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POLY->ASCII: improve modularity

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hasufell 2014-06-02 21:37:04 +02:00
parent 2503fdcfa4
commit 81b570d9a9
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GPG Key ID: 220CD1C5BDEED020
2 changed files with 66 additions and 33 deletions
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83
src/poly_ascii.c
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@ -213,35 +213,7 @@ poly_to_ascii(const fmpz_poly_t poly,
/*------------------------------------------------------------------------*/
string *
poly_to_base64(const fmpz_poly_t poly,
const ntru_context *ctx)
{
string *result_string = ntru_malloc(sizeof(*result_string));
string *string_rep = NULL;
gchar *base64_string = NULL,
*tmp = NULL;
string_rep = poly_to_ascii(poly, ctx);
tmp = g_base64_encode((const guchar *)string_rep->ptr,
string_rep->len);
base64_string = g_base64_encode((const guchar *)tmp,
strlen(tmp));
result_string->ptr = base64_string;
result_string->len = strlen(base64_string);
string_delete(string_rep);
free(tmp);
return result_string;
}
/*------------------------------------------------------------------------*/
string *
poly_arr_to_base64(fmpz_poly_t **poly_array,
poly_arr_to_ascii(fmpz_poly_t **poly_array,
const ntru_context *ctx)
{
fmpz_poly_t *ascii_poly;
@ -250,8 +222,6 @@ poly_arr_to_base64(fmpz_poly_t **poly_array,
string *result_string = ntru_malloc(sizeof(*result_string));
size_t old_length = 0,
new_length;
gchar *base64_string = NULL,
*tmp = NULL;
/*
* parse the polynomial coefficients into a string
@ -276,14 +246,61 @@ poly_arr_to_base64(fmpz_poly_t **poly_array,
string_delete(poly_str);
}
tmp = g_base64_encode((const guchar *)string_rep, string_len);
result_string->ptr = string_rep;
result_string->len = string_len;
return result_string;
}
/*------------------------------------------------------------------------*/
string *
poly_to_base64(const fmpz_poly_t poly,
const ntru_context *ctx)
{
string *result_string = ntru_malloc(sizeof(*result_string));
string *string_rep = NULL;
gchar *base64_string = NULL,
*tmp = NULL;
string_rep = poly_to_ascii(poly, ctx);
tmp = g_base64_encode((const guchar *)string_rep->ptr,
string_rep->len);
base64_string = g_base64_encode((const guchar *)tmp,
strlen(tmp));
result_string->ptr = base64_string;
result_string->len = strlen(base64_string);
free(string_rep);
string_delete(string_rep);
free(tmp);
return result_string;
}
/*------------------------------------------------------------------------*/
string *
poly_arr_to_base64(fmpz_poly_t **poly_array,
const ntru_context *ctx)
{
string *string_rep;
string *result_string = ntru_malloc(sizeof(*result_string));
gchar *base64_string = NULL,
*tmp = NULL;
string_rep = poly_arr_to_ascii(poly_array, ctx);
tmp = g_base64_encode((const guchar *)string_rep->ptr, string_rep->len);
base64_string = g_base64_encode((const guchar *)tmp,
strlen(tmp));
result_string->ptr = base64_string;
result_string->len = strlen(base64_string);
string_delete(string_rep);
free(tmp);
return result_string;

16
src/poly_ascii.h
View File

@ -100,6 +100,22 @@ string *
poly_to_ascii(const fmpz_poly_t poly,
const ntru_context *ctx);
/**
* Convert an array of polynomials back to a real string.
* The polynomial coefficients are expected to be in the range
* [0, q-1] and will be casted back to chars without any mapping.
*
* Trailing q coefficients are only used for filling up the rest of
* a polynomial with '\0', so they will not confuse the result.
*
* @param poly_arr the array of polynomials
* @param ctx the NTRUEncrypt context
* @return the real string, newly allocated
*/
string *
poly_arr_to_ascii(fmpz_poly_t **poly_array,
const ntru_context *ctx);
/**
* Convert a single polynom back to a real string which is
* base64 encoded.