From b879882a4b260067bc963807cb6b15b3c75902e8 Mon Sep 17 00:00:00 2001 From: Richard Levitte Date: Sat, 2 Apr 2016 16:43:21 +0200 Subject: [PATCH] Document RSA accessors/writers Reviewed-by: Matt Caswell --- doc/crypto/RSA_get0_key.pod | 86 +++++++++++++++++++++++++++++++++++++ doc/crypto/rsa.pod | 27 +++--------- 2 files changed, 93 insertions(+), 20 deletions(-) create mode 100644 doc/crypto/RSA_get0_key.pod diff --git a/doc/crypto/RSA_get0_key.pod b/doc/crypto/RSA_get0_key.pod new file mode 100644 index 0000000000..5caf9dd72e --- /dev/null +++ b/doc/crypto/RSA_get0_key.pod @@ -0,0 +1,86 @@ +=pod + +=head1 NAME + +RSA_set0_key, RSA_set0_factors, RSA_set0_crt_params, RSA_get0_key, +RSA_get0_factors, RSA_get0_crt_params, RSA_clear_flags, +RSA_test_flags, RSA_set_flags, RSA_get0_engine - Routines for getting +and setting data in an RSA object + +=head1 SYNOPSIS + + #include + + int RSA_set0_key(RSA *r, BIGNUM *n, BIGNUM *e, BIGNUM *d); + int RSA_set0_factors(RSA *r, BIGNUM *p, BIGNUM *q); + int RSA_set0_crt_params(RSA *r,BIGNUM *dmp1, BIGNUM *dmq1, BIGNUM *iqmp); + void RSA_get0_key(const RSA *r, BIGNUM **n, BIGNUM **e, BIGNUM **d); + void RSA_get0_factors(const RSA *r, BIGNUM **p, BIGNUM **q); + void RSA_get0_crt_params(const RSA *r, + BIGNUM **dmp1, BIGNUM **dmq1, BIGNUM **iqmp); + void RSA_clear_flags(RSA *r, int flags); + int RSA_test_flags(const RSA *r, int flags); + void RSA_set_flags(RSA *r, int flags); + ENGINE *RSA_get0_engine(RSA *r); + +=head1 DESCRIPTION + +An RSA object contains the components for the public and private key, +B, B, B, B

, B, B, B and B. B is +the modulus common to both public and private key, B is the public +exponent and B is the private exponent. B

, B, B, +B and B are the factors for the second representation of a +private key (see PKCS#1 section 3 Key Types), where B

and B are +the first and second factor of B and B, B and B +are the exponents and coefficient for CRT calculations. + +The B, B and B parameters can be obtained by calling +RSA_get0_key(). If they have not been set yet, then B<*n>, B<*e> and +B<*d> will be set to NULL. Otherwise, they are set to pointers to +their respective values. These point directly to the internal +representations of the values and therefore should not be freed +by the caller. + +The B, B and B parameter values can be set by calling +RSA_set0_key() and passing the new values for B, B and B as +parameters to the function. Calling this function transfers the memory +management of the values to the RSA object, and therefore the values +that have been passed in should not be freed by the caller after this +function has been called. + +In a similar fashion, the B

and B parameters can be obtained and +set with RSA_get0_factors() and RSA_set0_factors(), and the B, +B and B parameters can be obtained and set with +RSA_get0_crt_params() and RSA_set0_crt_params(). + +RSA_set_flags() sets the flags in the B parameter on the RSA +object. Multiple flags can be passed in one go (bitwise ORed together). +Any flags that are already set are left set. RSA_test_flags() tests to +see whether the flags passed in the B parameter are currently +set in the RSA object. Multiple flags can be tested in one go. All +flags that are currently set are returned, or zero if none of the +flags are set. RSA_clear_flags() clears the specified flags within the +RSA object. + +RSA_get0_engine() returns a handle to the ENGINE that has been set for +this RSA object, or NULL if no such ENGINE has been set. + +=head1 RETURN VALUES + +RSA_set0_key(), RSA_set0_factors and RSA_set0_crt_params() return 1 on +success or 0 on failure. + +RSA_test_flags() returns the current state of the flags in the RSA object. + +RSA_get0_engine() returns the ENGINE set for the RSA object or NULL if no +ENGINE has been set. + +=head1 SEE ALSO + +L, L, L + +=head1 HISTORY + +The functions described here were added in OpenSSL version 1.1.0. + +=cut diff --git a/doc/crypto/rsa.pod b/doc/crypto/rsa.pod index 9c42923abd..a1341b8d7c 100644 --- a/doc/crypto/rsa.pod +++ b/doc/crypto/rsa.pod @@ -58,25 +58,12 @@ rsa - RSA public key cryptosystem These functions implement RSA public key encryption and signatures as defined in PKCS #1 v2.0 [RFC 2437]. -The B structure consists of several BIGNUM components. It can -contain public as well as private RSA keys: - - struct - { - BIGNUM *n; // public modulus - BIGNUM *e; // public exponent - BIGNUM *d; // private exponent - BIGNUM *p; // secret prime factor - BIGNUM *q; // secret prime factor - BIGNUM *dmp1; // d mod (p-1) - BIGNUM *dmq1; // d mod (q-1) - BIGNUM *iqmp; // q^-1 mod p - // ... - }; - RSA - -In public keys, the private exponent and the related secret values are -B. +The B structure consists of the BIGNUM components B, B, +B, B

, B, B, B and B, which represent public +as well as private RSA keys. + +In public keys, the private exponent B and the related secret +values B

, B, B, B and B are B. B

, B, B, B and B may be B in private keys, but the RSA operations are much faster when these values are @@ -101,7 +88,7 @@ RSA was covered by a US patent which expired in September 2000. =head1 SEE ALSO L, L, L, L, -L, L, L, +L, L, L, L L, L, L, L, -- 2.34.1