for proc in procs:
 out, _ = proc.communicate()
 print(out[-10:])

b'\x9f\x81\xdd\xbe\x99\x0e\x8ck|a'
b'P\x8a\x8d\xc5\xc4\xf4\x0c\xd3\x9e\x03'
b'\xe6\xb8?\xef\xf4\x10\x10\xe4\xd6\xf8'
*** WARNING : deprecated key derivation used.
Using -iter or -pbkdf2 would be better.
*** WARNING : deprecated key derivation used.
Using -iter or -pbkdf2 would be better.

encrypt_procs = []
hash_procs = []
for _ in range(3):
 data = os.urandom(100)
 encrypt_proc = run_encrypt(data)
 encrypt_procs.append(encrypt_proc)
 hash_proc = run_hash(encrypt_proc.stdout)
 hash_procs.append(hash_proc)
 # Ensure that the child consumes the input stream and 
 # the communicate() method doesn't inadvertently steal
 # input from the child. Also lets SIGPIPE propagate to 
 # upstream process if the downstream process dies.
 encrypt_proc.stdout.close()
 encrypt_proc.stdout = None

Error setting digest
40C7F45E9C770000:error:0308010C:digital envelope routines:inner_evp_generic_fetch:unsupported:crypto/evp/evp_fetch.c:386:Global default library context, Algorithm (whirlpool : 99), Properties ()
40C7F45E9C770000:error:03000086:digital envelope routines:evp_md_init_internal:initialization error:crypto/evp/digest.c:254:
*** WARNING : deprecated key derivation used.
Using -iter or -pbkdf2 would be better.
Error setting digest
40172D4FD8790000:error:0308010C:digital envelope routines:inner_evp_generic_fetch:unsupported:crypto/evp/evp_fetch.c:386:Global default library context, Algorithm (whirlpool : 99), Properties ()
40172D4FD8790000:error:03000086:digital envelope routines:evp_md_init_internal:initialization error:crypto/evp/digest.c:254:
*** WARNING : deprecated key derivation used.
Using -iter or -pbkdf2 would be better.
*** WARNING : deprecated key derivation used.
Using -iter or -pbkdf2 would be better.
Error setting digest
406722E210710000:error:0308010C:digital envelope routines:inner_evp_generic_fetch:unsupported:crypto/evp/evp_fetch.c:386:Global default library context, Algorithm (whirlpool : 99), Properties ()
406722E210710000:error:03000086:digital envelope routines:evp_md_init_internal:initialization error:crypto/evp/digest.c:254:

for proc in encrypt_procs:
 proc.communicate()
 assert proc.returncode == 0
for proc in hash_procs:
 out, _ = proc.communicate()
 print(out[-10:])
 assert proc.returncode == 0

bad encrypt
4067717390700000:error:80000020:system library:file_ctrl:Broken pipe:crypto/bio/bss_file.c:326:calling fflush()
4067717390700000:error:10080002:BIO routines:file_ctrl:system lib:crypto/bio/bss_file.c:328:
---------------------------------------------------------------------------
AssertionError Traceback (most recent call last)
Cell In[12], line 3
 1 for proc in encrypt_procs:
 2 proc.communicate()
----> 3 assert proc.returncode == 0
 5 for proc in hash_procs:
 6 out, _ = proc.communicate()
AssertionError: