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crypto: rsa - unimplement sign/verify for raw RSA backends

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In preparation for new akcipher verify call remove sign/verify callbacks
from RSA backends and make PKCS1 driver call encrypt/decrypt instead.

This also complies with the well-known idea that raw RSA should never be
used for sign/verify. It only should be used with proper padding scheme
such as PKCS1 driver provides.

Cc: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Cc: qat-linux@intel.com
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Gary Hook <gary.hook@amd.com>
Cc: Horia Geantă <horia.geanta@nxp.com>
Cc: Aymen Sghaier <aymen.sghaier@nxp.com>
Signed-off-by: Vitaly Chikunov <vt@altlinux.org>
Reviewed-by: Horia Geantă <horia.geanta@nxp.com>
Acked-by: Gary R Hook <gary.hook@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Vitaly Chikunov
2019-04-11 18:51:14 +03:00
committed by Herbert Xu
parent 78a0324f4a
commit 3ecc972599
5 changed files with 2 additions and 117 deletions
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109
crypto/rsa.c
View File

@@ -50,34 +50,6 @@ static int _rsa_dec(const struct rsa_mpi_key *key, MPI m, MPI c)
return mpi_powm(m, c, key->d, key->n);
}
/*
* RSASP1 function [RFC3447 sec 5.2.1]
* s = m^d mod n
*/
static int _rsa_sign(const struct rsa_mpi_key *key, MPI s, MPI m)
{
/* (1) Validate 0 <= m < n */
if (mpi_cmp_ui(m, 0) < 0 || mpi_cmp(m, key->n) >= 0)
return -EINVAL;
/* (2) s = m^d mod n */
return mpi_powm(s, m, key->d, key->n);
}
/*
* RSAVP1 function [RFC3447 sec 5.2.2]
* m = s^e mod n;
*/
static int _rsa_verify(const struct rsa_mpi_key *key, MPI m, MPI s)
{
/* (1) Validate 0 <= s < n */
if (mpi_cmp_ui(s, 0) < 0 || mpi_cmp(s, key->n) >= 0)
return -EINVAL;
/* (2) m = s^e mod n */
return mpi_powm(m, s, key->e, key->n);
}
static inline struct rsa_mpi_key *rsa_get_key(struct crypto_akcipher *tfm)
{
return akcipher_tfm_ctx(tfm);
@@ -160,85 +132,6 @@ err_free_m:
return ret;
}
static int rsa_sign(struct akcipher_request *req)
{
struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
const struct rsa_mpi_key *pkey = rsa_get_key(tfm);
MPI m, s = mpi_alloc(0);
int ret = 0;
int sign;
if (!s)
return -ENOMEM;
if (unlikely(!pkey->n || !pkey->d)) {
ret = -EINVAL;
goto err_free_s;
}
ret = -ENOMEM;
m = mpi_read_raw_from_sgl(req->src, req->src_len);
if (!m)
goto err_free_s;
ret = _rsa_sign(pkey, s, m);
if (ret)
goto err_free_m;
ret = mpi_write_to_sgl(s, req->dst, req->dst_len, &sign);
if (ret)
goto err_free_m;
if (sign < 0)
ret = -EBADMSG;
err_free_m:
mpi_free(m);
err_free_s:
mpi_free(s);
return ret;
}
static int rsa_verify(struct akcipher_request *req)
{
struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
const struct rsa_mpi_key *pkey = rsa_get_key(tfm);
MPI s, m = mpi_alloc(0);
int ret = 0;
int sign;
if (!m)
return -ENOMEM;
if (unlikely(!pkey->n || !pkey->e)) {
ret = -EINVAL;
goto err_free_m;
}
s = mpi_read_raw_from_sgl(req->src, req->src_len);
if (!s) {
ret = -ENOMEM;
goto err_free_m;
}
ret = _rsa_verify(pkey, m, s);
if (ret)
goto err_free_s;
ret = mpi_write_to_sgl(m, req->dst, req->dst_len, &sign);
if (ret)
goto err_free_s;
if (sign < 0)
ret = -EBADMSG;
err_free_s:
mpi_free(s);
err_free_m:
mpi_free(m);
return ret;
}
static void rsa_free_mpi_key(struct rsa_mpi_key *key)
{
mpi_free(key->d);
@@ -353,8 +246,6 @@ static void rsa_exit_tfm(struct crypto_akcipher *tfm)
static struct akcipher_alg rsa = {
.encrypt = rsa_enc,
.decrypt = rsa_dec,
.sign = rsa_sign,
.verify = rsa_verify,
.set_priv_key = rsa_set_priv_key,
.set_pub_key = rsa_set_pub_key,
.max_size = rsa_max_size,