Hi,
I've checked the SHA256 function from bouncycastle and it seems generate
the hash correctly. At least from the few
experiments I've done.
But since I need to verify RSA signature with SHA256 I would have to
replace the SHA256Digest() implementation from
bouncycaste with a new one. So even if I would try to use example from
Francesco, it would have to change it to provide
org.bouncycastle.crypto.Digest interface. That would require proper tests
if the implementation works as intended.
The code for verifying the signature looks like this:
RSADigestSigner signer = new RSADigestSigner(new SHA256Digest());
signer.init(false, new RSAKeyParameters(false, modulus, exponent));
try {
signer.update(data.getBytes("UTF-8"), 0,
data.getBytes("UTF-8").length);
} catch (UnsupportedEncodingException ex) {
Log.e(ex);
}
boolean verified = signer.verifySignature(sigDecode);
(it's from the example in the first post)
Dátum: štvrtok 2. júla 2020, čas: 5:25:53 UTC+2, odosielateľ: Shai Almog
> Hi,
> the BC BigInteger predated our own implementation.
> Which code did you use to verify a signature?
> Did you try the code from Francesco
>
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