Move ossl_asn1_string_to_time_t() to libtestutil

It is not used anywhere else than in tests.

Fixes #22965

Reviewed-by: Hugo Landau <hlandau@openssl.org>
Reviewed-by: Tom Cosgrove <tom.cosgrove@arm.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/23269)

7 files changed, 95 insertions, 81 deletions

diff --git a/crypto/asn1/a_time.c b/crypto/asn1/a_time.c
index 96ee63d310..7dfbc5faab 100644
--- a/crypto/asn1/a_time.c
+++ b/crypto/asn1/a_time.c
@@ -591,78 +591,3 @@ int ASN1_TIME_compare(const ASN1_TIME *a, const ASN1_TIME *b)
         return -1;
     return 0;
 }
-
-/*
- * tweak for Windows
- */
-#ifdef WIN32
-# define timezone _timezone
-#endif
-
-#if defined(__FreeBSD__) || defined(__wasi__)
-# define USE_TIMEGM
-#endif
-
-time_t ossl_asn1_string_to_time_t(const char *asn1_string)
-{
-    ASN1_TIME *timestamp_asn1 = NULL;
-    struct tm *timestamp_tm = NULL;
-#if defined(__DJGPP__)
-    char *tz = NULL;
-#elif !defined(USE_TIMEGM)
-    time_t timestamp_local;
-#endif
-    time_t timestamp_utc;
-
-    timestamp_asn1 = ASN1_TIME_new();
-    if (!ASN1_TIME_set_string(timestamp_asn1, asn1_string))
-    {
-        ASN1_TIME_free(timestamp_asn1);
-        return -1;
-    }
-
-    timestamp_tm = OPENSSL_malloc(sizeof(*timestamp_tm));
-    if (timestamp_tm == NULL) {
-        ASN1_TIME_free(timestamp_asn1);
-        return -1;
-    }
-    if (!(ASN1_TIME_to_tm(timestamp_asn1, timestamp_tm))) {
-        OPENSSL_free(timestamp_tm);
-        ASN1_TIME_free(timestamp_asn1);
-        return -1;
-    }
-    ASN1_TIME_free(timestamp_asn1);
-
-#if defined(__DJGPP__)
-    /*
-     * This is NOT thread-safe.  Do not use this method for platforms other
-     * than djgpp.
-     */
-    tz = getenv("TZ");
-    if (tz != NULL) {
-        tz = OPENSSL_strdup(tz);
-        if (tz == NULL) {
-            OPENSSL_free(timestamp_tm);
-            return -1;
-        }
-    }
-    setenv("TZ", "UTC", 1);
-
-    timestamp_utc = mktime(timestamp_tm);
-
-    if (tz != NULL) {
-        setenv("TZ", tz, 1);
-        OPENSSL_free(tz);
-    } else {
-        unsetenv("TZ");
-    }
-#elif defined(USE_TIMEGM)
-    timestamp_utc = timegm(timestamp_tm);
-#else
-    timestamp_local = mktime(timestamp_tm);
-    timestamp_utc = timestamp_local - timezone;
-#endif
-    OPENSSL_free(timestamp_tm);
-
-    return timestamp_utc;
-}
diff --git a/include/crypto/asn1.h b/include/crypto/asn1.h
index 36af1d7689..b5683f007c 100644
--- a/include/crypto/asn1.h
+++ b/include/crypto/asn1.h
@@ -147,7 +147,6 @@ EVP_PKEY *ossl_d2i_PrivateKey_legacy(int keytype, EVP_PKEY **a,
                                      OSSL_LIB_CTX *libctx, const char *propq);
 X509_ALGOR *ossl_X509_ALGOR_from_nid(int nid, int ptype, void *pval);
 
-time_t ossl_asn1_string_to_time_t(const char *asn1_string);
 void ossl_asn1_string_set_bits_left(ASN1_STRING *str, unsigned int num);
 
 #endif /* ndef OSSL_CRYPTO_ASN1_H */
diff --git a/test/asn1_time_test.c b/test/asn1_time_test.c
index 7736fd3416..32bc4ff2ad 100644
--- a/test/asn1_time_test.c
+++ b/test/asn1_time_test.c
@@ -434,10 +434,10 @@ static int convert_asn1_to_time_t(int idx)
 {
     time_t testdateutc;
 
-    testdateutc = ossl_asn1_string_to_time_t(asn1_to_utc[idx].input);
+    testdateutc = test_asn1_string_to_time_t(asn1_to_utc[idx].input);
 
     if (!TEST_time_t_eq(testdateutc, asn1_to_utc[idx].expected)) {
-        TEST_info("ossl_asn1_string_to_time_t (%s) failed: expected %lli, got %lli\n",
+        TEST_info("test_asn1_string_to_time_t (%s) failed: expected %lli, got %lli\n",
                   asn1_to_utc[idx].input,
                   (long long int)asn1_to_utc[idx].expected,
                   (long long int)testdateutc);
diff --git a/test/build.info b/test/build.info
index 9cbca834c8..e2b09ae965 100644
--- a/test/build.info
+++ b/test/build.info
@@ -26,7 +26,7 @@ IF[{- !$disabled{tests} -}]
           testutil/format_output.c testutil/load.c testutil/fake_random.c \
           testutil/test_cleanup.c testutil/main.c testutil/testutil_init.c \
           testutil/options.c testutil/test_options.c testutil/provider.c \
-          testutil/apps_shims.c testutil/random.c $LIBAPPSSRC
+          testutil/apps_shims.c testutil/random.c testutil/helper.c $LIBAPPSSRC
   INCLUDE[libtestutil.a]=../include ../apps/include ..
   DEPEND[libtestutil.a]=../libcrypto
 
diff --git a/test/ca_internals_test.c b/test/ca_internals_test.c
index 24f7ba3884..776996b4ac 100644
--- a/test/ca_internals_test.c
+++ b/test/ca_internals_test.c
@@ -47,7 +47,7 @@ static int test_do_updatedb(void)
     }
 
     testdate = test_get_argument(2);
-    testdateutc = ossl_asn1_string_to_time_t(testdate);
+    testdateutc = test_asn1_string_to_time_t(testdate);
     if (TEST_time_t_lt(testdateutc, 0)) {
         return 0;
     }
diff --git a/test/testutil.h b/test/testutil.h
index a247f55ed6..35fbdab84e 100644
--- a/test/testutil.h
+++ b/test/testutil.h
@@ -648,5 +648,5 @@ X509 *load_cert_pem(const char *file, OSSL_LIB_CTX *libctx);
 X509 *load_cert_der(const unsigned char *bytes, int len);
 STACK_OF(X509) *load_certs_pem(const char *file);
 X509_REQ *load_csr_der(const char *file, OSSL_LIB_CTX *libctx);
-
+time_t test_asn1_string_to_time_t(const char *asn1_string);
 #endif                          /* OSSL_TESTUTIL_H */
diff --git a/test/testutil/helper.c b/test/testutil/helper.c
new file mode 100644
index 0000000000..8da42b0fac
--- /dev/null
+++ b/test/testutil/helper.c
@@ -0,0 +1,90 @@
+/*
+ * Copyright 2020-2021 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the Apache License 2.0 (the "License").  You may not use
+ * this file except in compliance with the License.  You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+#include <stdio.h>
+#include <time.h>
+#include <openssl/asn1t.h>
+#include "../testutil.h"
+
+/*
+ * tweak for Windows
+ */
+#ifdef WIN32
+# define timezone _timezone
+#endif
+
+#if defined(__FreeBSD__) || defined(__wasi__)
+# define USE_TIMEGM
+#endif
+
+time_t test_asn1_string_to_time_t(const char *asn1_string)
+{
+    ASN1_TIME *timestamp_asn1 = NULL;
+    struct tm *timestamp_tm = NULL;
+#if defined(__DJGPP__)
+    char *tz = NULL;
+#elif !defined(USE_TIMEGM)
+    time_t timestamp_local;
+#endif
+    time_t timestamp_utc;
+
+    timestamp_asn1 = ASN1_TIME_new();
+    if(timestamp_asn1 == NULL)
+        return -1;
+    if (!ASN1_TIME_set_string(timestamp_asn1, asn1_string))
+    {
+        ASN1_TIME_free(timestamp_asn1);
+        return -1;
+    }
+
+    timestamp_tm = OPENSSL_malloc(sizeof(*timestamp_tm));
+    if (timestamp_tm == NULL) {
+        ASN1_TIME_free(timestamp_asn1);
+        return -1;
+    }
+    if (!(ASN1_TIME_to_tm(timestamp_asn1, timestamp_tm))) {
+        OPENSSL_free(timestamp_tm);
+        ASN1_TIME_free(timestamp_asn1);
+        return -1;
+    }
+    ASN1_TIME_free(timestamp_asn1);
+
+#if defined(__DJGPP__)
+    /*
+     * This is NOT thread-safe.  Do not use this method for platforms other
+     * than djgpp.
+     */
+    tz = getenv("TZ");
+    if (tz != NULL) {
+        tz = OPENSSL_strdup(tz);
+        if (tz == NULL) {
+            OPENSSL_free(timestamp_tm);
+            return -1;
+        }
+    }
+    setenv("TZ", "UTC", 1);
+
+    timestamp_utc = mktime(timestamp_tm);
+
+    if (tz != NULL) {
+        setenv("TZ", tz, 1);
+        OPENSSL_free(tz);
+    } else {
+        unsetenv("TZ");
+    }
+#elif defined(USE_TIMEGM)
+    timestamp_utc = timegm(timestamp_tm);
+#else
+    timestamp_local = mktime(timestamp_tm);
+    timestamp_utc = timestamp_local - timezone;
+#endif
+    OPENSSL_free(timestamp_tm);
+
+    return timestamp_utc;
+}