[dm-crypt] Unattended generation/opening.

Could someone let me know what I'm doing wrong here?  I'm trying to do this in a script, but it doesn't work on the command line, either:

$ echo "lukssecpwd" | sudo cryptsetup -c twofish-xts-plain64 -s 512 luksFormat /dev/loop5 -
$ echo "lukssecpwd" | sudo cryptsetup open /dev/loop5 crypt.secret
No key available with this passphrase.

$ sudo cryptsetup luksDump /dev/loop5
LUKS header information for /dev/loop5

Version:       	1
Cipher name:   	twofish
Cipher mode:   	xts-plain64
Hash spec:     	sha256
Payload offset:	4096
MK bits:       	512
MK digest:     	ed e5 83 79 0a ba 5f 85 96 4b 37 c9 50 d6 4b 52 0a ad c3 ca 
MK salt:       	b7 53 d7 74 e8 26 e0 0c 94 39 62 8d 52 cd f1 0f 
               	e5 6b ae 04 e0 5a 3c 92 c7 1e fe c6 69 d5 3c 78 
MK iterations: 	60569
UUID:          	95b47c48-9b76-4403-b5c8-6c54298cb0c5

Key Slot 0: ENABLED
	Iterations:         	969108
	Salt:               	fb 4a a5 43 b3 e0 a8 5d 86 e9 c5 50 c0 42 7a b0 
	                      	3a 56 31 ac 1b 98 46 cb 93 2f 9f 3c 68 e8 3a 32 
	Key material offset:	8
	AF stripes:            	4000
Key Slot 1: DISABLED
Key Slot 2: DISABLED
Key Slot 3: DISABLED
Key Slot 4: DISABLED
Key Slot 5: DISABLED
Key Slot 6: DISABLED
Key Slot 7: DISABLED


Ubuntu 18.04
cryptsetup 2.0.2

/D