249 lines
8.0 KiB
Groff
249 lines
8.0 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "rsa 3"
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.TH rsa 3 "2014-08-06" "1.0.1i" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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rsa \- RSA public key cryptosystem
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 2
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\& #include <openssl/rsa.h>
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\& #include <openssl/engine.h>
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\&
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\& RSA * RSA_new(void);
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\& void RSA_free(RSA *rsa);
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\&
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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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\&
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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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\&
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\& int RSA_size(const RSA *rsa);
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\&
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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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\&
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\& int RSA_check_key(RSA *rsa);
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\&
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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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\&
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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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\&
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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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\&
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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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\&
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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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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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These functions implement \s-1RSA\s0 public key encryption and signatures
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as defined in \s-1PKCS\s0 #1 v2.0 [\s-1RFC\s0 2437].
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.PP
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The \fB\s-1RSA\s0\fR structure consists of several \s-1BIGNUM\s0 components. It can
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contain public as well as private \s-1RSA\s0 keys:
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.PP
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.Vb 10
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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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.Ve
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.PP
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In public keys, the private exponent and the related secret values are
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\&\fB\s-1NULL\s0\fR.
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.PP
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\&\fBp\fR, \fBq\fR, \fBdmp1\fR, \fBdmq1\fR and \fBiqmp\fR may be \fB\s-1NULL\s0\fR in private
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keys, but the \s-1RSA\s0 operations are much faster when these values are
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available.
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.PP
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Note that \s-1RSA\s0 keys may use non-standard \fB\s-1RSA_METHOD\s0\fR implementations,
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either directly or by the use of \fB\s-1ENGINE\s0\fR modules. In some cases (eg. an
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\&\s-1ENGINE\s0 providing support for hardware-embedded keys), these \s-1BIGNUM\s0 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 \s-1RSA\s0
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structure elements directly and instead use \s-1API\s0 functions to query or
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modify keys.
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.SH "CONFORMING TO"
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.IX Header "CONFORMING TO"
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\&\s-1SSL\s0, \s-1PKCS\s0 #1 v2.0
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.SH "PATENTS"
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.IX Header "PATENTS"
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\&\s-1RSA\s0 was covered by a \s-1US\s0 patent which expired in September 2000.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIrsa\fR\|(1), \fIbn\fR\|(3), \fIdsa\fR\|(3), \fIdh\fR\|(3),
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\&\fIrand\fR\|(3), \fIengine\fR\|(3), \fIRSA_new\fR\|(3),
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\&\fIRSA_public_encrypt\fR\|(3),
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\&\fIRSA_sign\fR\|(3), \fIRSA_size\fR\|(3),
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\&\fIRSA_generate_key\fR\|(3),
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\&\fIRSA_check_key\fR\|(3),
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\&\fIRSA_blinding_on\fR\|(3),
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\&\fIRSA_set_method\fR\|(3), \fIRSA_print\fR\|(3),
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\&\fIRSA_get_ex_new_index\fR\|(3),
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\&\fIRSA_private_encrypt\fR\|(3),
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\&\fIRSA_sign_ASN1_OCTET_STRING\fR\|(3),
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\&\fIRSA_padding_add_PKCS1_type_1\fR\|(3)
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