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Edit File : SSL_CIPHER_get_version.3 \| Size : 9.21 KB
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" SSL_CIPHER_get_name, SSL_CIPHER_get_bits, SSL_CIPHER_get_version, SSL_CIPHER_description \- get SSL_CIPHER properties .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #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(const SSL_CIPHER cipher, char buf, int size); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBSSL_CIPHER_get_name()\fR returns a pointer to the name of \fBcipher\fR. If the argument is the \s-1NULL\s0 pointer, a pointer to the constant value \(L"\s-1NONE\(R"\s0 is returned. .PP \&\fBSSL_CIPHER_get_bits()\fR returns the number of secret bits used for \fBcipher\fR. If \&\fBalg_bits\fR is not \s-1NULL,\s0 it contains the number of bits processed by the chosen algorithm. If \fBcipher\fR is \s-1NULL, 0\s0 is returned. .PP \&\fBSSL_CIPHER_get_version()\fR returns string which indicates the \s-1SSL/TLS\s0 protocol version that first defined the cipher. This is currently \fBSSLv2\fR or \fBTLSv1/SSLv3\fR. In some cases it should possibly return \(L"TLSv1.2\(R" but does not; use \fBSSL_CIPHER_description()\fR instead. If \fBcipher\fR is \s-1NULL, \(L"\s0(\s-1NONE\s0)\(R" is returned. .PP \&\fBSSL_CIPHER_description()\fR returns a textual description of the cipher used into the buffer \fBbuf\fR of length \fBlen\fR provided. \fBlen\fR must be at least 128 bytes, otherwise a pointer to the string \(L"Buffer too small\(R" is returned. If \fBbuf\fR is \s-1NULL,\s0 a buffer of 128 bytes is allocated using \&\fBOPENSSL_malloc()\fR. If the allocation fails, a pointer to the string \&\(L"OPENSSL_malloc Error\(R" is returned. .SH "NOTES" .IX Header "NOTES" The number of bits processed can be different from the secret bits. An export cipher like e.g. \s-1EXP\-RC4\-MD5\s0 has only 40 secret bits. The algorithm does use the full 128 bits (which would be returned for \fBalg_bits\fR), of which however 88bits are fixed. The search space is hence only 40 bits. .PP The string returned by \fBSSL_CIPHER_description()\fR in case of success consists of cleartext information separated by one or more blanks in the following sequence: .IP "<ciphername>" 4 .IX Item "<ciphername>" Textual representation of the cipher name. .IP "<protocol version>" 4 .IX Item "<protocol version>" Protocol version: \fBSSLv2\fR, \fBSSLv3\fR, \fBTLSv1.2\fR. The TLSv1.0 ciphers are flagged with SSLv3. No new ciphers were added by TLSv1.1. .IP "Kx=<key exchange>" 4 .IX Item "Kx=<key exchange>" Key exchange method: \fB\s-1RSA\s0\fR (for export ciphers as \fB\s-1RSA\s0(512)\fR or \&\fB\s-1RSA\s0(1024)\fR), \fB\s-1DH\s0\fR (for export ciphers as \fB\s-1DH\s0(512)\fR or \fB\s-1DH\s0(1024)\fR), \&\fB\s-1DH/RSA\s0\fR, \fB\s-1DH/DSS\s0\fR, \fBFortezza\fR. .IP "Au=<authentication>" 4 .IX Item "Au=<authentication>" Authentication method: \fB\s-1RSA\s0\fR, \fB\s-1DSS\s0\fR, \fB\s-1DH\s0\fR, \fBNone\fR. None is the representation of anonymous ciphers. .IP "Enc=<symmetric encryption method>" 4 .IX Item "Enc=<symmetric encryption method>" Encryption method with number of secret bits: \fB\s-1DES\s0(40)\fR, \fB\s-1DES\s0(56)\fR, \&\fB3DES(168)\fR, \fB\s-1RC4\s0(40)\fR, \fB\s-1RC4\s0(56)\fR, \fB\s-1RC4\s0(64)\fR, \fB\s-1RC4\s0(128)\fR, \&\fB\s-1RC2\s0(40)\fR, \fB\s-1RC2\s0(56)\fR, \fB\s-1RC2\s0(128)\fR, \fB\s-1IDEA\s0(128)\fR, \fBFortezza\fR, \fBNone\fR. .IP "Mac=<message authentication code>" 4 .IX Item "Mac=<message authentication code>" Message digest: \fB\s-1MD5\s0\fR, \fB\s-1SHA1\s0\fR. .IP "<export flag>" 4 .IX Item "<export flag>" If the cipher is flagged exportable with respect to old \s-1US\s0 crypto regulations, the word "\fBexport\fR" is printed. .SH "EXAMPLES" .IX Header "EXAMPLES" Some examples for the output of \fBSSL_CIPHER_description()\fR: .PP .Vb 4 \& 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 .Ve .PP A comp[lete list can be retrieved by invoking the following command: .PP .Vb 1 \& openssl ciphers \-v ALL .Ve .SH "BUGS" .IX Header "BUGS" If \fBSSL_CIPHER_description()\fR is called with \fBcipher\fR being \s-1NULL,\s0 the library crashes. .PP If \fBSSL_CIPHER_description()\fR cannot handle a built-in cipher, the according description of the cipher property is \fBunknown\fR. This case should not occur. .PP The standard terminology for ephemeral Diffie-Hellman schemes is \s-1DHE\s0 (finite field) or \s-1ECDHE\s0 (elliptic curve). This version of OpenSSL idiosyncratically reports these schemes as \s-1EDH\s0 and \s-1EECDH,\s0 even though it also accepts the standard terminology. .PP It is recommended to use the standard terminology (\s-1DHE\s0 and \s-1ECDHE\s0) during configuration (e.g. via SSL_CTX_set_cipher_list) for clarity of configuration. OpenSSL versions after 1.0.2 will report the standard terms via SSL_CIPHER_get_name and SSL_CIPHER_description. .SH "RETURN VALUES" .IX Header "RETURN VALUES" See \s-1DESCRIPTION\s0 .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBssl\fR\\|(3), \fBSSL_get_current_cipher\fR\\|(3), \&\fBSSL_get_ciphers\fR\\|(3), \fBciphers\fR\\|(1), \&\fBSSL_CTX_set_cipher_list\fR\\|(3) Back

Edit File : SSL_CIPHER_get_version.3 | Size : 9.21 KB

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.\" ========================================================================
.\"
.IX Title "SSL_CIPHER_get_name 3"
.TH SSL_CIPHER_get_name 3 "2019-12-20" "1.0.2u" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
SSL_CIPHER_get_name, SSL_CIPHER_get_bits, SSL_CIPHER_get_version, SSL_CIPHER_description \- get SSL_CIPHER properties
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #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(const SSL_CIPHER *cipher, char *buf, int size);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBSSL_CIPHER_get_name()\fR returns a pointer to the name of \fBcipher\fR. If the
argument is the \s-1NULL\s0 pointer, a pointer to the constant value \*(L"\s-1NONE\*(R"\s0 is
returned.
.PP
\&\fBSSL_CIPHER_get_bits()\fR returns the number of secret bits used for \fBcipher\fR. If
\&\fBalg_bits\fR is not \s-1NULL,\s0 it contains the number of bits processed by the
chosen algorithm. If \fBcipher\fR is \s-1NULL, 0\s0 is returned.
.PP
\&\fBSSL_CIPHER_get_version()\fR returns string which indicates the \s-1SSL/TLS\s0 protocol
version that first defined the cipher.
This is currently \fBSSLv2\fR or \fBTLSv1/SSLv3\fR.
In some cases it should possibly return \*(L"TLSv1.2\*(R" but does not;
use \fBSSL_CIPHER_description()\fR instead.
If \fBcipher\fR is \s-1NULL, \*(L"\s0(\s-1NONE\s0)\*(R" is returned.
.PP
\&\fBSSL_CIPHER_description()\fR returns a textual description of the cipher used
into the buffer \fBbuf\fR of length \fBlen\fR provided. \fBlen\fR must be at least
128 bytes, otherwise a pointer to the string \*(L"Buffer too small\*(R" is
returned. If \fBbuf\fR is \s-1NULL,\s0 a buffer of 128 bytes is allocated using
\&\fBOPENSSL_malloc()\fR. If the allocation fails, a pointer to the string
\&\*(L"OPENSSL_malloc Error\*(R" is returned.
.SH "NOTES"
.IX Header "NOTES"
The number of bits processed can be different from the secret bits. An
export cipher like e.g. \s-1EXP\-RC4\-MD5\s0 has only 40 secret bits. The algorithm
does use the full 128 bits (which would be returned for \fBalg_bits\fR), of
which however 88bits are fixed. The search space is hence only 40 bits.
.PP
The string returned by \fBSSL_CIPHER_description()\fR in case of success consists
of cleartext information separated by one or more blanks in the following
sequence:
.IP "<ciphername>" 4
.IX Item "<ciphername>"
Textual representation of the cipher name.
.IP "<protocol version>" 4
.IX Item "<protocol version>"
Protocol version: \fBSSLv2\fR, \fBSSLv3\fR, \fBTLSv1.2\fR. The TLSv1.0 ciphers are
flagged with SSLv3. No new ciphers were added by TLSv1.1.
.IP "Kx=<key exchange>" 4
.IX Item "Kx=<key exchange>"
Key exchange method: \fB\s-1RSA\s0\fR (for export ciphers as \fB\s-1RSA\s0(512)\fR or
\&\fB\s-1RSA\s0(1024)\fR), \fB\s-1DH\s0\fR (for export ciphers as \fB\s-1DH\s0(512)\fR or \fB\s-1DH\s0(1024)\fR),
\&\fB\s-1DH/RSA\s0\fR, \fB\s-1DH/DSS\s0\fR, \fBFortezza\fR.
.IP "Au=<authentication>" 4
.IX Item "Au=<authentication>"
Authentication method: \fB\s-1RSA\s0\fR, \fB\s-1DSS\s0\fR, \fB\s-1DH\s0\fR, \fBNone\fR. None is the
representation of anonymous ciphers.
.IP "Enc=<symmetric encryption method>" 4
.IX Item "Enc=<symmetric encryption method>"
Encryption method with number of secret bits: \fB\s-1DES\s0(40)\fR, \fB\s-1DES\s0(56)\fR,
\&\fB3DES(168)\fR, \fB\s-1RC4\s0(40)\fR, \fB\s-1RC4\s0(56)\fR, \fB\s-1RC4\s0(64)\fR, \fB\s-1RC4\s0(128)\fR,
\&\fB\s-1RC2\s0(40)\fR, \fB\s-1RC2\s0(56)\fR, \fB\s-1RC2\s0(128)\fR, \fB\s-1IDEA\s0(128)\fR, \fBFortezza\fR, \fBNone\fR.
.IP "Mac=<message authentication code>" 4
.IX Item "Mac=<message authentication code>"
Message digest: \fB\s-1MD5\s0\fR, \fB\s-1SHA1\s0\fR.
.IP "<export flag>" 4
.IX Item "<export flag>"
If the cipher is flagged exportable with respect to old \s-1US\s0 crypto
regulations, the word "\fBexport\fR" is printed.
.SH "EXAMPLES"
.IX Header "EXAMPLES"
Some examples for the output of \fBSSL_CIPHER_description()\fR:
.PP
.Vb 4
\& 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
.Ve
.PP
A comp[lete list can be retrieved by invoking the following command:
.PP
.Vb 1
\& openssl ciphers \-v ALL
.Ve
.SH "BUGS"
.IX Header "BUGS"
If \fBSSL_CIPHER_description()\fR is called with \fBcipher\fR being \s-1NULL,\s0 the
library crashes.
.PP
If \fBSSL_CIPHER_description()\fR cannot handle a built-in cipher, the according
description of the cipher property is \fBunknown\fR. This case should not
occur.
.PP
The standard terminology for ephemeral Diffie-Hellman schemes is \s-1DHE\s0
(finite field) or \s-1ECDHE\s0 (elliptic curve).  This version of OpenSSL
idiosyncratically reports these schemes as \s-1EDH\s0 and \s-1EECDH,\s0 even though
it also accepts the standard terminology.
.PP
It is recommended to use the standard terminology (\s-1DHE\s0 and \s-1ECDHE\s0)
during configuration (e.g. via SSL_CTX_set_cipher_list) for clarity of
configuration.  OpenSSL versions after 1.0.2 will report the standard
terms via SSL_CIPHER_get_name and SSL_CIPHER_description.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
See \s-1DESCRIPTION\s0
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBssl\fR\|(3), \fBSSL_get_current_cipher\fR\|(3),
\&\fBSSL_get_ciphers\fR\|(3), \fBciphers\fR\|(1),
\&\fBSSL_CTX_set_cipher_list\fR\|(3)

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