krb5_gss_pseudo_random(OM_uint32 *minor_status,
                       gss_ctx_id_t context,
                       int prf_key,
                       const gss_buffer_t prf_in,
                       ssize_t desired_output_len,
                       gss_buffer_t prf_out)
{
    krb5_error_code code;
    krb5_key key = NULL;
    krb5_gss_ctx_id_t ctx;
    int i;
    OM_uint32 minor;
    size_t prflen;
    krb5_data t, ns;
    unsigned char *p;

    prf_out->length = 0;
    prf_out->value = NULL;

    t.length = 0;
    t.data = NULL;

    ns.length = 0;
     ns.data = NULL;
 
     ctx = (krb5_gss_ctx_id_t)context;
    if (ctx->terminated || !ctx->established) {
        *minor_status = KG_CTX_INCOMPLETE;
        return GSS_S_NO_CONTEXT;
    }
 
     switch (prf_key) {
     case GSS_C_PRF_KEY_FULL:
        if (ctx->have_acceptor_subkey) {
            key = ctx->acceptor_subkey;
            break;
        }
        /* fallthrough */
    case GSS_C_PRF_KEY_PARTIAL:
        key = ctx->subkey;
        break;
    default:
        code = EINVAL;
        goto cleanup;
    }

    if (key == NULL) {
        code = EINVAL;
        goto cleanup;
    }

    if (desired_output_len == 0)
        return GSS_S_COMPLETE;

    prf_out->value = k5alloc(desired_output_len, &code);
    if (prf_out->value == NULL) {
        code = KG_INPUT_TOO_LONG;
        goto cleanup;
    }
    prf_out->length = desired_output_len;

    code = krb5_c_prf_length(ctx->k5_context,
                             krb5_k_key_enctype(ctx->k5_context, key),
                             &prflen);
    if (code != 0)
        goto cleanup;

    ns.length = 4 + prf_in->length;
    ns.data = k5alloc(ns.length, &code);
    if (ns.data == NULL) {
        code = KG_INPUT_TOO_LONG;
        goto cleanup;
    }

    t.length = prflen;
    t.data = k5alloc(t.length, &code);
    if (t.data == NULL)
        goto cleanup;

    memcpy(ns.data + 4, prf_in->value, prf_in->length);
    i = 0;
    p = (unsigned char *)prf_out->value;
    while (desired_output_len > 0) {
        store_32_be(i, ns.data);

        code = krb5_k_prf(ctx->k5_context, key, &ns, &t);
        if (code != 0)
            goto cleanup;

        memcpy(p, t.data, MIN(t.length, desired_output_len));

        p += t.length;
        desired_output_len -= t.length;
        i++;
    }

cleanup:
    if (code != 0)
        gss_release_buffer(&minor, prf_out);
    krb5_free_data_contents(ctx->k5_context, &ns);
    krb5_free_data_contents(ctx->k5_context, &t);

    *minor_status = (OM_uint32)code;
    return (code == 0) ? GSS_S_COMPLETE : GSS_S_FAILURE;
}

Unknown