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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" rsa \- RSA public key cryptosystem .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 2 \& #include <openssl/rsa.h> \& #include <openssl/engine.h> \& \& RSA * RSA_new(void); \& void RSA_free(RSA *rsa); \& \& int RSA_public_encrypt(int flen, unsigned char *from, \& unsigned char *to, RSA *rsa, int padding); \& int RSA_private_decrypt(int flen, unsigned char *from, \& unsigned char *to, RSA *rsa, int padding); \& int RSA_private_encrypt(int flen, unsigned char *from, \& unsigned char *to, RSA *rsa,int padding); \& int RSA_public_decrypt(int flen, unsigned char *from, \& unsigned char *to, RSA *rsa,int padding); \& \& int RSA_sign(int type, unsigned char *m, unsigned int m_len, \& unsigned char *sigret, unsigned int *siglen, RSA *rsa); \& int RSA_verify(int type, unsigned char *m, unsigned int m_len, \& unsigned char *sigbuf, unsigned int siglen, RSA *rsa); \& \& int RSA_size(const RSA *rsa); \& \& RSA *RSA_generate_key(int num, unsigned long e, \& void (*callback)(int,int,void *), void *cb_arg); \& \& int RSA_check_key(RSA *rsa); \& \& int RSA_blinding_on(RSA *rsa, BN_CTX *ctx); \& void RSA_blinding_off(RSA *rsa); \& \& void RSA_set_default_method(const RSA_METHOD *meth); \& const RSA_METHOD *RSA_get_default_method(void); \& int RSA_set_method(RSA *rsa, const RSA_METHOD *meth); \& const RSA_METHOD *RSA_get_method(const RSA *rsa); \& RSA_METHOD *RSA_PKCS1_SSLeay(void); \& RSA_METHOD *RSA_null_method(void); \& int RSA_flags(const RSA *rsa); \& RSA *RSA_new_method(ENGINE *engine); \& \& int RSA_print(BIO *bp, RSA *x, int offset); \& int RSA_print_fp(FILE *fp, RSA *x, int offset); \& \& int RSA_get_ex_new_index(long argl, char *argp, int (*new_func)(), \& int (*dup_func)(), void (*free_func)()); \& int RSA_set_ex_data(RSA *r,int idx,char *arg); \& char *RSA_get_ex_data(RSA *r, int idx); \& \& int RSA_sign_ASN1_OCTET_STRING(int dummy, unsigned char *m, \& unsigned int m_len, unsigned char *sigret, unsigned int *siglen, \& RSA *rsa); \& int RSA_verify_ASN1_OCTET_STRING(int dummy, unsigned char *m, \& unsigned int m_len, unsigned char *sigbuf, unsigned int siglen, \& RSA *rsa); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" These functions implement \s-1RSA\s0 public key encryption and signatures as defined in \s-1PKCS\s0 #1 v2.0 [\s-1RFC 2437\s0]. .PP The \fB\s-1RSA\s0\fR structure consists of several \s-1BIGNUM\s0 components. It can contain public as well as private \s-1RSA\s0 keys: .PP .Vb 10 \& 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 .Ve .PP In public keys, the private exponent and the related secret values are \&\fB\s-1NULL\s0\fR. .PP \&\fBp\fR, \fBq\fR, \fBdmp1\fR, \fBdmq1\fR and \fBiqmp\fR may be \fB\s-1NULL\s0\fR in private keys, but the \s-1RSA\s0 operations are much faster when these values are available. .PP Note that \s-1RSA\s0 keys may use non-standard \fB\s-1RSA_METHOD\s0\fR implementations, either directly or by the use of \fB\s-1ENGINE\s0\fR modules. In some cases (eg. an \&\s-1ENGINE\s0 providing support for hardware-embedded keys), these \s-1BIGNUM\s0 values will not be used by the implementation or may be used for alternative data storage. For this reason, applications should generally avoid using \s-1RSA\s0 structure elements directly and instead use \s-1API\s0 functions to query or modify keys. .SH "CONFORMING TO" .IX Header "CONFORMING TO" \&\s-1SSL, PKCS\s0 #1 v2.0 .SH "PATENTS" .IX Header "PATENTS" \&\s-1RSA\s0 was covered by a \s-1US\s0 patent which expired in September 2000. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBrsa\fR\|(1), \fBbn\fR\|(3), \fBdsa\fR\|(3), \fBdh\fR\|(3), \&\fBrand\fR\|(3), \fBengine\fR\|(3), \fBRSA_new\fR\|(3), \&\fBRSA_public_encrypt\fR\|(3), \&\fBRSA_sign\fR\|(3), \fBRSA_size\fR\|(3), \&\fBRSA_generate_key\fR\|(3), \&\fBRSA_check_key\fR\|(3), \&\fBRSA_blinding_on\fR\|(3), \&\fBRSA_set_method\fR\|(3), \fBRSA_print\fR\|(3), \&\fBRSA_get_ex_new_index\fR\|(3), \&\fBRSA_private_encrypt\fR\|(3), \&\fBRSA_sign_ASN1_OCTET_STRING\fR\|(3), \&\fBRSA_padding_add_PKCS1_type_1\fR\|(3)
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