adding rsa_import_radix

src/headers/tomcrypt_pk.h

@@ -107,6 +107,7 @@ int rsa_sign_saltlen_get_max_ex(int padding, int hash_idx, rsa_key *key);
 int rsa_export(unsigned char *out, unsigned long *outlen, int type, rsa_key *key);
 int rsa_import(const unsigned char *in, unsigned long inlen, rsa_key *key);
 
+int rsa_import_radix(int radix, char *N, char *e, char *d, char *p, char *q, char *dP, char *dQ, char *qP, rsa_key *key);
 #endif
 
 /* ---- Katja ---- */

src/pk/rsa/rsa_import_radix.c

@@ -0,0 +1,64 @@
+/* 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, [email protected], http://libtom.org
+ */
+#include "tomcrypt.h"
+
+/**
+  Import RSA public or private key from raw numbers
+  @param radix   the radix the numbers are represented in (2-64, 16 = hexadecimal)
+  @param N       RSA's N  in radix representation
+  @param e       RSA's e  in radix representation
+  @param d       RSA's d  in radix representation (only private key, NULL for public key)
+  @param p       RSA's p  in radix representation (only private key, NULL for public key)
+  @param q       RSA's q  in radix representation (only private key, NULL for public key)
+  @param dP      RSA's dP in radix representation (only private key, NULL for public key)
+  @param dQ      RSA's dQ in radix representation (only private key, NULL for public key)
+  @param qP      RSA's qP in radix representation (only private key, NULL for public key)
+  @param key     [out] the destination for the imported key
+  @return CRYPT_OK if successful, upon error allocated memory is freed
+*/
+
+#ifdef LTC_MRSA
+
+int rsa_import_radix(int radix, char *N, char *e, char *d, char *p, char *q, char *dP, char *dQ, char *qP, rsa_key *key)
+{
+   int err;
+
+   LTC_ARGCHK(key         != NULL);
+   LTC_ARGCHK(N           != NULL);
+   LTC_ARGCHK(e           != NULL);
+   LTC_ARGCHK(ltc_mp.name != NULL);
+
+   err = mp_init_multi(&key->e, &key->d, &key->N, &key->dQ, &key->dP, &key->qP, &key->p, &key->q, NULL);
+   if (err != CRYPT_OK) return err;
+
+   if ((err = mp_read_radix(key->N , N , radix)) != CRYPT_OK)    { goto LBL_ERR; }
+   if ((err = mp_read_radix(key->e , e , radix)) != CRYPT_OK)    { goto LBL_ERR; }
+   if (d && p && q && dP && dQ && qP && strlen(d)>0 && strlen(p)>0 &&
+       strlen(q)>0 && strlen(dP)>0 && strlen(dQ)>0 && strlen(qP)>0) {
+      if ((err = mp_read_radix(key->d , d , radix)) != CRYPT_OK) { goto LBL_ERR; }
+      if ((err = mp_read_radix(key->p , p , radix)) != CRYPT_OK) { goto LBL_ERR; }
+      if ((err = mp_read_radix(key->q , q , radix)) != CRYPT_OK) { goto LBL_ERR; }
+      if ((err = mp_read_radix(key->dP, dP, radix)) != CRYPT_OK) { goto LBL_ERR; }
+      if ((err = mp_read_radix(key->dQ, dQ, radix)) != CRYPT_OK) { goto LBL_ERR; }
+      if ((err = mp_read_radix(key->qP, qP, radix)) != CRYPT_OK) { goto LBL_ERR; }
+      key->type = PK_PRIVATE;
+   }
+   else {
+      key->type = PK_PUBLIC;
+   }
+   return CRYPT_OK;
+
+LBL_ERR:
+   mp_clear_multi(key->d,  key->e, key->N, key->dQ, key->dP, key->qP, key->p, key->q, NULL);
+   return err;
+}
+
+#endif /* LTC_MRSA */