Examples of java.security.Signature.verify()

java.security.Signature.verify()
Verifies the passed-in signature.
A call to this method resets this signature object to the state it was in when previously initialized for verification via a call to initVerify(PublicKey). That is, the object is reset and available to verify another signature from the identity whose public key was specified in the call to initVerify. @param signature the signature bytes to be verified. @return true if the signature was verified, false if not. @exception SignatureException if this signature object is not initialized properly, the passed-in signature is improperly encoded or of the wrong type, if this signature algorithm is unable to process the input data provided, etc.


    sign = Signature.getInstance(certificate.getIdHash() + "with"
        + certificate.getIdAlg());
    sign.initVerify(certificate.getKey());
    sign.update(value.getBytes(), 0, value.getBytes().length);
    boolean result = sign.verify(signature);
    return result;


  }
}

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                               PKCSObjectIdentifiers.md2WithRSAEncryption.equals(alg0) ? "MD2withRSA" :
                               PKCSObjectIdentifiers.sha1WithRSAEncryption.equals(alg0) ? "SHA1withRSA" : null;
        Signature signObj = Signature.getInstance(signAlgString);
        signObj.initVerify(pubKey);
        signObj.update(pkacSeq.getEncoded());
        boolean verified = signObj.verify(signature);
        if(!verified) throw new Exception("SignedPublicKeyAndChallenge verification failed.");
        map.put(CERT_REQ_PUBLICKEY, pkInfo);
        map.put(CERT_REQ_PUBLICKEY_OBJ, pubKey);
        if(((DERString)ch).getString() != null) map.put(PKAC_CHALLENGE, ((DERString)ch).getString());
        return map;

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                                            "verifying RSA-SHA1 signatures.");
        }
        Signature verifier = Signature.getInstance("SHA1withRSA");
        verifier.initVerify(publicKey);
        verifier.update(message);
        return verifier.verify(signature);
    }
    
    /**
     * Load private key from various sources, including
     * <ul>

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        Signature sig = Signature.getInstance(getSigAlgName(), sigProvider);


        sig.initVerify(key);
        sig.update(this.getTBSCertList());
        if (!sig.verify(this.getSignature()))
        {
            throw new SignatureException("CRL does not verify with supplied public key.");
        }
    }

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        PublicKey pubKey = this.getPublicKey(provider);
        sig.initVerify(pubKey);
        DERBitString pkBytes = new DERBitString(pkac);
        sig.update(pkBytes.getBytes());


        return sig.verify(signature.getBytes());
    }


    public PublicKey getPublicKey(String provider)
        throws NoSuchAlgorithmException, NoSuchProviderException, 
               InvalidKeyException

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        catch (IOException e)
        {
            throw new SignatureException("Exception encoding certificate info object");
        }


        if (!signature.verify(this.getSignature()))
        {
            throw new InvalidKeyException("Public key presented not for certificate signature");
        }
    }

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        catch (Exception e)
        {
            throw new SignatureException("exception encoding TBS cert request - " + e);
        }


        return sig.verify(sigBits.getBytes());
    }


    /**
     * return a DER encoded byte array representing this object
     */

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        s.initVerify(vKey);


        s.update(data);


        if (!s.verify(sigBytes))
        {
            fail("ECDSA verification failed");
        }
    }

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        sig.initVerify(verifyKey);


        sig.update(data);


        if (!sig.verify(sigBytes))
        {
            fail("SHA256 verification failed");
        }
        
        //

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        sig.initVerify(verifyKey);


        sig.update(data);


        if (!sig.verify(sigBytes))
        {
            fail("SHA384 verification failed");
        }
        
        //

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