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crypto: add CTR mode support

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Introduce CTR mode support for the cipher APIs.
CTR mode uses a counter rather than a traditional IV.
The counter has additional properties, including a nonce
and initial counter block. We reuse the ctx->iv as
the counter for conveniences.

Both libgcrypt and nettle are support CTR mode, the
cipher-builtin doesn't support yet.

Signed-off-by: Gonglei <arei.gonglei@huawei.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
This commit is contained in:
Gonglei 2016-09-26 17:23:22 +08:00 • committed by Daniel P. Berrange
parent f844836ddc
commit 3c28292f39
6 changed files with 94 additions and 11 deletions
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15
crypto/cipher-nettle.c
View file

@ -28,6 +28,7 @@
#include <nettle/cast128.h>
#include <nettle/serpent.h>
#include <nettle/twofish.h>
#include <nettle/ctr.h>
typedef void (*QCryptoCipherNettleFuncWrapper)(const void *ctx,
size_t length,
@ -186,7 +187,7 @@ struct QCryptoCipherNettle {
QCryptoCipherNettleFuncNative alg_decrypt_native;
QCryptoCipherNettleFuncWrapper alg_encrypt_wrapper;
QCryptoCipherNettleFuncWrapper alg_decrypt_wrapper;
/* Initialization vector or Counter */
uint8_t *iv;
size_t blocksize;
};
@ -236,6 +237,7 @@ QCryptoCipher *qcrypto_cipher_new(QCryptoCipherAlgorithm alg,
case QCRYPTO_CIPHER_MODE_ECB:
case QCRYPTO_CIPHER_MODE_CBC:
case QCRYPTO_CIPHER_MODE_XTS:
case QCRYPTO_CIPHER_MODE_CTR:
break;
default:
error_setg(errp, "Unsupported cipher mode %s",
@ -441,6 +443,12 @@ int qcrypto_cipher_encrypt(QCryptoCipher *cipher,
ctx->iv, len, out, in);
break;
case QCRYPTO_CIPHER_MODE_CTR:
ctr_crypt(ctx->ctx, ctx->alg_encrypt_native,
ctx->blocksize, ctx->iv,
len, out, in);
break;
default:
error_setg(errp, "Unsupported cipher mode %s",
QCryptoCipherMode_lookup[cipher->mode]);
@ -480,6 +488,11 @@ int qcrypto_cipher_decrypt(QCryptoCipher *cipher,
ctx->alg_encrypt_wrapper, ctx->alg_decrypt_wrapper,
ctx->iv, len, out, in);
break;
case QCRYPTO_CIPHER_MODE_CTR:
ctr_crypt(ctx->ctx, ctx->alg_encrypt_native,
ctx->blocksize, ctx->iv,
len, out, in);
break;
default:
error_setg(errp, "Unsupported cipher mode %s",