modular arithmetics

[openssl.git] / CHANGES

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-
  OpenSSL CHANGES
  _______________
 
  Changes between 0.9.6 and 0.9.7  [xx XXX 2000]
 
+  *) New function BN_swap.
+     [Bodo Moeller]
+
+  *) Use BN_nnmod instead of BN_mod in crypto/bn/bn_exp.c so that
+     the exponentiation functions are more likely to produce reasonable
+     results on negative inputs.
+     [Bodo Moeller]
+
+  *) Change BN_mod_mul so that the result is always non-negative.
+     Previously, it could be negative if one of the factors was negative;
+     I don't think anyone really wanted that behaviour.
+     [Bodo Moeller]
+
+  *) Move BN_mod_... functions into new file crypto/bn/bn_mod.c
+     (except for exponentation, which stays in crypto/bn/bn_exp.c,
+     and BN_mod_mul_reciprocal, which stays in crypto/bn/bn_recp.c)
+     and add new functions:
+          BN_nnmod
+          BN_mod_sqr
+          BN_mod_add
+          BN_mod_sub
+     These functions always generate non-negative results.
+     BN_nnmod otherwise is like BN_mod (if BN_mod computes a remainder  r
+     such that  |m| < r < 0,  BN_nnmod will output  rem + |m|  instead).
+     [Lenka Fibikova <fibikova@exp-math.uni-essen.de>, Bodo Moeller]
+
+  *) Remove a few calls to bn_wexpand() in BN_sqr() (the one in there
+     was actually never needed) and in BN_mul().  The removal in BN_mul()
+     required a small change in bn_mul_part_recursive() and the addition
+     of the static functions bn_cmp_part_words(), bn_sub_part_words()
+     and bn_add_part_words() which do the same thing as bn_cmp_words(),
+     bn_sub_words() and bn_add_words() except they take arrays with
+     differing sizes.
+     [Richard Levitte]
+
+  *) In 'openssl passwd', verify passwords read from the terminal
+     unless the '-salt' option is used (which usually means that
+     verification would just waste user's time since the resulting
+     hash is going to be compared with some given password hash)
+     or the new '-noverify' option is used.
+
+     This is an incompatible change, but it does not affect
+     non-interactive use of 'openssl passwd' (passwords on the command
+     line, '-stdin' option, '-in ...' option) and thus should not
+     cause any problems.
+     [Bodo Moeller]
+
+  *) Remove all references to RSAref, since there's no more need for it.
+     [Richard Levitte]
+
+  *) Increase BN_CTX_NUM (the number of BIGNUMs in a BN_CTX) to 16.
+     The previous value, 12, was not always sufficient for BN_mod_exp().
+     [Bodo Moeller]
+
+  *) Make DSO load along a path given through an environment variable
+     (SHLIB_PATH) with shl_load().
+     [Richard Levitte]
+
+  *) Constify the ENGINE code as a result of BIGNUM constification.
+     Also constify the RSA code and most things related to it.  In a
+     few places, most notable in the depth of the ASN.1 code, ugly
+     casts back to non-const were required (to be solved at a later
+     time)
+     [Richard Levitte]
+
+  *) Make it so the openssl application has all engines loaded by default.
+     [Richard Levitte]
+
+  *) Constify the BIGNUM routines a little more.
+     [Richard Levitte]
+
   *) Make sure that shared libraries get the internal name engine with
      the full version number and not just 0.  This should mark the
      shared libraries as not backward compatible.  Of course, this should