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Diffstat (limited to 'crypto/asymmetric_keys/public_key.c')
-rw-r--r--crypto/asymmetric_keys/public_key.c154
1 files changed, 100 insertions, 54 deletions
diff --git a/crypto/asymmetric_keys/public_key.c b/crypto/asymmetric_keys/public_key.c
index 6db4c01c6503..0f8b264b3961 100644
--- a/crypto/asymmetric_keys/public_key.c
+++ b/crypto/asymmetric_keys/public_key.c
@@ -17,32 +17,13 @@
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/seq_file.h>
+#include <linux/scatterlist.h>
#include <keys/asymmetric-subtype.h>
-#include "public_key.h"
+#include <crypto/public_key.h>
+#include <crypto/akcipher.h>
MODULE_LICENSE("GPL");
-const char *const pkey_algo_name[PKEY_ALGO__LAST] = {
- [PKEY_ALGO_DSA] = "DSA",
- [PKEY_ALGO_RSA] = "RSA",
-};
-EXPORT_SYMBOL_GPL(pkey_algo_name);
-
-const struct public_key_algorithm *pkey_algo[PKEY_ALGO__LAST] = {
-#if defined(CONFIG_PUBLIC_KEY_ALGO_RSA) || \
- defined(CONFIG_PUBLIC_KEY_ALGO_RSA_MODULE)
- [PKEY_ALGO_RSA] = &RSA_public_key_algorithm,
-#endif
-};
-EXPORT_SYMBOL_GPL(pkey_algo);
-
-const char *const pkey_id_type_name[PKEY_ID_TYPE__LAST] = {
- [PKEY_ID_PGP] = "PGP",
- [PKEY_ID_X509] = "X509",
- [PKEY_ID_PKCS7] = "PKCS#7",
-};
-EXPORT_SYMBOL_GPL(pkey_id_type_name);
-
/*
* Provide a part of a description of the key for /proc/keys.
*/
@@ -52,8 +33,7 @@ static void public_key_describe(const struct key *asymmetric_key,
struct public_key *key = asymmetric_key->payload.data[asym_crypto];
if (key)
- seq_printf(m, "%s.%s",
- pkey_id_type_name[key->id_type], key->algo->name);
+ seq_printf(m, "%s.%s", key->id_type, key->pkey_algo);
}
/*
@@ -62,50 +42,116 @@ static void public_key_describe(const struct key *asymmetric_key,
void public_key_destroy(void *payload)
{
struct public_key *key = payload;
- int i;
- if (key) {
- for (i = 0; i < ARRAY_SIZE(key->mpi); i++)
- mpi_free(key->mpi[i]);
- kfree(key);
- }
+ if (key)
+ kfree(key->key);
+ kfree(key);
}
EXPORT_SYMBOL_GPL(public_key_destroy);
+struct public_key_completion {
+ struct completion completion;
+ int err;
+};
+
+static void public_key_verify_done(struct crypto_async_request *req, int err)
+{
+ struct public_key_completion *compl = req->data;
+
+ if (err == -EINPROGRESS)
+ return;
+
+ compl->err = err;
+ complete(&compl->completion);
+}
+
/*
* Verify a signature using a public key.
*/
-int public_key_verify_signature(const struct public_key *pk,
+int public_key_verify_signature(const struct public_key *pkey,
const struct public_key_signature *sig)
{
- const struct public_key_algorithm *algo;
-
- BUG_ON(!pk);
- BUG_ON(!pk->mpi[0]);
- BUG_ON(!pk->mpi[1]);
+ struct public_key_completion compl;
+ struct crypto_akcipher *tfm;
+ struct akcipher_request *req;
+ struct scatterlist sig_sg, digest_sg;
+ const char *alg_name;
+ char alg_name_buf[CRYPTO_MAX_ALG_NAME];
+ void *output;
+ unsigned int outlen;
+ int ret = -ENOMEM;
+
+ pr_devel("==>%s()\n", __func__);
+
+ BUG_ON(!pkey);
BUG_ON(!sig);
BUG_ON(!sig->digest);
- BUG_ON(!sig->mpi[0]);
-
- algo = pk->algo;
- if (!algo) {
- if (pk->pkey_algo >= PKEY_ALGO__LAST)
- return -ENOPKG;
- algo = pkey_algo[pk->pkey_algo];
- if (!algo)
- return -ENOPKG;
+ BUG_ON(!sig->s);
+
+ alg_name = sig->pkey_algo;
+ if (strcmp(sig->pkey_algo, "rsa") == 0) {
+ /* The data wangled by the RSA algorithm is typically padded
+ * and encoded in some manner, such as EMSA-PKCS1-1_5 [RFC3447
+ * sec 8.2].
+ */
+ if (snprintf(alg_name_buf, CRYPTO_MAX_ALG_NAME,
+ "pkcs1pad(rsa,%s)", sig->hash_algo
+ ) >= CRYPTO_MAX_ALG_NAME)
+ return -EINVAL;
+ alg_name = alg_name_buf;
}
- if (!algo->verify_signature)
- return -ENOTSUPP;
-
- if (sig->nr_mpi != algo->n_sig_mpi) {
- pr_debug("Signature has %u MPI not %u\n",
- sig->nr_mpi, algo->n_sig_mpi);
- return -EINVAL;
+ tfm = crypto_alloc_akcipher(alg_name, 0, 0);
+ if (IS_ERR(tfm))
+ return PTR_ERR(tfm);
+
+ req = akcipher_request_alloc(tfm, GFP_KERNEL);
+ if (!req)
+ goto error_free_tfm;
+
+ ret = crypto_akcipher_set_pub_key(tfm, pkey->key, pkey->keylen);
+ if (ret)
+ goto error_free_req;
+
+ outlen = crypto_akcipher_maxsize(tfm);
+ output = kmalloc(outlen, GFP_KERNEL);
+ if (!output)
+ goto error_free_req;
+
+ sg_init_one(&sig_sg, sig->s, sig->s_size);
+ sg_init_one(&digest_sg, output, outlen);
+ akcipher_request_set_crypt(req, &sig_sg, &digest_sg, sig->s_size,
+ outlen);
+ init_completion(&compl.completion);
+ akcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG |
+ CRYPTO_TFM_REQ_MAY_SLEEP,
+ public_key_verify_done, &compl);
+
+ /* Perform the verification calculation. This doesn't actually do the
+ * verification, but rather calculates the hash expected by the
+ * signature and returns that to us.
+ */
+ ret = crypto_akcipher_verify(req);
+ if (ret == -EINPROGRESS) {
+ wait_for_completion(&compl.completion);
+ ret = compl.err;
}
-
- return algo->verify_signature(pk, sig);
+ if (ret < 0)
+ goto out_free_output;
+
+ /* Do the actual verification step. */
+ if (req->dst_len != sig->digest_size ||
+ memcmp(sig->digest, output, sig->digest_size) != 0)
+ ret = -EKEYREJECTED;
+
+out_free_output:
+ kfree(output);
+error_free_req:
+ akcipher_request_free(req);
+error_free_tfm:
+ crypto_free_akcipher(tfm);
+ pr_devel("<==%s() = %d\n", __func__, ret);
+ return ret;
}
EXPORT_SYMBOL_GPL(public_key_verify_signature);