Method: OpenSSL::PKey::DSA#initialize

Defined in:
ossl_pkey_dsa.c

#new ⇒ Object #new(string[, pass]) ⇒ Object #new(size) ⇒ Object

Creates a new DSA instance by reading an existing key from string.

If called without arguments, creates a new instance with no key components set. They can be set individually by #set_pqg and #set_key.

If called with a String, tries to parse as DER or PEM encoding of a DSA key. See also OpenSSL::PKey.read which can parse keys of any kinds.

If called with a number, generates random parameters and a key pair. This form works as an alias of DSA.generate.

string

A String that contains a DER or PEM encoded key.

pass

A String that contains an optional password.

size

See DSA.generate.

Examples:

p OpenSSL::PKey::DSA.new(1024)
#=> #<OpenSSL::PKey::DSA:0x000055a8d6025bf0 oid=DSA>

p OpenSSL::PKey::DSA.new(File.read('dsa.pem'))
#=> #<OpenSSL::PKey::DSA:0x000055555d6b8110 oid=DSA>

p OpenSSL::PKey::DSA.new(File.read('dsa.pem'), 'mypassword')
#=> #<OpenSSL::PKey::DSA:0x0000556f973c40b8 oid=DSA>



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# File 'ossl_pkey_dsa.c', line 83

static VALUE
ossl_dsa_initialize(int argc, VALUE *argv, VALUE self)
{
    EVP_PKEY *pkey;
    DSA *dsa;
    BIO *in = NULL;
    VALUE arg, pass;
    int type;

    TypedData_Get_Struct(self, EVP_PKEY, &ossl_evp_pkey_type, pkey);
    if (pkey)
        rb_raise(rb_eTypeError, "pkey already initialized");

    /* The DSA.new(size, generator) form is handled by lib/openssl/pkey.rb */
    rb_scan_args(argc, argv, "02", &arg, &pass);
    if (argc == 0) {
        dsa = DSA_new();
        if (!dsa)
            ossl_raise(eDSAError, "DSA_new");
        goto legacy;
    }

    pass = ossl_pem_passwd_value(pass);
    arg = ossl_to_der_if_possible(arg);
    in = ossl_obj2bio(&arg);

    /* DER-encoded DSAPublicKey format isn't supported by the generic routine */
    dsa = (DSA *)PEM_ASN1_read_bio((d2i_of_void *)d2i_DSAPublicKey,
                                   PEM_STRING_DSA_PUBLIC,
                                   in, NULL, NULL, NULL);
    if (dsa)
        goto legacy;
    OSSL_BIO_reset(in);

    pkey = ossl_pkey_read_generic(in, pass);
    BIO_free(in);
    if (!pkey)
        ossl_raise(eDSAError, "Neither PUB key nor PRIV key");

    type = EVP_PKEY_base_id(pkey);
    if (type != EVP_PKEY_DSA) {
        EVP_PKEY_free(pkey);
        rb_raise(eDSAError, "incorrect pkey type: %s", OBJ_nid2sn(type));
    }
    RTYPEDDATA_DATA(self) = pkey;
    return self;

  legacy:
    BIO_free(in);
    pkey = EVP_PKEY_new();
    if (!pkey || EVP_PKEY_assign_DSA(pkey, dsa) != 1) {
        EVP_PKEY_free(pkey);
        DSA_free(dsa);
        ossl_raise(eDSAError, "EVP_PKEY_assign_DSA");
    }
    RTYPEDDATA_DATA(self) = pkey;
    return self;
}