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sign_test.go
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sign_test.go
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package poudriereakv_test
import (
"context"
"crypto"
"crypto/rsa"
"crypto/sha256"
"crypto/x509"
"encoding/pem"
"os"
"testing"
"github.com/backerman/poudriereakv"
. "github.com/smartystreets/goconvey/convey"
)
func TestSignature(t *testing.T) {
Convey("Given a SHA-256 digest and a key", t, func() {
keyURI := os.Getenv("TEST_KEY")
key, err := poudriereakv.GetKey(keyURI)
So(err, ShouldBeNil)
Convey("A digest should be signable", func() {
message := []byte("The magic words are squeamish ossifrage.")
digest := sha256.Sum256(message)
ctx := context.Background()
result, err := key.Sign(ctx, digest[:])
So(err, ShouldBeNil)
So(result.KeyID, ShouldStartWith, keyURI)
// A PKCS#1 signature is always exactly the length of
// the modulus, which here is 2048 bits.
So(result.Signature, ShouldHaveLength, 256)
Convey("The signature should be verifiable", func() {
block, rest := pem.Decode(key.PEMKey)
So(rest, ShouldBeEmpty)
So(block.Type, ShouldEqual, "PUBLIC KEY")
pubKey, err := x509.ParsePKIXPublicKey(block.Bytes)
So(err, ShouldBeNil)
err = rsa.VerifyPKCS1v15(
pubKey.(*rsa.PublicKey), crypto.SHA256, digest[:], result.Signature)
So(err, ShouldBeNil)
})
})
})
}