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wrap crypto_sign_detached, w/ tests #2

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wrap crypto_sign_detached, w/ tests #2

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23 changes: 23 additions & 0 deletions sodium/crypto_sign.go
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Original file line number Diff line number Diff line change
Expand Up @@ -44,6 +44,29 @@ func Sign(sealedMessageOut []byte, message []byte, sk []byte) int {
(*C.uchar)(&sk[0])))
}

func SignDetached(detachedSealOut []byte, message []byte, sk []byte) int {
checkSize(detachedSealOut, SignBytes(), "signature output")
checkSize(sk, SignSecretKeyBytes(), "secret key")

return int(C.crypto_sign_detached(
(*C.uchar)(&detachedSealOut[0]),
nil,
(*C.uchar)(&message[0]),
(C.ulonglong)(len(message)),
(*C.uchar)(&sk[0])))
}

func SignVerifyDetached(sig []byte, message []byte, pk []byte) int {
checkSize(sig, SignBytes(), "signature input")
checkSize(pk, SignPublicKeyBytes(), "public key")

return int(C.crypto_sign_verify_detached(
(*C.uchar)(&sig[0]),
(*C.uchar)(&message[0]),
(C.ulonglong)(len(message)),
(*C.uchar)(&pk[0])))
}

func SignOpen(messageOut []byte, sealedMessage []byte, pk []byte) int {
checkSize(messageOut, len(sealedMessage)-SignBytes(), "message output")
checkSize(pk, SignPublicKeyBytes(), "public key")
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13 changes: 13 additions & 0 deletions sodium/crypto_sign_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -36,6 +36,13 @@ func TestSignAndVerify(t *testing.T) {
t.Fatalf("bad result signing: %v", ret)
}

// detached sign the message
signed_detached := make([]byte, SignBytes())
ret = SignDetached(signed_detached, msg, Sk)
if ret != 0 {
t.Fatalf("bad result signing detached: %v", ret)
}

// verify message
msg2 := make([]byte, len(msg))
ret = SignOpen(msg2, signed, Pk)
Expand All @@ -46,6 +53,12 @@ func TestSignAndVerify(t *testing.T) {
t.Fatalf("different unsealed message")
}

// verify detached
ret = SignVerifyDetached(signed_detached, msg, Pk)
if ret != 0 {
t.Fatalf("bad result verifying detached: %v", ret)
}

// try corrupting the message at various points
corruptedCopy := make([]byte, len(signed))
for c := 0; c < len(signed); c += 100 {
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