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Title "rsa 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
rsa - RSA public key cryptosystem 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 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].

The \s-1RSA\s0 structure consists of several \s-1BIGNUM\s0 components. It can contain public as well as private \s-1RSA\s0 keys:

.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

In public keys, the private exponent and the related secret values are \fB\s-1NULL\s0.

\fBp, q, dmp1, dmq1 and iqmp may be \s-1NULL\s0 in private keys, but the \s-1RSA\s0 operations are much faster when these values are available.

Note that \s-1RSA\s0 keys may use non-standard \s-1RSA_METHOD\s0 implementations, either directly or by the use of \s-1ENGINE\s0 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.

Header "CONFORMING TO" \s-1SSL, PKCS\s0 #1 v2.0 Header "PATENTS" \s-1RSA\s0 was covered by a \s-1US\s0 patent which expired in September 2000. Header "SEE ALSO" \fIrsa\|(1), bn\|(3), dsa\|(3), dh\|(3), \fIrand\|(3), engine\|(3), RSA_new\|(3), \fIRSA_public_encrypt\|(3), \fIRSA_sign\|(3), RSA_size\|(3), \fIRSA_generate_key\|(3), \fIRSA_check_key\|(3), \fIRSA_blinding_on\|(3), \fIRSA_set_method\|(3), RSA_print\|(3), \fIRSA_get_ex_new_index\|(3), \fIRSA_private_encrypt\|(3), \fIRSA_sign_ASN1_OCTET_STRING\|(3), \fIRSA_padding_add_PKCS1_type_1\|(3)