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crypto.go
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crypto.go
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// Copyright 2022 Snyk Ltd
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package funcs
import (
"crypto/md5"
"crypto/sha1"
"crypto/sha256"
"crypto/sha512"
"encoding/base64"
"encoding/hex"
"hash"
"io"
"github.com/spf13/afero"
"github.com/zclconf/go-cty/cty"
"github.com/zclconf/go-cty/cty/function"
)
// MakeFileBase64Sha256Func constructs a function that is like Base64Sha256Func but reads the
// contents of a file rather than hashing a given literal string.
func MakeFileBase64Sha256Func(fsys afero.Fs, baseDir string) function.Function {
return makeFileHashFunction(fsys, baseDir, sha256.New, base64.StdEncoding.EncodeToString)
}
func MakeFileBase64Sha512Func(fsys afero.Fs, baseDir string) function.Function {
return makeFileHashFunction(fsys, baseDir, sha512.New, base64.StdEncoding.EncodeToString)
}
// MakeFileMd5Func constructs a function that is like Md5Func but reads the
// contents of a file rather than hashing a given literal string.
func MakeFileMd5Func(fsys afero.Fs, baseDir string) function.Function {
return makeFileHashFunction(fsys, baseDir, md5.New, hex.EncodeToString)
}
// MakeFileSha1Func constructs a function that is like Sha1Func but reads the
// contents of a file rather than hashing a given literal string.
func MakeFileSha1Func(fsys afero.Fs, baseDir string) function.Function {
return makeFileHashFunction(fsys, baseDir, sha1.New, hex.EncodeToString)
}
// MakeFileSha256Func constructs a function that is like Sha256Func but reads the
// contents of a file rather than hashing a given literal string.
func MakeFileSha256Func(fsys afero.Fs, baseDir string) function.Function {
return makeFileHashFunction(fsys, baseDir, sha256.New, hex.EncodeToString)
}
// MakeFileSha512Func constructs a function that is like Sha512Func but reads the
// contents of a file rather than hashing a given literal string.
func MakeFileSha512Func(fsys afero.Fs, baseDir string) function.Function {
return makeFileHashFunction(fsys, baseDir, sha512.New, hex.EncodeToString)
}
func makeFileHashFunction(fsys afero.Fs, baseDir string, hf func() hash.Hash, enc func([]byte) string) function.Function {
return function.New(&function.Spec{
Params: []function.Parameter{
{
Name: "path",
Type: cty.String,
},
},
Type: function.StaticReturnType(cty.String),
Impl: func(args []cty.Value, retType cty.Type) (ret cty.Value, err error) {
path := args[0].AsString()
f, err := openFile(fsys, baseDir, path)
if err != nil {
return cty.UnknownVal(cty.String), err
}
defer f.Close()
h := hf()
_, err = io.Copy(h, f)
if err != nil {
return cty.UnknownVal(cty.String), err
}
rv := enc(h.Sum(nil))
return cty.StringVal(rv), nil
},
})
}