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POsignature.verify() Always returns False
 

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  1. POsignature.verify() Always returns False
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    <pre><code> public static void main(String[] args) { try{ String mod = "q0AwozeUj0VVkoksDQSCTj3QEgODomq4sAr02xMyIrWldZrNHhWfZAIcWt2MuAY3X6S3ZVUfOFXOrVbltRrO3F9Z6R8/jJIMv7wjkeVBFC5gncwGR0C3aV9gmF6II19jTKfF1sxb26iMEMAlMEOSnAAceNaJH91zBoaW7ZIh+qk="; String exp = "AQAB"; byte[] modulusBytes = Base64.decodeBase64(mod.getBytes("UTF-8")); byte[] exponentBytes = Base64.decodeBase64(exp.getBytes("UTF-8")); String signedMessage = "3753e672cfb21e3c182ef2df51f19edeffb63432ed338a47251326ccc14aa63883e910a140cf313754ebc6425aad434e309307cc882da6cd4a4f9f40bd14a9823aca145e5ffc97cd63dbb5925c049282416bdfd7d74ddeef7055065210a841793fe315dff5a44af19c1522daafdc2f7e61ce5a2b42ebf79dfb086e6d210168dd"; BigInteger modulus = new BigInteger(1, modulusBytes ); BigInteger exponent = new BigInteger(1, exponentBytes); RSAPublicKeySpec rsaPubKey = new RSAPublicKeySpec(modulus, exponent); KeyFactory fact = KeyFactory.getInstance("RSA"); PublicKey pubKey = fact.generatePublic(rsaPubKey); Signature signature = Signature.getInstance("SHA1withRSA"); byte[] sigBytes = hexStringToByteArray(signedMessage); signature.initVerify(pubKey); System.out.println(signature.verify(sigBytes)); }catch(Exception e){ System.out.println("Error: " + e.toString()); } } private static byte[] hexStringToByteArray(final String encoded) { if ((encoded.length() % 2) != 0) throw new IllegalArgumentException("Input string must contain an even number of characters"); final byte result[] = new byte[encoded.length()/2]; final char enc[] = encoded.toCharArray(); for (int i = 0; i &lt; enc.length; i += 2) { StringBuilder curr = new StringBuilder(2); curr.append(enc[i]).append(enc[i + 1]); result[i/2] = (byte) Integer.parseInt(curr.toString(), 16); } return result; } </code></pre> <p>This code always returns false. I'm not sure where to go from here.</p>
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    1. USJimmy
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    1. This table or related slice is empty.
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    1. This table or related slice is empty.
    1. PO
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      1. POsignature.verify() Always returns False
      1. USsammiwei
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    2. VO
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      1. POsignature.verify() Always returns False
      1. USAshish Agarwal
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    1. COYou are verifying against nothing. It would only return true if your signature is also generated for empty data.
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      1. POsignature.verify() Always returns False
      1. USZZ Coder
    2. COI thought I was verifying it against the sigBytes. Do you know how I would fix this?
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      1. POsignature.verify() Always returns False
      1. USJimmy
 

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