[ASN1] How to define SIGNED{ToBeSigned} ::= ..& other H.235 structures

[nav b]

sorry i had to resend cos few of them had problem with my domain

In the ITU-T Recommendation H.235 I found the ASN.1 expression

SIGNED { ToBeSigned } ::= SEQUENCE {
          toBeSigned ToBeSigned,
          algorithmOID OBJECT IDENTIFIER,
          paramS Params, -- any "runtime" parameters
          signature BIT STRING -- could be an RSA or an ASN.1

                  coded ECGDSASignature
} ( CONSTRAINED BY { -- Verify or Sign Certificate -- } )

this is my understanding of above structure
N::= SIGNED { XYZ }

is equalent of

N::=SEQUENCE
{
         toBeSigned XYZ,
         algorithmOID OBJECT IDENTIFIER,
          paramS Params, -- any "runtime" parameters
          signature BIT STRING -- could be an RSA or an ASN.1

                  coded ECGDSASignature
} ( CONSTRAINED BY { -- Verify or Sign Certificate -- } )

is my understanding right?

& does the CONSTRAINED BY which is a user-defined constraint,  can it
be ignored here?

ENCRYPTED { ToBeEncrypted } ::= SEQUENCE {
          algorithmOID OBJECT IDENTIFIER,
          paramS Params, -- any "runtime" parameters
          encryptedData OCTET STRING
} ( CONSTRAINED BY { -- Encrypt or Decrypt -- ToBeEncrypted } )

HASHED { ToBeHashed } ::= SEQUENCE {
          algorithmOID OBJECT IDENTIFIER,
          paramS Params, -- any "runtime" parameters
          hash BIT STRING
} ( CONSTRAINED BY { -- Hash -- ToBeHashed } )

the ENCRYPTED & HASHED structures, also have same issues as SIGNED

Thanks a lot

Naveen Kumar B K
Encore Software Limited
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