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HP Open Source Security for OpenVMS Volume 2:... |
CRYPTO Application Programming Interface (API)... |
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| Description Return Values See Also History |
Synopsis #include <openssl/rsa.h>
int
RSA_padding_add_PKCS1_type_1(unsigned char *to, int tlen, unsigned
char *f, int fl); int RSA_padding_check_PKCS1_type_1(unsigned char
*to, int tlen, unsigned char *f, int fl, int rsa_len);
int
RSA_padding_add_PKCS1_type_2(unsigned char *to, int tlen, unsigned
char *f, int fl); int RSA_padding_check_PKCS1_type_2(unsigned char
*to, int tlen, unsigned char *f, int fl, int rsa_len);
int
RSA_padding_add_PKCS1_OAEP(unsigned char *to, int tlen, unsigned
char *f, int fl, unsigned char *p, int pl);
int RSA_padding_check_PKCS1_OAEP(unsigned
char *to, int tlen, unsigned char *f, int fl, int rsa_len, unsigned
char *p, int pl);
int RSA_padding_add_SSLv23(unsigned char
*to, int tlen, unsigned char *f, int fl);
int RSA_padding_check_SSLv23(unsigned
char *to, int tlen, unsigned char *f, int fl, int rsa_len);
int
RSA_padding_add_none(unsigned char *to, int tlen, unsigned char
*f, int fl);
int RSA_padding_check_none(unsigned char
*to, int tlen, unsigned char *f, int fl, int rsa_len);
DESCRIPTION The RSA_padding_xxx_xxx() functions are called from the RSA
encrypt, decrypt, sign and verify functions. Normally they should
not be called from application programs. However, they can also be called directly to implement padding for other asymmetric ciphers. RSA_padding_add_PKCS1_OAEP() and RSA_padding_check_PKCS1_OAEP() may be used in an application combined with RSA_NO_PADDING in order to implement OAEP with an encoding parameter.
RSA_padding_add_xxx() encodes fl bytes from f so as to fit into tlen bytes and stores the result at to. An error occurs if fl does not meet the size requirements of the encoding method.
The following encoding methods are implemented:
The random number generator must be seeded prior to calling RSA_padding_add_xxx().
RSA_padding_check_xxx() verifies that the fl bytes at f contain a valid encoding for a rsa_len byte RSA key in the respective encoding method and stores the recovered data of at most tlen bytes (for RSA_NO_PADDING: of size tlen) at to.
For RSA_padding_xxx_OAEP(), p points to the encoding parameter of length pl. p may be NULL if pl is 0.
RETURN VALUES The RSA_padding_add_xxx() functions return 1 on success, 0
on error. The RSA_padding_check_xxx() functions return the length
of the recovered data, -1 on error. Error codes can be obtained
by calling ERR_get_error(3) . SEE ALSO RSA_public_encrypt(3) , RSA_private_decrypt(3) , RSA_sign(3) , RSA_verify(3) HISTORY RSA_padding_add_PKCS1_type_1(), RSA_padding_check_PKCS1_type_1(), RSA_padding_add_PKCS1_type_2(),
RSA_padding_check_PKCS1_type_2(), RSA_padding_add_SSLv23(), RSA_padding_check_SSLv23(),
RSA_padding_add_none() and RSA_padding_check_none() appeared in SSLeay
0.9.0. RSA_padding_add_PKCS1_OAEP() and RSA_padding_check_PKCS1_OAEP() were added in OpenSSL 0.9.2b.
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