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package crypto
import (
"fmt"
"github.com/zclconf/go-cty/cty"
"github.com/zclconf/go-cty/cty/function"
"github.com/zclconf/go-cty/cty/gocty"
"golang.org/x/crypto/bcrypt"
)
// BcryptFunc is a function that computes a hash of the given string using the
// Blowfish cipher.
var BcryptFunc = function.New(&function.Spec{
Params: []function.Parameter{
{
Name: "str",
Type: cty.String,
},
},
VarParam: &function.Parameter{
Name: "cost",
Type: cty.Number,
},
Type: function.StaticReturnType(cty.String),
Impl: func(args []cty.Value, retType cty.Type) (ret cty.Value, err error) {
defaultCost := 10
if len(args) > 1 {
var val int
if err := gocty.FromCtyValue(args[1], &val); err != nil {
return cty.UnknownVal(cty.String), err
}
defaultCost = val
}
if len(args) > 2 {
return cty.UnknownVal(cty.String), fmt.Errorf("bcrypt() takes no more than two arguments")
}
input := args[0].AsString()
out, err := bcrypt.GenerateFromPassword([]byte(input), defaultCost)
if err != nil {
return cty.UnknownVal(cty.String), fmt.Errorf("error occured generating password %s", err.Error())
}
return cty.StringVal(string(out)), nil
},
})
// Bcrypt computes a hash of the given string using the Blowfish cipher,
// returning a string in the Modular Crypt Format usually expected in the
// shadow password file on many Unix systems.
func Bcrypt(str cty.Value, cost ...cty.Value) (cty.Value, error) {
args := make([]cty.Value, len(cost)+1)
args[0] = str
copy(args[1:], cost)
return BcryptFunc.Call(args)
}
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