121 lines
4 KiB
Text
121 lines
4 KiB
Text
=pod
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=head1 NAME
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rsa - RSA public key cryptosystem
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=head1 SYNOPSIS
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#include <openssl/rsa.h>
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#include <openssl/engine.h>
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RSA * RSA_new(void);
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void RSA_free(RSA *rsa);
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int RSA_public_encrypt(int flen, unsigned char *from,
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unsigned char *to, RSA *rsa, int padding);
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int RSA_private_decrypt(int flen, unsigned char *from,
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unsigned char *to, RSA *rsa, int padding);
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int RSA_private_encrypt(int flen, unsigned char *from,
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unsigned char *to, RSA *rsa,int padding);
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int RSA_public_decrypt(int flen, unsigned char *from,
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unsigned char *to, RSA *rsa,int padding);
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int RSA_sign(int type, unsigned char *m, unsigned int m_len,
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unsigned char *sigret, unsigned int *siglen, RSA *rsa);
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int RSA_verify(int type, unsigned char *m, unsigned int m_len,
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unsigned char *sigbuf, unsigned int siglen, RSA *rsa);
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RSA *RSA_generate_key(int num, unsigned long e,
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void (*callback)(int,int,void *), void *cb_arg);
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int RSA_check_key(RSA *rsa);
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int RSA_blinding_on(RSA *rsa, BN_CTX *ctx);
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void RSA_blinding_off(RSA *rsa);
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void RSA_set_default_method(const RSA_METHOD *meth);
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const RSA_METHOD *RSA_get_default_method(void);
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int RSA_set_method(RSA *rsa, const RSA_METHOD *meth);
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const RSA_METHOD *RSA_get_method(const RSA *rsa);
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RSA_METHOD *RSA_PKCS1_SSLeay(void);
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RSA_METHOD *RSA_null_method(void);
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int RSA_flags(const RSA *rsa);
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RSA *RSA_new_method(ENGINE *engine);
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int RSA_print(BIO *bp, RSA *x, int offset);
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int RSA_print_fp(FILE *fp, RSA *x, int offset);
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int RSA_get_ex_new_index(long argl, char *argp, int (*new_func)(),
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int (*dup_func)(), void (*free_func)());
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int RSA_set_ex_data(RSA *r,int idx,char *arg);
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char *RSA_get_ex_data(RSA *r, int idx);
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int RSA_sign_ASN1_OCTET_STRING(int dummy, unsigned char *m,
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unsigned int m_len, unsigned char *sigret, unsigned int *siglen,
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RSA *rsa);
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int RSA_verify_ASN1_OCTET_STRING(int dummy, unsigned char *m,
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unsigned int m_len, unsigned char *sigbuf, unsigned int siglen,
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RSA *rsa);
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=head1 DESCRIPTION
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These functions implement RSA public key encryption and signatures
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as defined in PKCS #1 v2.0 [RFC 2437].
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The B<RSA> structure consists of several BIGNUM components. It can
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contain public as well as private RSA keys:
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struct
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{
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BIGNUM *n; // public modulus
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BIGNUM *e; // public exponent
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BIGNUM *d; // private exponent
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BIGNUM *p; // secret prime factor
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BIGNUM *q; // secret prime factor
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BIGNUM *dmp1; // d mod (p-1)
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BIGNUM *dmq1; // d mod (q-1)
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BIGNUM *iqmp; // q^-1 mod p
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// ...
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};
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RSA
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In public keys, the private exponent and the related secret values are
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B<NULL>.
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B<p>, B<q>, B<dmp1>, B<dmq1> and B<iqmp> may be B<NULL> in private
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keys, but the RSA operations are much faster when these values are
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available.
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Note that RSA keys may use non-standard B<RSA_METHOD> implementations,
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either directly or by the use of B<ENGINE> modules. In some cases (eg. an
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ENGINE providing support for hardware-embedded keys), these BIGNUM values
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will not be used by the implementation or may be used for alternative data
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storage. For this reason, applications should generally avoid using RSA
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structure elements directly and instead use API functions to query or
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modify keys.
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=head1 CONFORMING TO
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SSL, PKCS #1 v2.0
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=head1 PATENTS
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RSA was covered by a US patent which expired in September 2000.
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=head1 SEE ALSO
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L<rsa(1)|rsa(1)>, L<bn(3)|bn(3)>, L<dsa(3)|dsa(3)>, L<dh(3)|dh(3)>,
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L<rand(3)|rand(3)>, L<engine(3)|engine(3)>, L<RSA_new(3)|RSA_new(3)>,
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L<RSA_public_encrypt(3)|RSA_public_encrypt(3)>,
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L<RSA_sign(3)|RSA_sign(3)>, L<RSA_size(3)|RSA_size(3)>,
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L<RSA_generate_key(3)|RSA_generate_key(3)>,
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L<RSA_check_key(3)|RSA_check_key(3)>,
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L<RSA_blinding_on(3)|RSA_blinding_on(3)>,
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L<RSA_set_method(3)|RSA_set_method(3)>, L<RSA_print(3)|RSA_print(3)>,
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L<RSA_get_ex_new_index(3)|RSA_get_ex_new_index(3)>,
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L<RSA_private_encrypt(3)|RSA_private_encrypt(3)>,
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L<RSA_sign_ASN1_OCTET_STRING(3)|RSA_sign_ASN1_OCTET_STRING(3)>,
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L<RSA_padding_add_PKCS1_type_1(3)|RSA_padding_add_PKCS1_type_1(3)>
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=cut
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