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authorDaniel P. Berrange <berrange@redhat.com>2016-02-10 17:07:42 +0000
committerDaniel P. Berrange <berrange@redhat.com>2016-03-17 14:41:15 +0000
commit94318522ed7930863924b3191ea8fee1d8cbe506 (patch)
treea403464d7a4ab7853628ea9891f5c05fe671fcf2 /crypto
parent084a85eeddfe1ab84b861971b6efd976d2ae3d1f (diff)
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crypto: add support for the serpent cipher algorithm
New cipher algorithms 'serpent-128', 'serpent-192' and 'serpent-256' are defined for the Serpent algorithm. The nettle and gcrypt cipher backends are updated to support the new cipher and a test vector added to the cipher test suite. The new algorithm is enabled in the LUKS block encryption driver. Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Fam Zheng <famz@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Diffstat (limited to 'crypto')
-rw-r--r--crypto/cipher-gcrypt.c18
-rw-r--r--crypto/cipher-nettle.c31
-rw-r--r--crypto/cipher.c6
3 files changed, 55 insertions, 0 deletions
diff --git a/crypto/cipher-gcrypt.c b/crypto/cipher-gcrypt.c
index aa1d8c5..a667d59 100644
--- a/crypto/cipher-gcrypt.c
+++ b/crypto/cipher-gcrypt.c
@@ -30,6 +30,9 @@ bool qcrypto_cipher_supports(QCryptoCipherAlgorithm alg)
case QCRYPTO_CIPHER_ALG_AES_192:
case QCRYPTO_CIPHER_ALG_AES_256:
case QCRYPTO_CIPHER_ALG_CAST5_128:
+ case QCRYPTO_CIPHER_ALG_SERPENT_128:
+ case QCRYPTO_CIPHER_ALG_SERPENT_192:
+ case QCRYPTO_CIPHER_ALG_SERPENT_256:
return true;
default:
return false;
@@ -89,6 +92,18 @@ QCryptoCipher *qcrypto_cipher_new(QCryptoCipherAlgorithm alg,
gcryalg = GCRY_CIPHER_CAST5;
break;
+ case QCRYPTO_CIPHER_ALG_SERPENT_128:
+ gcryalg = GCRY_CIPHER_SERPENT128;
+ break;
+
+ case QCRYPTO_CIPHER_ALG_SERPENT_192:
+ gcryalg = GCRY_CIPHER_SERPENT192;
+ break;
+
+ case QCRYPTO_CIPHER_ALG_SERPENT_256:
+ gcryalg = GCRY_CIPHER_SERPENT256;
+ break;
+
default:
error_setg(errp, "Unsupported cipher algorithm %d", alg);
return NULL;
@@ -122,6 +137,9 @@ QCryptoCipher *qcrypto_cipher_new(QCryptoCipherAlgorithm alg,
case QCRYPTO_CIPHER_ALG_AES_128:
case QCRYPTO_CIPHER_ALG_AES_192:
case QCRYPTO_CIPHER_ALG_AES_256:
+ case QCRYPTO_CIPHER_ALG_SERPENT_128:
+ case QCRYPTO_CIPHER_ALG_SERPENT_192:
+ case QCRYPTO_CIPHER_ALG_SERPENT_256:
ctx->blocksize = 16;
break;
case QCRYPTO_CIPHER_ALG_CAST5_128:
diff --git a/crypto/cipher-nettle.c b/crypto/cipher-nettle.c
index cfa69cc..74b55ab 100644
--- a/crypto/cipher-nettle.c
+++ b/crypto/cipher-nettle.c
@@ -24,6 +24,7 @@
#include <nettle/des.h>
#include <nettle/cbc.h>
#include <nettle/cast128.h>
+#include <nettle/serpent.h>
#if CONFIG_NETTLE_VERSION_MAJOR < 3
typedef nettle_crypt_func nettle_cipher_func;
@@ -76,6 +77,18 @@ static void cast128_decrypt_wrapper(cipher_ctx_t ctx, cipher_length_t length,
cast128_decrypt(ctx, length, dst, src);
}
+static void serpent_encrypt_wrapper(cipher_ctx_t ctx, cipher_length_t length,
+ uint8_t *dst, const uint8_t *src)
+{
+ serpent_encrypt(ctx, length, dst, src);
+}
+
+static void serpent_decrypt_wrapper(cipher_ctx_t ctx, cipher_length_t length,
+ uint8_t *dst, const uint8_t *src)
+{
+ serpent_decrypt(ctx, length, dst, src);
+}
+
typedef struct QCryptoCipherNettle QCryptoCipherNettle;
struct QCryptoCipherNettle {
void *ctx_encrypt;
@@ -94,6 +107,9 @@ bool qcrypto_cipher_supports(QCryptoCipherAlgorithm alg)
case QCRYPTO_CIPHER_ALG_AES_192:
case QCRYPTO_CIPHER_ALG_AES_256:
case QCRYPTO_CIPHER_ALG_CAST5_128:
+ case QCRYPTO_CIPHER_ALG_SERPENT_128:
+ case QCRYPTO_CIPHER_ALG_SERPENT_192:
+ case QCRYPTO_CIPHER_ALG_SERPENT_256:
return true;
default:
return false;
@@ -169,6 +185,21 @@ QCryptoCipher *qcrypto_cipher_new(QCryptoCipherAlgorithm alg,
ctx->blocksize = CAST128_BLOCK_SIZE;
break;
+
+ case QCRYPTO_CIPHER_ALG_SERPENT_128:
+ case QCRYPTO_CIPHER_ALG_SERPENT_192:
+ case QCRYPTO_CIPHER_ALG_SERPENT_256:
+ ctx->ctx_encrypt = g_new0(struct serpent_ctx, 1);
+ ctx->ctx_decrypt = NULL; /* 1 ctx can do both */
+
+ serpent_set_key(ctx->ctx_encrypt, nkey, key);
+
+ ctx->alg_encrypt = serpent_encrypt_wrapper;
+ ctx->alg_decrypt = serpent_decrypt_wrapper;
+
+ ctx->blocksize = SERPENT_BLOCK_SIZE;
+ break;
+
default:
error_setg(errp, "Unsupported cipher algorithm %d", alg);
goto error;
diff --git a/crypto/cipher.c b/crypto/cipher.c
index 9e0a226..0f6fe98 100644
--- a/crypto/cipher.c
+++ b/crypto/cipher.c
@@ -28,6 +28,9 @@ static size_t alg_key_len[QCRYPTO_CIPHER_ALG__MAX] = {
[QCRYPTO_CIPHER_ALG_AES_256] = 32,
[QCRYPTO_CIPHER_ALG_DES_RFB] = 8,
[QCRYPTO_CIPHER_ALG_CAST5_128] = 16,
+ [QCRYPTO_CIPHER_ALG_SERPENT_128] = 16,
+ [QCRYPTO_CIPHER_ALG_SERPENT_192] = 24,
+ [QCRYPTO_CIPHER_ALG_SERPENT_256] = 32,
};
static size_t alg_block_len[QCRYPTO_CIPHER_ALG__MAX] = {
@@ -36,6 +39,9 @@ static size_t alg_block_len[QCRYPTO_CIPHER_ALG__MAX] = {
[QCRYPTO_CIPHER_ALG_AES_256] = 16,
[QCRYPTO_CIPHER_ALG_DES_RFB] = 8,
[QCRYPTO_CIPHER_ALG_CAST5_128] = 8,
+ [QCRYPTO_CIPHER_ALG_SERPENT_128] = 16,
+ [QCRYPTO_CIPHER_ALG_SERPENT_192] = 16,
+ [QCRYPTO_CIPHER_ALG_SERPENT_256] = 16,
};
static bool mode_need_iv[QCRYPTO_CIPHER_MODE__MAX] = {