_ABC, + DIGEST ( 0xba, 0x78, 0x16, 0xbf, 0x8f, 0x01, 0xcf, 0xea, 0x41, + 0x41, 0x40, 0xde, 0x5d, 0xae, 0x22, 0x23, 0xb0, 0x03, + 0x61, 0xa3, 0x96, 0x17, 0x7a, 0x9c, 0xb4, 0x10, 0xff, + 0x61, 0xf2, 0x00, 0x15, 0xad ) ); -/** SHA-256 test fragment lists */ -static struct digest_test_fragments sha256_test_fragments[] = { - { { 0, -1UL, } }, - { { 1, 1, 1, 1, 1, 1, 1, 1 } }, - { { 2, 0, 23, 4, 6, 1, 0 } }, -}; +/* NIST test vector "abc...opq" */ +DIGEST_TEST ( sha256_nist_abc_opq, &sha256_algorithm, DIGEST_NIST_ABC_OPQ, + DIGEST ( 0x24, 0x8d, 0x6a, 0x61, 0xd2, 0x06, 0x38, 0xb8, 0xe5, + 0xc0, 0x26, 0x93, 0x0c, 0x3e, 0x60, 0x39, 0xa3, 0x3c, + 0xe4, 0x59, 0x64, 0xff, 0x21, 0x67, 0xf6, 0xec, 0xed, + 0xd4, 0x19, 0xdb, 0x06, 0xc1 ) ); /** * Perform SHA-256 self-test * */ static void sha256_test_exec ( void ) { - struct digest_algorithm *digest = &sha256_algorithm; - struct sha256_test_vector *test; - unsigned long cost; - unsigned int i; - unsigned int j; - /* Correctness test */ - for ( i = 0 ; i < ( sizeof ( sha256_test_vectors ) / - sizeof ( sha256_test_vectors[0] ) ) ; i++ ) { - test = &sha256_test_vectors[i]; - /* Test with a single pass */ - digest_ok ( digest, NULL, test->data, test->len, test->digest ); - /* Test with fragment lists */ - for ( j = 0 ; j < ( sizeof ( sha256_test_fragments ) / - sizeof ( sha256_test_fragments[0] )); j++ ){ - digest_ok ( digest, &sha256_test_fragments[j], - test->data, test->len, test->digest ); - } - } + /* Correctness tests */ + digest_ok ( &sha256_empty ); + digest_ok ( &sha256_nist_abc ); + digest_ok ( &sha256_nist_abc_opq ); - /* Speed test */ - cost = digest_cost ( digest ); - DBG ( "SHA256 required %ld cycles per byte\n", cost ); + /* Speed tests */ + DBG ( "SHA256 required %ld cycles per byte\n", + digest_cost ( &sha256_algorithm ) ); } /** SHA-256 self-test */