gost_engine: add CI test

Thi adds one MD and one cipher test from upstream, adapted to a shell
script.

Signed-off-by: Eneas U de Queiroz <cotequeiroz@gmail.com>

libs/gost_engine/test.sh

@@ -0,0 +1,80 @@
+#!/bin/sh
+# shellcheck disable=SC2059
+
+run_md_test () {
+	[ $# -ge 3 ] || {
+		echo "Error: insufficient args to run_md_test()" >&2
+		exit 1
+	}
+	DGST="$1";  shift
+	INP="$1"; shift
+	EXP="$1"; shift
+	printf "Testing digest %s: " "$DGST" >&2
+	OUT="$(printf "$INP" | openssl dgst -"$DGST" "$@")" || exit 1
+	[ -z "${OUT%%*"$EXP"}" ] || {
+		printf "Failure: expected: '%s', got '%s'\n" "$EXP" "$OUT" >&2
+		exit 1
+	}
+	echo OK >&2 || true
+}
+
+run_cipher_test() {
+	[ $# -ge 5 ] || {
+		echo "Error: insufficient args to run_cipher_test()" >&2
+		exit 1
+	}
+	ALG="$1"; shift
+	KEY="$1"; shift
+	IV="$1"; shift
+	CLEAR_TEXT="$1"; shift
+	CIPHER_TEXT="$1"; shift
+	printf "Testing %s encryption: " "$ALG" >&2
+	OUT="$(printf "$CLEAR_TEXT" | openssl enc -e -"$ALG" -K "$KEY" -iv "$IV" "$@" -a -A)" || exit 1
+	[ -z "${OUT%"$CIPHER_TEXT"}" ] || {
+		printf "Encryption failure: expected: '%s', got '%s'\n" "$CIPHER_TEXT" "$OUT" >&2
+		exit 1
+	}
+	echo OK >&2
+	printf "Testing %s decryption: " "$ALG" >&2
+	OUT="$(printf "$CIPHER_TEXT" | openssl enc -d -"$ALG" -K "$KEY" -iv "$IV" "$@" -a -A)" || exit 1
+	[ -z "${OUT%"$(printf "$CLEAR_TEXT")"}" ] || {
+		echo "Decryption failure!" >&2
+		echo "----------- expected hexdump -------------" >&2
+		printf "$CLEAR_TEXT" | hexdump -C
+		echo "------------ result hexdump --------------" >&2
+		echo "$OUT" | hexdump -C >&2
+		exit 1
+	}
+	echo OK >&2 || true
+}
+
+case "$1" in
+	libopenssl-gost_engine)
+		opkg install openssl-util
+		run_md_test \
+			md_gost12_256 \
+			012345678901234567890123456789012345678901234567890123456789012 \
+			9d151eefd8590b89daa6ba6cb74af9275dd051026bb149a452fd84e5e57b5500
+		export CRYPT_PARAMS="1.2.643.2.2.31.1"
+		run_cipher_test \
+			gost89 \
+			0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF \
+			0000000000000000 \
+			"The quick brown fox jumps over the lazy dog\n" \
+			"B/QQLGGFxKCeZ24mm/pLycXfZXWRa4eb0TqJOiKF7maQEHze73oxXS61S/o="
+		;;
+	gost_engine-util)
+		printf "Testing gost12sum: "
+		EXP=9d151eefd8590b89daa6ba6cb74af9275dd051026bb149a452fd84e5e57b5500
+		OUT=$(printf 012345678901234567890123456789012345678901234567890123456789012 | gost12sum)
+		[ -z "${OUT##"$EXP"*}" ] || {
+			printf "Failure: expected: '%s', got '%s'\n" "$EXP" "$OUT" >&2
+			exit 1
+		}
+		echo OK >&2 || true
+		;;
+	*)
+		echo "Unexpected package '$1'" >&2
+		exit 1
+		;;
+esac