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(Unicode C) Create a Hash Signature for Value Added Tax Audit SOAP Message for AngolaDemonstrates how to create a hash signature that is required in Value Added Tax Audit Files in Angola, Africa. It is the following two instructions that should be used to create a hash value to be put into a <hash></hash> field in SOAP XML file containing the tax data for the VAT authorities: openssl dgst -shal -sign private.pem -outRegisto1.shal Registo1.txt then openssl enc -base64 - in Registo1.shal -out Registo1.b64 -A
#include <C_CkPrivateKeyW.h> #include <C_CkRsaW.h> void ChilkatSample(void) { HCkPrivateKeyW pkey; BOOL success; HCkRsaW rsa; const wchar_t *b64sig; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. pkey = CkPrivateKeyW_Create(); // Load the private key from an PEM file. // Provide the password in the 2nd argument. // If no password is needed, just pass an empty string. success = CkPrivateKeyW_LoadAnyFormatFile(pkey,L"qa_data/rsa/rsaPrivKey_secret.pem",L"secret"); if (success != TRUE) { wprintf(L"%s\n",CkPrivateKeyW_lastErrorText(pkey)); CkPrivateKeyW_Dispose(pkey); return; } // Assuming this is an RSA private key.. rsa = CkRsaW_Create(); // Import the private key into the RSA object: success = CkRsaW_ImportPrivateKeyObj(rsa,pkey); if (success != TRUE) { wprintf(L"%s\n",CkRsaW_lastErrorText(rsa)); CkPrivateKeyW_Dispose(pkey); CkRsaW_Dispose(rsa); return; } // OpenSSL uses big-endian. CkRsaW_putLittleEndian(rsa,FALSE); // SHA1 hash and sign, and return base64. CkRsaW_putEncodingMode(rsa,L"base64"); b64sig = CkRsaW_signStringENC(rsa,L"2018-05-18,2018-05-18T11:22:19;FAC 001/18;53.00;",L"sha1"); wprintf(L"%s\n",b64sig); // The signature is equal in size to your private key. For example, if you have a 1024-bit RSA key, // then 1024 bits = 128 bytes. When 128 bytes is base64 encoded, the result is a string approximately // 4/3rds the size of the original. 128 * 4 / 3 = (approximately) 172 bytes. // If your RSA key is 2048-bits, then your signature will be twice as long. CkPrivateKeyW_Dispose(pkey); CkRsaW_Dispose(rsa); } |
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