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Since your problem is the signature size, I recommend you consider elliptic curve signatures instead of trying to roll your own RSASSA implementation. With RSA a 512-bit signature requires you to use a 512-bit modulus, which has been considered insecure for more than a decade. It's equivalent to something like 50-80 bit security at best. These days the ...


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References Related to your reference request: SHA512withRSA points to the RSA Signature Scheme with Appendix based on PKCS #1 v1.5 with SHA-512 hash function. This means you’re looking for reference documentation describing RSA PKCS1 v1.5 (see: RFC2313) signatures with SHA512 (see: RFC6234) hash and X.509 encoding format. Removing “overhead” from code As ...



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