[openssl-users] How to encode R and S of an ECDSA signature to ASN1 sequence

[William Roberts]

I can successfully deconstruct an an ECDSA Signature Sequence, but now I
need
to construct it, and I am getting lost.

The format I need to build is:
sECDSA-Sig-Value ::= SEQUENCE { r INTEGER, s INTEGER }

I have r and s as buffers in the same format as returned from:
d2i_ASN1_INTEGER() if one used it to remove r or s from the sequence above.

I am not sure how to compose the sequence given r and s, and if their is a
routine to
essentially do the opposite of d2i_ASN1_INTEGER.

Thanks,
Bill
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