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-rw-r--r--src/modes/ofb/ofb_decrypt.c43
-rw-r--r--src/modes/ofb/ofb_done.c42
-rw-r--r--src/modes/ofb/ofb_encrypt.c58
-rw-r--r--src/modes/ofb/ofb_getiv.c45
-rw-r--r--src/modes/ofb/ofb_setiv.c53
-rw-r--r--src/modes/ofb/ofb_start.c60
6 files changed, 301 insertions, 0 deletions
diff --git a/src/modes/ofb/ofb_decrypt.c b/src/modes/ofb/ofb_decrypt.c
new file mode 100644
index 0000000..cf5f19d
--- /dev/null
+++ b/src/modes/ofb/ofb_decrypt.c
@@ -0,0 +1,43 @@
+/* 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 ofb_decrypt.c
+ OFB implementation, decrypt data, Tom St Denis
+*/
+
+#ifdef OFB
+
+/**
+ OFB decrypt
+ @param ct Ciphertext
+ @param pt [out] Plaintext
+ @param len Length of ciphertext (octets)
+ @param ofb OFB state
+ @return CRYPT_OK if successful
+*/
+int ofb_decrypt(const unsigned char *ct, unsigned char *pt, unsigned long len, symmetric_OFB *ofb)
+{
+ LTC_ARGCHK(pt != NULL);
+ LTC_ARGCHK(ct != NULL);
+ LTC_ARGCHK(ofb != NULL);
+ return ofb_encrypt(ct, pt, len, ofb);
+}
+
+
+#endif
+
+
+
+/* $Source: /cvs/libtom/libtomcrypt/src/modes/ofb/ofb_decrypt.c,v $ */
+/* $Revision: 1.3 $ */
+/* $Date: 2005/05/05 14:35:59 $ */
diff --git a/src/modes/ofb/ofb_done.c b/src/modes/ofb/ofb_done.c
new file mode 100644
index 0000000..5e114f4
--- /dev/null
+++ b/src/modes/ofb/ofb_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 ofb_done.c
+ OFB implementation, finish chain, Tom St Denis
+*/
+
+#ifdef OFB
+
+/** Terminate the chain
+ @param ofb The OFB chain to terminate
+ @return CRYPT_OK on success
+*/
+int ofb_done(symmetric_OFB *ofb)
+{
+ int err;
+ LTC_ARGCHK(ofb != NULL);
+
+ if ((err = cipher_is_valid(ofb->cipher)) != CRYPT_OK) {
+ return err;
+ }
+ cipher_descriptor[ofb->cipher].done(&ofb->key);
+ return CRYPT_OK;
+}
+
+
+
+#endif
+
+/* $Source: /cvs/libtom/libtomcrypt/src/modes/ofb/ofb_done.c,v $ */
+/* $Revision: 1.4 $ */
+/* $Date: 2005/05/05 14:35:59 $ */
diff --git a/src/modes/ofb/ofb_encrypt.c b/src/modes/ofb/ofb_encrypt.c
new file mode 100644
index 0000000..d66979a
--- /dev/null
+++ b/src/modes/ofb/ofb_encrypt.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 ofb_encrypt.c
+ OFB implementation, encrypt data, Tom St Denis
+*/
+
+#ifdef OFB
+
+/**
+ OFB encrypt
+ @param pt Plaintext
+ @param ct [out] Ciphertext
+ @param len Length of plaintext (octets)
+ @param ofb OFB state
+ @return CRYPT_OK if successful
+*/
+int ofb_encrypt(const unsigned char *pt, unsigned char *ct, unsigned long len, symmetric_OFB *ofb)
+{
+ int err;
+ LTC_ARGCHK(pt != NULL);
+ LTC_ARGCHK(ct != NULL);
+ LTC_ARGCHK(ofb != NULL);
+ if ((err = cipher_is_valid(ofb->cipher)) != CRYPT_OK) {
+ return err;
+ }
+
+ /* is blocklen/padlen valid? */
+ if (ofb->blocklen < 0 || ofb->blocklen > (int)sizeof(ofb->IV) ||
+ ofb->padlen < 0 || ofb->padlen > (int)sizeof(ofb->IV)) {
+ return CRYPT_INVALID_ARG;
+ }
+
+ while (len-- > 0) {
+ if (ofb->padlen == ofb->blocklen) {
+ cipher_descriptor[ofb->cipher].ecb_encrypt(ofb->IV, ofb->IV, &ofb->key);
+ ofb->padlen = 0;
+ }
+ *ct++ = *pt++ ^ ofb->IV[ofb->padlen++];
+ }
+ return CRYPT_OK;
+}
+
+#endif
+
+/* $Source: /cvs/libtom/libtomcrypt/src/modes/ofb/ofb_encrypt.c,v $ */
+/* $Revision: 1.3 $ */
+/* $Date: 2005/05/05 14:35:59 $ */
diff --git a/src/modes/ofb/ofb_getiv.c b/src/modes/ofb/ofb_getiv.c
new file mode 100644
index 0000000..f945fff
--- /dev/null
+++ b/src/modes/ofb/ofb_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 ofb_getiv.c
+ OFB implementation, get IV, Tom St Denis
+*/
+
+#ifdef OFB
+
+/**
+ 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 ofb The OFB state
+ @return CRYPT_OK if successful
+*/
+int ofb_getiv(unsigned char *IV, unsigned long *len, symmetric_OFB *ofb)
+{
+ LTC_ARGCHK(IV != NULL);
+ LTC_ARGCHK(len != NULL);
+ LTC_ARGCHK(ofb != NULL);
+ if ((unsigned long)ofb->blocklen > *len) {
+ return CRYPT_BUFFER_OVERFLOW;
+ }
+ XMEMCPY(IV, ofb->IV, ofb->blocklen);
+ *len = ofb->blocklen;
+
+ return CRYPT_OK;
+}
+
+#endif
+
+/* $Source: /cvs/libtom/libtomcrypt/src/modes/ofb/ofb_getiv.c,v $ */
+/* $Revision: 1.3 $ */
+/* $Date: 2005/05/05 14:35:59 $ */
diff --git a/src/modes/ofb/ofb_setiv.c b/src/modes/ofb/ofb_setiv.c
new file mode 100644
index 0000000..f678601
--- /dev/null
+++ b/src/modes/ofb/ofb_setiv.c
@@ -0,0 +1,53 @@
+/* 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 ofb_setiv.c
+ OFB implementation, set IV, Tom St Denis
+*/
+
+#ifdef OFB
+
+/**
+ Set an initial vector
+ @param IV The initial vector
+ @param len The length of the vector (in octets)
+ @param ofb The OFB state
+ @return CRYPT_OK if successful
+*/
+int ofb_setiv(const unsigned char *IV, unsigned long len, symmetric_OFB *ofb)
+{
+ int err;
+
+ LTC_ARGCHK(IV != NULL);
+ LTC_ARGCHK(ofb != NULL);
+
+ if ((err = cipher_is_valid(ofb->cipher)) != CRYPT_OK) {
+ return err;
+ }
+
+ if (len != (unsigned long)ofb->blocklen) {
+ return CRYPT_INVALID_ARG;
+ }
+
+ /* force next block */
+ ofb->padlen = 0;
+ cipher_descriptor[ofb->cipher].ecb_encrypt(IV, ofb->IV, &ofb->key);
+ return CRYPT_OK;
+}
+
+#endif
+
+
+/* $Source: /cvs/libtom/libtomcrypt/src/modes/ofb/ofb_setiv.c,v $ */
+/* $Revision: 1.3 $ */
+/* $Date: 2005/05/05 14:35:59 $ */
diff --git a/src/modes/ofb/ofb_start.c b/src/modes/ofb/ofb_start.c
new file mode 100644
index 0000000..083e381
--- /dev/null
+++ b/src/modes/ofb/ofb_start.c
@@ -0,0 +1,60 @@
+/* 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 ofb_start.c
+ OFB implementation, start chain, Tom St Denis
+*/
+
+
+#ifdef OFB
+
+/**
+ Initialize a OFB 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 ofb The OFB state to initialize
+ @return CRYPT_OK if successful
+*/
+int ofb_start(int cipher, const unsigned char *IV, const unsigned char *key,
+ int keylen, int num_rounds, symmetric_OFB *ofb)
+{
+ int x, err;
+
+ LTC_ARGCHK(IV != NULL);
+ LTC_ARGCHK(key != NULL);
+ LTC_ARGCHK(ofb != NULL);
+
+ if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
+ return err;
+ }
+
+ /* copy details */
+ ofb->cipher = cipher;
+ ofb->blocklen = cipher_descriptor[cipher].block_length;
+ for (x = 0; x < ofb->blocklen; x++) {
+ ofb->IV[x] = IV[x];
+ }
+
+ /* init the cipher */
+ ofb->padlen = ofb->blocklen;
+ return cipher_descriptor[cipher].setup(key, keylen, num_rounds, &ofb->key);
+}
+
+#endif
+
+/* $Source: /cvs/libtom/libtomcrypt/src/modes/ofb/ofb_start.c,v $ */
+/* $Revision: 1.3 $ */
+/* $Date: 2005/05/05 14:35:59 $ */
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