remove dh_export_radix.c dh_import_radix.c
This commit is contained in:
Karel Miko
parent
f4ce5a21c8
commit
5eaff56d90
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/* LibTomCrypt, modular cryptographic library -- Tom St Denis
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*
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* LibTomCrypt is a library that provides various cryptographic
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* algorithms in a highly modular and flexible manner.
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*
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* The library is free for all purposes without any express
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* guarantee it works.
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*/
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#include "tomcrypt.h"
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#ifdef LTC_MDH
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static unsigned long _count_digits(int radix, void *num)
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{
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void *r, *t;
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unsigned long digits = 0;
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if (mp_iszero(num) == LTC_MP_YES) return 1;
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if (mp_init_multi(&t, &r, NULL) != CRYPT_OK) return 0;
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mp_copy(num, t);
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mp_set_int(r, radix);
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while (mp_iszero(t) == LTC_MP_NO) {
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if (mp_div(t, r, t, NULL) != CRYPT_OK) {
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mp_clear_multi(t, r, NULL);
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return 0;
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}
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digits++;
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}
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mp_clear_multi(t, r, NULL);
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return digits;
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}
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/**
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Export a DH key to a binary packet
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@param out [out] The destination for the key
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@param outlen [in/out] The max size and resulting size of the DH key
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@param type Which type of key (PK_PRIVATE or PK_PUBLIC)
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@param key The key you wish to export
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@return CRYPT_OK if successful
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*/
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int dh_export_radix(int radix, void *out, unsigned long *outlen, int type, dh_key *key)
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{
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unsigned long len;
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void *k;
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LTC_ARGCHK(out != NULL);
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LTC_ARGCHK(outlen != NULL);
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LTC_ARGCHK(key != NULL);
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LTC_ARGCHK((radix >= 2 && radix <= 64) || radix == 256);
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k = (type == PK_PRIVATE) ? key->x : key->y;
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len = (radix == 256) ? mp_unsigned_bin_size(k) : _count_digits(radix, k) + 1;
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if (*outlen < len) {
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*outlen = len;
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return CRYPT_BUFFER_OVERFLOW;
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}
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*outlen = len;
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return (radix == 256) ? mp_to_unsigned_bin(k, out) : mp_toradix(k, out, radix);
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}
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#endif /* LTC_MDH */
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/* ref: $Format:%D$ */
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/* git commit: $Format:%H$ */
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/* commit time: $Format:%ai$ */
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@ -1,90 +0,0 @@
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/* LibTomCrypt, modular cryptographic library -- Tom St Denis
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*
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* LibTomCrypt is a library that provides various cryptographic
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* algorithms in a highly modular and flexible manner.
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*
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* The library is free for all purposes without any express
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* guarantee it works.
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*/
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#include "tomcrypt.h"
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#ifdef LTC_MDH
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/**
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Import a DH key from a binary string
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@param in The string to read
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@param inlen The length of the input packet
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@param type The type of key (PK_PRIVATE or PK_PUBLIC)
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@param base The base (generator) in hex string
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@param prime The prime in hex string
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@param key [out] Where to import the key to
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@return CRYPT_OK if successful, on error all allocated memory is freed automatically
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*/
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int dh_import_radix(int radix,
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void *in, unsigned long inlen,
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void *prime, unsigned long primelen,
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void *base, unsigned long baselen,
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int type, dh_key *key)
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{
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int err;
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LTC_ARGCHK(in != NULL);
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LTC_ARGCHK(base != NULL);
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LTC_ARGCHK(prime != NULL);
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LTC_ARGCHK(key != NULL);
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if ((err = mp_init_multi(&key->x, &key->y, &key->base, &key->prime, NULL)) != CRYPT_OK) {
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goto error;
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}
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if (radix == 256) {
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if ((err = mp_read_unsigned_bin(key->base, base, baselen)) != CRYPT_OK) { goto error; }
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if ((err = mp_read_unsigned_bin(key->prime, prime, primelen)) != CRYPT_OK) { goto error; }
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}
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else {
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if ((err = mp_read_radix(key->base, base, radix)) != CRYPT_OK) { goto error; }
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if ((err = mp_read_radix(key->prime, prime, radix)) != CRYPT_OK) { goto error; }
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}
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if (type == PK_PRIVATE) {
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/* load the x value */
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if (radix == 256) {
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if ((err = mp_read_unsigned_bin(key->x, in, inlen)) != CRYPT_OK) { goto error; }
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}
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else {
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if ((err = mp_read_radix(key->x, in, radix)) != CRYPT_OK) { goto error; }
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}
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/* compute y value */
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if ((err = mp_exptmod(key->base, key->x, key->prime, key->y)) != CRYPT_OK) { goto error; }
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key->type = PK_PRIVATE;
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}
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else {
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/* load the y value */
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if (radix == 256) {
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if ((err = mp_read_unsigned_bin(key->y, in, inlen)) != CRYPT_OK) { goto error; }
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}
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else {
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if ((err = mp_read_radix(key->y, in, radix)) != CRYPT_OK) { goto error; }
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}
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key->type = PK_PUBLIC;
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mp_clear(key->x);
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key->x = NULL;
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}
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/* check public key */
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if ((err = dh_check_pubkey(key)) != CRYPT_OK) {
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goto error;
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}
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return CRYPT_OK;
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error:
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mp_clear_multi(key->prime, key->base, key->y, key->x, NULL);
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return err;
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}
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#endif /* LTC_MDH */
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/* ref: $Format:%D$ */
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/* git commit: $Format:%H$ */
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/* commit time: $Format:%ai$ */
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