[git] GCRYPT - branch, master, updated. libgcrypt-1.6.0-53-g121a90d

[by NIIBE Yutaka]

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       via  121a90d8931944974054f7d94f63b7f89df87fa5 (commit)
      from  52f7c48c901a3de51bd690a218f3de2f71e8d790 (commit)

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- Log -----------------------------------------------------------------
commit 121a90d8931944974054f7d94f63b7f89df87fa5
Author: NIIBE Yutaka <gniibe at fsij.org>
Date:   Wed Jan 29 08:32:46 2014 +0900

    Fix RSA Blinding.
    
    * cipher/rsa.c (rsa_decrypt): Loop to get multiplicative inverse.
    
    Signed-off-by: NIIBE Yutaka <gniibe at fsij.org>

diff --git a/cipher/rsa.c b/cipher/rsa.c
index e595e38..9a8d235 100644
--- a/cipher/rsa.c
+++ b/cipher/rsa.c
@@ -1023,13 +1023,12 @@ rsa_decrypt (gcry_sexp_t *r_plain, gcry_sexp_t s_data, gcry_sexp_t keyparms)
       ri = mpi_snew (ctx.nbits);
       bldata = mpi_snew (ctx.nbits);
 
-      _gcry_mpi_randomize (r, ctx.nbits, GCRY_WEAK_RANDOM);
-      mpi_mod (r, r, sk.n);
-      if (!mpi_invm (ri, r, sk.n))
+      do
         {
-          rc = GPG_ERR_INTERNAL;
-          goto leave;
+          _gcry_mpi_randomize (r, ctx.nbits, GCRY_WEAK_RANDOM);
+          mpi_mod (r, r, sk.n);
         }
+      while (!mpi_invm (ri, r, sk.n));
 
       /* Do blinding.  We calculate: y = (x * r^e) mod n, where r is
          the random number, e is the public exponent, x is the

-----------------------------------------------------------------------

Summary of changes:
 cipher/rsa.c |    9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)


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