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crypto: introduce generic cipher API & built-in implementation
Introduce a generic cipher API and an implementation of it that supports only the built-in AES and DES-RFB algorithms. The test suite checks the supported algorithms + modes to validate that every backend implementation is actually correctly complying with the specs. Signed-off-by: Daniel P. Berrange <berrange@redhat.com> Message-Id: <1435770638-25715-5-git-send-email-berrange@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Daniel P. Berrange
Paolo Bonzini
parent
9fd72468df
commit
ca38a4cc9e
7 changed files with 951 additions and 0 deletions
398
crypto/cipher-builtin.c
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398
crypto/cipher-builtin.c
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/*
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* QEMU Crypto cipher built-in algorithms
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*
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* Copyright (c) 2015 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "crypto/aes.h"
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#include "crypto/desrfb.h"
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typedef struct QCryptoCipherBuiltinAES QCryptoCipherBuiltinAES;
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struct QCryptoCipherBuiltinAES {
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AES_KEY encrypt_key;
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AES_KEY decrypt_key;
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uint8_t *iv;
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size_t niv;
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};
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typedef struct QCryptoCipherBuiltinDESRFB QCryptoCipherBuiltinDESRFB;
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struct QCryptoCipherBuiltinDESRFB {
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uint8_t *key;
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size_t nkey;
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};
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typedef struct QCryptoCipherBuiltin QCryptoCipherBuiltin;
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struct QCryptoCipherBuiltin {
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union {
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QCryptoCipherBuiltinAES aes;
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QCryptoCipherBuiltinDESRFB desrfb;
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} state;
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void (*free)(QCryptoCipher *cipher);
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int (*setiv)(QCryptoCipher *cipher,
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const uint8_t *iv, size_t niv,
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Error **errp);
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int (*encrypt)(QCryptoCipher *cipher,
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const void *in,
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void *out,
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size_t len,
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Error **errp);
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int (*decrypt)(QCryptoCipher *cipher,
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const void *in,
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void *out,
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size_t len,
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Error **errp);
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};
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static void qcrypto_cipher_free_aes(QCryptoCipher *cipher)
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{
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QCryptoCipherBuiltin *ctxt = cipher->opaque;
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g_free(ctxt->state.aes.iv);
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g_free(ctxt);
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cipher->opaque = NULL;
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}
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static int qcrypto_cipher_encrypt_aes(QCryptoCipher *cipher,
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const void *in,
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void *out,
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size_t len,
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Error **errp)
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{
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QCryptoCipherBuiltin *ctxt = cipher->opaque;
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if (cipher->mode == QCRYPTO_CIPHER_MODE_ECB) {
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const uint8_t *inptr = in;
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uint8_t *outptr = out;
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while (len) {
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if (len > AES_BLOCK_SIZE) {
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AES_encrypt(inptr, outptr, &ctxt->state.aes.encrypt_key);
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inptr += AES_BLOCK_SIZE;
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outptr += AES_BLOCK_SIZE;
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len -= AES_BLOCK_SIZE;
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} else {
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uint8_t tmp1[AES_BLOCK_SIZE], tmp2[AES_BLOCK_SIZE];
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memcpy(tmp1, inptr, len);
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/* Fill with 0 to avoid valgrind uninitialized reads */
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memset(tmp1 + len, 0, sizeof(tmp1) - len);
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AES_encrypt(tmp1, tmp2, &ctxt->state.aes.encrypt_key);
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memcpy(outptr, tmp2, len);
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len = 0;
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}
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}
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} else {
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AES_cbc_encrypt(in, out, len,
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&ctxt->state.aes.encrypt_key,
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ctxt->state.aes.iv, 1);
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}
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return 0;
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}
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static int qcrypto_cipher_decrypt_aes(QCryptoCipher *cipher,
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const void *in,
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void *out,
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size_t len,
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Error **errp)
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{
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QCryptoCipherBuiltin *ctxt = cipher->opaque;
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if (cipher->mode == QCRYPTO_CIPHER_MODE_ECB) {
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const uint8_t *inptr = in;
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uint8_t *outptr = out;
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while (len) {
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if (len > AES_BLOCK_SIZE) {
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AES_decrypt(inptr, outptr, &ctxt->state.aes.encrypt_key);
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inptr += AES_BLOCK_SIZE;
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outptr += AES_BLOCK_SIZE;
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len -= AES_BLOCK_SIZE;
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} else {
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uint8_t tmp1[AES_BLOCK_SIZE], tmp2[AES_BLOCK_SIZE];
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memcpy(tmp1, inptr, len);
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/* Fill with 0 to avoid valgrind uninitialized reads */
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memset(tmp1 + len, 0, sizeof(tmp1) - len);
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AES_decrypt(tmp1, tmp2, &ctxt->state.aes.encrypt_key);
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memcpy(outptr, tmp2, len);
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len = 0;
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}
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}
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} else {
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AES_cbc_encrypt(in, out, len,
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&ctxt->state.aes.encrypt_key,
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ctxt->state.aes.iv, 1);
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}
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return 0;
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}
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static int qcrypto_cipher_setiv_aes(QCryptoCipher *cipher,
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const uint8_t *iv, size_t niv,
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Error **errp)
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{
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QCryptoCipherBuiltin *ctxt = cipher->opaque;
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if (niv != 16) {
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error_setg(errp, "IV must be 16 bytes not %zu", niv);
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return -1;
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}
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g_free(ctxt->state.aes.iv);
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ctxt->state.aes.iv = g_new0(uint8_t, niv);
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memcpy(ctxt->state.aes.iv, iv, niv);
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ctxt->state.aes.niv = niv;
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return 0;
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}
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static int qcrypto_cipher_init_aes(QCryptoCipher *cipher,
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const uint8_t *key, size_t nkey,
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Error **errp)
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{
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QCryptoCipherBuiltin *ctxt;
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if (cipher->mode != QCRYPTO_CIPHER_MODE_CBC &&
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cipher->mode != QCRYPTO_CIPHER_MODE_ECB) {
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error_setg(errp, "Unsupported cipher mode %d", cipher->mode);
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return -1;
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}
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ctxt = g_new0(QCryptoCipherBuiltin, 1);
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if (AES_set_encrypt_key(key, nkey * 8, &ctxt->state.aes.encrypt_key) != 0) {
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error_setg(errp, "Failed to set encryption key");
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goto error;
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}
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if (AES_set_decrypt_key(key, nkey * 8, &ctxt->state.aes.decrypt_key) != 0) {
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error_setg(errp, "Failed to set decryption key");
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goto error;
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}
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ctxt->free = qcrypto_cipher_free_aes;
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ctxt->setiv = qcrypto_cipher_setiv_aes;
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ctxt->encrypt = qcrypto_cipher_encrypt_aes;
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ctxt->decrypt = qcrypto_cipher_decrypt_aes;
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cipher->opaque = ctxt;
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return 0;
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error:
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g_free(ctxt);
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return -1;
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}
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static void qcrypto_cipher_free_des_rfb(QCryptoCipher *cipher)
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{
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QCryptoCipherBuiltin *ctxt = cipher->opaque;
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g_free(ctxt->state.desrfb.key);
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g_free(ctxt);
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cipher->opaque = NULL;
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}
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static int qcrypto_cipher_encrypt_des_rfb(QCryptoCipher *cipher,
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const void *in,
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void *out,
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size_t len,
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Error **errp)
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{
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QCryptoCipherBuiltin *ctxt = cipher->opaque;
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size_t i;
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if (len % 8) {
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error_setg(errp, "Buffer size must be multiple of 8 not %zu",
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len);
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return -1;
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}
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deskey(ctxt->state.desrfb.key, EN0);
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for (i = 0; i < len; i += 8) {
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des((void *)in + i, out + i);
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}
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return 0;
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}
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static int qcrypto_cipher_decrypt_des_rfb(QCryptoCipher *cipher,
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const void *in,
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void *out,
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size_t len,
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Error **errp)
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{
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QCryptoCipherBuiltin *ctxt = cipher->opaque;
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size_t i;
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if (len % 8) {
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error_setg(errp, "Buffer size must be multiple of 8 not %zu",
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len);
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return -1;
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}
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deskey(ctxt->state.desrfb.key, DE1);
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for (i = 0; i < len; i += 8) {
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des((void *)in + i, out + i);
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}
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return 0;
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}
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static int qcrypto_cipher_setiv_des_rfb(QCryptoCipher *cipher,
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const uint8_t *iv, size_t niv,
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Error **errp)
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{
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error_setg(errp, "Setting IV is not supported");
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return -1;
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}
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static int qcrypto_cipher_init_des_rfb(QCryptoCipher *cipher,
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const uint8_t *key, size_t nkey,
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Error **errp)
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{
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QCryptoCipherBuiltin *ctxt;
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if (cipher->mode != QCRYPTO_CIPHER_MODE_ECB) {
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error_setg(errp, "Unsupported cipher mode %d", cipher->mode);
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return -1;
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}
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ctxt = g_new0(QCryptoCipherBuiltin, 1);
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ctxt->state.desrfb.key = g_new0(uint8_t, nkey);
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memcpy(ctxt->state.desrfb.key, key, nkey);
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ctxt->state.desrfb.nkey = nkey;
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ctxt->free = qcrypto_cipher_free_des_rfb;
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ctxt->setiv = qcrypto_cipher_setiv_des_rfb;
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ctxt->encrypt = qcrypto_cipher_encrypt_des_rfb;
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ctxt->decrypt = qcrypto_cipher_decrypt_des_rfb;
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cipher->opaque = ctxt;
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return 0;
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}
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bool qcrypto_cipher_supports(QCryptoCipherAlgorithm alg)
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{
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switch (alg) {
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case QCRYPTO_CIPHER_ALG_DES_RFB:
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case QCRYPTO_CIPHER_ALG_AES_128:
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case QCRYPTO_CIPHER_ALG_AES_192:
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case QCRYPTO_CIPHER_ALG_AES_256:
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return true;
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default:
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return false;
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}
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}
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QCryptoCipher *qcrypto_cipher_new(QCryptoCipherAlgorithm alg,
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QCryptoCipherMode mode,
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const uint8_t *key, size_t nkey,
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Error **errp)
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{
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QCryptoCipher *cipher;
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cipher = g_new0(QCryptoCipher, 1);
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cipher->alg = alg;
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cipher->mode = mode;
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if (!qcrypto_cipher_validate_key_length(alg, nkey, errp)) {
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goto error;
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}
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switch (cipher->alg) {
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case QCRYPTO_CIPHER_ALG_DES_RFB:
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if (qcrypto_cipher_init_des_rfb(cipher, key, nkey, errp) < 0) {
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goto error;
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}
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break;
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case QCRYPTO_CIPHER_ALG_AES_128:
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case QCRYPTO_CIPHER_ALG_AES_192:
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case QCRYPTO_CIPHER_ALG_AES_256:
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if (qcrypto_cipher_init_aes(cipher, key, nkey, errp) < 0) {
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goto error;
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}
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break;
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default:
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error_setg(errp,
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"Unsupported cipher algorithm %d", cipher->alg);
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goto error;
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}
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return cipher;
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error:
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g_free(cipher);
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return NULL;
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}
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void qcrypto_cipher_free(QCryptoCipher *cipher)
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{
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QCryptoCipherBuiltin *ctxt = cipher->opaque;
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if (!cipher) {
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return;
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}
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ctxt->free(cipher);
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g_free(cipher);
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}
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int qcrypto_cipher_encrypt(QCryptoCipher *cipher,
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const void *in,
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void *out,
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size_t len,
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Error **errp)
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{
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QCryptoCipherBuiltin *ctxt = cipher->opaque;
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return ctxt->encrypt(cipher, in, out, len, errp);
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}
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int qcrypto_cipher_decrypt(QCryptoCipher *cipher,
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const void *in,
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void *out,
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size_t len,
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Error **errp)
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{
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QCryptoCipherBuiltin *ctxt = cipher->opaque;
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return ctxt->decrypt(cipher, in, out, len, errp);
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}
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int qcrypto_cipher_setiv(QCryptoCipher *cipher,
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const uint8_t *iv, size_t niv,
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Error **errp)
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{
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QCryptoCipherBuiltin *ctxt = cipher->opaque;
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return ctxt->setiv(cipher, iv, niv, errp);
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}
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