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crypto: Support export akcipher to pkcs8

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crypto: support export RSA private keys with PKCS#8 standard.
So that users can upload this private key to linux kernel.

Signed-off-by: lei he <helei.sig11@bytedance.com>
Message-Id: <20221008085030.70212-4-helei.sig11@bytedance.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Lei He 2022-10-08 16:50:29 +08:00 committed by Michael S. Tsirkin
parent 3b34ccad66
commit 58660863ba
4 changed files with 91 additions and 1 deletions
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18
crypto/akcipher.c
View file

@ -22,6 +22,8 @@
#include "qemu/osdep.h"
#include "crypto/akcipher.h"
#include "akcipherpriv.h"
#include "der.h"
#include "rsakey.h"
#if defined(CONFIG_GCRYPT)
#include "akcipher-gcrypt.c.inc"
@ -106,3 +108,19 @@ void qcrypto_akcipher_free(QCryptoAkCipher *akcipher)
drv->free(akcipher);
}
int qcrypto_akcipher_export_p8info(const QCryptoAkCipherOptions *opts,
uint8_t *key, size_t keylen,
uint8_t **dst, size_t *dst_len,
Error **errp)
{
switch (opts->alg) {
case QCRYPTO_AKCIPHER_ALG_RSA:
qcrypto_akcipher_rsakey_export_p8info(key, keylen, dst, dst_len);
return 0;
default:
error_setg(errp, "Unsupported algorithm: %u", opts->alg);
return -1;
}
}

42
crypto/rsakey.c
View file

@ -19,6 +19,8 @@
*
*/
#include "qemu/osdep.h"
#include "der.h"
#include "rsakey.h"
void qcrypto_akcipher_rsakey_free(QCryptoAkCipherRSAKey *rsa_key)
@ -37,6 +39,46 @@ void qcrypto_akcipher_rsakey_free(QCryptoAkCipherRSAKey *rsa_key)
g_free(rsa_key);
}
/**
* PKCS#8 private key info for RSA
*
* PrivateKeyInfo ::= SEQUENCE {
* version INTEGER,
* privateKeyAlgorithm PrivateKeyAlgorithmIdentifier,
* privateKey OCTET STRING,
* attributes [0] IMPLICIT Attributes OPTIONAL
* }
*/
void qcrypto_akcipher_rsakey_export_p8info(const uint8_t *key,
size_t keylen,
uint8_t **dst,
size_t *dlen)
{
QCryptoEncodeContext *ctx = qcrypto_der_encode_ctx_new();
uint8_t version = 0;
qcrypto_der_encode_seq_begin(ctx);
/* version */
qcrypto_der_encode_int(ctx, &version, sizeof(version));
/* algorithm identifier */
qcrypto_der_encode_seq_begin(ctx);
qcrypto_der_encode_oid(ctx, (uint8_t *)QCRYPTO_OID_rsaEncryption,
sizeof(QCRYPTO_OID_rsaEncryption) - 1);
qcrypto_der_encode_null(ctx);
qcrypto_der_encode_seq_end(ctx);
/* RSA private key */
qcrypto_der_encode_octet_str(ctx, key, keylen);
qcrypto_der_encode_seq_end(ctx);
*dlen = qcrypto_der_encode_ctx_buffer_len(ctx);
*dst = g_malloc(*dlen);
qcrypto_der_encode_ctx_flush_and_free(ctx, *dst);
}
#if defined(CONFIG_NETTLE) && defined(CONFIG_HOGWEED)
#include "rsakey-nettle.c.inc"
#else

11
crypto/rsakey.h
View file

@ -22,7 +22,6 @@
#ifndef QCRYPTO_RSAKEY_H
#define QCRYPTO_RSAKEY_H
#include "qemu/osdep.h"
#include "qemu/host-utils.h"
#include "crypto/akcipher.h"
@ -84,6 +83,16 @@ QCryptoAkCipherRSAKey *qcrypto_akcipher_rsakey_parse(
QCryptoAkCipherKeyType type,
const uint8_t *key, size_t keylen, Error **errp);
/**
* qcrypto_akcipher_rsakey_export_as_p8info:
*
* Export RSA private key to PKCS#8 private key info.
*/
void qcrypto_akcipher_rsakey_export_p8info(const uint8_t *key,
size_t keylen,
uint8_t **dst,
size_t *dlen);
void qcrypto_akcipher_rsakey_free(QCryptoAkCipherRSAKey *key);
G_DEFINE_AUTOPTR_CLEANUP_FUNC(QCryptoAkCipherRSAKey,

21
include/crypto/akcipher.h
View file

@ -153,6 +153,27 @@ int qcrypto_akcipher_max_dgst_len(QCryptoAkCipher *akcipher);
*/
void qcrypto_akcipher_free(QCryptoAkCipher *akcipher);
/**
* qcrypto_akcipher_export_p8info:
* @opts: the options of the akcipher to be exported.
* @key: the original key of the akcipher to be exported.
* @keylen: length of the 'key'
* @dst: output parameter, if export succeed, *dst is set to the
* PKCS#8 encoded private key, caller MUST free this key with
* g_free after use.
* @dst_len: output parameter, indicates the length of PKCS#8 encoded
* key.
*
* Export the akcipher into DER encoded pkcs#8 private key info, expects
* |key| stores a valid asymmetric PRIVATE key.
*
* Returns: 0 for succeed, otherwise -1 is returned.
*/
int qcrypto_akcipher_export_p8info(const QCryptoAkCipherOptions *opts,
uint8_t *key, size_t keylen,
uint8_t **dst, size_t *dst_len,
Error **errp);
G_DEFINE_AUTOPTR_CLEANUP_FUNC(QCryptoAkCipher, qcrypto_akcipher_free)
#endif /* QCRYPTO_AKCIPHER_H */