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-=pod
-
-=head1 NAME
-
-SM3_Init,
-SM3_Update,
-SM3_Final
-
-=head1 SYNOPSIS
-
- #include <openssl/sm3.h>
-
- unsigned char *SM3(const unsigned char *d, size_t n, unsigned char *md);
-
- int SM3_Init(SM3_CTX *c);
- int SM3_Update(SM3_CTX *c, const void *data, size_t len);
- int SM3_Final(unsigned char *md, SM3_CTX *c);
-
-=head1 DESCRIPTION
-
-SM3 is a cryptographic hash function with a 256-bit output, defined in GB/T
-32905-2016.
-
-SM3() computes the SM3 message digest of the B<n> bytes at B<d> and places it
-in B<md> (which must have space for SM3_DIGEST_LENGTH == 32 bytes of output).
-If B<md> is NULL, the digest is placed in a static array.
-
-The following functions may be used if the message is not completely stored in
-memory:
-
-SM3_Init() initializes a B<SM3_CTX> structure.
-
-SM3_Update() can be called repeatedly with chunks of the message to be hashed
-(B<len> bytes at B<data>).
-
-SM3_Final() places the message digest in B<md>, which must have space for
-B<SM3_DIGEST_LENGTH> == 32 bytes of output, and erases the B<SM3_CTX>.
-
-=head1 RETURN VALUES
-
-=over 4
-
-=item SM3()
-
-Returns pointers to the hash value.
-
-=item SM3_Init(), SM3_Update(), SM3_Final()
-
-Returns 1 for success, 0 otherwise.
-
-=back
-
-=head1 NOTE
-
-Applications should use the higher level functions such as L<EVP_DigestInit(3)>
-instead of calling these functions directly.
-
-=head1 CONFORMING TO
-
-GB/T 32905-2016 and GM/T 0004-2012.
-
-=head1 SEE ALSO
-
-L<EVP_DigestInit(3)>
-
-=head1 COPYRIGHT
-
-Copyright 2017 The OpenSSL Project Authors. All Rights Reserved.
-Copyright 2017 Ribose Inc. All Rights Reserved.
-
-Licensed under the OpenSSL license (the "License").  You may not use
-this file except in compliance with the License.  You can obtain a copy
-in the file LICENSE in the source distribution or at
-L<https://www.openssl.org/source/license.html>.
-
-=cut