Merge pull request #507 from Electric-Coin-Company/zc.v0.11.2.ticket490.copy-fetch-params-from-alpha.0
zc.v0.11.2.ticket490.copy-fetch-params-from-alpha.0
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#!/bin/bash
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set -eu
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PARAMS_DIR="$HOME/.zcash-params"
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REGTEST_PKEY_NAME='zc-testnet-public-alpha-proving.key'
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REGTEST_VKEY_NAME='zc-testnet-public-alpha-verification.key'
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REGTEST_PKEY_URL="https://zca.sh/downloads/$REGTEST_PKEY_NAME"
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REGTEST_VKEY_URL="https://zca.sh/downloads/$REGTEST_VKEY_NAME"
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REGTEST_DIR="$PARAMS_DIR/regtest"
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# Note: This assumes cwd is set appropriately!
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function fetch_params {
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local url="$1"
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local filename="$(echo "$url" | sed 's,^.*/,,')"
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if ! [ -f "$filename" ]
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then
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echo "Retrieving: $url"
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wget --progress=dot:giga "$url"
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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 zerocash 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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cd "$REGTEST_DIR"
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fetch_params "$REGTEST_PKEY_URL"
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fetch_params "$REGTEST_VKEY_URL"
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# Now verify their hashes:
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echo 'Verifying parameter file integrity via sha256sum...'
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sha256sum --check - <<EOF
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bc03442cc53fa53a681809afa64c91e8c37d2db1f51eb2355e4fe181d24ce878 $REGTEST_PKEY_NAME
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67d60eeb10541ec2086e56d8dffa850e371b69ddb82fc5686c26921ad2b0f654 $REGTEST_VKEY_NAME
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EOF
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