What is the size of a RSA signature in bytes?

StackOverflow https://stackoverflow.com/questions/2256233

  •  20-09-2019
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Question

I'm currently using Crypto++ to generate a signature for a block of data. I expected the signature to be 20 bytes ( SHA 1 Hash) , as my understanding was that the signature is just an encrypted hash. But when checking with maxsignaturelength and signature length , it seems that it is 192 bytes. Is it normal?

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Solution

The size of the signature is the size of the RSA modulus in bytes.

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