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=pod =head1 NAME 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_PKCS1_OAEP, RSA_padding_check_PKCS1_OAEP, RSA_padding_add_SSLv23, RSA_padding_check_SSLv23, RSA_padding_add_none, RSA_padding_check_none - asymmetric encryption padding =head1 SYNOPSIS #include 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); =head1 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 B in order to implement OAEP with an encoding parameter. RSA_padding_add_xxx() encodes B bytes from B so as to fit into B bytes and stores the result at B. An error occurs if B does not meet the size requirements of the encoding method. The following encoding methods are implemented: =over 4 =item PKCS1_type_1 PKCS #1 v2.0 EMSA-PKCS1-v1_5 (PKCS #1 v1.5 block type 1); used for signatures =item PKCS1_type_2 PKCS #1 v2.0 EME-PKCS1-v1_5 (PKCS #1 v1.5 block type 2) =item PKCS1_OAEP PKCS #1 v2.0 EME-OAEP =item SSLv23 PKCS #1 EME-PKCS1-v1_5 with SSL-specific modification =item none simply copy the data =back The random number generator must be seeded prior to calling RSA_padding_add_xxx(). RSA_padding_check_xxx() verifies that the B bytes at B contain a valid encoding for a B byte RSA key in the respective encoding method and stores the recovered data of at most B bytes (for B: of size B) at B. For RSA_padding_xxx_OAEP(), B

points to the encoding parameter of length B. B

may be B if B is 0. =head1 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 L. =head1 SEE ALSO L, L, L, L =head1 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. =cut