BN_MONT_CTX_new() allocates and initializes a B<BN_MONT_CTX> structure.
BN_MONT_CTX_init() initializes an existing uninitialized B<BN_MONT_CTX>.
-BN_MONT_CTX_set() sets up the B<mont> structure from the modulus B<m>
+BN_MONT_CTX_set() sets up the I<mont> structure from the modulus I<m>
by precomputing its inverse and a value R.
-BN_MONT_CTX_copy() copies the B<N_MONT_CTX> B<from> to B<to>.
+BN_MONT_CTX_copy() copies the B<BN_MONT_CTX> I<from> to I<to>.
BN_MONT_CTX_free() frees the components of the B<BN_MONT_CTX>, and, if
it was created by BN_MONT_CTX_new(), also the structure itself.
-BN_mod_mul_montgomery() computes Mont(B<a>,B<b>):=B<a>*B<b>*R^-1 and places
-the result in B<r>.
+BN_mod_mul_montgomery() computes Mont(I<a>,I<b>):=I<a>*I<b>*R^-1 and places
+the result in I<r>.
-BN_from_montgomery() performs the Montgomery reduction
B<r> = B<a>*R^-1.
+BN_from_montgomery() performs the Montgomery reduction
I<r> = I<a>*R^-1.
-BN_to_montgomery() computes Mont(B<a>,R^2).
+BN_to_montgomery() computes Mont(I<a>,R^2), i.e. I<a>*R.
+Note that I<a> must be non-negative and smaller than the modulus.
-For all functions, B<ctx> is a previously allocated B<BN_CTX> used for
+For all functions, I<ctx> is a previously allocated B<BN_CTX> used for
temporary variables.
The B<BN_MONT_CTX> structure is defined as follows:
For the other functions, 1 is returned for success, 0 on error.
The error codes can be obtained by L<ERR_get_error(3)|ERR_get_error(3)>.
+=head1 WARNING
+
+The inputs must be reduced modulo B<m>, otherwise the result will be
+outside the expected range.
+
=head1 SEE ALSO
L<bn(3)|bn(3)>, L<err(3)|err(3)>, L<BN_add(3)|BN_add(3)>,
projects / openssl.git / blobdiff