TEST: Add testutil tests to compare unterminated strings of different lengths

We use this in test/serdes_test.c, to compare serializations into PEM,
which aren't necessarily terminated with a NUL byte when they were
written to a BIO_s_mem().

Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/12544)

3 files changed, 45 insertions, 16 deletions

diff --git a/test/serdes_test.c b/test/serdes_test.c
index 298d22e8b9..85165523ca 100644
--- a/test/serdes_test.c
+++ b/test/serdes_test.c
@@ -90,6 +90,8 @@ typedef int (serializer)(void **serialized, long *serialized_len,
 typedef int (deserializer)(void **object,
                            void *serialized, long serialized_len,
                            const char *pass);
+typedef int (tester)(const void *data1, size_t data1_len,
+                     const void *data2, size_t data2_len);
 typedef int (checker)(const char *type, const void *data, size_t data_len);
 typedef void (dumper)(const char *label, const void *data, size_t data_len);
 
@@ -97,6 +99,7 @@ static int test_serialize_deserialize(const char *type, EVP_PKEY *pkey,
                                       const char *pass, const char *pcipher,
                                       serializer *serialize_cb,
                                       deserializer *deserialize_cb,
+                                      tester *test_cb,
                                       checker *check_cb, dumper *dump_cb,
                                       const char *ser_propq, int make_legacy)
 {
@@ -131,14 +134,18 @@ static int test_serialize_deserialize(const char *type, EVP_PKEY *pkey,
     if ((pass == NULL && pcipher == NULL)
         && (!serialize_cb(&serialized2, &serialized2_len, pkey2,
                           pass, pcipher, ser_propq)
-            || !TEST_mem_eq(serialized, serialized_len,
-                            serialized2, serialized2_len)))
+            || !test_cb(serialized, serialized_len,
+                        serialized2, serialized2_len)))
         goto end;
 
     ok = 1;
  end:
-    if (!ok)
-        dump_cb("serialized result", serialized, serialized_len);
+    if (!ok) {
+        if (serialized != NULL && serialized_len != 0)
+            dump_cb("serialized result", serialized, serialized_len);
+        if (serialized2 != NULL && serialized2_len != 0)
+            dump_cb("re-serialized result", serialized2, serialized2_len);
+    }
 
     OPENSSL_free(serialized);
     OPENSSL_free(serialized2);
@@ -248,6 +255,18 @@ static int serialize_EVP_PKEY_legacy_PEM(void **serialized,
     return ok;
 }
 
+static int test_text(const void *data1, size_t data1_len,
+                     const void *data2, size_t data2_len)
+{
+    return TEST_strn2_eq(data1, data1_len, data2, data2_len);
+}
+
+static int test_mem(const void *data1, size_t data1_len,
+                    const void *data2, size_t data2_len)
+{
+    return TEST_mem_eq(data1, data1_len, data2, data2_len);
+}
+
 /* Test cases and their dumpers / checkers */
 
 static void dump_der(const char *label, const void *data, size_t data_len)
@@ -283,6 +302,7 @@ static int test_unprotected_via_DER(const char *type, EVP_PKEY *key)
     return test_serialize_deserialize(type, key, NULL, NULL,
                                       serialize_EVP_PKEY_prov,
                                       deserialize_EVP_PKEY_prov,
+                                      test_mem,
                                       check_unprotected_PKCS8_DER, dump_der,
                                       OSSL_SERIALIZER_PrivateKey_TO_DER_PQ,
                                       0);
@@ -301,6 +321,7 @@ static int test_unprotected_via_PEM(const char *type, EVP_PKEY *key)
     return test_serialize_deserialize(type, key, NULL, NULL,
                                       serialize_EVP_PKEY_prov,
                                       deserialize_EVP_PKEY_prov,
+                                      test_text,
                                       check_unprotected_PKCS8_PEM, dump_pem,
                                       OSSL_SERIALIZER_PrivateKey_TO_PEM_PQ,
                                       0);
@@ -322,6 +343,7 @@ static int test_unprotected_via_legacy_PEM(const char *type, EVP_PKEY *key)
     return test_serialize_deserialize(type, key, NULL, NULL,
                                       serialize_EVP_PKEY_legacy_PEM,
                                       deserialize_EVP_PKEY_prov,
+                                      test_text,
                                       check_unprotected_legacy_PEM, dump_pem,
                                       NULL, 1);
 }
@@ -345,6 +367,7 @@ static int test_protected_via_DER(const char *type, EVP_PKEY *key)
     return test_serialize_deserialize(type, key, pass, pass_cipher,
                                       serialize_EVP_PKEY_prov,
                                       deserialize_EVP_PKEY_prov,
+                                      test_mem,
                                       check_protected_PKCS8_DER, dump_der,
                                       OSSL_SERIALIZER_PrivateKey_TO_DER_PQ,
                                       0);
@@ -363,6 +386,7 @@ static int test_protected_via_PEM(const char *type, EVP_PKEY *key)
     return test_serialize_deserialize(type, key, pass, pass_cipher,
                                       serialize_EVP_PKEY_prov,
                                       deserialize_EVP_PKEY_prov,
+                                      test_text,
                                       check_protected_PKCS8_PEM, dump_pem,
                                       OSSL_SERIALIZER_PrivateKey_TO_PEM_PQ,
                                       0);
@@ -385,6 +409,7 @@ static int test_protected_via_legacy_PEM(const char *type, EVP_PKEY *key)
     return test_serialize_deserialize(type, key, pass, pass_cipher,
                                       serialize_EVP_PKEY_legacy_PEM,
                                       deserialize_EVP_PKEY_prov,
+                                      test_text,
                                       check_protected_legacy_PEM, dump_pem,
                                       NULL, 1);
 }
@@ -404,6 +429,7 @@ static int test_public_via_DER(const char *type, EVP_PKEY *key)
     return test_serialize_deserialize(type, key, NULL, NULL,
                                       serialize_EVP_PKEY_prov,
                                       deserialize_EVP_PKEY_prov,
+                                      test_mem,
                                       check_public_DER, dump_der,
                                       OSSL_SERIALIZER_PUBKEY_TO_DER_PQ,
                                       0);
@@ -422,6 +448,7 @@ static int test_public_via_PEM(const char *type, EVP_PKEY *key)
     return test_serialize_deserialize(type, key, NULL, NULL,
                                       serialize_EVP_PKEY_prov,
                                       deserialize_EVP_PKEY_prov,
+                                      test_text,
                                       check_public_PEM, dump_pem,
                                       OSSL_SERIALIZER_PUBKEY_TO_PEM_PQ,
                                       0);
diff --git a/test/testutil.h b/test/testutil.h
index 69869e2601..88a3cbc9a8 100644
--- a/test/testutil.h
+++ b/test/testutil.h
@@ -296,9 +296,9 @@ DECLARE_COMPARISON(char *, str, ne)
  * Same as above, but for strncmp.
  */
 int test_strn_eq(const char *file, int line, const char *, const char *,
-                 const char *a, const char *b, size_t s);
+                 const char *a, size_t an, const char *b, size_t bn);
 int test_strn_ne(const char *file, int line, const char *, const char *,
-                 const char *a, const char *b, size_t s);
+                 const char *a, size_t an, const char *b, size_t bn);
 
 /*
  * Equality test for memory blocks where NULL is a legitimate value.
@@ -438,8 +438,10 @@ void test_perror(const char *s);
 
 # define TEST_str_eq(a, b)    test_str_eq(__FILE__, __LINE__, #a, #b, a, b)
 # define TEST_str_ne(a, b)    test_str_ne(__FILE__, __LINE__, #a, #b, a, b)
-# define TEST_strn_eq(a, b, n) test_strn_eq(__FILE__, __LINE__, #a, #b, a, b, n)
-# define TEST_strn_ne(a, b, n) test_strn_ne(__FILE__, __LINE__, #a, #b, a, b, n)
+# define TEST_strn_eq(a, b, n) test_strn_eq(__FILE__, __LINE__, #a, #b, a, n, b, n)
+# define TEST_strn_ne(a, b, n) test_strn_ne(__FILE__, __LINE__, #a, #b, a, n, b, n)
+# define TEST_strn2_eq(a, m, b, n) test_strn_eq(__FILE__, __LINE__, #a, #b, a, m, b, n)
+# define TEST_strn2_ne(a, m, b, n) test_strn_ne(__FILE__, __LINE__, #a, #b, a, m, b, n)
 
 # define TEST_mem_eq(a, m, b, n) test_mem_eq(__FILE__, __LINE__, #a, #b, a, m, b, n)
 # define TEST_mem_ne(a, m, b, n) test_mem_ne(__FILE__, __LINE__, #a, #b, a, m, b, n)
diff --git a/test/testutil/tests.c b/test/testutil/tests.c
index 56177cd999..c1605ca8eb 100644
--- a/test/testutil/tests.c
+++ b/test/testutil/tests.c
@@ -302,28 +302,28 @@ int test_str_ne(const char *file, int line, const char *st1, const char *st2,
 }
 
 int test_strn_eq(const char *file, int line, const char *st1, const char *st2,
-                 const char *s1, const char *s2, size_t len)
+                 const char *s1, size_t n1, const char *s2, size_t n2)
 {
     if (s1 == NULL && s2 == NULL)
       return 1;
-    if (s1 == NULL || s2 == NULL || strncmp(s1, s2, len) != 0) {
+    if (n1 != n2 || s1 == NULL || s2 == NULL || strncmp(s1, s2, n1) != 0) {
         test_fail_string_message(NULL, file, line, "string", st1, st2, "==",
-                                 s1, s1 == NULL ? 0 : OPENSSL_strnlen(s1, len),
-                                 s2, s2 == NULL ? 0 : OPENSSL_strnlen(s2, len));
+                                 s1, s1 == NULL ? 0 : OPENSSL_strnlen(s1, n1),
+                                 s2, s2 == NULL ? 0 : OPENSSL_strnlen(s2, n2));
         return 0;
     }
     return 1;
 }
 
 int test_strn_ne(const char *file, int line, const char *st1, const char *st2,
-                 const char *s1, const char *s2, size_t len)
+                 const char *s1, size_t n1, const char *s2, size_t n2)
 {
     if ((s1 == NULL) ^ (s2 == NULL))
       return 1;
-    if (s1 == NULL || strncmp(s1, s2, len) == 0) {
+    if (n1 != n2 || s1 == NULL || strncmp(s1, s2, n1) == 0) {
         test_fail_string_message(NULL, file, line, "string", st1, st2, "!=",
-                                 s1, s1 == NULL ? 0 : OPENSSL_strnlen(s1, len),
-                                 s2, s2 == NULL ? 0 : OPENSSL_strnlen(s2, len));
+                                 s1, s1 == NULL ? 0 : OPENSSL_strnlen(s1, n1),
+                                 s2, s2 == NULL ? 0 : OPENSSL_strnlen(s2, n2));
         return 0;
     }
     return 1;