OpenSSL CHANGES
_______________
- Changes between 0.9.7 and 0.9.8 [xx XXX 2002]
+ Changes between 0.9.7a and 0.9.7b [xx XXX 2003]
- *) Extend the BIGNUM API by creating new macros that behave like
- functions
-
- void BN_set_sign(BIGNUM *a, int neg);
- int BN_get_sign(const BIGNUM *a);
-
- and avoid the need to access 'a->neg' directly in applications.
- [Nils Larsch <nla@trustcenter.de>]
-
- *) Implement fast modular reduction for pseudo-Mersenne primes
- used in NIST curves (crypto/bn/bn_nist.c, crypto/ec/ecp_nist.c).
- EC_GROUP_new_curve_GFp() will now automatically use this
- if applicable.
- [Nils Larsch <nla@trustcenter.de>]
-
- *) Add new lock type (CRYPTO_LOCK_BN).
- [Bodo Moeller]
-
- *) Change the ENGINE framework to automatically load engines
- dynamically from specific directories unless they could be
- found to already be built in or loaded. Move all the
- current engines except for the cryptodev one to a new
- directory engines/.
- The engines in engines/ are built as shared libraries if
- the "shared" options was given to ./Configure or ./config.
- Otherwise, they are inserted in libcrypto.a.
- /usr/local/ssl/engines is the default directory for dynamic
- engines, but that can be overriden at configure time through
- the usual use of --prefix and/or --openssldir, and at run
- time with the environment variable OPENSSL_ENGINES.
- [Geoff Thorpe and Richard Levitte]
-
- *) Add Makefile.shared, a helper makefile to build shared
- libraries. Addapt Makefile.org.
- [Richard Levitte]
-
- *) Add version info to Win32 DLLs.
- [Peter 'Luna' Runestig" <peter@runestig.com>]
-
- *) Add new 'medium level' PKCS#12 API. Certificates and keys
- can be added using this API to created arbitrary PKCS#12
- files while avoiding the low level API.
-
- New options to PKCS12_create(), key or cert can be NULL and
- will then be omitted from the output file. The encryption
- algorithm NIDs can be set to -1 for no encryption, the mac
- iteration count can be set to 0 to omit the mac.
-
- Enhance pkcs12 utility by making the -nokeys and -nocerts
- options work when creating a PKCS#12 file. New option -nomac
- to omit the mac, NONE can be set for an encryption algorithm.
- New code is modified to use the enhanced PKCS12_create()
- instead of the low level API.
- [Steve Henson]
-
- *) Extend ASN1 encoder to support indefinite length constructed
- encoding. This can output sequences tags and octet strings in
- this form. Modify pk7_asn1.c to support indefinite length
- encoding. This is experimental and needs additional code to
- be useful, such as an ASN1 bio and some enhanced streaming
- PKCS#7 code.
-
- Extend template encode functionality so that tagging is passed
- down to the template encoder.
- [Steve Henson]
-
- *) Let 'openssl req' fail if an argument to '-newkey' is not
- recognized instead of using RSA as a default.
+ *) Countermeasure against the Klima-Pokorny-Rosa extension of
+ Bleichbacher's attack on PKCS #1 v1.5 padding: treat
+ a protocol version number mismatch like a decryption error
+ in ssl3_get_client_key_exchange (ssl/s3_srvr.c).
[Bodo Moeller]
- *) 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/.
-TODO: more general interface (return x coordinate, not its hash)
-TODO: bug: pad x with leading zeros if necessary
- [Douglas Stebila (Sun Microsystems Laboratories)]
+ *) Turn on RSA blinding by default in the default implementation
+ to avoid a timing attack. Applications that don't want it can call
+ RSA_blinding_off() or use the new flag RSA_FLAG_NO_BLINDING.
+ They would be ill-advised to do so in most cases.
+ [Ben Laurie, Steve Henson, Geoff Thorpe]
- *) Let BN_rand_range() abort with an error after 100 iterations
- without success (which indicates a broken PRNG).
+ *) Change RSA blinding code so that it works when the PRNG is not
+ seeded (in this case, the secret RSA exponent is abused as
+ an unpredictable seed -- if it is not unpredictable, there
+ is no point in blinding anyway).
[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:
+ *) Fixed a typo bug that would cause ENGINE_set_default() to set an
+ ENGINE as defaults for all supported algorithms irrespective of
+ the 'flags' parameter. 'flags' is now honoured, so applications
+ should make sure they are passing it correctly.
+ [Geoff Thorpe]
- 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
+ *) Target "mingw" now allows native Windows code to be generated in
+ the Cygwin environment as well as with the MinGW compiler.
+ [Ulf Moeller]
- Point compression for binary fields is disabled by default for
- patent reasons (compile with OPENSSL_EC_BIN_PT_COMP defined to
- enable it).
+ Changes between 0.9.7 and 0.9.7a [19 Feb 2003]
- 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.)
+ *) In ssl3_get_record (ssl/s3_pkt.c), minimize information leaked
+ via timing by performing a MAC computation even if incorrrect
+ block cipher padding has been found. This is a countermeasure
+ against active attacks where the attacker has to distinguish
+ between bad padding and a MAC verification error. (CAN-2003-0078)
- An internal 'field_div' method (similar to 'field_mul' and
- 'field_sqr') has been added; this is used only for binary fields.
+ [Bodo Moeller; problem pointed out by Brice Canvel (EPFL),
+ Alain Hiltgen (UBS), Serge Vaudenay (EPFL), and
+ Martin Vuagnoux (EPFL, Ilion)]
- [Sheueling Chang Shantz and Douglas Stebila
- (Sun Microsystems Laboratories)]
+ *) Make the no-err option work as intended. The intention with no-err
+ is not to have the whole error stack handling routines removed from
+ libcrypto, it's only intended to remove all the function name and
+ reason texts, thereby removing some of the footprint that may not
+ be interesting if those errors aren't displayed anyway.
- *) Optionally dispatch EC_POINT_mul(), EC_POINT_precompute_mult()
- through methods ('mul', 'precompute_mult').
+ NOTE: it's still possible for any application or module to have it's
+ own set of error texts inserted. The routines are there, just not
+ used by default when no-err is given.
+ [Richard Levitte]
- The generic implementations (now internally called 'ec_wNAF_mul'
- and 'ec_wNAF_precomputed_mult') remain the default if these
- methods are undefined.
+ *) Add support for FreeBSD on IA64.
+ [dirk.meyer@dinoex.sub.org via Richard Levitte, resolves #454]
- [Sheueling Chang Shantz and Douglas Stebila
- (Sun Microsystems Laboratories)]
+ *) Adjust DES_cbc_cksum() so it returns the same value as the MIT
+ Kerberos function mit_des_cbc_cksum(). Before this change,
+ the value returned by DES_cbc_cksum() was like the one from
+ mit_des_cbc_cksum(), except the bytes were swapped.
+ [Kevin Greaney <Kevin.Greaney@hp.com> and Richard Levitte]
- *) 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.
+ *) Allow an application to disable the automatic SSL chain building.
+ Before this a rather primitive chain build was always performed in
+ ssl3_output_cert_chain(): an application had no way to send the
+ correct chain if the automatic operation produced an incorrect result.
- [Sheueling Chang Shantz and Douglas Stebila
- (Sun Microsystems Laboratories)]
+ Now the chain builder is disabled if either:
- *) New functions EC_GROUP_dup, EC_POINT_dup.
- (These simply call ..._new and ..._copy).
+ 1. Extra certificates are added via SSL_CTX_add_extra_chain_cert().
- [Sheueling Chang Shantz and Douglas Stebila
- (Sun Microsystems Laboratories)]
+ 2. The mode flag SSL_MODE_NO_AUTO_CHAIN is set.
- *) 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]:
+ The reasoning behind this is that an application would not want the
+ auto chain building to take place if extra chain certificates are
+ present and it might also want a means of sending no additional
+ certificates (for example the chain has two certificates and the
+ root is omitted).
+ [Steve Henson]
- 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]
+ *) Add the possibility to build without the ENGINE framework.
+ [Steven Reddie <smr@essemer.com.au> via Richard Levitte]
- (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:
+ *) Under Win32 gmtime() can return NULL: check return value in
+ OPENSSL_gmtime(). Add error code for case where gmtime() fails.
+ [Steve Henson]
- 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 <douglas.stebila@sun.com>]
-
- *) 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 <nla@trustcenter.de>]
+ *) DSA routines: under certain error conditions uninitialized BN objects
+ could be freed. Solution: make sure initialization is performed early
+ enough. (Reported and fix supplied by Ivan D Nestlerode <nestler@MIT.EDU>,
+ Nils Larsch <nla@trustcenter.de> via PR#459)
+ [Lutz Jaenicke]
- *) 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 <nla@trustcenter.de>]
+ *) Another fix for SSLv2 session ID handling: the session ID was incorrectly
+ checked on reconnect on the client side, therefore session resumption
+ could still fail with a "ssl session id is different" error. This
+ behaviour is masked when SSL_OP_ALL is used due to
+ SSL_OP_MICROSOFT_SESS_ID_BUG being set.
+ Behaviour observed by Crispin Flowerday <crispin@flowerday.cx> as
+ followup to PR #377.
+ [Lutz Jaenicke]
- *) 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 <nla@trustcenter.de>]
+ *) IA-32 assembler support enhancements: unified ELF targets, support
+ for SCO/Caldera platforms, fix for Cygwin shared build.
+ [Andy Polyakov]
- *) 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 <nla@trustcenter.de>]
+ *) Add support for FreeBSD on sparc64. As a consequence, support for
+ FreeBSD on non-x86 processors is separate from x86 processors on
+ the config script, much like the NetBSD support.
+ [Richard Levitte & Kris Kennaway <kris@obsecurity.org>]
- *) 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 <nla@trustcenter.de> with input by Bodo Moeller]
+ Changes between 0.9.6h and 0.9.7 [31 Dec 2002]
- *) 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]
+ *) Fix session ID handling in SSLv2 client code: the SERVER FINISHED
+ code (06) was taken as the first octet of the session ID and the last
+ octet was ignored consequently. As a result SSLv2 client side session
+ caching could not have worked due to the session ID mismatch between
+ client and server.
+ Behaviour observed by Crispin Flowerday <crispin@flowerday.cx> as
+ PR #377.
+ [Lutz Jaenicke]
- *) Add a function EC_GROUP_check_discriminant() (defined via
- EC_METHOD) that verifies that the curve discriminant is non-zero.
+ *) Change the declaration of needed Kerberos libraries to use EX_LIBS
+ instead of the special (and badly supported) LIBKRB5. LIBKRB5 is
+ removed entirely.
+ [Richard Levitte]
- 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 <nla@trustcenter.de>]
+ *) The hw_ncipher.c engine requires dynamic locks. Unfortunately, it
+ seems that in spite of existing for more than a year, many application
+ author have done nothing to provide the necessary callbacks, which
+ means that this particular engine will not work properly anywhere.
+ This is a very unfortunate situation which forces us, in the name
+ of usability, to give the hw_ncipher.c a static lock, which is part
+ of libcrypto.
+ NOTE: This is for the 0.9.7 series ONLY. This hack will never
+ appear in 0.9.8 or later. We EXPECT application authors to have
+ dealt properly with this when 0.9.8 is released (unless we actually
+ make such changes in the libcrypto locking code that changes will
+ have to be made anyway).
+ [Richard Levitte]
- *) Add ECDSA in new directory crypto/ecdsa/.
+ *) In asn1_d2i_read_bio() repeatedly call BIO_read() until all content
+ octets have been read, EOF or an error occurs. Without this change
+ some truncated ASN1 structures will not produce an error.
+ [Steve Henson]
- Add applications 'openssl ecparam' and 'openssl ecdsa'
- (these are based on 'openssl dsaparam' and 'openssl dsa').
+ *) Disable Heimdal support, since it hasn't been fully implemented.
+ Still give the possibility to force the use of Heimdal, but with
+ warnings and a request that patches get sent to openssl-dev.
+ [Richard Levitte]
- 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 <nla@trustcenter.de>]
+ *) Add the VC-CE target, introduce the WINCE sysname, and add
+ INSTALL.WCE and appropriate conditionals to make it build.
+ [Steven Reddie <smr@essemer.com.au> via Richard Levitte]
- *) 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_nid(),
- 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_nid()
- EC_GROUP_get_nid()
- [Nils Larsch <nla@trustcenter.de, Bodo Moeller]
-
- Changes between 0.9.6h and 0.9.7 [XX xxx 2002]
+ *) Change the DLL names for Cygwin to cygcrypto-x.y.z.dll and
+ cygssl-x.y.z.dll, where x, y and z are the major, minor and
+ edit numbers of the version.
+ [Corinna Vinschen <vinschen@redhat.com> and Richard Levitte]
*) Introduce safe string copy and catenation functions
(BUF_strlcpy() and BUF_strlcat()).
*) Avoid filename truncation in cert requests.
[Ben Laurie (CHATS)]
- *) New OPENSSL_assert() macro (similar to assert(), but enabled
- unconditionally).
- [Ben Laurie (CHATS)]
-
*) Add assertions to check for (supposedly impossible) buffer
overflows.
[Ben Laurie (CHATS)]
overflowing internal buffers by having large block sizes, etc.
[Ben Laurie (CHATS)]
+ *) New OPENSSL_assert() macro (similar to assert(), but enabled
+ unconditionally).
+ [Ben Laurie (CHATS)]
+
*) Eliminate unused copy of key in RC4.
[Ben Laurie (CHATS)]
# is assumed to contain the absolute OpenSSL source directory.
mkdir -p objtree/"`uname -s`-`uname -r`-`uname -m`"
cd objtree/"`uname -s`-`uname -r`-`uname -m`"
- (cd $OPENSSL_SOURCE; find . -type f -o -type l) | while read F; do
+ (cd $OPENSSL_SOURCE; find . -type f) | while read F; do
mkdir -p `dirname $F`
ln -s $OPENSSL_SOURCE/$F $F
done
be reduced modulo m.
[Lenka Fibikova <fibikova@exp-math.uni-essen.de>, Bodo Moeller]
+#if 0
+ The following entry accidentily appeared in the CHANGES file
+ distributed with OpenSSL 0.9.7. The modifications described in
+ it do *not* apply to OpenSSL 0.9.7.
+
*) 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
bn_sub_words() and bn_add_words() except they take arrays with
differing sizes.
[Richard Levitte]
+#endif
*) In 'openssl passwd', verify passwords read from the terminal
unless the '-salt' option is used (which usually means that
*) Clean old EAY MD5 hack from e_os.h.
[Richard Levitte]
- Changes between 0.9.6g and 0.9.6h [xx XXX xxxx]
+ Changes between 0.9.6h and 0.9.6i [19 Feb 2003]
+
+ *) In ssl3_get_record (ssl/s3_pkt.c), minimize information leaked
+ via timing by performing a MAC computation even if incorrrect
+ block cipher padding has been found. This is a countermeasure
+ against active attacks where the attacker has to distinguish
+ between bad padding and a MAC verification error. (CAN-2003-0078)
+
+ [Bodo Moeller; problem pointed out by Brice Canvel (EPFL),
+ Alain Hiltgen (UBS), Serge Vaudenay (EPFL), and
+ Martin Vuagnoux (EPFL, Ilion)]
+
+ Changes between 0.9.6g and 0.9.6h [5 Dec 2002]
+
+ *) New function OPENSSL_cleanse(), which is used to cleanse a section of
+ memory from it's contents. This is done with a counter that will
+ place alternating values in each byte. This can be used to solve
+ two issues: 1) the removal of calls to memset() by highly optimizing
+ compilers, and 2) cleansing with other values than 0, since those can
+ be read through on certain media, for example a swap space on disk.
+ [Geoff Thorpe]
+
+ *) Bugfix: client side session caching did not work with external caching,
+ because the session->cipher setting was not restored when reloading
+ from the external cache. This problem was masked, when
+ SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG (part of SSL_OP_ALL) was set.
+ (Found by Steve Haslam <steve@araqnid.ddts.net>.)
+ [Lutz Jaenicke]
+
+ *) Fix client_certificate (ssl/s2_clnt.c): The permissible total
+ length of the REQUEST-CERTIFICATE message is 18 .. 34, not 17 .. 33.
+ [Zeev Lieber <zeev-l@yahoo.com>]
+
+ *) Undo an undocumented change introduced in 0.9.6e which caused
+ repeated calls to OpenSSL_add_all_ciphers() and
+ OpenSSL_add_all_digests() to be ignored, even after calling
+ EVP_cleanup().
+ [Richard Levitte]
+
+ *) Change the default configuration reader to deal with last line not
+ being properly terminated.
+ [Richard Levitte]
*) Change X509_NAME_cmp() so it applies the special rules on handling
DN values that are of type PrintableString, as well as RDNs of type
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