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(Go) 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
// This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. pkey := chilkat.NewPrivateKey() // 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 := pkey.LoadAnyFormatFile("qa_data/rsa/rsaPrivKey_secret.pem","secret") if success != true { fmt.Println(pkey.LastErrorText()) pkey.DisposePrivateKey() return } // Assuming this is an RSA private key.. rsa := chilkat.NewRsa() // Import the private key into the RSA object: success = rsa.ImportPrivateKeyObj(pkey) if success != true { fmt.Println(rsa.LastErrorText()) pkey.DisposePrivateKey() rsa.DisposeRsa() return } // OpenSSL uses big-endian. rsa.SetLittleEndian(false) // SHA1 hash and sign, and return base64. rsa.SetEncodingMode("base64") b64sig := rsa.SignStringENC("2018-05-18,2018-05-18T11:22:19;FAC 001/18;53.00;","sha1") fmt.Println(*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. pkey.DisposePrivateKey() rsa.DisposeRsa() |
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