How to run OpenSSL command line utility under debugger?

[Anton Schmidt]

I've got an error in openssl library function when trying to read a pkcs7
message

[schmidt at localhost ssl]$ ./bin/openssl version
OpenSSL 3.0.0-dev xx XXX xxxx (Library: OpenSSL 3.0.0-dev xx XXX xxxx)
[schmidt at localhost ssl]$ ./bin/openssl pkcs7 -in
/tmp/55b0822e148e4ffaa0bd9ebc41814f54.der -inform DER -print_certs
unable to load PKCS7 object
40:57:70:89:A5:7F:00:00:error:asn1 encoding routines:(unknown
function):sequence length
mismatch:crypto/asn1/tasn_dec.c:388:Type=PKCS7_ENVELOPE
40:57:70:89:A5:7F:00:00:error:asn1 encoding routines:(unknown
function):nested asn1 error:crypto/asn1/tasn_dec.c:629:
40:57:70:89:A5:7F:00:00:error:asn1 encoding routines:(unknown
function):nested asn1 error:crypto/asn1/tasn_dec.c:479:Field=d.enveloped,
Type=PKCS7

openssl asn1parse and other online tools correctly parse and display ASN1
of pkcs7 envelopedData.

I want to run openssl utility under debugger to see what is happening
inside the library function.

I've found OpenSSL library source code https://github.com/openssl/openssl but
not the sources for command line utility. Are the sources available?

Or as an option is there a guide how I could write a simple pkcs7
envelopedData reader to debug the library function?
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