changes

mediastreamer2是开源的网络传输媒体流的库

  *) Add support for ECC-based ciphersuites from draft-ietf-tls-ecc-01.txt.
     As these are not official, they are not included in "ALL";
     the "ECCdraft" ciphersuite group alias can be used to select them.
     [Vipul Gupta and Sumit Gupta (Sun Microsystems Laboratories)]

  *) Add ECDH engine support.
     [Nils Gura and Douglas Stebila (Sun Microsystems Laboratories)]

  *) Add ECDH in new directory crypto/ecdh/.
     [Douglas Stebila (Sun Microsystems Laboratories)]

  *) Let BN_rand_range() abort with an error after 100 iterations
     without success (which indicates a broken PRNG).
     [Bodo Moeller]

  *) Change BN_mod_sqrt() so that it verifies that the input value
     is really the square of the return value.  (Previously,
     BN_mod_sqrt would show GIGO behaviour.)
     [Bodo Moeller]

  *) Add named elliptic curves over binary fields from X9.62, SECG,
     and WAP/WTLS; add OIDs that were still missing.

     [Sheueling Chang Shantz and Douglas Stebila
     (Sun Microsystems Laboratories)]

  *) Extend the EC library for elliptic curves over binary fields
     (new files ec2_smpl.c, ec2_smpt.c, ec2_mult.c in crypto/ec/).
     New EC_METHOD:

          EC_GF2m_simple_method

     New API functions:

          EC_GROUP_new_curve_GF2m
          EC_GROUP_set_curve_GF2m
          EC_GROUP_get_curve_GF2m
          EC_POINT_set_affine_coordinates_GF2m
          EC_POINT_get_affine_coordinates_GF2m
          EC_POINT_set_compressed_coordinates_GF2m

     Point compression for binary fields is disabled by default for
     patent reasons (compile with OPENSSL_EC_BIN_PT_COMP defined to
     enable it).

     As binary polynomials are represented as BIGNUMs, various members
     of the EC_GROUP and EC_POINT data structures can be shared
     between the implementations for prime fields and binary fields;
     the above ..._GF2m functions (except for EX_GROUP_new_curve_GF2m)
     are essentially identical to their ..._GFp counterparts.
     (For simplicity, the '..._GFp' prefix has been dropped from
     various internal method names.)

     An internal 'field_div' method (similar to 'field_mul' and
     'field_sqr') has been added; this is used only for binary fields.

     [Sheueling Chang Shantz and Douglas Stebila
     (Sun Microsystems Laboratories)]

  *) Optionally dispatch EC_POINT_mul(), EC_POINT_precompute_mult()
     through methods ('mul', 'precompute_mult').

     The generic implementations (now internally called 'ec_wNAF_mul'
     and 'ec_wNAF_precomputed_mult') remain the default if these
     methods are undefined.

     [Sheueling Chang Shantz and Douglas Stebila
     (Sun Microsystems Laboratories)]

  *) New function EC_GROUP_get_degree, which is defined through
     EC_METHOD.  For curves over prime fields, this returns the bit
     length of the modulus.

     [Sheueling Chang Shantz and Douglas Stebila
     (Sun Microsystems Laboratories)]

  *) New functions EC_GROUP_dup, EC_POINT_dup.
     (These simply call ..._new  and ..._copy).

     [Sheueling Chang Shantz and Douglas Stebila
     (Sun Microsystems Laboratories)]

  *) Add binary polynomial arithmetic software in crypto/bn/bn_gf2m.c.
     Polynomials are represented as BIGNUMs (where the sign bit is not
     used) in the following functions [macros]:  

          BN_GF2m_add
          BN_GF2m_sub             [= BN_GF2m_add]
          BN_GF2m_mod             [wrapper for BN_GF2m_mod_arr]
          BN_GF2m_mod_mul         [wrapper for BN_GF2m_mod_mul_arr]
          BN_GF2m_mod_sqr         [wrapper for BN_GF2m_mod_sqr_arr]
          BN_GF2m_mod_inv
          BN_GF2m_mod_exp         [wrapper for BN_GF2m_mod_exp_arr]
          BN_GF2m_mod_sqrt        [wrapper for BN_GF2m_mod_sqrt_arr]
          BN_GF2m_mod_solve_quad  [wrapper for BN_GF2m_mod_solve_quad_arr]
          BN_GF2m_cmp             [= BN_ucmp]

     (Note that only the 'mod' functions are actually for fields GF(2^m).
     BN_GF2m_add() is misnomer, but this is for the sake of consistency.)

     For some functions, an the irreducible polynomial defining a
     field can be given as an 'unsigned int[]' with strictly
     decreasing elements giving the indices of those bits that are set;
     i.e., p[] represents the polynomial
          f(t) = t^p[0] + t^p[1] + ... + t^p[k]
     where
          p[0] > p[1] > ... > p[k] = 0.
     This applies to the following functions:

          BN_GF2m_mod_arr
          BN_GF2m_mod_mul_arr
          BN_GF2m_mod_sqr_arr
          BN_GF2m_mod_inv_arr        [wrapper for BN_GF2m_mod_inv]
          BN_GF2m_mod_div_arr        [wrapper for BN_GF2m_mod_div]
          BN_GF2m_mod_exp_arr
          BN_GF2m_mod_sqrt_arr
          BN_GF2m_mod_solve_quad_arr
          BN_GF2m_poly2arr
          BN_GF2m_arr2poly

     Conversion can be performed by the following functions:

          BN_GF2m_poly2arr
          BN_GF2m_arr2poly

     bntest.c has additional tests for binary polynomial arithmetic.

     Two implementations for BN_GF2m_mod_div() are available.
     The default algorithm simply uses BN_GF2m_mod_inv() and
     BN_GF2m_mod_mul().  The alternative algorithm is compiled in only
     if OPENSSL_SUN_GF2M_DIV is defined (patent pending; read the
     copyright notice in crypto/bn/bn_gf2m.c before enabling it).

     [Sheueling Chang Shantz and Douglas Stebila
     (Sun Microsystems Laboratories)]

  *) Add new error code 'ERR_R_DISABLED' that can be used when some
     functionality is disabled at compile-time.
     [Douglas Stebila <[e-mail]>]

  *) Change default behaviour of 'openssl asn1parse' so that more
     information is visible when viewing, e.g., a certificate:

     Modify asn1_parse2 (crypto/asn1/asn1_par.c) so that in non-'dump'
     mode the content of non-printable OCTET STRINGs is output in a
     style similar to INTEGERs, but with '[HEX DUMP]' prepended to
     avoid the appearance of a printable string.
     [Nils Larsch <[e-mail]>]

  *) Add 'asn1_flag' and 'asn1_form' member to EC_GROUP with access
     functions
          EC_GROUP_set_asn1_flag()
          EC_GROUP_get_asn1_flag()
          EC_GROUP_set_point_conversion_form()
          EC_GROUP_get_point_conversion_form()
     These control ASN1 encoding details:
     - Curves (i.e., groups) are encoded explicitly unless asn1_flag
       has been set to OPENSSL_EC_NAMED_CURVE.
     - Points are encoded in uncompressed form by default; options for
       asn1_for are as for point2oct, namely
          POINT_CONVERSION_COMPRESSED
          POINT_CONVERSION_UNCOMPRESSED
          POINT_CONVERSION_HYBRID

     Also add 'seed' and 'seed_len' members to EC_GROUP with access
     functions
          EC_GROUP_set_seed()
          EC_GROUP_get0_seed()
          EC_GROUP_get_seed_len()
     This is used only for ASN1 purposes (so far).
     [Nils Larsch <[e-mail]>]

  *) Add 'field_type' member to EC_METHOD, which holds the NID
     of the appropriate field type OID.  The new function
     EC_METHOD_get_field_type() returns this value.
     [Nils Larsch <[e-mail]>]

  *) Add functions 
          EC_POINT_point2bn()
          EC_POINT_bn2point()
          EC_POINT_point2hex()
          EC_POINT_hex2point()
     providing useful interfaces to EC_POINT_point2oct() and
     EC_POINT_oct2point().
     [Nils Larsch <[e-mail]>]

  *) Change internals of the EC library so that the functions
          EC_GROUP_set_generator()
          EC_GROUP_get_generator()
          EC_GROUP_get_order()
          EC_GROUP_get_cofactor()
     are implemented directly in crypto/ec/ec_lib.c and not dispatched
     to methods, which would lead to unnecessary code duplication when
     adding different types of curves.
     [Nils Larsch <[e-mail]> with input by Bodo Moeller]

  *) Implement compute_wNAF (crypto/ec/ec_mult.c) without BIGNUM
     arithmetic, and such that modified wNAFs are generated
     (which avoid length expansion in many cases).
     [Bodo Moeller]

  *) Add a function EC_GROUP_check_discriminant() (defined via
     EC_METHOD) that verifies that the curve discriminant is non-zero.

     Add a function EC_GROUP_check() that makes some sanity tests
     on a EC_GROUP, its generator and order.  This includes
     EC_GROUP_check_discriminant().
     [Nils Larsch <[e-mail]>]

  *) Add ECDSA in new directory crypto/ecdsa/.

     Add applications 'openssl ecparam' and 'openssl ecdsa'
     (these are based on 'openssl dsaparam' and 'openssl dsa').

     ECDSA support is also included in various other files across the
     library.  Most notably,
     - 'openssl req' now has a '-newkey ecdsa:file' option;
     - EVP_PKCS82PKEY (crypto/evp/evp_pkey.c) now can handle ECDSA;
     - X509_PUBKEY_get (crypto/asn1/x_pubkey.c) and
       d2i_PublicKey (crypto/asn1/d2i_pu.c) have been modified to make
       them suitable for ECDSA where domain parameters must be
       extracted before the specific public key;
     - ECDSA engine support has been added.
     [Nils Larsch <[e-mail]>]

  *) Include some named elliptic curves, and add OIDs from X9.62,
     SECG, and WAP/WTLS.  Each curve can be obtained from the new
     function
          EC_GROUP_new_by_curve_name(),
     and the list of available named curves can be obtained with
          EC_get_builtin_curves().
     Also add a 'curve_name' member to EC_GROUP objects, which can be
     accessed via
         EC_GROUP_set_curve_name()
         EC_GROUP_get_curve_name()
     [Nils Larsch <[e-mail], 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 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]

 Changes between 0.9.7g and 0.9.7h  [11 Oct 2005]

  *) Remove the functionality of SSL_OP_MSIE_SSLV2_RSA_PADDING
     (part of SSL_OP_ALL).  This option used to disable the
     countermeasure against man-in-the-middle protocol-version
     rollback in the SSL 2.0 server implementation, which is a bad
     idea.

     [Bodo Moeller; problem pointed out by Yutaka Oiwa (Research Center
     for Information Security, National Institute of Advanced Industrial
     Science and Technology [AIST], Japan)]

  *) Minimal support for X9.31 signatures and PSS padding modes. This is
     mainly for FIPS compliance and not fully integrated at this stage.
     [Steve Henson]

  *) For DSA signing, unless DSA_FLAG_NO_EXP_CONSTTIME is set, perform
     the exponentiation using a fixed-length exponent.  (Otherwise,
     the information leaked through timing could expose the secret key
     after many signatures; cf. Bleichenbacher's attack on DSA with
     biased k.)
     [Bodo Moeller]

  *) Make a new fixed-window mod_exp implementation the default for
     RSA, DSA, and DH private-key operations so that the sequence of
     squares and multiplies and the memory access pattern are
     independent of the particular secret key.  This will mitigate
     cache-timing and potential related attacks.

     BN_mod_exp_mont_consttime() is the new exponentiation implementation,
     and this is automatically used by BN_mod_exp_mont() if the new flag
     BN_FLG_EXP_CONSTTIME is set for the exponent.  RSA, DSA, and DH
     will use this BN flag for private exponents unless the flag
     RSA_FLAG_NO_EXP_CONSTTIME, DSA_FLAG_NO_EXP_CONSTTIME, or
     DH_FLAG_NO_EXP_CONSTTIME, respectively, is set.

     [Matthew D Wood (Intel Corp), with some changes by Bodo Moeller]

  *) Change the client implementation for SSLv23_method() and
     SSLv23_client_method() so that is uses the SSL 3.0/TLS 1.0
     Client Hello message format if the SSL_OP_NO_SSLv2 option is set.
     (Previously, the SSL 2.0 backwards compatible Client Hello
     message format would be used even with SSL_OP_NO_SSLv2.)
     [Bodo Moeller]

  *) Add support for smime-type MIME parameter in S/MIME messages which some
     clients need.
     [Steve Henson]

  *) New function BN_MONT_CTX_set_locked() to set montgomery parameters in
     a threadsafe manner. Modify rsa code to use new function and add calls
     to dsa and dh code (which had race conditions before).
     [Steve Henson]

  *) Include the fixed error library code in the C error file definitions
     instead of fixing them up at runtime. This keeps the error code
     structures constant.
     [Steve Henson]

 Changes between 0.9.7f and 0.9.7g  [11 Apr 2005]