Container-Optimized OS mã hóa mật khẩu bằng thuật toán gì?

# cat /etc/os-release
NAME="Container-Optimized OS"
ID=cos
PRETTY_NAME="Container-Optimized OS from Google"
HOME_URL="https://cloud.google.com/container-optimized-os/docs"
BUG_REPORT_URL="https://cloud.google.com/container-optimized-os/docs/resources/support-policy#contact_us"
GOOGLE_CRASH_ID=Lakitu
GOOGLE_METRICS_PRODUCT_ID=26
KERNEL_COMMIT_ID=2e89dc9fc1cfcb0184104491d7f412eee640086b
VERSION=109
VERSION_ID=109
BUILD_ID=17800.519.18

# cat /etc/shadow
root:*:::::::
thaygiaoth:*:20246:0:99999:7:::

# passwd 

You can now choose the new password or passphrase.

A valid password should be a mix of upper and lower case letters, digits, and
other characters.  You can use a password containing at least 7 characters
from all of these classes, or a password containing at least 8 characters
from just 3 of these 4 classes.
An upper case letter that begins the password and a digit that ends it do not
count towards the number of character classes used.

A passphrase should be of at least 3 words, 11 to 72 characters long, and
contain enough different characters.

Alternatively, if no one else can see your terminal now, you can pick this as
your password: "bone8quake8Eye".

Enter new password: 
Re-type new password: 
passwd: password updated successfully

# cat /etc/shadow
root:$1$Wpl4E7Ex$olg5v8jna7hfoC3QU3Gel1:20246::::::
thaygiaoth:*:20246:0:99999:7:::