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package awskms
import (
"context"
"crypto"
"crypto/rand"
"crypto/rsa"
"crypto/sha1"
"crypto/sha256"
"encoding/pem"
"fmt"
"hash"
"testing"
"github.com/aws/aws-sdk-go-v2/service/kms"
"github.com/stretchr/testify/require"
"go.step.sm/crypto/kms/apiv1"
"go.step.sm/crypto/pemutil"
)
func TestCreateDecrypter(t *testing.T) {
key, err := pemutil.ParseKey([]byte(rsaPublicKey))
require.NoError(t, err)
require.IsType(t, &rsa.PublicKey{}, key)
rsaKey := key.(*rsa.PublicKey)
k := &KMS{client: &MockClient{
getPublicKey: func(ctx context.Context, input *kms.GetPublicKeyInput, opts ...func(*kms.Options)) (*kms.GetPublicKeyOutput, error) {
block, _ := pem.Decode([]byte(rsaPublicKey))
return &kms.GetPublicKeyOutput{
KeyId: input.KeyId,
PublicKey: block.Bytes,
}, nil
},
}}
// fail with empty decryption key
d, err := k.CreateDecrypter(&apiv1.CreateDecrypterRequest{
DecryptionKey: "",
})
require.Error(t, err)
require.Nil(t, d)
// expect same public key to be returned
d, err = k.CreateDecrypter(&apiv1.CreateDecrypterRequest{
DecryptionKey: "test",
})
require.NoError(t, err)
require.NotNil(t, d)
require.True(t, rsaKey.Equal(d.Public()))
}
func TestDecrypterDecrypts(t *testing.T) {
kms, pub := createTestKMS(t, 2048)
fail1024KMS, _ := createTestKMS(t, 1024)
// prepare encrypted contents
encSHA256, err := rsa.EncryptOAEP(sha256.New(), rand.Reader, pub, []byte("test"), nil)
require.NoError(t, err)
encSHA1, err := rsa.EncryptOAEP(sha1.New(), rand.Reader, pub, []byte("test"), nil)
require.NoError(t, err)
// create a decrypter, identified by "test-sha256", and check the public key
d256, err := kms.CreateDecrypter(&apiv1.CreateDecrypterRequest{
DecryptionKey: "test-sha256",
})
require.NoError(t, err)
require.NotNil(t, d256)
require.True(t, pub.Equal(d256.Public()))
// create a decrypter, identified by "test-sha1", and check the public key
d1, err := kms.CreateDecrypter(&apiv1.CreateDecrypterRequest{
DecryptionKey: "test-sha1",
})
require.NoError(t, err)
require.NotNil(t, d1)
require.True(t, pub.Equal(d1.Public()))
t.Run("ok/sha256", func(t *testing.T) {
// successful decryption using OAEP with SHA-256
plain, err := d256.Decrypt(nil, encSHA256, &rsa.OAEPOptions{Hash: crypto.SHA256})
require.NoError(t, err)
require.Equal(t, []byte("test"), plain)
})
t.Run("ok/sha1", func(t *testing.T) {
// successful decryption using OAEP with SHA-1
plain, err := d1.Decrypt(nil, encSHA1, &rsa.OAEPOptions{Hash: crypto.SHA1})
require.NoError(t, err)
require.Equal(t, []byte("test"), plain)
})
t.Run("ok/default-options", func(t *testing.T) {
// successful decryption, defaulting to OAEP with SHA-256
plain, err := d256.Decrypt(nil, encSHA256, nil)
require.NoError(t, err)
require.Equal(t, []byte("test"), plain)
})
t.Run("fail/hash", func(t *testing.T) {
plain, err := d256.Decrypt(nil, encSHA256, &rsa.OAEPOptions{Hash: crypto.SHA384})
require.EqualError(t, err, `failed determining decryption algorithm: awskms does not support hash algorithm "SHA-384" with RSA-OAEP`)
require.Empty(t, plain)
})
t.Run("fail/label", func(t *testing.T) {
plain, err := d256.Decrypt(nil, encSHA256, &rsa.OAEPOptions{Hash: crypto.SHA256, Label: []byte{1, 2, 3, 4}})
require.EqualError(t, err, "failed determining decryption algorithm: awskms does not support RSA-OAEP label")
require.Empty(t, plain)
})
t.Run("fail/hash-mismatch", func(t *testing.T) {
plain, err := d256.Decrypt(nil, encSHA256, &rsa.OAEPOptions{Hash: crypto.SHA256, MGFHash: crypto.SHA384})
require.EqualError(t, err, `failed determining decryption algorithm: awskms does not support using different algorithms for hashing "SHA-256" and masking "SHA-384"`)
require.Empty(t, plain)
})
t.Run("fail/pkcs15", func(t *testing.T) {
plain, err := d256.Decrypt(nil, encSHA256, &rsa.PKCS1v15DecryptOptions{})
require.EqualError(t, err, "failed determining decryption algorithm: awskms does not support PKCS #1 v1.5 decryption")
require.Empty(t, plain)
})
t.Run("fail/invalid-options", func(t *testing.T) {
plain, err := d256.Decrypt(nil, encSHA256, struct{}{})
require.EqualError(t, err, "failed determining decryption algorithm: invalid decrypter options type struct {}")
require.Empty(t, plain)
})
t.Run("fail/invalid-key", func(t *testing.T) {
failingDecrypter, err := fail1024KMS.CreateDecrypter(&apiv1.CreateDecrypterRequest{
DecryptionKey: "fail",
})
require.NoError(t, err)
_, err = failingDecrypter.Decrypt(nil, nil, nil)
require.EqualError(t, err, "failed determining decryption algorithm: awskms does not support RSA public key size 1024")
})
}
func createTestKMS(t *testing.T, bitSize int) (*KMS, *rsa.PublicKey) {
t.Helper()
key, err := rsa.GenerateKey(rand.Reader, bitSize)
require.NoError(t, err)
k := &KMS{client: &MockClient{
getPublicKey: func(ctx context.Context, input *kms.GetPublicKeyInput, opts ...func(*kms.Options)) (*kms.GetPublicKeyOutput, error) {
block, _ := pemutil.Serialize(key.Public())
return &kms.GetPublicKeyOutput{
KeyId: input.KeyId,
PublicKey: block.Bytes,
}, nil
},
decrypt: func(ctx context.Context, params *kms.DecryptInput, optFns ...func(*kms.Options)) (*kms.DecryptOutput, error) {
var h hash.Hash
switch *params.KeyId {
case "test-sha256":
if params.EncryptionAlgorithm != "RSAES_OAEP_SHA_256" {
return nil, fmt.Errorf("invalid encryption algorithm %q", params.EncryptionAlgorithm)
}
h = sha256.New()
case "test-sha1":
if params.EncryptionAlgorithm != "RSAES_OAEP_SHA_1" {
return nil, fmt.Errorf("invalid encryption algorithm %q", params.EncryptionAlgorithm)
}
h = sha1.New()
default:
return nil, fmt.Errorf("invalid key ID %q", *params.KeyId)
}
dec, err := rsa.DecryptOAEP(h, nil, key, params.CiphertextBlob, nil)
if err != nil {
return nil, err
}
return &kms.DecryptOutput{
KeyId: params.KeyId,
Plaintext: dec,
}, nil
},
}}
return k, &key.PublicKey
}
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