commit files needed for zpm-fetchurl

[zpackage] / libtomcrypt / src / pk / rsa / rsa_export.c

diff --git a/libtomcrypt/src/pk/rsa/rsa_export.c b/libtomcrypt/src/pk/rsa/rsa_export.c
new file mode 100644 (file)
index 0000000..efd61d6
--- /dev/null
+++ b/libtomcrypt/src/pk/rsa/rsa_export.c
@@ -0,0 +1,97 @@
+/* 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 rsa_export.c
+  Export RSA PKCS keys, Tom St Denis
+*/
+
+#ifdef LTC_MRSA
+
+/**
+    This will export either an RSAPublicKey or RSAPrivateKey [defined in PKCS #1 v2.1]
+    @param out       [out] Destination of the packet
+    @param outlen    [in/out] The max size and resulting size of the packet
+    @param type      The type of exported key (PK_PRIVATE or PK_PUBLIC)
+    @param key       The RSA key to export
+    @return CRYPT_OK if successful
+*/
+int rsa_export(unsigned char *out, unsigned long *outlen, int type, rsa_key *key)
+{
+   unsigned long zero=0;
+   int err;
+   LTC_ARGCHK(out    != NULL);
+   LTC_ARGCHK(outlen != NULL);
+   LTC_ARGCHK(key    != NULL);
+
+   /* type valid? */
+   if (!(key->type == PK_PRIVATE) && (type == PK_PRIVATE)) {
+      return CRYPT_PK_INVALID_TYPE;
+   }
+
+   if (type == PK_PRIVATE) {
+      /* private key */
+      /* output is
+            Version, n, e, d, p, q, d mod (p-1), d mod (q - 1), 1/q mod p
+       */
+      return der_encode_sequence_multi(out, outlen,
+                          LTC_ASN1_SHORT_INTEGER, 1UL, &zero,
+                          LTC_ASN1_INTEGER, 1UL,  key->N,
+                          LTC_ASN1_INTEGER, 1UL,  key->e,
+                          LTC_ASN1_INTEGER, 1UL,  key->d,
+                          LTC_ASN1_INTEGER, 1UL,  key->p,
+                          LTC_ASN1_INTEGER, 1UL,  key->q,
+                          LTC_ASN1_INTEGER, 1UL,  key->dP,
+                          LTC_ASN1_INTEGER, 1UL,  key->dQ,
+                          LTC_ASN1_INTEGER, 1UL,  key->qP,
+                          LTC_ASN1_EOL,     0UL, NULL);
+   } else {
+      /* public key */
+      unsigned long tmplen, *ptmplen;
+      unsigned char* tmp = NULL;
+
+      if (type & PK_STD) {
+          tmplen = (unsigned long)(mp_count_bits(key->N) / 8) * 2 + 8;
+          tmp = XMALLOC(tmplen);
+          ptmplen = &tmplen;
+          if (tmp == NULL) {
+              return CRYPT_MEM;
+          }
+      }
+      else {
+          tmp = out;
+          ptmplen = outlen;
+      }
+
+      err = der_encode_sequence_multi(tmp, ptmplen,
+                                 LTC_ASN1_INTEGER, 1UL,  key->N,
+                                 LTC_ASN1_INTEGER, 1UL,  key->e,
+                                 LTC_ASN1_EOL,     0UL, NULL);
+
+      if ((err != CRYPT_OK) || !(type & PK_STD)) {
+          goto finish;
+      }
+
+      err = der_encode_subject_public_key_info(out, outlen,
+        PKA_RSA, tmp, tmplen, LTC_ASN1_NULL, NULL, 0);
+
+finish:
+      if (tmp != out)
+        XFREE(tmp);
+      return err;
+
+   }
+}
+
+#endif /* LTC_MRSA */
+
+/* ref:         $Format:%D$ */
+/* git commit:  $Format:%H$ */
+/* commit time: $Format:%ai$ */