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instance method

OpenSSL::PKey::DSA#sysverify

dsa.sysverify(digest, sig) → true | false

ext/openssl/ossl_pkey_dsa.c View on GitHub ↗

static VALUE
ossl_dsa_verify(VALUE self, VALUE digest, VALUE sig)
{
    DSA *dsa;
    int ret;

    GetDSA(self, dsa);
    StringValue(digest);
    StringValue(sig);
    /* type is ignored (0) */
    ret = DSA_verify(0, (unsigned char *)RSTRING_PTR(digest), RSTRING_LENINT(digest),
                     (unsigned char *)RSTRING_PTR(sig), RSTRING_LENINT(sig), dsa);
    if (ret < 0) {
        ossl_raise(eDSAError, NULL);
    }
    else if (ret == 1) {
        return Qtrue;
    }

    return Qfalse;
}

Verifies whether the signature is valid given the message digest input. It does so by validating sig using the public key of this DSA instance.

Parameters

digest is a message digest of the original input data to be signed
sig is a DSA signature value

Example

dsa = OpenSSL::PKey::DSA.new(2048)
doc = "Sign me"
digest = OpenSSL::Digest.digest('SHA1', doc)
sig = dsa.syssign(digest)
puts dsa.sysverify(digest, sig) # => true

See also #syssign #to_der #set_pqg #to_pem also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.1

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