Digital Signature Verification for more than 256 lenght

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I am using RSA algorithm for the verification of digital signature in which take a 256 length....
But I have to verify packets which have a variable lenght of signature like(344,328).If I will use RSA then got error below..



Exception in thread "main" java.security.SignatureException: Signature length not correct: got 328 but was expecting 256..


So which Algo I use which will verify signature of varibale lenght?










share|improve this question






















  • How was the signature created? Don't but the data to be signed in the RSA signature, that is insecure! Only sign the hash (use a common RSA signature standard for that). Note that for an RSA2048 bit key the maximum data size is 256 bytes, this is a mathematical fact and can't be changed by anybody!
    – Robert
    Dec 27 at 13:20












  • Actually I am Working on Bank Project in which i have no information about how they are created but I got incoming packed(from bank whose lenght is 344,328) which have to verify from my side....Is it possible to verify signature of more than 256 lenght
    – Aashish Gossel
    Dec 27 at 13:24












  • Then way don't you use the methods provided by Java for verifying an RSA signature? Anyway you have to know which standard is used for signature generation if you want to verify it.
    – Robert
    Dec 27 at 13:29


















0














I am using RSA algorithm for the verification of digital signature in which take a 256 length....
But I have to verify packets which have a variable lenght of signature like(344,328).If I will use RSA then got error below..



Exception in thread "main" java.security.SignatureException: Signature length not correct: got 328 but was expecting 256..


So which Algo I use which will verify signature of varibale lenght?










share|improve this question






















  • How was the signature created? Don't but the data to be signed in the RSA signature, that is insecure! Only sign the hash (use a common RSA signature standard for that). Note that for an RSA2048 bit key the maximum data size is 256 bytes, this is a mathematical fact and can't be changed by anybody!
    – Robert
    Dec 27 at 13:20












  • Actually I am Working on Bank Project in which i have no information about how they are created but I got incoming packed(from bank whose lenght is 344,328) which have to verify from my side....Is it possible to verify signature of more than 256 lenght
    – Aashish Gossel
    Dec 27 at 13:24












  • Then way don't you use the methods provided by Java for verifying an RSA signature? Anyway you have to know which standard is used for signature generation if you want to verify it.
    – Robert
    Dec 27 at 13:29
















0












0








0







I am using RSA algorithm for the verification of digital signature in which take a 256 length....
But I have to verify packets which have a variable lenght of signature like(344,328).If I will use RSA then got error below..



Exception in thread "main" java.security.SignatureException: Signature length not correct: got 328 but was expecting 256..


So which Algo I use which will verify signature of varibale lenght?










share|improve this question













I am using RSA algorithm for the verification of digital signature in which take a 256 length....
But I have to verify packets which have a variable lenght of signature like(344,328).If I will use RSA then got error below..



Exception in thread "main" java.security.SignatureException: Signature length not correct: got 328 but was expecting 256..


So which Algo I use which will verify signature of varibale lenght?







java






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Dec 27 at 13:15









Aashish Gossel

32




32












  • How was the signature created? Don't but the data to be signed in the RSA signature, that is insecure! Only sign the hash (use a common RSA signature standard for that). Note that for an RSA2048 bit key the maximum data size is 256 bytes, this is a mathematical fact and can't be changed by anybody!
    – Robert
    Dec 27 at 13:20












  • Actually I am Working on Bank Project in which i have no information about how they are created but I got incoming packed(from bank whose lenght is 344,328) which have to verify from my side....Is it possible to verify signature of more than 256 lenght
    – Aashish Gossel
    Dec 27 at 13:24












  • Then way don't you use the methods provided by Java for verifying an RSA signature? Anyway you have to know which standard is used for signature generation if you want to verify it.
    – Robert
    Dec 27 at 13:29




















  • How was the signature created? Don't but the data to be signed in the RSA signature, that is insecure! Only sign the hash (use a common RSA signature standard for that). Note that for an RSA2048 bit key the maximum data size is 256 bytes, this is a mathematical fact and can't be changed by anybody!
    – Robert
    Dec 27 at 13:20












  • Actually I am Working on Bank Project in which i have no information about how they are created but I got incoming packed(from bank whose lenght is 344,328) which have to verify from my side....Is it possible to verify signature of more than 256 lenght
    – Aashish Gossel
    Dec 27 at 13:24












  • Then way don't you use the methods provided by Java for verifying an RSA signature? Anyway you have to know which standard is used for signature generation if you want to verify it.
    – Robert
    Dec 27 at 13:29


















How was the signature created? Don't but the data to be signed in the RSA signature, that is insecure! Only sign the hash (use a common RSA signature standard for that). Note that for an RSA2048 bit key the maximum data size is 256 bytes, this is a mathematical fact and can't be changed by anybody!
– Robert
Dec 27 at 13:20






How was the signature created? Don't but the data to be signed in the RSA signature, that is insecure! Only sign the hash (use a common RSA signature standard for that). Note that for an RSA2048 bit key the maximum data size is 256 bytes, this is a mathematical fact and can't be changed by anybody!
– Robert
Dec 27 at 13:20














Actually I am Working on Bank Project in which i have no information about how they are created but I got incoming packed(from bank whose lenght is 344,328) which have to verify from my side....Is it possible to verify signature of more than 256 lenght
– Aashish Gossel
Dec 27 at 13:24






Actually I am Working on Bank Project in which i have no information about how they are created but I got incoming packed(from bank whose lenght is 344,328) which have to verify from my side....Is it possible to verify signature of more than 256 lenght
– Aashish Gossel
Dec 27 at 13:24














Then way don't you use the methods provided by Java for verifying an RSA signature? Anyway you have to know which standard is used for signature generation if you want to verify it.
– Robert
Dec 27 at 13:29






Then way don't you use the methods provided by Java for verifying an RSA signature? Anyway you have to know which standard is used for signature generation if you want to verify it.
– Robert
Dec 27 at 13:29



















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