int
CA_STEP5_derive_keys(const EAC_CTX *ctx, const BUF_MEM *pub,
BUF_MEM **nonce, BUF_MEM **token)
{
BUF_MEM *r = NULL;
BUF_MEM *authentication_token = NULL;
check((ctx && ctx->ca_ctx && ctx->ca_ctx->ka_ctx && nonce && token),
"Invalid arguments");
/* Generate nonce and derive k_mac and k_enc*/
r = randb(CA_NONCE_SIZE);
if (!r || !KA_CTX_derive_keys(ctx->ca_ctx->ka_ctx, r, ctx->md_ctx))
goto err;
/* Compute authentication token */
authentication_token = get_authentication_token(ctx->ca_ctx->protocol,
ctx->ca_ctx->ka_ctx, ctx->bn_ctx, ctx->tr_version,
pub);
check(authentication_token, "Failed to compute authentication token");
*nonce = r;
*token = authentication_token;
return 1;
err:
BUF_MEM_clear_free(r);
return 0;
}
BUF_MEM *
PACE_STEP3D_compute_authentication_token(const EAC_CTX *ctx, const BUF_MEM *pub)
{
if (!ctx || !ctx->pace_ctx) {
log_err("Invalid arguments");
return NULL;
}
return get_authentication_token(ctx->pace_ctx->protocol,
ctx->pace_ctx->ka_ctx, ctx->bn_ctx,
ctx->tr_version, pub);
}
