Digital Signature Algorithm (DSA)

DSA is an algorithm for asymmetric key cryptography, defined as a United States Federal Government standard for digital signatures.

Supported DSA Algorithms
Algorithm	Meaning
`DSA_SHA1`	Digital Signature Algorithm with SHA-1 hash function
`DSA_SHA224`	Digital Signature Algorithm with SHA-224 hash function
`DSA_SHA256`	Digital Signature Algorithm with SHA-256 hash function
`DSA_SHA384`	Digital Signature Algorithm with SHA-384 hash function
`DSA_SHA512`	Digital Signature Algorithm with SHA-512 hash function

Signing Messages

Sign a message by DSA with SHA-256 hash:

vSignature = ""
vMessage = "This is scret data."
vSignature = $encode("DSA_SHA256", vMessage, vMyPrivateKey)

Verifying Messages

Verify the signed message:

if ($decode("DSA_SHA256", vMessage, vMyPublicKey, vSignature))
    message/info "This is a valid message."
else
    message/info "Signature doesn’t match with the message."
endif