803e4e93d4
SSL_CIPHER_description(), as there is no other API function to find out details about the cipher used besides the number of bits or protocol used.
104 lines
3.2 KiB
Plaintext
104 lines
3.2 KiB
Plaintext
=pod
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=head1 NAME
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SSL_CIPHER_get_name, SSL_CIPHER_get_bits, SSL_CIPHER_get_version, SSL_CIPHER_description - get SSL_CIPHER properties
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=head1 SYNOPSIS
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#include <openssl/ssl.h>
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const char *SSL_CIPHER_get_name(SSL_CIPHER *cipher);
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int SSL_CIPHER_get_bits(SSL_CIPHER *cipher, int *alg_bits);
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char *SSL_CIPHER_get_version(SSL_CIPHER *cipher);
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char *SSL_CIPHER_description(SSL_CIPHER *cipher, char *buf, int size);
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=head1 DESCRIPTION
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SSL_CIPHER_get_name() returns a pointer to the name of B<cipher>. If the
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argument is the NULL pointer, a pointer to the constant value "NONE" is
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returned.
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SSL_CIPHER_get_bits() returns the number of secret bits used for B<cipher>. If
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B<alg_bits> is not NULL, it contains the number of bits processed by the
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chosen algorithm. If B<cipher> is NULL, 0 is returned.
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SSL_CIPHER_get_version() returns the protocol version for B<cipher>, currently
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"SSLv2", "SSLv3", or "TLSv1". If B<cipher> is NULL, "(NONE)" is returned.
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SSL_CIPHER_description() returns a textual description of the cipher used
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into the buffer B<buf> of length B<len> provided. B<len> must be at least
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128 bytes, otherwise a pointer to the the string "Buffer too small" is
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returned. If B<buf> is NULL, a buffer of 128 bytes is allocated using
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OPENSSL_malloc(). If the allocation fails, a pointer to the string
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"OPENSSL_malloc Error" is returned.
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=head1 NOTES
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The number of bits processed can be different from the secret bits. An
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export cipher like e.g. EXP-RC4-MD5 has only 40 secret bits. The algorithm
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does use the full 128 bits (which would be returned for B<alg_bits>), of
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which however 88bits are fixed. The search space is hence only 40 bits.
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The string returned by SSL_CIPHER_description() in case of success consists
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of cleartext information seperated by one or more blanks in the following
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sequence:
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=over 4
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=item <ciphername>
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Textual representation of the cipher name.
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=item <protocol version>
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Protocol version: B<SSLv2>, B<SSLv3>. The TLSv1 ciphers are flagged with SSLv3.
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=item Kx=<key exchange>
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Key exchange method: B<RSA> (for export ciphers as B<RSA(512)> or
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B<RSA(1024)>), B<DH> (for export ciphers as B<DH(512)> or B<DH(1024)>),
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B<DH/RSA>, B<DH/DSS>, B<Fortezza>.
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=item Au=<authentication>
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Authentication method: B<RSA>, B<DSS>, B<DH>, B<None>. None is the
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representation of anonymous ciphers.
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=item Enc=<symmectric encryption method>
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Encryption method with number of secret bits: B<DES(40)>, B<DES(56)>,
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B<3DES(168)>, B<RC4(40)>, B<RC4(56)>, B<RC4(64)>, B<RC4(128)>,
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B<RC2(40)>, B<RC2(56)>, B<RC2(128)>, B<IDEA(128)>, B<Fortezza>, B<None>.
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=item Mac=<message authentication code>
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Message digest: B<MD5>, B<SHA1>.
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=item <export flag>
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If the cipher is flagged exportable with respect to old US crypto
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regulations, the word "B<export>" is printed.
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=back
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=head1 BUGS
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If SSL_CIPHER_description() is called with B<cipher> being NULL, the
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library crashes.
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If SSL_CIPHER_description() cannot handle a built-in cipher, the according
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description of the cipher property is B<unknown>. This case should not
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occur.
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=head1 RETURN VALUES
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See DESCRIPTION
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=head1 SEE ALSO
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L<ssl(3)|ssl(3)>, L<SSL_get_current_cipher(3)|SSL_get_current_cipher(3)>,
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L<SSL_get_ciphers(3)|SSL_get_ciphers(3)>, L<ciphers(1)|ciphers(1)>
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=cut
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