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Comment:DH Changes for OpenSSL 3.0 Source: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=275160 and https://cgit.freebsd.org/ports/tree/devel/tcltls/files/dh_params.h?id=2ed62c75d1230bbe8268a1a3c54de2972d50dcf8
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SHA3-256: 54c35183c2d1427db6ac3b43b694300aa0d45fb572cf2d911d35e6011b4ae7cc
User & Date: bohagan on 2023-12-28 21:27:38
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Context
2023-12-28
23:15
Refactored DH generation to not need a separate file for DH data. Added missing header files to generated file. check-in: d3319fd18b user: bohagan tags: dh
21:27
DH Changes for OpenSSL 3.0 Source: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=275160 and https://cgit.freebsd.org/ports/tree/devel/tcltls/files/dh_params.h?id=2ed62c75d1230bbe8268a1a3c54de2972d50dcf8 check-in: 54c35183c2 user: bohagan tags: dh
20:01
Created DH branch check-in: 22f9df2429 user: bohagan tags: dh
Changes
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Modified generic/gen_dh_params from [90177a1658] to [e07a009868].

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			;;
		bits=*)
			bits="`echo "${arg}" | cut -f 2 -d =`"
			;;
	esac
done

openssl_dhparam() {
openssl_dhparam1() {
	if openssl dhparam -C "$@" | sed	\
	    -e 's/^\(static \)*DH \*get_dh[0-9]*/static DH *get_dhParams/'	\
	    -e '/^-----BEGIN DH PARAMETERS-----$/,/^-----END DH PARAMETERS-----$/ d;/^#/ d'
	then
		return 0
	fi

	return 1
}

# OpenSSL 3.0 openssl-dhparam has no "-C" option, so we emulate it here
openssl_dhparam3() {
	if openssl dhparam -text 2048 | \
	    sed -E -e '/^---/,/^---/d' \
		-e '/(DH|prime|generator)/d' \
		-e 's/([0-9a-h]{2})(:|$$)/0x\1, /g' \
		-e generateddh.txt
	then
	else
		return 0
	fi


	cat << \_EOF_
/*
 * OpenSSL no longer offers the "-C" option for its dhparam
 * subcommand, so we keep our own C-code here...
 */

static DH * get_dhParams(void) {
	static unsigned char dhp_2048[] = {
#include "generateddh.txt"
	};
	static unsigned char dhg_2048[] = {
		0x02
	};
	DH	       *dh = DH_new();
	BIGNUM	       *p, *g;

	if (dh == NULL)
		return NULL;
	p = BN_bin2bn(dhp_2048, sizeof(dhp_2048), NULL);
	g = BN_bin2bn(dhg_2048, sizeof(dhg_2048), NULL);
	if (p == NULL || g == NULL
	    || !DH_set0_pqg(dh, p, NULL, g)) {
		DH_free(dh);
		BN_free(p);
		BN_free(g);
		return NULL;
	}
	return dh;
}
_EOF_

	return 0
}

gen_dh_params_openssl() {
	openssl_dhparam "${bits}" < /dev/null || return 1
	openssl_dhparam3 "${bits}" < /dev/null || return 1
	return 0
}

gen_dh_params_remote() {
	url="https://2ton.com.au/dhparam/${bits}"

	r_input="`curl -sS "${url}"`" || \
		r_input="`wget -O - -o /dev/null "${url}"`" || return 1

	if r_output="`echo "${r_input}" | openssl_dhparam`"; then
	if r_output="`echo "${r_input}" | openssl_dhparam1`"; then
		echo "${r_output}"

		return 0
	fi

	return 1
}

gen_dh_params_fallback() {
	cat << \_EOF_
#include <openssl/dh.h>
#include <openssl/bn.h>
DH *get_dhParams(void) {
	static unsigned char dhp[] = {
_EOF_
	case "${bits}" in
		2048)
			cat << \_EOF_
		0xC1,0x51,0x58,0x69,0xFB,0xE8,0x6C,0x47,0x2B,0x86,0x61,0x4F,
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echo "*****************************" >&2
echo "** Generating DH Primes.   **" >&2
echo "** This will take a while. **" >&2
echo "*****************************" >&2
echo "Use OpenSSL" >&2
gen_dh_params_openssl && exit 0
echo "Use Remote" >&2
gen_dh_params_remote && exit 0
#echo "Use Remote" >&2
#gen_dh_params_remote && exit 0
echo "Use fallback" >&2
gen_dh_params_fallback && exit 0

echo "Unable to generate parameters for DH of ${bits} bits" >&2

exit 1

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