IO::Socket::SSL::Utils(3)

NAME
IO::Socket::SSL::Utils -- loading, storing, creating certificates and keys

SYNOPSIS
    use IO::Socket::SSL::Utils;
    my $cert = PEM_file2cert('cert.pem');
    my $string = PEM_cert2string($cert);
    CERT_free($cert);

    my $key = KEY_create_rsa(2048);
    PEM_string2file($key);
    KEY_free($key);

DESCRIPTION
This module provides various utility functions to work with certificates and private keys, shielding some of the complexity of the underlying Net::SSLeay and OpenSSL.

FUNCTIONS

•   Functions converting between string or file and certificates and keys. They croak if the operation cannot be completed.

    PEM_file2cert(file) -> cert
    PEM_cert2file(cert,file)
    PEM_string2cert(string) -> cert
    PEM_cert2string(cert) -> string
    PEM_file2key(file) -> key
    PEM_key2file(key,file)
    PEM_string2key(string) -> key
    PEM_key2string(key) -> string
•   Functions for cleaning up. Each loaded or created cert and key must be freed to not leak memory.

    CERT_free(cert)
    KEY_free(key)
•   KEY_create_rsa(bits) -> key

    Creates an RSA key pair, bits defaults to 2048.

•   CERT_asHash(cert,[digest_algo]) -> hash

    Extracts the information from the certificate into a hash and uses the given digest_algo (default: SHA-256) to determine digest of pubkey and cert. The resulting hash contains:

    subject
        Hash with the parts of the subject, e.g. commonName, countryName, organizationName, stateOrProvinceName, localityName.

    subjectAltNames
        Array with list of alternative names. Each entry in the list is of "[type,value]", where "type" can be OTHERNAME, EMAIL, DNS, X400, DIRNAME, EDIPARTY, URI, IP or RID.

    issuer
        Hash with the parts of the issuer, e.g. commonName, countryName, organizationName, stateOrProvinceName, localityName.

    not_before, not_after
        The time frame, where the certificate is valid, as time_t, e.g. can be converted with localtime or similar functions.

    serial
        The serial number

    crl_uri
        List of URIs for CRL distribution.

    ocsp_uri
        List of URIs for revocation checking using OCSP.

    keyusage
        List of keyUsage information in the certificate.

    extkeyusage
        List of extended key usage information from the certificate. Each entry in this list consists of a hash with oid, nid, ln and sn.

    pubkey_digest_xxx
        Binary digest of the pubkey using the given digest algorithm, e.g. pubkey_digest_sha256 if (the default) SHA-256 was used.

    x509_digest_xxx
        Binary digest of the X.509 certificate using the given digest algorithm, e.g. x509_digest_sha256 if (the default) SHA-256 was used.

    fingerprint_xxx
        Fingerprint of the certificate using the given digest algorithm, e.g. fingerprint_sha256 if (the default) SHA-256 was used. Contrary to digest_* this is an ASCII string with a list if hexadecimal numbers, e.g. "73:59:75:5C:6D...".

    ext List of extensions. Each entry in the list is a hash with oid, nid, sn, critical flag (boolean) and data (string representation given by X509V3_EXT_print).

    version
        Certificate version, usually 2 (x509v3)

•   CERT_create(hash) -> (cert,key)

    Creates a certificate based on the given hash. If the issuer is not specified the certificate will be self-signed. The following keys can be given:

    subject
        Hash with the parts of the subject, e.g. commonName, countryName, ... as described in "CERT_asHash". Default points to IO::Socket::SSL.

    not_before
        A time_t value when the certificate starts to be valid. Defaults to current time.

    not_after
        A time_t value when the certificate ends to be valid. Defaults to current time plus one 365 days.

    serial
        The serial number. If not given a random number will be used.

    version
        The version of the certificate, default 2 (x509v3).

    CA true|false
        if true declare certificate as CA, defaults to false

    ext [{ sn => .., data => ... }, ... ]
        List of extensions. The type of the extension can be specified as name with "sn" or as NID with "nid" and the data with "data". These data must be in the same syntax as expected within openssl.cnf, e.g. something like "OCSP;URI=http://...". Additionally the critical flag can be set with "critical =" 1>.

    key key
        use given key as key for certificate, otherwise a new one will be generated and returned

    issuer_cert cert
        set issuer for new certificate

    issuer_key key
        sign new certificate with given key

    issuer [ cert, key ]
        Instead of giving issuer_key and issuer_cert as separate arguments they can be given both together.

    digest algorithm
        specify the algorithm used to sign the certificate, default SHA-256.

AUTHOR
Steffen Ullrich