HMAC_MD5_KEY
hmac_md5_preparekey(HMAC_MD5_KEY(tfm), raw_key, keylen);
hmac_md5_init(HMAC_MD5_CTX(desc), HMAC_MD5_KEY(desc->tfm));
hmac_md5(HMAC_MD5_KEY(desc->tfm), data, len, out);
ctx->ostate = HMAC_MD5_KEY(desc->tfm)->ostate;
ctx->ostate = HMAC_MD5_KEY(desc->tfm)->ostate;