des(3) - Plan 9 from User Space

From adc93f6097615f16d57e8a24a256302f2144ec4e Mon Sep 17 00:00:00 2001 From: rsc Date: Fri, 14 Jan 2005 17:37:50 +0000 Subject: cut out the html - they're going to cause diffing problems. --- man/man3/des.html | 170 ------------------------------------------------------ 1 file changed, 170 deletions(-) delete mode 100644 man/man3/des.html (limited to 'man/man3/des.html') diff --git a/man/man3/des.html b/man/man3/des.html deleted file mode 100644 index 0752e8c8..00000000 --- a/man/man3/des.html +++ /dev/null @@ -1,170 +0,0 @@ - -des(3) - Plan 9 from User Space - - - - -

DES(3) DES(3) -

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NAME
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- - setupDESstate, des_key_setup, block_cipher, desCBCencrypt, desCBCdecrypt, - desECBencrypt, desECBdecrypt, des3CBCencrypt, des3CBCdecrypt, - des3ECBencrypt, des3ECBdecrypt, key_setup, des56to64, des64to56, - setupDES3state, triple_block_cipher, - single and triple digital - encryption standard - -
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SYNOPSIS
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- - #include <u.h> - #include <libc.h> - #include <mp.h> - #include <libsec.h> - - - void des_key_setup(uchar key[8], ulong schedule[32]) - - - void block_cipher(ulong *schedule, uchar *data, int decrypting) - - - - void setupDESstate(DESstate *s, uchar key[8], uchar *ivec) - - - void desCBCencrypt(uchar*, int, DESstate*) - - - void desCBCdecrypt(uchar*, int, DESstate*) - - - void desECBencrypt(uchar*, int, DESstate*) - - - void desECBdecrypt(uchar*, int, DESstate*) - - - void triple_block_cipher(ulong keys[3][32], uchar*, int) - - - void setupDES3state(DES3state *s, uchar key[3][8], uchar *ivec) - - - - void des3CBCencrypt(uchar*, int, DES3state*) - - - void des3CBCdecrypt(uchar*, int, DES3state*) - - - void des3ECBencrypt(uchar*, int, DES3state*) - - - void des3ECBdecrypt(uchar*, int, DES3state*) - - - void key_setup(uchar[7], ulong[32]) - - - void des56to64(uchar *k56, uchar *k64) - - - void des64to56(uchar *k64, uchar *k56) - -
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DESCRIPTION
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- - The Digital Encryption Standard (DES) is a shared key or symmetric - encryption using either a 56 bit key for single DES or three 56 - bit keys for triple des. The keys are encoded into 64 bits where - every eight bit is parity. -
- - The basic DES function, block_cipher, works on a block of 8 bytes, - converting them in place. It takes a key schedule, a pointer to - the block, and a flag indicating encrypting (0) or decrypting - (1). The key schedule is created from the key using des_key_setup. - -
- - Since it is a bit awkward, block_cipher is rarely called directly. - Instead, one normally uses routines that encrypt larger buffers - of data and which may chain the encryption state from one buffer - to the next. These routines keep track of the state of the encryption - using a DESstate structure that contains the key - schedule and any chained state. SetupDESstate sets up the DESstate - structure using the key and an 8 byte initialization vector. -
- - Electronic code book, using desECBencrypt and desECBdecrypt, is - the less secure mode. The encryption of each 8 bytes does not - depend on the encryption of any other. Hence the encryption is - a substitution cipher using 64 bit characters. -
- - Cipher block chaining mode, using desCBCencrypt and desCBCdecrypt, - is more secure. Every block encrypted depends on the initialization - vector and all blocks encrypted before it. -
- - For both CBC and ECB modes, a stream of data can be encrypted - as multiple buffers. However, all buffers except the last must - be a multiple of 8 bytes to ensure successful decryption of the - stream. -
- - There are equivalent triple DES functions for each of the DES - functions. -
- - In the past Plan 9 used a 56 bit or 7 byte format for DES keys. - To be compatible with the rest of the world, we’ve abandoned this - format. There are two functions: des56to64 and des64to56 to convert - back and forth between the two formats. Also a key schedule can - be set up from the 7 byte format using key_setup. -
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SOURCE
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- - /usr/local/plan9/src/libsec - -
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SEE ALSO
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- - mp(3), aes(3), blowfish(3), dsa(3), elgamal(3), rc4(3), rsa(3), - sechash(3), prime(3), rand(3)
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