EVP MD

Easy, nothing more to say.

Sample code:

const EVP_MD *md = EVP_sha1();     EVP_MD_CTX ctx;     unsigned char md_buf[EVP_MAX_MD_SIZE];     unsigned int mdLen = 0;       EVP_MD_CTX_init(&ctx);       if (!EVP_DigestInit_ex(&ctx,md, NULL))        return 0;     EVP_DigestUpdate(&ctx,data,datal);     EVP_DigestFinal_ex(&ctx,&(md_buf[0]),&mds);       EVP_MD_CTX_cleanup(&ctx);