summaryrefslogtreecommitdiffhomepage
path: root/libtomcrypt/src/modes/ctr
diff options
context:
space:
mode:
Diffstat (limited to 'libtomcrypt/src/modes/ctr')
-rw-r--r--libtomcrypt/src/modes/ctr/ctr_decrypt.c42
-rw-r--r--libtomcrypt/src/modes/ctr/ctr_done.c42
-rw-r--r--libtomcrypt/src/modes/ctr/ctr_encrypt.c108
-rw-r--r--libtomcrypt/src/modes/ctr/ctr_getiv.c45
-rw-r--r--libtomcrypt/src/modes/ctr/ctr_setiv.c58
-rw-r--r--libtomcrypt/src/modes/ctr/ctr_start.c70
6 files changed, 365 insertions, 0 deletions
diff --git a/libtomcrypt/src/modes/ctr/ctr_decrypt.c b/libtomcrypt/src/modes/ctr/ctr_decrypt.c
new file mode 100644
index 0000000..e1d1d51
--- /dev/null
+++ b/libtomcrypt/src/modes/ctr/ctr_decrypt.c
@@ -0,0 +1,42 @@
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis
+ *
+ * LibTomCrypt is a library that provides various cryptographic
+ * algorithms in a highly modular and flexible manner.
+ *
+ * The library is free for all purposes without any express
+ * guarantee it works.
+ *
+ * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org
+ */
+#include "tomcrypt.h"
+
+/**
+ @file ctr_decrypt.c
+ CTR implementation, decrypt data, Tom St Denis
+*/
+
+#ifdef CTR
+
+/**
+ CTR decrypt
+ @param ct Ciphertext
+ @param pt [out] Plaintext
+ @param len Length of ciphertext (octets)
+ @param ctr CTR state
+ @return CRYPT_OK if successful
+*/
+int ctr_decrypt(const unsigned char *ct, unsigned char *pt, unsigned long len, symmetric_CTR *ctr)
+{
+ LTC_ARGCHK(pt != NULL);
+ LTC_ARGCHK(ct != NULL);
+ LTC_ARGCHK(ctr != NULL);
+
+ return ctr_encrypt(ct, pt, len, ctr);
+}
+
+#endif
+
+
+/* $Source: /cvs/libtom/libtomcrypt/src/modes/ctr/ctr_decrypt.c,v $ */
+/* $Revision: 1.3 $ */
+/* $Date: 2005/05/05 14:35:59 $ */
diff --git a/libtomcrypt/src/modes/ctr/ctr_done.c b/libtomcrypt/src/modes/ctr/ctr_done.c
new file mode 100644
index 0000000..f2e79ba
--- /dev/null
+++ b/libtomcrypt/src/modes/ctr/ctr_done.c
@@ -0,0 +1,42 @@
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis
+ *
+ * LibTomCrypt is a library that provides various cryptographic
+ * algorithms in a highly modular and flexible manner.
+ *
+ * The library is free for all purposes without any express
+ * guarantee it works.
+ *
+ * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org
+ */
+#include "tomcrypt.h"
+
+/**
+ @file ctr_done.c
+ CTR implementation, finish chain, Tom St Denis
+*/
+
+#ifdef CTR
+
+/** Terminate the chain
+ @param ctr The CTR chain to terminate
+ @return CRYPT_OK on success
+*/
+int ctr_done(symmetric_CTR *ctr)
+{
+ int err;
+ LTC_ARGCHK(ctr != NULL);
+
+ if ((err = cipher_is_valid(ctr->cipher)) != CRYPT_OK) {
+ return err;
+ }
+ cipher_descriptor[ctr->cipher].done(&ctr->key);
+ return CRYPT_OK;
+}
+
+
+
+#endif
+
+/* $Source: /cvs/libtom/libtomcrypt/src/modes/ctr/ctr_done.c,v $ */
+/* $Revision: 1.4 $ */
+/* $Date: 2005/05/05 14:35:59 $ */
diff --git a/libtomcrypt/src/modes/ctr/ctr_encrypt.c b/libtomcrypt/src/modes/ctr/ctr_encrypt.c
new file mode 100644
index 0000000..79795ae
--- /dev/null
+++ b/libtomcrypt/src/modes/ctr/ctr_encrypt.c
@@ -0,0 +1,108 @@
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis
+ *
+ * LibTomCrypt is a library that provides various cryptographic
+ * algorithms in a highly modular and flexible manner.
+ *
+ * The library is free for all purposes without any express
+ * guarantee it works.
+ *
+ * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org
+ */
+#include "tomcrypt.h"
+
+/**
+ @file ctr_encrypt.c
+ CTR implementation, encrypt data, Tom St Denis
+*/
+
+
+#ifdef CTR
+
+/**
+ CTR encrypt
+ @param pt Plaintext
+ @param ct [out] Ciphertext
+ @param len Length of plaintext (octets)
+ @param ctr CTR state
+ @return CRYPT_OK if successful
+*/
+int ctr_encrypt(const unsigned char *pt, unsigned char *ct, unsigned long len, symmetric_CTR *ctr)
+{
+ int x, err;
+
+ LTC_ARGCHK(pt != NULL);
+ LTC_ARGCHK(ct != NULL);
+ LTC_ARGCHK(ctr != NULL);
+
+ if ((err = cipher_is_valid(ctr->cipher)) != CRYPT_OK) {
+ return err;
+ }
+
+ /* is blocklen/padlen valid? */
+ if (ctr->blocklen < 0 || ctr->blocklen > (int)sizeof(ctr->ctr) ||
+ ctr->padlen < 0 || ctr->padlen > (int)sizeof(ctr->pad)) {
+ return CRYPT_INVALID_ARG;
+ }
+
+#ifdef LTC_FAST
+ if (ctr->blocklen % sizeof(LTC_FAST_TYPE)) {
+ return CRYPT_INVALID_ARG;
+ }
+#endif
+
+ /* handle acceleration only if pad is empty, accelerator is present and length is >= a block size */
+ if ((ctr->padlen == ctr->blocklen) && cipher_descriptor[ctr->cipher].accel_ctr_encrypt != NULL && (len >= (unsigned long)ctr->blocklen)) {
+ cipher_descriptor[ctr->cipher].accel_ctr_encrypt(pt, ct, len/ctr->blocklen, ctr->ctr, ctr->mode, &ctr->key);
+ len %= ctr->blocklen;
+ }
+
+ while (len) {
+ /* is the pad empty? */
+ if (ctr->padlen == ctr->blocklen) {
+ /* increment counter */
+ if (ctr->mode == CTR_COUNTER_LITTLE_ENDIAN) {
+ /* little-endian */
+ for (x = 0; x < ctr->blocklen; x++) {
+ ctr->ctr[x] = (ctr->ctr[x] + (unsigned char)1) & (unsigned char)255;
+ if (ctr->ctr[x] != (unsigned char)0) {
+ break;
+ }
+ }
+ } else {
+ /* big-endian */
+ for (x = ctr->blocklen-1; x >= 0; x--) {
+ ctr->ctr[x] = (ctr->ctr[x] + (unsigned char)1) & (unsigned char)255;
+ if (ctr->ctr[x] != (unsigned char)0) {
+ break;
+ }
+ }
+ }
+
+ /* encrypt it */
+ cipher_descriptor[ctr->cipher].ecb_encrypt(ctr->ctr, ctr->pad, &ctr->key);
+ ctr->padlen = 0;
+ }
+#ifdef LTC_FAST
+ if (ctr->padlen == 0 && len >= (unsigned long)ctr->blocklen) {
+ for (x = 0; x < ctr->blocklen; x += sizeof(LTC_FAST_TYPE)) {
+ *((LTC_FAST_TYPE*)((unsigned char *)ct + x)) = *((LTC_FAST_TYPE*)((unsigned char *)pt + x)) ^
+ *((LTC_FAST_TYPE*)((unsigned char *)ctr->pad + x));
+ }
+ pt += ctr->blocklen;
+ ct += ctr->blocklen;
+ len -= ctr->blocklen;
+ ctr->padlen = ctr->blocklen;
+ continue;
+ }
+#endif
+ *ct++ = *pt++ ^ ctr->pad[ctr->padlen++];
+ --len;
+ }
+ return CRYPT_OK;
+}
+
+#endif
+
+/* $Source: /cvs/libtom/libtomcrypt/src/modes/ctr/ctr_encrypt.c,v $ */
+/* $Revision: 1.13 $ */
+/* $Date: 2005/05/05 14:35:59 $ */
diff --git a/libtomcrypt/src/modes/ctr/ctr_getiv.c b/libtomcrypt/src/modes/ctr/ctr_getiv.c
new file mode 100644
index 0000000..50ce6a0
--- /dev/null
+++ b/libtomcrypt/src/modes/ctr/ctr_getiv.c
@@ -0,0 +1,45 @@
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis
+ *
+ * LibTomCrypt is a library that provides various cryptographic
+ * algorithms in a highly modular and flexible manner.
+ *
+ * The library is free for all purposes without any express
+ * guarantee it works.
+ *
+ * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org
+ */
+#include "tomcrypt.h"
+
+/**
+ @file ctr_getiv.c
+ CTR implementation, get IV, Tom St Denis
+*/
+
+#ifdef CTR
+
+/**
+ Get the current initial vector
+ @param IV [out] The destination of the initial vector
+ @param len [in/out] The max size and resulting size of the initial vector
+ @param ctr The CTR state
+ @return CRYPT_OK if successful
+*/
+int ctr_getiv(unsigned char *IV, unsigned long *len, symmetric_CTR *ctr)
+{
+ LTC_ARGCHK(IV != NULL);
+ LTC_ARGCHK(len != NULL);
+ LTC_ARGCHK(ctr != NULL);
+ if ((unsigned long)ctr->blocklen > *len) {
+ return CRYPT_BUFFER_OVERFLOW;
+ }
+ XMEMCPY(IV, ctr->ctr, ctr->blocklen);
+ *len = ctr->blocklen;
+
+ return CRYPT_OK;
+}
+
+#endif
+
+/* $Source: /cvs/libtom/libtomcrypt/src/modes/ctr/ctr_getiv.c,v $ */
+/* $Revision: 1.3 $ */
+/* $Date: 2005/05/05 14:35:59 $ */
diff --git a/libtomcrypt/src/modes/ctr/ctr_setiv.c b/libtomcrypt/src/modes/ctr/ctr_setiv.c
new file mode 100644
index 0000000..64d4c43
--- /dev/null
+++ b/libtomcrypt/src/modes/ctr/ctr_setiv.c
@@ -0,0 +1,58 @@
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis
+ *
+ * LibTomCrypt is a library that provides various cryptographic
+ * algorithms in a highly modular and flexible manner.
+ *
+ * The library is free for all purposes without any express
+ * guarantee it works.
+ *
+ * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org
+ */
+#include "tomcrypt.h"
+
+/**
+ @file ctr_setiv.c
+ CTR implementation, set IV, Tom St Denis
+*/
+
+#ifdef CTR
+
+/**
+ Set an initial vector
+ @param IV The initial vector
+ @param len The length of the vector (in octets)
+ @param ctr The CTR state
+ @return CRYPT_OK if successful
+*/
+int ctr_setiv(const unsigned char *IV, unsigned long len, symmetric_CTR *ctr)
+{
+ int err;
+
+ LTC_ARGCHK(IV != NULL);
+ LTC_ARGCHK(ctr != NULL);
+
+ /* bad param? */
+ if ((err = cipher_is_valid(ctr->cipher)) != CRYPT_OK) {
+ return err;
+ }
+
+ if (len != (unsigned long)ctr->blocklen) {
+ return CRYPT_INVALID_ARG;
+ }
+
+ /* set IV */
+ XMEMCPY(ctr->ctr, IV, len);
+
+ /* force next block */
+ ctr->padlen = 0;
+ cipher_descriptor[ctr->cipher].ecb_encrypt(IV, ctr->pad, &ctr->key);
+
+ return CRYPT_OK;
+}
+
+#endif
+
+
+/* $Source: /cvs/libtom/libtomcrypt/src/modes/ctr/ctr_setiv.c,v $ */
+/* $Revision: 1.3 $ */
+/* $Date: 2005/05/05 14:35:59 $ */
diff --git a/libtomcrypt/src/modes/ctr/ctr_start.c b/libtomcrypt/src/modes/ctr/ctr_start.c
new file mode 100644
index 0000000..7c7eebb
--- /dev/null
+++ b/libtomcrypt/src/modes/ctr/ctr_start.c
@@ -0,0 +1,70 @@
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis
+ *
+ * LibTomCrypt is a library that provides various cryptographic
+ * algorithms in a highly modular and flexible manner.
+ *
+ * The library is free for all purposes without any express
+ * guarantee it works.
+ *
+ * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org
+ */
+#include "tomcrypt.h"
+
+/**
+ @file ctr_start.c
+ CTR implementation, start chain, Tom St Denis
+*/
+
+
+#ifdef CTR
+
+/**
+ Initialize a CTR context
+ @param cipher The index of the cipher desired
+ @param IV The initial vector
+ @param key The secret key
+ @param keylen The length of the secret key (octets)
+ @param num_rounds Number of rounds in the cipher desired (0 for default)
+ @param ctr_mode The counter mode (CTR_COUNTER_LITTLE_ENDIAN or CTR_COUNTER_BIG_ENDIAN)
+ @param ctr The CTR state to initialize
+ @return CRYPT_OK if successful
+*/
+int ctr_start( int cipher,
+ const unsigned char *IV,
+ const unsigned char *key, int keylen,
+ int num_rounds, int ctr_mode,
+ symmetric_CTR *ctr)
+{
+ int x, err;
+
+ LTC_ARGCHK(IV != NULL);
+ LTC_ARGCHK(key != NULL);
+ LTC_ARGCHK(ctr != NULL);
+
+ /* bad param? */
+ if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
+ return err;
+ }
+
+ /* setup cipher */
+ if ((err = cipher_descriptor[cipher].setup(key, keylen, num_rounds, &ctr->key)) != CRYPT_OK) {
+ return err;
+ }
+
+ /* copy ctr */
+ ctr->blocklen = cipher_descriptor[cipher].block_length;
+ ctr->cipher = cipher;
+ ctr->padlen = 0;
+ ctr->mode = ctr_mode;
+ for (x = 0; x < ctr->blocklen; x++) {
+ ctr->ctr[x] = IV[x];
+ }
+ cipher_descriptor[ctr->cipher].ecb_encrypt(ctr->ctr, ctr->pad, &ctr->key);
+ return CRYPT_OK;
+}
+
+#endif
+
+/* $Source: /cvs/libtom/libtomcrypt/src/modes/ctr/ctr_start.c,v $ */
+/* $Revision: 1.6 $ */
+/* $Date: 2005/05/05 14:35:59 $ */
generated by cgit v1.2.3 (git 2.39.1) at 2025-02-17 13:01:19 +0000