X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=libtomcrypt%2Fsrc%2Fpk%2Fpkcs1%2Fpkcs_1_i2osp.c;fp=libtomcrypt%2Fsrc%2Fpk%2Fpkcs1%2Fpkcs_1_i2osp.c;h=5324c1ea14d87f318a4db8a86f699011f457422d;hb=66bc25938679f1d6a1d1200f329093d82a5e99b4;hp=0000000000000000000000000000000000000000;hpb=a52ee0733f420ca20224049260d6fc5cf7d8f621;p=zpackage

diff --git a/libtomcrypt/src/pk/pkcs1/pkcs_1_i2osp.c b/libtomcrypt/src/pk/pkcs1/pkcs_1_i2osp.c
new file mode 100644
index 0000000..5324c1e
--- /dev/null
+++ b/libtomcrypt/src/pk/pkcs1/pkcs_1_i2osp.c
@@ -0,0 +1,49 @@
+/* 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.
+ */
+#include "tomcrypt.h"
+
+/**
+  @file pkcs_1_i2osp.c
+  Integer to Octet I2OSP, Tom St Denis
+*/
+
+#ifdef LTC_PKCS_1
+
+/* always stores the same # of bytes, pads with leading zero bytes
+   as required
+ */
+
+/**
+   PKCS #1 Integer to binary
+   @param n             The integer to store
+   @param modulus_len   The length of the RSA modulus
+   @param out           [out] The destination for the integer
+   @return CRYPT_OK if successful
+*/
+int pkcs_1_i2osp(void *n, unsigned long modulus_len, unsigned char *out)
+{
+   unsigned long size;
+
+   size = mp_unsigned_bin_size(n);
+
+   if (size > modulus_len) {
+      return CRYPT_BUFFER_OVERFLOW;
+   }
+
+   /* store it */
+   zeromem(out, modulus_len);
+   return mp_to_unsigned_bin(n, out+(modulus_len-size));
+}
+
+#endif /* LTC_PKCS_1 */
+
+
+/* ref:         $Format:%D$ */
+/* git commit:  $Format:%H$ */
+/* commit time: $Format:%ai$ */