RSA_sign 3 2005-11-24 0.9.9-dev OpenSSL
NAME
RSA_sign, RSA_verify - RSA signatures
LIBRARY
libcrypto, -lcrypto
SYNOPSIS
#include
int RSA_sign(int type, const unsigned char *m, unsigned int m_len,
unsigned char *sigret, unsigned int *siglen, RSA *rsa);
int RSA_verify(int type, const unsigned char *m, unsigned int m_len,
unsigned char *sigbuf, unsigned int siglen, RSA *rsa);
DESCRIPTION
_R_S_A___s_i_g_n_(_) signs the message digest mm of size mm__lleenn using the
private key rrssaa as specified in PKCS #1 v2.0. It stores the
signature in ssiiggrreett and the signature size in ssiigglleenn. ssiiggrreett
must point to RSA_size(rrssaa) bytes of memory.
ttyyppee denotes the message digest algorithm that was used to generate
mm. It usually is one of NNIIDD__sshhaa11, NNIIDD__rriippeemmdd116600 and NNIIDD__mmdd55;
see _o_b_j_e_c_t_s(3) for details. If ttyyppee is NNIIDD__mmdd55__sshhaa11,
an SSL signature (MD5 and SHA1 message digests with PKCS #1 padding
and no algorithm identifier) is created.
_R_S_A___v_e_r_i_f_y_(_) verifies that the signature ssiiggbbuuff of size ssiigglleenn
matches a given message digest mm of size mm__lleenn. ttyyppee denotes
the message digest algorithm that was used to generate the signature.
rrssaa is the signer's public key.
RETURN VALUES
_R_S_A___s_i_g_n_(_) returns 1 on success, 0 otherwise. _R_S_A___v_e_r_i_f_y_(_) returns 1
on successful verification, 0 otherwise.
The error codes can be obtained by _E_R_R___g_e_t___e_r_r_o_r(3).
BUGS
Certain signatures with an improper algorithm identifier are accepted
for compatibility with SSLeay 0.4.5 :-)
SSL, PKCS #1 v2.0
SEE ALSO
_E_R_R___g_e_t___e_r_r_o_r(3), _o_b_j_e_c_t_s(3),
_o_p_e_n_s_s_l___r_s_a(3), _R_S_A___p_r_i_v_a_t_e___e_n_c_r_y_p_t(3),
_R_S_A___p_u_b_l_i_c___d_e_c_r_y_p_t(3)
HISTORY
_R_S_A___s_i_g_n_(_) and _R_S_A___v_e_r_i_f_y_(_) are available in all versions of SSLeay
and OpenSSL.