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Throw CryptoException when signing

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mose05
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Throw CryptoException when signing

Post by mose05 » Thu Oct 27, 2016 11:07 pm

When I used Signature to sign, it always threw CryptoException, reason value is 5. Does anyone have this experience? How can I solve this issue?
Thanks a lot.
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mabel
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Re: Throw CryptoException when signing

Post by mabel » Fri Oct 28, 2016 3:55 am

Tell us the Signature algorithm and padding type you used.
Last edited by mabel on Fri Oct 28, 2016 4:33 am, edited 1 time in total.
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Re: Throw CryptoException when signing

Post by mose05 » Fri Oct 28, 2016 3:58 am

mabel wrote:Tell us the Signature algorithm and filler type you used.


Signature algorithm: ALG_RSA_SHA_512_PKCS1

RSA key length: 512bits
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mabel
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Re: Throw CryptoException when signing

Post by mabel » Fri Oct 28, 2016 4:54 am

The Signature data length that pkcs1 padding algorithm needs should be less than (64-11) bytes.
However, SHA512 Hash result is just 512, which doesnot satisfy with Signature data length requirement. So it will throw exception.
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Re: Throw CryptoException when signing

Post by tomc2016 » Fri Oct 28, 2016 5:08 am

Don't use RSA512 to do the computations. Use RSA1024 or RSA2048 instead. The computation speed of RSA1024 and RSA2048 is also very fast.
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Re: Throw CryptoException when signing

Post by mose05 » Fri Oct 28, 2016 5:12 am

Thanks for all the help. I got it.
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tay00000
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Re: Throw CryptoException when signing

Post by tay00000 » Mon Oct 31, 2016 9:50 am

Just curious, which card are you using that will support Signature.ALG_RSA_SHA_512_PKCS1 ?

I am interested in getting one too.
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UNKNwYSHSA
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Re: Throw CryptoException when signing

Post by UNKNwYSHSA » Mon Oct 31, 2016 10:42 pm

Same question.
sense and simplicity
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mose05
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Re: Throw CryptoException when signing

Post by mose05 » Mon Oct 31, 2016 11:26 pm

tay00000 wrote:Just curious, which card are you using that will support Signature.ALG_RSA_SHA_512_PKCS1 ?

I am interested in getting one too.

My colleague gave it to me. I don't know the card model either. It's just a white blank card. Sorry.
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Re: Throw CryptoException when signing

Post by mose05 » Mon Oct 31, 2016 11:28 pm

UNKNwYSHSA wrote:Same question.


My colleague gave it to me. I don't know the card model either. It's just a white blank card. Sorry.
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