pki --acert

pki --acert [--in file] [--group membership] --issuerkey file|--issuerkeyid hex
             --issuercert file [--lifetime hours] [--not-before datetime]
            [--not-after datetime] [--dateform form] [--serial hex]
            [--digest md5|sha1|sha224|sha256|sha384|sha512|sha3_224|sha3_256|sha3_384|sha3_512]
            [--rsa-padding pkcs1|pss] [--outform der|pem]

pki --acert --help

--in              (-i)  holder certificate to issue an attribute certificate for, default: stdin
--group           (-m)  group membership the AC shall certify (included as string), may be repeated
--issuerkey       (-k)  issuer private key
--issuerkeyid     (-x)  smartcard or TPM issuer private key object handle
--issuercert      (-c)  issuer certificate
--lifetime        (-l)  hours the certificate is valid, default: 24
--not-before      (-F)  absolute time when the validity of the AC begins
--not-after       (-T)  absolute time when the validity of the AC ends
--dateform        (-D)  strptime(3) format for the --not-before and --not-after options, default: %d.%m.%y %T
--serial          (-s)  serial number in hex, default: random
--digest          (-g)  digest to use for signature creation, default: key-specific
--rsa-padding     (-R)  padding for RSA signatures, default: pkcs1
--outform         (-f)  encoding of generated cert, default: der
--debug           (-v)  set debug level, default: 1
--options         (-+)  read command line options from file----
--help            (-h)  show usage information

cat > acert.opt
--issuercert aacert.der --issuerkey aakey.der
--digest sha256 --lifetime 4

pki --acert --options acert.opt --in holder.der --group sales --group finance > ac.der