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A Simple Public Key Infrastructure implementation (pronounced “spooky”). The structure is defined as

PublicKeyAndChallenge ::= SEQUENCE {
  spki SubjectPublicKeyInfo,
  challenge IA5STRING
}

SignedPublicKeyAndChallenge ::= SEQUENCE {
  publicKeyAndChallenge PublicKeyAndChallenge,
  signatureAlgorithm AlgorithmIdentifier,
  signature BIT STRING
}

where the definitions of SubjectPublicKeyInfo and AlgorithmIdentifier can be found in RFC5280. SPKI is typically used in browsers for generating a public/private key pair and a subsequent certificate request, using the HTML <keygen> element.

Examples

Creating an SPKI

key = OpenSSL::PKey::RSA.new 2048
spki = OpenSSL::Netscape::SPKI.new
spki.challenge = "RandomChallenge"
spki.public_key = key.public_key
spki.sign(key, OpenSSL::Digest.new('SHA256'))
#send a request containing this to a server generating a certificate

Verifying an SPKI request

request = #...
spki = OpenSSL::Netscape::SPKI.new request
unless spki.verify(spki.public_key)
  # signature is invalid
end
#proceed
Methods
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Class Public methods

SPKI.new([request]) => spki

Parameters

  • request - optional raw request, either in PEM or DER format.

Source: show 

static VALUE
ossl_spki_initialize(int argc, VALUE *argv, VALUE self)
{
    NETSCAPE_SPKI *spki;
    VALUE buffer;
    const unsigned char *p;

    if (rb_scan_args(argc, argv, "01", &buffer) == 0) {
        return self;
    }
    StringValue(buffer);
    if (!(spki = NETSCAPE_SPKI_b64_decode(RSTRING_PTR(buffer), RSTRING_LENINT(buffer)))) {
        ossl_clear_error();
        p = (unsigned char *)RSTRING_PTR(buffer);
        if (!(spki = d2i_NETSCAPE_SPKI(NULL, &p, RSTRING_LEN(buffer)))) {
            ossl_raise(eSPKIError, NULL);
        }
    }
    NETSCAPE_SPKI_free(DATA_PTR(self));
    SetSPKI(self, spki);

    return self;
}

Instance Public methods

spki.challenge => string

Returns the challenge string associated with this SPKI.

Source: show 

static VALUE
ossl_spki_get_challenge(VALUE self)
{
    NETSCAPE_SPKI *spki;

    GetSPKI(self, spki);
    if (spki->spkac->challenge->length <= 0) {
        OSSL_Debug("Challenge.length <= 0?");
        return rb_str_new(0, 0);
    }

    return rb_str_new((const char *)spki->spkac->challenge->data,
                      spki->spkac->challenge->length);
}

spki.challenge = str => string

Parameters

  • str - the challenge string to be set for this instance

Sets the challenge to be associated with the SPKI. May be used by the server, e.g. to prevent replay.

Source: show 

static VALUE
ossl_spki_set_challenge(VALUE self, VALUE str)
{
    NETSCAPE_SPKI *spki;

    StringValue(str);
    GetSPKI(self, spki);
    if (!ASN1_STRING_set(spki->spkac->challenge, RSTRING_PTR(str),
                         RSTRING_LENINT(str))) {
        ossl_raise(eSPKIError, NULL);
    }

    return str;
}

spki.public_key => pkey

Returns the public key associated with the SPKI, an instance of OpenSSL::PKey.

Source: show 

static VALUE
ossl_spki_get_public_key(VALUE self)
{
    NETSCAPE_SPKI *spki;
    EVP_PKEY *pkey;

    GetSPKI(self, spki);
    if (!(pkey = NETSCAPE_SPKI_get_pubkey(spki))) { /* adds an reference */
        ossl_raise(eSPKIError, NULL);
    }

    return ossl_pkey_new(pkey); /* NO DUP - OK */
}

spki.public_key = pub => pkey

Parameters

  • pub - the public key to be set for this instance

Sets the public key to be associated with the SPKI, an instance of OpenSSL::PKey. This should be the public key corresponding to the private key used for signing the SPKI.

Source: show 

static VALUE
ossl_spki_set_public_key(VALUE self, VALUE key)
{
    NETSCAPE_SPKI *spki;
    EVP_PKEY *pkey;

    GetSPKI(self, spki);
    pkey = GetPKeyPtr(key);
    ossl_pkey_check_public_key(pkey);
    if (!NETSCAPE_SPKI_set_pubkey(spki, pkey))
        ossl_raise(eSPKIError, "NETSCAPE_SPKI_set_pubkey");
    return key;
}

spki.sign(key, digest) => spki

Parameters

  • key - the private key to be used for signing this instance

  • digest - the digest to be used for signing this instance

To sign an SPKI, the private key corresponding to the public key set for this instance should be used, in addition to a digest algorithm in the form of an OpenSSL::Digest. The private key should be an instance of OpenSSL::PKey.

Source: show 

static VALUE
ossl_spki_sign(VALUE self, VALUE key, VALUE digest)
{
    NETSCAPE_SPKI *spki;
    EVP_PKEY *pkey;
    const EVP_MD *md;

    pkey = GetPrivPKeyPtr(key); /* NO NEED TO DUP */
    md = ossl_evp_get_digestbyname(digest);
    GetSPKI(self, spki);
    if (!NETSCAPE_SPKI_sign(spki, pkey, md)) {
        ossl_raise(eSPKIError, NULL);
    }

    return self;
}

spki.to_der => DER-encoded string

Returns the DER encoding of this SPKI.

Source: show 

static VALUE
ossl_spki_to_der(VALUE self)
{
    NETSCAPE_SPKI *spki;
    VALUE str;
    long len;
    unsigned char *p;

    GetSPKI(self, spki);
    if ((len = i2d_NETSCAPE_SPKI(spki, NULL)) <= 0)
        ossl_raise(eX509CertError, NULL);
    str = rb_str_new(0, len);
    p = (unsigned char *)RSTRING_PTR(str);
    if (i2d_NETSCAPE_SPKI(spki, &p) <= 0)
        ossl_raise(eX509CertError, NULL);
    ossl_str_adjust(str, p);

    return str;
}

spki.to_pem => PEM-encoded string

Returns the PEM encoding of this SPKI.

Also aliased as: to_s

Source: show 

static VALUE
ossl_spki_to_pem(VALUE self)
{
    NETSCAPE_SPKI *spki;
    char *data;
    VALUE str;

    GetSPKI(self, spki);
    if (!(data = NETSCAPE_SPKI_b64_encode(spki))) {
        ossl_raise(eSPKIError, NULL);
    }
    str = ossl_buf2str(data, rb_long2int(strlen(data)));

    return str;
}

to_s()

Returns the PEM encoding of this SPKI.

Alias for: to_pem

spki.to_text => string

Returns a textual representation of this SPKI, useful for debugging purposes.

Source: show 

static VALUE
ossl_spki_print(VALUE self)
{
    NETSCAPE_SPKI *spki;
    BIO *out;

    GetSPKI(self, spki);
    if (!(out = BIO_new(BIO_s_mem()))) {
        ossl_raise(eSPKIError, NULL);
    }
    if (!NETSCAPE_SPKI_print(out, spki)) {
        BIO_free(out);
        ossl_raise(eSPKIError, NULL);
    }

    return ossl_membio2str(out);
}

spki.verify(key) => boolean

Parameters

  • key - the public key to be used for verifying the SPKI signature

Returns true if the signature is valid, false otherwise. To verify an SPKI, the public key contained within the SPKI should be used.

Source: show 

static VALUE
ossl_spki_verify(VALUE self, VALUE key)
{
    NETSCAPE_SPKI *spki;
    EVP_PKEY *pkey;

    GetSPKI(self, spki);
    pkey = GetPKeyPtr(key);
    ossl_pkey_check_public_key(pkey);
    switch (NETSCAPE_SPKI_verify(spki, pkey)) {
      case 0:
        ossl_clear_error();
        return Qfalse;
      case 1:
        return Qtrue;
      default:
        ossl_raise(eSPKIError, "NETSCAPE_SPKI_verify");
    }
}