95 lines
3.0 KiB
Bash
Executable File
95 lines
3.0 KiB
Bash
Executable File
#!/bin/bash
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set -eu
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PARAMS_DIR="$HOME/.zcash-params"
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REGTEST_PKEY_NAME='z4-proving.key'
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REGTEST_VKEY_NAME='z4-verification.key'
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REGTEST_PKEY_URL="https://z.cash/downloads/$REGTEST_PKEY_NAME"
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REGTEST_VKEY_URL="https://z.cash/downloads/$REGTEST_VKEY_NAME"
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REGTEST_DIR="$PARAMS_DIR/regtest"
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# This should have the same params as regtest. We use symlinks for now.
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TESTNET3_DIR="$PARAMS_DIR/testnet3"
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function fetch_params {
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local url="$1"
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local output="$2"
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local dlname="${output}.dl"
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if ! [ -f "$output" ]
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then
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echo "Retrieving: $url"
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# Note: --no-check-certificate should be ok, since we rely on
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# sha256 for integrity, and there's no confidentiality requirement.
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# Our website uses letsencrypt certificates which are not supported
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# by some wget installations, so we expect some cert failures.
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wget \
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--progress=dot:giga \
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--no-check-certificate \
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--output-document="$dlname" \
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--continue \
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"$url"
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# Only after successful download do we update the parameter load path:
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mv -v "$dlname" "$output"
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fi
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}
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cat <<EOF
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zcash - fetch-params.sh
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EOF
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# Now create PARAMS_DIR and insert a README if necessary:
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if ! [ -d "$PARAMS_DIR" ]
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then
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mkdir -p "$PARAMS_DIR"
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README_PATH="$PARAMS_DIR/README"
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cat >> "$README_PATH" <<EOF
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This directory stores common zcash zkSNARK parameters. Note that is is
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distinct from the daemon's -datadir argument because the parameters are
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large and may be shared across multiple distinct -datadir's such as when
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setting up test networks.
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EOF
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# This may be the first time the user's run this script, so give
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# them some info, especially about bandwidth usage:
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cat <<EOF
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This script will fetch the Zcash zkSNARK parameters and verify their
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integrity with sha256sum.
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The parameters currently are about 2GiB in size, so plan accordingly
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for your bandwidth constraints. If the files are already present and
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have the correct sha256sum, no networking is used.
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Creating params directory. For details about this directory, see:
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$README_PATH
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EOF
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fi
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mkdir -p "$REGTEST_DIR"
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fetch_params "$REGTEST_PKEY_URL" "$REGTEST_DIR/$REGTEST_PKEY_NAME"
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fetch_params "$REGTEST_VKEY_URL" "$REGTEST_DIR/$REGTEST_VKEY_NAME"
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echo 'Updating testnet3 symlinks to regtest parameters.'
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mkdir -p "$TESTNET3_DIR"
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ln -sf "../regtest/$REGTEST_PKEY_NAME" "$TESTNET3_DIR/$REGTEST_PKEY_NAME"
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ln -sf "../regtest/$REGTEST_VKEY_NAME" "$TESTNET3_DIR/$REGTEST_VKEY_NAME"
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cd "$PARAMS_DIR"
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# Now verify their hashes:
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echo 'Verifying parameter file integrity via sha256sum...'
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shasum -a 256 --check <<EOF
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25014d1a836b180b9afc847b98feb9fadf43afd2875ecf1a026c2aed0d74f5d0 regtest/$REGTEST_PKEY_NAME
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25014d1a836b180b9afc847b98feb9fadf43afd2875ecf1a026c2aed0d74f5d0 testnet3/$REGTEST_PKEY_NAME
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e6b1afb87d24b41a9abc9e3500c0758f377c172505cd5795bac713b5de737388 regtest/$REGTEST_VKEY_NAME
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e6b1afb87d24b41a9abc9e3500c0758f377c172505cd5795bac713b5de737388 testnet3/$REGTEST_VKEY_NAME
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EOF
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