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75 lines
1.9 KiB
Plaintext
75 lines
1.9 KiB
Plaintext
=pod
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=encoding utf8
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=head1 NAME
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OTP_generate - One-Time Password Algorithm
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=head1 SYNOPSIS
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#include <openssl/otp.h>
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typedef struct OTP_PARAMS_st {
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int type;
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int te;
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void *option;
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size_t option_size;
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int otp_digits;
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/* adjust the clock in seconds */
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int offset;
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} OTP_PARAMS;
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int OTP_generate(const OTP_PARAMS *params,
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const void *event, size_t eventlen,
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unsigned int *otp,
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const unsigned char *key, size_t keylen);
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=head1 DESCRIPTION
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Applications should use the higher level functions
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L<EVP_DigestInit(3)> etc. instead of calling the hash
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functions directly.
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SM3 (ShangMi#3 Hash Algorithm) is a cryptographic hash function with a
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256 bit output.
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sm3() computes the SM3 message digest of the B<n>
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bytes at B<d> and places it in B<md> (which must have space for
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SHA_DIGEST_LENGTH == 20 bytes of output). If B<md> is NULL, the digest
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is placed in a static array. Note: setting B<md> to NULL is B<not thread safe>.
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The following functions may be used if the message is not completely
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stored in memory:
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sm3_nit() initializes a B<sm3_ctx_t> structure.
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sm3_update() can be called repeatedly with chunks of the message to
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be hashed (B<len> bytes at B<data>).
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sm3_final() places the message digest in B<md>, which must have space
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for SM3_DIGEST_LENGTH == 32 bytes of output, and erases the B<sm3_ctx_t>.
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=head1 RETURN VALUES
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sm3_init(), sm3_update(), sm3_final(), sm3_compress() and sm3() return void.
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=head1 CONFORMING TO
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GM/T 0004-2012 SM3 Cryptogrpahic Hash Algorithm.
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=head1 SEE ALSO
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L<EVP_DigestInit(3)>
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=head1 COPYRIGHT
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Copyright 2014-2019 The GmSSL Project. All Rights Reserved.
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Licensed under the GmSSL license (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<http://gmssl.org/license.html>.
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=cut
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