ChecksumCreator

Implements checksum functions.

GenerateChecksum

ChecksumCreator.GenerateChecksum(input, inputType, checksumAlgorithm)

• Input input: VarChar(256), the string to calculate the checksum or the path to a file if LOCAL_FILE domain is used
• Input inputType: InputType Domain value
• Input checksumAlgorithm: ChecksumAlgorithm Domain value
• Returns VarChar(256) hexadecimal

Calculates the checksum value with the given parameters.

The LOCAL_FILE domain is available since GeneXus 17 upgrade 4

Example1: &checksum = &ChecksumCreator.GenerateChecksum("123456789", InputType.ASCII, ChecksumAlgorithm.CRC8)
Example2: &checksum = &ChecksumCreator.GenerateChecksum("123456789", InputType.TXT, ChecksumAlgorithm.CRC8)
Example3: &checksum = &ChecksumCreator.GenerateChecksum("MTIzNDU2Nzg5", InputType.BASE64, ChecksumAlgorithm.CRC8)
Example4: &checksum = &ChecksumCreator.GenerateChecksum("313233343536373839", InputType.HEX, ChecksumAlgorithm.CRC8)
Example5: &checksum = &ChecksumCreator.GenerateChecksum("C:\temp\file.txt", InputType.LOCAL_FILE, ChecksumAlgorithm.CRC8)

VerifyChecksum

ChecksumCreator.VerifyChecksum(input, inputType, checksumAlgorithm, checksum)

• Input input: VarChar(256) the string to calculate the checksum or the path to a file if LOCAL_FILE domain is used
• Input inputType: InputType Domain value
• Input checksumAlgorithm: ChecksumAlgorithm Domain value
• Input checksum: VarChar(256) hexadecimal
• Returns Boolean true if the checksum is correct

The LOCAL_FILE domain is available since GeneXus 17 upgrade 4

Verifies if the checksum is correct for the input with the given parameters.

Example1: &verification = &ChecksumCreator.VerifyChecksum("123456789", InputType.ASCII, ChecksumAlgorithm.CRC8, "F4")
Example2: &verification = &ChecksumCreator.VerifyChecksum("123456789", InputType.TXT, ChecksumAlgorithm.CRC8, "F4")
Example3: &verification = &ChecksumCreator.VerifyChecksum("MTIzNDU2Nzg5", InputType.BASE64, ChecksumAlgorithm.CRC8, "F4")
Example4: &verification = &ChecksumCreator.VerifyChecksum("313233343536373839", InputType.HEX, ChecksumAlgorithm.CRC8, "F4")
Example5: &ChecksumCreator.VerifyChecksum("C:\temp\file.txt", InputType.LOCAL_FILE, ChecksumAlgorithm.CRC8, "F4")

Security tips

• Avoid letting the end-user manipulate the path to the file or sanitize it accordingly, the application won't sanitize the path by default.
• Avoid letting the end-user manipulate files of the server file system. Check for mime types, extensions and verify/sanitize upload paths.