#include <linux/module.h>
#include <linux/random.h>
+/*
+ * Hash algorithm OIDs plus ASN.1 DER wrappings [RFC4880 sec 5.2.2].
+ */
+static const u8 rsa_digest_info_md5[] = {
+ 0x30, 0x20, 0x30, 0x0c, 0x06, 0x08,
+ 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x02, 0x05, /* OID */
+ 0x05, 0x00, 0x04, 0x10
+};
+
+static const u8 rsa_digest_info_sha1[] = {
+ 0x30, 0x21, 0x30, 0x09, 0x06, 0x05,
+ 0x2b, 0x0e, 0x03, 0x02, 0x1a,
+ 0x05, 0x00, 0x04, 0x14
+};
+
+static const u8 rsa_digest_info_rmd160[] = {
+ 0x30, 0x21, 0x30, 0x09, 0x06, 0x05,
+ 0x2b, 0x24, 0x03, 0x02, 0x01,
+ 0x05, 0x00, 0x04, 0x14
+};
+
+static const u8 rsa_digest_info_sha224[] = {
+ 0x30, 0x2d, 0x30, 0x0d, 0x06, 0x09,
+ 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x04,
+ 0x05, 0x00, 0x04, 0x1c
+};
+
+static const u8 rsa_digest_info_sha256[] = {
+ 0x30, 0x31, 0x30, 0x0d, 0x06, 0x09,
+ 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01,
+ 0x05, 0x00, 0x04, 0x20
+};
+
+static const u8 rsa_digest_info_sha384[] = {
+ 0x30, 0x41, 0x30, 0x0d, 0x06, 0x09,
+ 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x02,
+ 0x05, 0x00, 0x04, 0x30
+};
+
+static const u8 rsa_digest_info_sha512[] = {
+ 0x30, 0x51, 0x30, 0x0d, 0x06, 0x09,
+ 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03,
+ 0x05, 0x00, 0x04, 0x40
+};
+
+static const struct rsa_asn1_template {
+ const char *name;
+ const u8 *data;
+ size_t size;
+} rsa_asn1_templates[] = {
+#define _(X) { #X, rsa_digest_info_##X, sizeof(rsa_digest_info_##X) }
+ _(md5),
+ _(sha1),
+ _(rmd160),
+ _(sha256),
+ _(sha384),
+ _(sha512),
+ _(sha224),
+ { NULL }
+#undef _
+};
+
+static const struct rsa_asn1_template *rsa_lookup_asn1(const char *name)
+{
+ const struct rsa_asn1_template *p;
+
+ for (p = rsa_asn1_templates; p->name; p++)
+ if (strcmp(name, p->name) == 0)
+ return p;
+ return NULL;
+}
+
struct pkcs1pad_ctx {
struct crypto_akcipher *child;
-
+ const char *hash_name;
unsigned int key_size;
};
+struct pkcs1pad_inst_ctx {
+ struct crypto_akcipher_spawn spawn;
+ const char *hash_name;
+};
+
struct pkcs1pad_request {
struct akcipher_request child_req;
struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
+ const struct rsa_asn1_template *digest_info = NULL;
int err;
- unsigned int ps_end;
+ unsigned int ps_end, digest_size = 0;
if (!ctx->key_size)
return -EINVAL;
- if (req->src_len > ctx->key_size - 11)
+ if (ctx->hash_name) {
+ digest_info = rsa_lookup_asn1(ctx->hash_name);
+ if (!digest_info)
+ return -EINVAL;
+
+ digest_size = digest_info->size;
+ }
+
+ if (req->src_len + digest_size > ctx->key_size - 11)
return -EOVERFLOW;
if (req->dst_len < ctx->key_size) {
if (!req_ctx->in_buf)
return -ENOMEM;
- ps_end = ctx->key_size - req->src_len - 2;
+ ps_end = ctx->key_size - digest_size - req->src_len - 2;
req_ctx->in_buf[0] = 0x01;
memset(req_ctx->in_buf + 1, 0xff, ps_end - 1);
req_ctx->in_buf[ps_end] = 0x00;
+ if (digest_info) {
+ memcpy(req_ctx->in_buf + ps_end + 1, digest_info->data,
+ digest_info->size);
+ }
+
pkcs1pad_sg_set_buf(req_ctx->in_sg, req_ctx->in_buf,
ctx->key_size - 1 - req->src_len, req->src);
struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
+ const struct rsa_asn1_template *digest_info;
unsigned int pos;
if (err == -EOVERFLOW)
goto done;
}
- if (req_ctx->out_buf[0] != 0x01) {
- err = -EINVAL;
+ err = -EBADMSG;
+ if (req_ctx->out_buf[0] != 0x01)
goto done;
- }
+
for (pos = 1; pos < req_ctx->child_req.dst_len; pos++)
if (req_ctx->out_buf[pos] != 0xff)
break;
+
if (pos < 9 || pos == req_ctx->child_req.dst_len ||
- req_ctx->out_buf[pos] != 0x00) {
- err = -EINVAL;
+ req_ctx->out_buf[pos] != 0x00)
goto done;
- }
pos++;
+ if (ctx->hash_name) {
+ digest_info = rsa_lookup_asn1(ctx->hash_name);
+ if (!digest_info)
+ goto done;
+
+ if (memcmp(req_ctx->out_buf + pos, digest_info->data,
+ digest_info->size))
+ goto done;
+
+ pos += digest_info->size;
+ }
+
+ err = 0;
+
if (req->dst_len < req_ctx->child_req.dst_len - pos)
err = -EOVERFLOW;
req->dst_len = req_ctx->child_req.dst_len - pos;
sg_copy_from_buffer(req->dst,
sg_nents_for_len(req->dst, req->dst_len),
req_ctx->out_buf + pos, req->dst_len);
-
done:
kzfree(req_ctx->out_buf);
struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
int err;
- if (!ctx->key_size || req->src_len != ctx->key_size)
+ if (!ctx->key_size || req->src_len < ctx->key_size)
return -EINVAL;
if (ctx->key_size > PAGE_SIZE)
static int pkcs1pad_init_tfm(struct crypto_akcipher *tfm)
{
struct akcipher_instance *inst = akcipher_alg_instance(tfm);
+ struct pkcs1pad_inst_ctx *ictx = akcipher_instance_ctx(inst);
struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
struct crypto_akcipher *child_tfm;
return PTR_ERR(child_tfm);
ctx->child = child_tfm;
-
+ ctx->hash_name = ictx->hash_name;
return 0;
}
static void pkcs1pad_free(struct akcipher_instance *inst)
{
- struct crypto_akcipher_spawn *spawn = akcipher_instance_ctx(inst);
+ struct pkcs1pad_inst_ctx *ctx = akcipher_instance_ctx(inst);
+ struct crypto_akcipher_spawn *spawn = &ctx->spawn;
crypto_drop_akcipher(spawn);
-
+ kfree(ctx->hash_name);
kfree(inst);
}
{
struct crypto_attr_type *algt;
struct akcipher_instance *inst;
+ struct pkcs1pad_inst_ctx *ctx;
struct crypto_akcipher_spawn *spawn;
struct akcipher_alg *rsa_alg;
const char *rsa_alg_name;
+ const char *hash_name;
int err;
algt = crypto_get_attr_type(tb);
if (IS_ERR(rsa_alg_name))
return PTR_ERR(rsa_alg_name);
- inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
+ hash_name = crypto_attr_alg_name(tb[2]);
+ if (IS_ERR(hash_name))
+ hash_name = NULL;
+
+ inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
if (!inst)
return -ENOMEM;
- spawn = akcipher_instance_ctx(inst);
+ ctx = akcipher_instance_ctx(inst);
+ spawn = &ctx->spawn;
+ ctx->hash_name = hash_name ? kstrdup(hash_name, GFP_KERNEL) : NULL;
+
crypto_set_spawn(&spawn->base, akcipher_crypto_instance(inst));
err = crypto_grab_akcipher(spawn, rsa_alg_name, 0,
crypto_requires_sync(algt->type, algt->mask));
rsa_alg = crypto_spawn_akcipher_alg(spawn);
err = -ENAMETOOLONG;
- if (snprintf(inst->alg.base.cra_name,
- CRYPTO_MAX_ALG_NAME, "pkcs1pad(%s)",
- rsa_alg->base.cra_name) >=
- CRYPTO_MAX_ALG_NAME ||
- snprintf(inst->alg.base.cra_driver_name,
- CRYPTO_MAX_ALG_NAME, "pkcs1pad(%s)",
- rsa_alg->base.cra_driver_name) >=
- CRYPTO_MAX_ALG_NAME)
+
+ if (!hash_name) {
+ if (snprintf(inst->alg.base.cra_name,
+ CRYPTO_MAX_ALG_NAME, "pkcs1pad(%s)",
+ rsa_alg->base.cra_name) >=
+ CRYPTO_MAX_ALG_NAME ||
+ snprintf(inst->alg.base.cra_driver_name,
+ CRYPTO_MAX_ALG_NAME, "pkcs1pad(%s)",
+ rsa_alg->base.cra_driver_name) >=
+ CRYPTO_MAX_ALG_NAME)
goto out_drop_alg;
+ } else {
+ if (snprintf(inst->alg.base.cra_name,
+ CRYPTO_MAX_ALG_NAME, "pkcs1pad(%s,%s)",
+ rsa_alg->base.cra_name, hash_name) >=
+ CRYPTO_MAX_ALG_NAME ||
+ snprintf(inst->alg.base.cra_driver_name,
+ CRYPTO_MAX_ALG_NAME, "pkcs1pad(%s,%s)",
+ rsa_alg->base.cra_driver_name, hash_name) >=
+ CRYPTO_MAX_ALG_NAME)
+ goto out_free_hash;
+ }
inst->alg.base.cra_flags = rsa_alg->base.cra_flags & CRYPTO_ALG_ASYNC;
inst->alg.base.cra_priority = rsa_alg->base.cra_priority;
err = akcipher_register_instance(tmpl, inst);
if (err)
- goto out_drop_alg;
+ goto out_free_hash;
return 0;
+out_free_hash:
+ kfree(ctx->hash_name);
out_drop_alg:
crypto_drop_akcipher(spawn);
out_free_inst:
projects / cascardo / linux.git / blobdiff