calc-signature()

string calc-signature(string data, string private_key [, string passphrase [, string algorithm]])

The calc-signature function calculates a signature from the given input using the given private_key (in PEM format, with or without boundaries). The optional parameter passphrase is the pass phrase for decrypting an encrypted private key (the default is the empty string). The optional parameter algorithm is the signing algorithm (the default is SHA256). The resulting signature is Base64-encoded.

See Private Key Format for the supported private key format.

Supported Algorithms

• DSA

• DSA-SHA

• MD2

• MD4

• MD5

• RIPEMD160

• SHA

• SHA1

• SHA224

• SHA256

• SHA384

• SHA512

• dsaEncryption

• dsaWithSHA

• ecdsa-with-SHA1

• md2

• md4

• md5

• ripemd160

• sha

• sha1

• sha224

• sha256

• sha384

• sha512

Example

<flow>
  <template>
  {
    {{$data := 'my data' }}
    {{$private_key := 'MIIEvwIBADANBgkqhkiG9w0BA…WygYMAMY8YaiAGwLtBsjrh7S12agaEQg=='}}
    {{$signature := calc-signature($data, $env/MY_PRIVATE_KEY) }}
    {{$signature := calc-signature($data, $private_key, "", "SHA384") }}
    {{$signature := calc-signature($data, $env/MY_ENCRYPTED_PRIVATE_KEY, $env/MY_PASSPHRASE) }}
    {{$signature := calc-signature($data, $env/MY_ENCRYPTED_KEY, $env/MY_PASSPHRASE, 'SHA512') }}
  }
  </template>
<flow>

See also

• verify-signature()