Exemple #1
0
static int caam_rsa_set_priv_key(struct crypto_akcipher *tfm, const void *key,
				 unsigned int keylen)
{
	struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
	struct rsa_key raw_key = {NULL};
	struct caam_rsa_key *rsa_key = &ctx->key;
	int ret;

	/* Free the old RSA key if any */
	caam_rsa_free_key(rsa_key);

	ret = rsa_parse_priv_key(&raw_key, key, keylen);
	if (ret)
		return ret;

	/* Copy key in DMA zone */
	rsa_key->d = kzalloc(raw_key.d_sz, GFP_DMA | GFP_KERNEL);
	if (!rsa_key->d)
		goto err;

	rsa_key->e = kzalloc(raw_key.e_sz, GFP_DMA | GFP_KERNEL);
	if (!rsa_key->e)
		goto err;

	/*
	 * Skip leading zeros and copy the positive integer to a buffer
	 * allocated in the GFP_DMA | GFP_KERNEL zone. The decryption descriptor
	 * expects a positive integer for the RSA modulus and uses its length as
	 * decryption output length.
	 */
	rsa_key->n = caam_read_raw_data(raw_key.n, &raw_key.n_sz);
	if (!rsa_key->n)
		goto err;

	if (caam_rsa_check_key_length(raw_key.n_sz << 3)) {
		caam_rsa_free_key(rsa_key);
		return -EINVAL;
	}

	rsa_key->d_sz = raw_key.d_sz;
	rsa_key->e_sz = raw_key.e_sz;
	rsa_key->n_sz = raw_key.n_sz;

	memcpy(rsa_key->d, raw_key.d, raw_key.d_sz);
	memcpy(rsa_key->e, raw_key.e, raw_key.e_sz);

	caam_rsa_set_priv_key_form(ctx, &raw_key);

	return 0;

err:
	caam_rsa_free_key(rsa_key);
	return -ENOMEM;
}
Exemple #2
0
static int rsa_set_priv_key(struct crypto_akcipher *tfm, const void *key,
			    unsigned int keylen)
{
	struct rsa_key *pkey = akcipher_tfm_ctx(tfm);
	int ret;

	ret = rsa_parse_priv_key(pkey, key, keylen);
	if (ret)
		return ret;

	if (rsa_check_key_length(mpi_get_size(pkey->n) << 3)) {
		rsa_free_key(pkey);
		ret = -EINVAL;
	}
	return ret;
}