#!/usr/bin/env bash

set -e
if [ -z "$O3" ]; then
    echo O3 var must point to ovpn3 tree
    exit 1
fi
if [ -z "$TARGET" ]; then
    echo TARGET var must be defined
    exit 1
fi

[ -z "$DL" ] && DL=~/Downloads

. $O3/core/vars/vars-$TARGET
. $O3/core/deps/lib-versions

# Build ASM files with clang 3.0
if [ "$APPLE_FAMILY" = "1" ]; then
    GCC_AS_CMD=$HOME/clang3/clang
    if ! [ -f "$GCC_AS_CMD" ]; then
	echo "clang 3.0 binary must be present in $GCC_AS_CMD to assemble ARM crypto algorithms"
	exit 1
    fi
fi

DEST=minicrypto/minicrypto-$PLATFORM

GLOBAL_COMPILE_FLAGS="$PLATFORM_FLAGS $OTHER_COMPILER_FLAGS $LIB_OPT_LEVEL $LIB_FPIC -DSHA1_ASM -DBF_PTR -DOPENSSL_VERSION_PTEXT= -D__LP32__"

[ -z "$GCC_CMD" ] && GCC_CMD=gcc
[ -z "$GCC_AS_CMD" ] && GCC_AS_CMD="$GCC_CMD"
[ -z "$AR_CMD" ] && AR_CMD=ar
# the directory where this script lives
H=$O3/core/deps/minicrypto

if [ "$NO_WIPE" != "1" ]; then
    # unzip OpenSSL
    rm -rf $OPENSSL_VERSION
    tar xfz $DL/$OPENSSL_VERSION.tar.gz
fi

OPENSSL_DIR=$(pwd)/$OPENSSL_VERSION

# make build directory
mkdir -p minicrypto
rm -rf minicrypto/minicrypto-$PLATFORM
mkdir -p minicrypto/minicrypto-$PLATFORM/build.tmp
cd minicrypto/minicrypto-$PLATFORM/build.tmp
mkdir openssl

# copy files from OpenSSL tree

# ARM
cp $OPENSSL_DIR/crypto/arm_arch.h .

# SHA general
cp $OPENSSL_DIR/crypto/md32_common.h .
cp $OPENSSL_DIR/crypto/sha/sha.h openssl

# AES
cp $OPENSSL_DIR/crypto/aes/asm/aes-armv4.pl .

# SHA1
cp $OPENSSL_DIR/crypto/sha/asm/sha1-armv4-large.pl .
cp $OPENSSL_DIR/crypto/sha/sha_locl.h .
cp $OPENSSL_DIR/crypto/sha/sha1dgst.c .

# SHA2
cp $OPENSSL_DIR/crypto/sha/sha256.c .
cp $OPENSSL_DIR/crypto/sha/asm/sha256-armv4.pl .

# SHA4
cp $OPENSSL_DIR/crypto/sha/sha512.c .
cp $OPENSSL_DIR/crypto/sha/asm/sha512-armv4.pl .

# note that OPENSSL_cleanse is not used by any
# of the functions we are interested in
cat >openssl/crypto.h <<EOF
#define fips_md_init(alg) fips_md_init_ctx(alg, alg)
#define fips_md_init_ctx(alg, cx) int alg##_Init(cx##_CTX *c)
#define OPENSSL_cleanse(ptr, len) memset((ptr), 0, (len))
EOF

# irrelevant headers
touch openssl/e_os2.h
touch openssl/opensslconf.h
touch openssl/opensslv.h
touch aes_locl.h
touch cryptlib.h
touch crypto.h

# patches
patch <$H/aes-armv4.pl.patch
patch <$H/sha512-armv4.pl.patch
perl -pi -e 's/private_//g' aes-armv4.pl
for f in aes-armv4.pl sha256-armv4.pl sha512-armv4.pl ; do # armv4cpuid.pre
    perl -pi -e 's/^(\.code.*)$/\/* \1 *\//' $f
done

# build C files
for f in *.c ; do
    COMPILE_FLAGS="-Wno-unused-value"
    CMD="$GCC_CMD $GLOBAL_COMPILE_FLAGS $COMPILE_FLAGS -I. -c $f"
    echo $CMD
    $CMD
done

# build armv4cpuid.S
#$O3/core/deps/minicrypto/arm-as-to-ios <armv4cpuid.pre >armv4cpuid.S
#CMD="$GCC_AS_CMD $GLOBAL_COMPILE_FLAGS -DSYS_macosx -DNO_THUMB -c armv4cpuid.S"
#echo $CMD
#$CMD

# build the ASM files given as perl source
for f in *.pl ; do
    bn=${f%%.pl}
    S=$bn.S
    COMPILE_FLAGS=""
    CVT_FLAGS=""
    if [ "$APPLE_FAMILY" = "1" ]; then
	COMPILE_FLAGS="$COMPILE_FLAGS -DNO_THUMB"
	[ "$bn" = "aes-armv4" ] && CVT_FLAGS="$CVT_FLAGS --global=!ad1,!ad2,!ad3"
	[ "$bn" = "sha512-armv4" ] && CVT_FLAGS="$CVT_FLAGS --global=!HI,!LO"
	perl $f | $O3/core/deps/minicrypto/arm-as-to-ios --stdin $CVT_FLAGS >$S
    else
	perl $f >$S	
    fi
    CMD="$GCC_AS_CMD $GLOBAL_COMPILE_FLAGS $COMPILE_FLAGS -DSYS_macosx -c $S"
    echo $CMD
    $CMD
done

CMD="$AR_CMD crs ../libminicrypto.a *.o"
echo $CMD
$CMD
exit 0