How to adding a new cipher algoritm (source code) to OpenSSL

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Hi~

I want to add a new cipher algorithm "SEED" to OpenSSL.
So, I want to use new cipher suites such as SSL_CS_RSA_SEED_CBC_MD5, 
SSL_CS_RSA_SEED_CBC_SHA.
In OpenSSL, Which parts must be changed?? Or How can I attach the SEED to OpenSSL??

thanks~