Adding subjectAltName:OtherName in cert request

Hi,

I need to add the following in the certificate request.


id-ce-subjectAltName OBJECT IDENTIFIER ::= { id-ce 17 }
subjectAltName = GeneralNames
otherName [0] OtherName
OtherName ::= Sequence {

Id-on-hardwareModuleName OBJECT IDENTIFIER ::= iso(1)
identified-organization(3) dod(6)

internet(1) security(5) mechanisms(5) pkix(7) on(8) 4

HardwareModuleName ::= SEQUENCE {

hwType OBJECT IDENTIFIER

hwSerialNum OCTET STRING

}

}


I able to generate the certificate required using openSSl cmd line with
conf  where following was added in config file

[ v3_req ]
# Extensions to add to a certificate request
basicConstraints = CA:FALSE
keyUsage = nonRepudiation, digitalSignature, keyEncipherment
*subjectAltName=otherName:1.3.6.1.5.5.7.8.4;SEQ:hmodname*
*[hmodname]*
*hwType = OID:1.3.6.1.4.1.47196.6.3.2.2*
*hwSerialNum = FORMAT:HEX,OCT:01020304 *



I need to do add subject alt name in certificate request using openSSL
API.( not using config file)

I have tried to use GENERAL_NAME_set0_othername , but I am not able to add
an inner sequence.

Can someone suggest how we can add  this using OpenSSL APIs

Regards
Manish