On Wednesday, July 18, 2018 at 12:45:45 AM UTC-4, 王祥 wrote: > > Hi all, > I found that the default format is P1363. > Since I am signing the message using crypto++ ecdsa, and verify the > signature with Go, I need to change the signature format from P1363 to DER. > > I referred to the document > https://www.codeproject.com/Articles/25590/Cryptographic-Interoperability-Digital-Signatures > > However, the length below is 0, does anybody know if there is something > wrong? > // Determine size of required buffer > auto length = DSAConvertSignatureFormat(NULL, 0, DSA_DER, > (byte*)signatureP1363.c_str(), signatureP1363.size(), > DSA_P1363); >
You should probably show the data in signatureP1363 . It sounds like signatureP1363 is empty. Jeff -- You received this message because you are subscribed to "Crypto++ Users". More information about Crypto++ and this group is available at http://www.cryptopp.com and http://groups.google.com/forum/#!forum/cryptopp-users. --- You received this message because you are subscribed to the Google Groups "Crypto++ Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to cryptopp-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
