#include "public_key.h"
#include "x509_parser.h"
-static const
-struct public_key_algorithm *x509_public_key_algorithms[PKEY_ALGO__LAST] = {
- [PKEY_ALGO_DSA] = NULL,
-#if defined(CONFIG_PUBLIC_KEY_ALGO_RSA) || \
- defined(CONFIG_PUBLIC_KEY_ALGO_RSA_MODULE)
- [PKEY_ALGO_RSA] = &RSA_public_key_algorithm,
-#endif
-};
-
/*
- * Check the signature on a certificate using the provided public key
+ * Set up the signature parameters in an X.509 certificate. This involves
+ * digesting the signed data and extracting the signature.
*/
-static int x509_check_signature(const struct public_key *pub,
- const struct x509_certificate *cert)
+int x509_get_sig_params(struct x509_certificate *cert)
{
- struct public_key_signature *sig;
struct crypto_shash *tfm;
struct shash_desc *desc;
size_t digest_size, desc_size;
+ void *digest;
int ret;
pr_devel("==>%s()\n", __func__);
-
+
+ if (cert->sig.rsa.s)
+ return 0;
+
+ cert->sig.rsa.s = mpi_read_raw_data(cert->raw_sig, cert->raw_sig_size);
+ if (!cert->sig.rsa.s)
+ return -ENOMEM;
+ cert->sig.nr_mpi = 1;
+
/* Allocate the hashing algorithm we're going to need and find out how
* big the hash operational data will be.
*/
- tfm = crypto_alloc_shash(pkey_hash_algo[cert->sig_hash_algo], 0, 0);
+ tfm = crypto_alloc_shash(pkey_hash_algo_name[cert->sig.pkey_hash_algo], 0, 0);
if (IS_ERR(tfm))
return (PTR_ERR(tfm) == -ENOENT) ? -ENOPKG : PTR_ERR(tfm);
desc_size = crypto_shash_descsize(tfm) + sizeof(*desc);
digest_size = crypto_shash_digestsize(tfm);
- /* We allocate the hash operational data storage on the end of our
- * context data.
+ /* We allocate the hash operational data storage on the end of the
+ * digest storage space.
*/
ret = -ENOMEM;
- sig = kzalloc(sizeof(*sig) + desc_size + digest_size, GFP_KERNEL);
- if (!sig)
- goto error_no_sig;
+ digest = kzalloc(digest_size + desc_size, GFP_KERNEL);
+ if (!digest)
+ goto error;
- sig->pkey_hash_algo = cert->sig_hash_algo;
- sig->digest = (u8 *)sig + sizeof(*sig) + desc_size;
- sig->digest_size = digest_size;
+ cert->sig.digest = digest;
+ cert->sig.digest_size = digest_size;
- desc = (void *)sig + sizeof(*sig);
- desc->tfm = tfm;
- desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
+ desc = digest + digest_size;
+ desc->tfm = tfm;
+ desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
ret = crypto_shash_init(desc);
if (ret < 0)
goto error;
+ might_sleep();
+ ret = crypto_shash_finup(desc, cert->tbs, cert->tbs_size, digest);
+error:
+ crypto_free_shash(tfm);
+ pr_devel("<==%s() = %d\n", __func__, ret);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(x509_get_sig_params);
- ret = -ENOMEM;
- sig->rsa.s = mpi_read_raw_data(cert->sig, cert->sig_size);
- if (!sig->rsa.s)
- goto error;
+/*
+ * Check the signature on a certificate using the provided public key
+ */
+int x509_check_signature(const struct public_key *pub,
+ struct x509_certificate *cert)
+{
+ int ret;
- ret = crypto_shash_finup(desc, cert->tbs, cert->tbs_size, sig->digest);
- if (ret < 0)
- goto error_mpi;
+ pr_devel("==>%s()\n", __func__);
- ret = pub->algo->verify_signature(pub, sig);
+ ret = x509_get_sig_params(cert);
+ if (ret < 0)
+ return ret;
+ ret = public_key_verify_signature(pub, &cert->sig);
pr_debug("Cert Verification: %d\n", ret);
-
-error_mpi:
- mpi_free(sig->rsa.s);
-error:
- kfree(sig);
-error_no_sig:
- crypto_free_shash(tfm);
-
- pr_devel("<==%s() = %d\n", __func__, ret);
return ret;
}
+EXPORT_SYMBOL_GPL(x509_check_signature);
/*
* Attempt to parse a data blob for a key as an X509 certificate.
pr_devel("Cert Issuer: %s\n", cert->issuer);
pr_devel("Cert Subject: %s\n", cert->subject);
- pr_devel("Cert Key Algo: %s\n", pkey_algo[cert->pkey_algo]);
+ pr_devel("Cert Key Algo: %s\n", pkey_algo_name[cert->pub->pkey_algo]);
pr_devel("Cert Valid From: %04ld-%02d-%02d %02d:%02d:%02d\n",
cert->valid_from.tm_year + 1900, cert->valid_from.tm_mon + 1,
cert->valid_from.tm_mday, cert->valid_from.tm_hour,
cert->valid_to.tm_mday, cert->valid_to.tm_hour,
cert->valid_to.tm_min, cert->valid_to.tm_sec);
pr_devel("Cert Signature: %s + %s\n",
- pkey_algo[cert->sig_pkey_algo],
- pkey_hash_algo[cert->sig_hash_algo]);
+ pkey_algo_name[cert->sig.pkey_algo],
+ pkey_hash_algo_name[cert->sig.pkey_hash_algo]);
if (!cert->fingerprint || !cert->authority) {
pr_warn("Cert for '%s' must have SubjKeyId and AuthKeyId extensions\n",
goto error_free_cert;
}
- cert->pub->algo = x509_public_key_algorithms[cert->pkey_algo];
+ cert->pub->algo = pkey_algo[cert->pub->pkey_algo];
cert->pub->id_type = PKEY_ID_X509;
/* Check the signature on the key */