Item 67 - execution error

[xyang2013]

I experienced warnings and errors when executing the sample code:

code:

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

issues:

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.

code:

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

issues:

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:

code:

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

issues:

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: