Tcl

DSA Generate Key

See more DSA Examples

Generates a DSA public/private key pair and saves to PEM and DER file formats (both encrypted and non-encrypted).

An encrypted DSA PEM looks like this:

-----BEGIN DSA PRIVATE KEY-----
Proc-Type: 4,ENCRYPTED
DEK-Info: DES-EDE3-CBC,9DAFD5C4CD62A5D0

QwDdp66sB0qKXQli7FbVcKL/eo3wu7kGRlV2sI8XbkNa1RTLiwnwTWDB0dqyWRQ8
...
Bx0HVfxKiNgCbL6BQEnYD+GOmMcckuj9Uhgloe/YuXCIDJBGhjUt/li3hvR/PXeC

V2xxNl1XKBE88njqi+UXt4vjGVNLpvXM
-----END DSA PRIVATE KEY-----

Tcl

load ./chilkat.dll

set success 0

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

set dsa [new_CkDsa]

# Call GenKey to generate a new DSA key.
# The number of bits should be at least 1024 and a multiple
# of 64.   Typical values are either 1024 or 2048.
# DSA key generation is compute intensive and may take
# a short while to complete.
set success [CkDsa_GenKey $dsa 2048]
if {$success != 1} then {
    puts [CkDsa_lastErrorText $dsa]
    delete_CkDsa $dsa
    exit
}

# Extract the private and public parts to PEM or DER format
# and save to files...

# First for the public key...
# The public key never needs to be encrypted.

# Save the public key in PEM format:
set pemStr [CkDsa_toPublicPem $dsa]
# This example will not check the return value of SaveText...
set success [CkDsa_SaveText $dsa $pemStr "dsa_pub.pem"]

# Save the public key in DER format:
set success [CkDsa_ToPublicDerFile $dsa "dsa_pub.der"]

set bPublicOnly 1
# Save to XML
set xmlStr [CkDsa_toXml $dsa $bPublicOnly]
set success [CkDsa_SaveText $dsa $xmlStr "dsa_pub.xml"]

# ------------------------------------
# Now for the private key....
# ------------------------------------

# Unencrypted PEM:
set pemStr [CkDsa_toPem $dsa]
set success [CkDsa_SaveText $dsa $pemStr "dsa_priv.pem"]

# Encrypted PEM:
set pemStr [CkDsa_toEncryptedPem $dsa "myPassword"]
set success [CkDsa_SaveText $dsa $pemStr "dsa_privEncrypted.pem"]

# DER:
set success [CkDsa_ToDerFile $dsa "dsa_priv.der"]

# XML:
set bPublicOnly 0
set xmlStr [CkDsa_toXml $dsa $bPublicOnly]
set success [CkDsa_SaveText $dsa $xmlStr "dsa_priv.xml"]

puts "Finished!"

delete_CkDsa $dsa