signedAttrs as asn1

❯ openssl asn1parse -in signed_content.der -inform DER
    0:d=0  hl=2 l= 105 cons: SET
    2:d=1  hl=2 l=  24 cons: SEQUENCE
    4:d=2  hl=2 l=   9 prim: OBJECT            :contentType
   15:d=2  hl=2 l=  11 cons: SET
   17:d=3  hl=2 l=   9 prim: OBJECT            :pkcs7-data
   28:d=1  hl=2 l=  47 cons: SEQUENCE
   30:d=2  hl=2 l=   9 prim: OBJECT            :messageDigest
   41:d=2  hl=2 l=  34 cons: SET
   43:d=3  hl=2 l=  32 prim: OCTET STRING      [HEX DUMP]:1A2C416E5FC03740BB43C73DA9D141E8630646CE8EC5FCBA620B53259612398F
   77:d=1  hl=2 l=  28 cons: SEQUENCE
   79:d=2  hl=2 l=   9 prim: OBJECT            :signingTime
   90:d=2  hl=2 l=  15 cons: SET
   92:d=3  hl=2 l=  13 prim: UTCTIME           :220611175029Z