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author | marha <marha@users.sourceforge.net> | 2009-06-28 22:07:26 +0000 |
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committer | marha <marha@users.sourceforge.net> | 2009-06-28 22:07:26 +0000 |
commit | 3562e78743202e43aec8727005182a2558117eca (patch) | |
tree | 8f9113a77d12470c5c851a2a8e4cb02e89df7d43 /openssl/doc/crypto/BN_mod_mul_montgomery.pod | |
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Diffstat (limited to 'openssl/doc/crypto/BN_mod_mul_montgomery.pod')
-rw-r--r-- | openssl/doc/crypto/BN_mod_mul_montgomery.pod | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/openssl/doc/crypto/BN_mod_mul_montgomery.pod b/openssl/doc/crypto/BN_mod_mul_montgomery.pod new file mode 100644 index 000000000..6b16351b9 --- /dev/null +++ b/openssl/doc/crypto/BN_mod_mul_montgomery.pod @@ -0,0 +1,101 @@ +=pod + +=head1 NAME + +BN_mod_mul_montgomery, BN_MONT_CTX_new, BN_MONT_CTX_init, +BN_MONT_CTX_free, BN_MONT_CTX_set, BN_MONT_CTX_copy, +BN_from_montgomery, BN_to_montgomery - Montgomery multiplication + +=head1 SYNOPSIS + + #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); + BN_MONT_CTX *BN_MONT_CTX_copy(BN_MONT_CTX *to, BN_MONT_CTX *from); + + int BN_mod_mul_montgomery(BIGNUM *r, BIGNUM *a, BIGNUM *b, + BN_MONT_CTX *mont, BN_CTX *ctx); + + int BN_from_montgomery(BIGNUM *r, BIGNUM *a, BN_MONT_CTX *mont, + BN_CTX *ctx); + + int BN_to_montgomery(BIGNUM *r, BIGNUM *a, BN_MONT_CTX *mont, + BN_CTX *ctx); + +=head1 DESCRIPTION + +These functions implement Montgomery multiplication. They are used +automatically when L<BN_mod_exp(3)|BN_mod_exp(3)> is called with suitable input, +but they may be useful when several operations are to be performed +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. + +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(I<a>,I<b>):=I<a>*I<b>*R^-1 and places +the result in I<r>. + +BN_from_montgomery() performs the Montgomery reduction I<r> = I<a>*R^-1. + +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, 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. + +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_get_error(3)|ERR_get_error(3)>, L<BN_add(3)|BN_add(3)>, +L<BN_CTX_new(3)|BN_CTX_new(3)> + +=head1 HISTORY + +BN_MONT_CTX_new(), BN_MONT_CTX_free(), BN_MONT_CTX_set(), +BN_mod_mul_montgomery(), BN_from_montgomery() and BN_to_montgomery() +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. + +=cut |