EVP_DigestVerifyFinal with ECDSA signature

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EVP_DigestVerifyFinal with ECDSA signature

Ken Goldman-2
I'm trying to use the EVP interface for signature verification.

However, EVP_DigestVerifyFinal() takes a signature and length as
parameters.  While I understand this for RSA, ECDSA signatures have R
and S elements.

Is there a convertor function?

If I must convert by hand, how is it done?  In certificates, I see a
0x04 followed by R and S arrays.

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