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Title "RSA_padding_add_PKCS1_type_1 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
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 Header "SYNOPSIS" .Vb 1 #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); .Ve Header "DESCRIPTION" The RSA_padding_xxx_xxx() functions are called from the \s-1RSA\s0 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 \fIRSA_padding_check_PKCS1_OAEP() may be used in an application combined with \s-1RSA_NO_PADDING\s0 in order to implement \s-1OAEP\s0 with an encoding parameter.

\fIRSA_padding_add_xxx() encodes fl bytes from f so as to fit into \fBtlen 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:

Item "PKCS1_type_1" \s-1PKCS\s0 #1 v2.0 EMSA-PKCS1-v1_5 (\s-1PKCS\s0 #1 v1.5 block type 1); used for signatures Item "PKCS1_type_2" \s-1PKCS\s0 #1 v2.0 EME-PKCS1-v1_5 (\s-1PKCS\s0 #1 v1.5 block type 2) Item "PKCS1_OAEP" \s-1PKCS\s0 #1 v2.0 EME-OAEP Item "SSLv23" \s-1PKCS\s0 #1 EME-PKCS1-v1_5 with SSL-specific modification Item "none" simply copy the data

The random number generator must be seeded prior to calling \fIRSA_padding_add_xxx().

\fIRSA_padding_check_xxx() verifies that the fl bytes at f contain a valid encoding for a rsa_len byte \s-1RSA\s0 key in the respective encoding method and stores the recovered data of at most tlen bytes (for \s-1RSA_NO_PADDING\s0: of size tlen) at to.

For RSA_padding_xxx_OAEP(), p points to the encoding parameter of length pl. p may be \s-1NULL\s0 if pl is 0.

Header "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 \fIERR_get_error\|(3). Header "SEE ALSO" \fIRSA_public_encrypt\|(3), \fIRSA_private_decrypt\|(3), \fIRSA_sign\|(3), RSA_verify\|(3) Header "HISTORY" \fIRSA_padding_add_PKCS1_type_1(), RSA_padding_check_PKCS1_type_1(), \fIRSA_padding_add_PKCS1_type_2(), RSA_padding_check_PKCS1_type_2(), \fIRSA_padding_add_SSLv23(), RSA_padding_check_SSLv23(), \fIRSA_padding_add_none() and RSA_padding_check_none() appeared in SSLeay 0.9.0.

\fIRSA_padding_add_PKCS1_OAEP() and RSA_padding_check_PKCS1_OAEP() were added in OpenSSL 0.9.2b.