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Diffstat (limited to 'man3/libkeccak_degeneralise_spec.3')
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diff --git a/man3/libkeccak_degeneralise_spec.3 b/man3/libkeccak_degeneralise_spec.3 new file mode 100644 index 0000000..38a1b73 --- /dev/null +++ b/man3/libkeccak_degeneralise_spec.3 @@ -0,0 +1,124 @@ +.TH LIBKECCAK_DEGENERALISE_SPEC 3 LIBKECCAK +.SH NAME +libkeccak_degeneralise_spec - Set all specification parameters to automatic +.SH SYNOPSIS +.LP +.nf +#include <libkeccak.h> +.P +int +libkeccak_degeneralise_spec(libkeccak_generalised_spec_t *\fIspec\fP, + libkeccak_spec_t *\fIoutput_spec\fP); +.fi +.P +Link with +.IR -lkeccak . +.SH DESCRIPTION +The +.BR libkeccak_degeneralise_spec () +function will resolve automatic parameters in +.I *spec +and translates the parameters to +.IR *output_spec , +so that it can be used for hashing. +.PP +The function will modify both +.I *spec +and +.IR *output_spec . +.PP +You should call the +.BR libkeccak_spec_check (3) +function after calling +.BR libkeccak_degeneralise_spec (). +.PP +.nf +typedef struct libkeccak_generalised_spec { + long int bitrate; /* bitrate (in bits) */ + long int capacity; /* capacity (in bits) */ + long int output; /* output size (in bits) */ + long int state_size; /* state size (in bits) */ + long int word_size; /* word size (in bits) */ +} libkeccak_generalised_spec_t; +.fi +.SH RETURN VALUES +The +.BR libkeccak_degeneralise_spec () +function returns 0 if the settings are usable. Otherwise +it will return one of the following constants. +.PP +.TP +.B LIBKECCAK_GENERALISED_SPEC_ERROR_STATE_NONPOSITIVE +The specified state size is non-positive. +.TP +.B LIBKECCAK_GENERALISED_SPEC_ERROR_STATE_TOO_LARGE +The specified state size exceeded the supported limit +(currently at 1600 bits.) +.TP +.B LIBKECCAK_GENERALISED_SPEC_ERROR_STATE_MOD_25 +The specified state size, in bits, was not equivalent +to 0 modulus 25. Meaning the state size cannot +cover all lanes equivalently. +.TP +.B LIBKECCAK_GENERALISED_SPEC_ERROR_WORD_NONPOSITIVE +The specified word size is non-positive. +.TP +.B LIBKECCAK_GENERALISED_SPEC_ERROR_WORD_TOO_LARGE +The specified word size exceeded the supported limit +(currently at 64 bits.) +.TP +.B LIBKECCAK_GENERALISED_SPEC_ERROR_STATE_WORD_INCOHERENCY +The specified state size is not exactly 25 times larger +than the word size. +.TP +.B LIBKECCAK_GENERALISED_SPEC_ERROR_CAPACITY_NONPOSITIVE +The specified capacity was non-positive. +.TP +.B LIBKECCAK_GENERALISED_SPEC_ERROR_CAPACITY_MOD_8 +The specified capacity was not equivalent to 0 +modulus 8, that is, it was not in whole bytes. +.TP +.B LIBKECCAK_GENERALISED_SPEC_ERROR_BITRATE_NONPOSITIVE +The specified bitrate was non-positive. +.TP +.B LIBKECCAK_GENERALISED_SPEC_ERROR_BITRATE_MOD_8 +The specified bitrate was not equivalent to 0 +modulus 8, that is, it was not in whole bytes. +.TP +.B LIBKECCAK_GENERALISED_SPEC_ERROR_OUTPUT_NONPOSITIVE +The specified output size was non-positive. +.PP +Note that there may be more than one error. Only the first +detected is returned. +.SH ERRORS +The +.BR libkeccak_degeneralise_spec () +function cannot fail. +.fi +.SH EXAMPLE +This examples configure a +.B libkeccak_spec_t +to specify settings for Keccak[c = 512]: +.LP +.nf +int r; +libkeccak_spec_t spec; +libkeccak_generalised_spec_t gspec; +libkeccak_generalised_spec_initialise(&gspec); +gspec.capacity = 512; +if ((r = libkeccak_degeneralise_spec(&gspec, &spec))) + goto fail_degeneralise_spec; +if ((r = libkeccak_spec_check(&spec))); + goto fail_spec_check; +.fi +.SH SEE ALSO +.BR libkeccak_generalised_spec_initialise (3), +.BR libkeccak_spec_check (3), +.BR libkeccak_spec_sha3 (3), +.BR libkeccak_spec_rawshake (3), +.BR libkeccak_spec_shake (3), +.BR libkeccak_state_initialise (3), +.BR libkeccak_hmac_initialise (3) +.SH BUGS +Please report bugs to https://github.com/maandree/libkeccak/issues or to +maandree@kth.se |