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-.\"	$OpenBSD: rsa.3,v 1.6 2016/12/11 09:57:57 jmc Exp $
-.\"
-.Dd $Mdocdate: December 11 2016 $
-.Dt RSA 3
-.Os
-.Sh NAME
-.Nm rsa
-.Nd RSA public key cryptosystem
-.Sh SYNOPSIS
-.In openssl/rsa.h
-.Sh DESCRIPTION
-These functions implement RSA public key encryption and signatures as
-defined in PKCS #1 v2.0 [RFC 2437].
-.Pp
-The
-.Vt RSA
-structure consists of several BIGNUM components.
-It can contain public as well as private RSA keys:
-.Bd -literal
-typdef 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;
-.Ed
-.Pp
-In public keys, the private exponent and the related secret values are
-.Dv NULL .
-.Pp
-.Fa p ,
-.Fa q ,
-.Fa dmp1 ,
-.Fa dmq1 ,
-and
-.Fa iqmp
-may be
-.Dv NULL
-in private keys, but the RSA operations are much faster when these
-values are available.
-.Pp
-Note that RSA keys may use non-standard
-.Vt RSA_METHOD
-implementations, either directly or by the use of
-.Vt ENGINE
-modules.
-In some cases (e.g. an
-.Vt ENGINE
-providing support for hardware-embedded keys), these
-.Vt BIGNUM
-values will not be used by the implementation or may be used for
-alternative data storage.
-For this reason, applications should generally avoid using
-.Vt RSA
-structure elements directly and instead use API functions to query
-or modify keys.
-.Sh SEE ALSO
-.Xr BN_new 3 ,
-.Xr d2i_RSAPublicKey 3 ,
-.Xr DH_new 3 ,
-.Xr DSA_new 3 ,
-.Xr engine 3 ,
-.Xr EVP_PKEY_set1_RSA 3 ,
-.Xr RSA_blinding_on 3 ,
-.Xr RSA_check_key 3 ,
-.Xr RSA_generate_key 3 ,
-.Xr RSA_get_ex_new_index 3 ,
-.Xr RSA_new 3 ,
-.Xr RSA_padding_add_PKCS1_type_1 3 ,
-.Xr RSA_print 3 ,
-.Xr RSA_private_encrypt 3 ,
-.Xr RSA_public_encrypt 3 ,
-.Xr RSA_set_method 3 ,
-.Xr RSA_sign 3 ,
-.Xr RSA_sign_ASN1_OCTET_STRING 3 ,
-.Xr RSA_size 3
-.Sh STANDARDS
-SSL, PKCS #1 v2.0
-.Pp
-RSA was covered by a US patent which expired in September 2000.