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ISBN : 978-2-7460-9712-4
EAN : 9782746097124
(Editions ENI)

GNU/Linux

CentOS 5.3

SSL_CIPHER_get_name(3ssl)
SSL_CIPHER_get_name

SSL_CIPHER_get_name

NAME
SYNOPSIS
DESCRIPTION
NOTES
EXAMPLES
BUGS
RETURN VALUES
SEE ALSO

NAME

SSL_CIPHER_get_name, SSL_CIPHER_get_bits, SSL_CIPHER_get_version, SSL_CIPHER_description − get SSL_CIPHER properties

SYNOPSIS 

 #include <openssl/ssl.h>

 const char *SSL_CIPHER_get_name(const SSL_CIPHER *cipher);
 int SSL_CIPHER_get_bits(const SSL_CIPHER *cipher, int *alg_bits);
 char *SSL_CIPHER_get_version(const SSL_CIPHER *cipher);
 char *SSL_CIPHER_description(SSL_CIPHER *cipher, char *buf, int size);

DESCRIPTION

SSL_CIPHER_get_name() returns a pointer to the name of cipher. If the argument is the NULL pointer, a pointer to the constant value " NONE " is returned.

SSL_CIPHER_get_bits() returns the number of secret bits used for cipher. If alg_bits is not NULL , it contains the number of bits processed by the chosen algorithm. If cipher is NULL , 0 is returned.

SSL_CIPHER_get_version() returns the protocol version for cipher, currently "SSLv2", "SSLv3", or "TLSv1". If cipher is NULL , "( NONE )" is returned.

SSL_CIPHER_description() returns a textual description of the cipher used into the buffer buf of length len provided. len must be at least 128 bytes, otherwise a pointer to the the string "Buffer too small" is returned. If buf is NULL , a buffer of 128 bytes is allocated using OPENSSL_malloc(). If the allocation fails, a pointer to the string "OPENSSL_malloc Error" is returned.

NOTES

The number of bits processed can be different from the secret bits. An export cipher like e.g. EXP−RC4−MD5 has only 40 secret bits. The algorithm does use the full 128 bits (which would be returned for alg_bits), of which however 88bits are fixed. The search space is hence only 40 bits.

The string returned by SSL_CIPHER_description() in case of success consists of cleartext information separated by one or more blanks in the following sequence:
<ciphername>

Textual representation of the cipher name.

<protocol version>

Protocol version: SSLv2, SSLv3. The TLSv1 ciphers are flagged with SSLv3.

Kx=<key exchange>

Key exchange method: RSA (for export ciphers as RSA (512) or RSA (1024)), DH (for export ciphers as DH (512) or DH (1024)), DH/RSA , DH/DSS , Fortezza.

Au=<authentication>

Authentication method: RSA , DSS , DH , None. None is the representation of anonymous ciphers.

Enc=<symmetric encryption method>

Encryption method with number of secret bits: DES (40), DES (56), 3DES(168), RC4 (40), RC4 (56), RC4 (64), RC4 (128), RC2 (40), RC2 (56), RC2 (128), IDEA (128), Fortezza, None.

Mac=<message authentication code>

Message digest: MD5 , SHA1 .

<export flag>

If the cipher is flagged exportable with respect to old US crypto regulations, the word "export" is printed.

EXAMPLES

Some examples for the output of SSL_CIPHER_description():

 EDH-RSA-DES-CBC3-SHA    SSLv3 Kx=DH       Au=RSA  Enc=3DES(168) Mac=SHA1
 EDH-DSS-DES-CBC3-SHA    SSLv3 Kx=DH       Au=DSS  Enc=3DES(168) Mac=SHA1
 RC4-MD5                 SSLv3 Kx=RSA      Au=RSA  Enc=RC4(128)  Mac=MD5
 EXP-RC4-MD5             SSLv3 Kx=RSA(512) Au=RSA  Enc=RC4(40)   Mac=MD5  export

BUGS

If SSL_CIPHER_description() is called with cipher being NULL , the library crashes.

If SSL_CIPHER_description() cannot handle a built-in cipher, the according description of the cipher property is unknown. This case should not occur.

RETURN VALUES

See DESCRIPTION

SEE ALSO

ssl(3), SSL_get_current_cipher(3), SSL_get_ciphers(3), ciphers(1)

SSL_CIPHER_get_name(3ssl)