[tool-openssl] basic asn1parse support (#2882)

### Issues:
Resolves P342458791

### Description of changes: 
Adds basic support for `openssl asn1parse` with the following arguments:
```
-in <inputFile>
-inform (PEM | DER)
```

The behavior of the command will default to OpenSSL's `-strictpem` flag
behavior which was an optional feature. We can revisit if this
determined to be required in order to relax the input restriction for
valid PEM blocks.

### Call-outs:
The original asn1parse function used `ASN1_dump` rather then
`ASN1_parse`, under the hood they are the same function, except that
`ASN1_dump` can be given a flag to indicate that unknown data should be
hex dumped out. As our BIO hexdump functions doesn't match OpenSSL's the
output would be slightly different. For now I've opted to not support
the `-dump` flag for the CLI, and chose to only expose `ASN1_parse` in
the library. That way we could come back and add `-dump` and `ASN1_dump`
with proper output without worrying about backwards compatibility
concerns.

### Testing:
* Added a series of corpus files for some BER and DER encodings (the
asn1parse tool / library components due allow some BER features e.g.
indefinite length encoding).
* Used DER corpus files to seed a fuzzer for testing the `ASN1_parse`
library function.

By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache 2.0 license and the ISC license.

Author: skmcgrail

crypto/asn1/asn1_par.c

@@ -15,6 +15,7 @@ macro(fuzzer name)
   add_dependencies(all_fuzz_tests ${name})
 endmacro()
 
+fuzzer(asn1parse)
 fuzzer(arm_cpuinfo)
 fuzzer(blowfish)
 fuzzer(bn_div)

fuzz/CMakeLists.txt

@@ -0,0 +1,16 @@
+// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0 OR ISC
+
+#include <openssl/asn1.h>
+#include <openssl/err.h>
+#include <openssl/evp.h>
+#include <openssl/mem.h>
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *buf, size_t len) {
+  bssl::UniquePtr<BIO> bio(BIO_new(BIO_s_mem()));
+  if(len > LONG_MAX) {
+    return 0;
+  }
+  ASN1_parse(bio.get(), buf, len, 0);
+  return 0;
+}

fuzz/asn1parse.cc

@@ -0,0 +1 @@
+�

fuzz/asn1parse_corpus/007dd9b9b6f1fe30c650ee7988643e98436c23da

@@ -0,0 +1,3 @@
+
+
+