OpenSSL Generate ECDH Public Key

I am trying to use the OpenSSL command line to generate a ECDH public key that meets the following specifications:

Use a Base64 encoded X.509 SubjectPublicKeyInfo structure containing a ECDH public key for group P256

They following commands provide me with a key:

openssl ecparam -name prime256v1 -out prime256v1.pem openssl ecparam -in prime256v1.pem -genkey -noout -out prime256v1-key.pem openssl ec -in prime256v1-key.pem -pubout -out pubkey.pem  Key: MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAE85KGK3YiX7tC7mFm+Te1xRYOeDq23h80MPPt1nMZ/ZRpwjRGPEUr6vaoOCB8QC3uHmaPKOAgQ0Kk9Sc4M1QUmA== 

However this key is not being accepted by the API I am accessing.

An example key that is working is:

MDkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDIgACKoJz0lSBocGMsdl8TiMasRsBOxpMywCqzAoOLwZfUl0= 

This example key is 44 (Base64) bytes shorter and has a slightly different SubjectPublickKeyInfo signature.

My question is what is the difference between these two keys and how could I use the OpenSSL command line tools to generate such a key pair.

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Category: openssl Time: 2016-07-28 Views: 1

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