#include <openssl/bn.h>
BN_MONT_CTX *BN_MONT_CTX_new(void);
- void BN_MONT_CTX_init(BN_MONT_CTX *ctx);
void BN_MONT_CTX_free(BN_MONT_CTX *mont);
int BN_MONT_CTX_set(BN_MONT_CTX *mont, const BIGNUM *m, BN_CTX *ctx);
using the same modulus.
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 I<mont> structure from the modulus I<m>
by precomputing its inverse and a value R.
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:
-
- typedef struct bn_mont_ctx_st
- {
- int ri; /* number of bits in R */
- BIGNUM RR; /* R^2 (used to convert to Montgomery form) */
- BIGNUM N; /* The modulus */
- BIGNUM Ni; /* R*(1/R mod N) - N*Ni = 1
- * (Ni is only stored for bignum algorithm) */
- BN_ULONG n0; /* least significant word of Ni */
- int flags;
- } BN_MONT_CTX;
-
-BN_to_montgomery() is a macro.
-
=head1 RETURN VALUES
BN_MONT_CTX_new() returns the newly allocated B<BN_MONT_CTX>, and NULL
on error.
-BN_MONT_CTX_init() and BN_MONT_CTX_free() have no return values.
+BN_MONT_CTX_free() has no return value.
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)>.
The inputs must be reduced modulo B<m>, otherwise the result will be
outside the expected range.
+=head1 REMOVED FUNCTIONALITY
+
+ void BN_MONT_CTX_init(BN_MONT_CTX *c);
+
+BN_MONT_CTX_init() is no longer available as of OpenSSL 1.1.0. It was used to
+initialize an existing uninitialized B<BN_MONT_CTX>. Typically this would be
+done as follows:
+
+ BN_MONT_CTX ctx;
+ BN_MONT_CTX_init(&ctx);
+
+Instead applications should create a BN_MONT_CTX structure using
+BN_MONT_CTX_new:
+
+ BN_MONT_CTX *ctx;
+ ctx = BN_MONT_CTX_new();
+ if(!ctx) /* handle error */
+ ...
+ BN_MONT_CTX_free(ctx);
+
=head1 SEE ALSO
L<bn(3)|bn(3)>, L<ERR_get_error(3)|ERR_get_error(3)>, L<BN_add(3)|BN_add(3)>,
are available in all versions of SSLeay and OpenSSL.
BN_MONT_CTX_init() and BN_MONT_CTX_copy() were added in SSLeay 0.9.1b.
+BN_MONT_CTX_init was removed in OpenSSL 1.1.0
=cut