1 .\" $OpenBSD: RSA_new.3,v 1.10 2018/04/18 01:11:45 schwarze Exp $
2 .\" OpenSSL doc/man3/RSA_new.pod 99d63d46 Oct 26 13:56:48 2016 -0400
3 .\" OpenSSL doc/crypto/rsa.pod 35d2e327 Jun 3 16:19:49 2016 -0400
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52 .Dd $Mdocdate: April 18 2018 $
59 .Nd allocate and free RSA objects
73 The RSA functions implement RSA public key encryption and signatures
74 as defined in PKCS #1 v2.0 (RFC 2437).
77 allocates and initializes an
79 structure, setting the reference count to 1.
80 It is equivalent to calling
87 increments the reference count by 1.
90 decrements the reference count by 1.
91 If it reaches 0, it frees the
93 structure and its components.
94 The key is erased before the memory is returned to the system.
99 pointer, no action occurs.
103 structure consists of several
106 It can contain public as well as private RSA keys:
109 BIGNUM *n; // public modulus
110 BIGNUM *e; // public exponent
111 BIGNUM *d; // private exponent
112 BIGNUM *p; // secret prime factor
113 BIGNUM *q; // secret prime factor
114 BIGNUM *dmp1; // d mod (p-1)
115 BIGNUM *dmq1; // d mod (q-1)
116 BIGNUM *iqmp; // q^-1 mod p
121 In public keys, the private exponent
123 and the related secret values
124 .Fa p , q , dmp1 , dmp2 ,
138 in private keys, but the RSA operations are much faster when these
139 values are available.
141 Note that RSA keys may use non-standard
143 implementations, either directly or by the use of
146 In some cases (e.g. an
148 providing support for hardware-embedded keys), these
150 values will not be used by the implementation or may be used for
151 alternative data storage.
152 For this reason, applications should generally avoid using
154 structure elements directly and instead use API functions to query
157 If the allocation fails,
161 and sets an error code that can be obtained by
162 .Xr ERR_get_error 3 .
163 Otherwise it returns a pointer to the newly allocated structure.
166 returns 1 for success or 0 for failure.
169 .Xr d2i_RSAPublicKey 3 ,
172 .Xr ERR_get_error 3 ,
173 .Xr EVP_PKEY_set1_RSA 3 ,
174 .Xr RSA_blinding_on 3 ,
175 .Xr RSA_check_key 3 ,
176 .Xr RSA_generate_key 3 ,
178 .Xr RSA_get_ex_new_index 3 ,
180 .Xr RSA_padding_add_PKCS1_type_1 3 ,
182 .Xr RSA_private_encrypt 3 ,
183 .Xr RSA_public_encrypt 3 ,
184 .Xr RSA_set_method 3 ,
186 .Xr RSA_sign_ASN1_OCTET_STRING 3 ,
191 RSA was covered by a US patent which expired in September 2000.
196 appeared in SSLeay 0.4 or earlier and have been available since
200 first appeared in OpenSSL 0.9.7 and has been available since