finish(p1 = v1) private

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static VALUE
ossl_digest_finish(int argc, VALUE *argv, VALUE self)
    EVP_MD_CTX *ctx;
    VALUE str;
    int out_len;

    GetDigest(self, ctx);
    rb_scan_args(argc, argv, "01", &str);
    out_len = EVP_MD_CTX_size(ctx);

    if (NIL_P(str)) {
        str = rb_str_new(NULL, out_len);
    } else {
        rb_str_resize(str, out_len);

    if (!EVP_DigestFinal_ex(ctx, (unsigned char *)RSTRING_PTR(str), NULL))
        ossl_raise(eDigestError, "EVP_DigestFinal_ex");

    return str;
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