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diff --git a/lib/openssl/demos/tunala/cb.c b/lib/openssl/demos/tunala/cb.c
new file mode 100644
index 0000000..f6e452a
--- /dev/null
+++ b/lib/openssl/demos/tunala/cb.c
@@ -0,0 +1,162 @@
+#include "tunala.h"
+
+#ifndef NO_OPENSSL
+
+/* For callbacks generating output, here are their file-descriptors. */
+static FILE *fp_cb_ssl_info = NULL;
+static FILE *fp_cb_ssl_verify = NULL;
+/* Output level:
+ *     0 = nothing,
+ *     1 = minimal, just errors,
+ *     2 = minimal, all steps,
+ *     3 = detail, all steps */
+static unsigned int cb_ssl_verify_level = 1;
+
+/* Other static rubbish (to mirror s_cb.c where required) */
+static int int_verify_depth = 10;
+
+/* This function is largely borrowed from the one used in OpenSSL's "s_client"
+ * and "s_server" utilities. */
+void cb_ssl_info(const SSL *s, int where, int ret)
+{
+	const char *str1, *str2;
+	int w;
+
+	if(!fp_cb_ssl_info)
+		return;
+
+	w = where & ~SSL_ST_MASK;
+	str1 = (w & SSL_ST_CONNECT ? "SSL_connect" : (w & SSL_ST_ACCEPT ?
+				"SSL_accept" : "undefined")),
+	str2 = SSL_state_string_long(s);
+
+	if (where & SSL_CB_LOOP)
+		fprintf(fp_cb_ssl_info, "(%s) %s\n", str1, str2);
+	else if (where & SSL_CB_EXIT) {
+		if (ret == 0)
+			fprintf(fp_cb_ssl_info, "(%s) failed in %s\n", str1, str2);
+/* In a non-blocking model, we get a few of these "error"s simply because we're
+ * calling "reads" and "writes" on the state-machine that are virtual NOPs
+ * simply to avoid wasting the time seeing if we *should* call them. Removing
+ * this case makes the "-out_state" output a lot easier on the eye. */
+#if 0
+		else if (ret < 0)
+			fprintf(fp_cb_ssl_info, "%s:error in %s\n", str1, str2);
+#endif
+	}
+}
+
+void cb_ssl_info_set_output(FILE *fp)
+{
+	fp_cb_ssl_info = fp;
+}
+
+static const char *int_reason_no_issuer = "X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT";
+static const char *int_reason_not_yet = "X509_V_ERR_CERT_NOT_YET_VALID";
+static const char *int_reason_before = "X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD";
+static const char *int_reason_expired = "X509_V_ERR_CERT_HAS_EXPIRED";
+static const char *int_reason_after = "X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD";
+
+/* Stolen wholesale from apps/s_cb.c :-) And since then, mutilated ... */
+int cb_ssl_verify(int ok, X509_STORE_CTX *ctx)
+{
+	char buf1[256]; /* Used for the subject name */
+	char buf2[256]; /* Used for the issuer name */
+	const char *reason = NULL; /* Error reason (if any) */
+	X509 *err_cert;
+	int err, depth;
+
+	if(!fp_cb_ssl_verify || (cb_ssl_verify_level == 0))
+		return ok;
+	err_cert = X509_STORE_CTX_get_current_cert(ctx);
+	err = X509_STORE_CTX_get_error(ctx);
+	depth = X509_STORE_CTX_get_error_depth(ctx);
+
+	buf1[0] = buf2[0] = '\0';
+	/* Fill buf1 */
+	X509_NAME_oneline(X509_get_subject_name(err_cert), buf1, 256);
+	/* Fill buf2 */
+	X509_NAME_oneline(X509_get_issuer_name(ctx->current_cert), buf2, 256);
+	switch (ctx->error) {
+	case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
+		reason = int_reason_no_issuer;
+		break;
+	case X509_V_ERR_CERT_NOT_YET_VALID:
+		reason = int_reason_not_yet;
+		break;
+	case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
+		reason = int_reason_before;
+		break;
+	case X509_V_ERR_CERT_HAS_EXPIRED:
+		reason = int_reason_expired;
+		break;
+	case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
+		reason = int_reason_after;
+		break;
+	}
+
+	if((cb_ssl_verify_level == 1) && ok)
+		return ok;
+	fprintf(fp_cb_ssl_verify, "chain-depth=%d, ", depth);
+	if(reason)
+		fprintf(fp_cb_ssl_verify, "error=%s\n", reason);
+	else
+		fprintf(fp_cb_ssl_verify, "error=%d\n", err);
+	if(cb_ssl_verify_level < 3)
+		return ok;
+	fprintf(fp_cb_ssl_verify, "--> subject = %s\n", buf1);
+	fprintf(fp_cb_ssl_verify, "--> issuer  = %s\n", buf2);
+	if(!ok)
+		fprintf(fp_cb_ssl_verify,"--> verify error:num=%d:%s\n",err,
+			X509_verify_cert_error_string(err));
+	fprintf(fp_cb_ssl_verify, "--> verify return:%d\n",ok);
+	return ok;
+}
+
+void cb_ssl_verify_set_output(FILE *fp)
+{
+	fp_cb_ssl_verify = fp;
+}
+
+void cb_ssl_verify_set_depth(unsigned int verify_depth)
+{
+	int_verify_depth = verify_depth;
+}
+
+void cb_ssl_verify_set_level(unsigned int level)
+{
+	if(level < 4)
+		cb_ssl_verify_level = level;
+}
+
+RSA *cb_generate_tmp_rsa(SSL *s, int is_export, int keylength)
+{
+	/* TODO: Perhaps make it so our global key can be generated on-the-fly
+	 * after certain intervals? */
+	static RSA *rsa_tmp = NULL;
+	BIGNUM *bn = NULL;
+	int ok = 1;
+	if(!rsa_tmp) {
+		ok = 0;
+		if(!(bn = BN_new()))
+			goto end;
+		if(!BN_set_word(bn, RSA_F4))
+			goto end;
+		if(!(rsa_tmp = RSA_new()))
+			goto end;
+		if(!RSA_generate_key_ex(rsa_tmp, keylength, bn, NULL))
+			goto end;
+		ok = 1;
+	}
+end:
+	if(bn)
+		BN_free(bn);
+	if(!ok) {
+		RSA_free(rsa_tmp);
+		rsa_tmp = NULL;
+	}
+	return rsa_tmp;
+}
+
+#endif /* !defined(NO_OPENSSL) */
+