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268 lines
5.9 KiB
C
Executable File
268 lines
5.9 KiB
C
Executable File
/* $OpenBSD: cts128.c,v 1.5 2015/07/19 18:27:26 miod Exp $ */
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/* ====================================================================
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* Copyright (c) 2008 The OpenSSL Project. All rights reserved.
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*
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* Rights for redistribution and usage in source and binary
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* forms are granted according to the OpenSSL license.
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*/
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#include <openssl/crypto.h>
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#include "modes_lcl.h"
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#include <string.h>
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#ifndef MODES_DEBUG
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# ifndef NDEBUG
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# define NDEBUG
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# endif
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#endif
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/*
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* Trouble with Ciphertext Stealing, CTS, mode is that there is no
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* common official specification, but couple of cipher/application
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* specific ones: RFC2040 and RFC3962. Then there is 'Proposal to
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* Extend CBC Mode By "Ciphertext Stealing"' at NIST site, which
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* deviates from mentioned RFCs. Most notably it allows input to be
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* of block length and it doesn't flip the order of the last two
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* blocks. CTS is being discussed even in ECB context, but it's not
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* adopted for any known application. This implementation provides
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* two interfaces: one compliant with above mentioned RFCs and one
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* compliant with the NIST proposal, both extending CBC mode.
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*/
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size_t CRYPTO_cts128_encrypt_block(const unsigned char *in, unsigned char *out,
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size_t len, const void *key,
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unsigned char ivec[16], block128_f block)
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{ size_t residue, n;
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if (len <= 16) return 0;
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if ((residue=len%16) == 0) residue = 16;
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len -= residue;
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CRYPTO_cbc128_encrypt(in,out,len,key,ivec,block);
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in += len;
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out += len;
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for (n=0; n<residue; ++n)
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ivec[n] ^= in[n];
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(*block)(ivec,ivec,key);
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memcpy(out,out-16,residue);
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memcpy(out-16,ivec,16);
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return len+residue;
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}
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size_t CRYPTO_nistcts128_encrypt_block(const unsigned char *in, unsigned char *out,
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size_t len, const void *key,
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unsigned char ivec[16], block128_f block)
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{ size_t residue, n;
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if (len < 16) return 0;
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residue=len%16;
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len -= residue;
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CRYPTO_cbc128_encrypt(in,out,len,key,ivec,block);
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if (residue==0) return len;
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in += len;
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out += len;
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for (n=0; n<residue; ++n)
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ivec[n] ^= in[n];
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(*block)(ivec,ivec,key);
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memcpy(out-16+residue,ivec,16);
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return len+residue;
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}
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size_t CRYPTO_cts128_encrypt(const unsigned char *in, unsigned char *out,
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size_t len, const void *key,
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unsigned char ivec[16], cbc128_f cbc)
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{ size_t residue;
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union { size_t align; unsigned char c[16]; } tmp;
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if (len <= 16) return 0;
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if ((residue=len%16) == 0) residue = 16;
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len -= residue;
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(*cbc)(in,out,len,key,ivec,1);
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in += len;
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out += len;
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memset(tmp.c,0,sizeof(tmp));
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memcpy(tmp.c,in,residue);
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memcpy(out,out-16,residue);
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(*cbc)(tmp.c,out-16,16,key,ivec,1);
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return len+residue;
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}
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size_t CRYPTO_nistcts128_encrypt(const unsigned char *in, unsigned char *out,
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size_t len, const void *key,
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unsigned char ivec[16], cbc128_f cbc)
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{ size_t residue;
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union { size_t align; unsigned char c[16]; } tmp;
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if (len < 16) return 0;
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residue=len%16;
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len -= residue;
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(*cbc)(in,out,len,key,ivec,1);
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if (residue==0) return len;
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in += len;
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out += len;
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memset(tmp.c,0,sizeof(tmp));
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memcpy(tmp.c,in,residue);
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(*cbc)(tmp.c,out-16+residue,16,key,ivec,1);
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return len+residue;
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}
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size_t CRYPTO_cts128_decrypt_block(const unsigned char *in, unsigned char *out,
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size_t len, const void *key,
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unsigned char ivec[16], block128_f block)
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{ size_t residue, n;
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union { size_t align; unsigned char c[32]; } tmp;
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if (len<=16) return 0;
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if ((residue=len%16) == 0) residue = 16;
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len -= 16+residue;
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if (len) {
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CRYPTO_cbc128_decrypt(in,out,len,key,ivec,block);
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in += len;
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out += len;
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}
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(*block)(in,tmp.c+16,key);
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memcpy(tmp.c,tmp.c+16,16);
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memcpy(tmp.c,in+16,residue);
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(*block)(tmp.c,tmp.c,key);
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for(n=0; n<16; ++n) {
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unsigned char c = in[n];
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out[n] = tmp.c[n] ^ ivec[n];
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ivec[n] = c;
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}
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for(residue+=16; n<residue; ++n)
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out[n] = tmp.c[n] ^ in[n];
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return 16+len+residue;
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}
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size_t CRYPTO_nistcts128_decrypt_block(const unsigned char *in, unsigned char *out,
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size_t len, const void *key,
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unsigned char ivec[16], block128_f block)
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{ size_t residue, n;
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union { size_t align; unsigned char c[32]; } tmp;
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if (len<16) return 0;
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residue=len%16;
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if (residue==0) {
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CRYPTO_cbc128_decrypt(in,out,len,key,ivec,block);
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return len;
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}
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len -= 16+residue;
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if (len) {
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CRYPTO_cbc128_decrypt(in,out,len,key,ivec,block);
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in += len;
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out += len;
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}
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(*block)(in+residue,tmp.c+16,key);
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memcpy(tmp.c,tmp.c+16,16);
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memcpy(tmp.c,in,residue);
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(*block)(tmp.c,tmp.c,key);
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for(n=0; n<16; ++n) {
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unsigned char c = in[n];
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out[n] = tmp.c[n] ^ ivec[n];
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ivec[n] = in[n+residue];
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tmp.c[n] = c;
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}
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for(residue+=16; n<residue; ++n)
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out[n] = tmp.c[n] ^ tmp.c[n-16];
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return 16+len+residue;
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}
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size_t CRYPTO_cts128_decrypt(const unsigned char *in, unsigned char *out,
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size_t len, const void *key,
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unsigned char ivec[16], cbc128_f cbc)
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{ size_t residue;
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union { size_t align; unsigned char c[32]; } tmp;
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if (len<=16) return 0;
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if ((residue=len%16) == 0) residue = 16;
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len -= 16+residue;
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if (len) {
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(*cbc)(in,out,len,key,ivec,0);
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in += len;
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out += len;
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}
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memset(tmp.c,0,sizeof(tmp));
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/* this places in[16] at &tmp.c[16] and decrypted block at &tmp.c[0] */
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(*cbc)(in,tmp.c,16,key,tmp.c+16,0);
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memcpy(tmp.c,in+16,residue);
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(*cbc)(tmp.c,tmp.c,32,key,ivec,0);
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memcpy(out,tmp.c,16+residue);
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return 16+len+residue;
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}
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size_t CRYPTO_nistcts128_decrypt(const unsigned char *in, unsigned char *out,
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size_t len, const void *key,
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unsigned char ivec[16], cbc128_f cbc)
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{ size_t residue;
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union { size_t align; unsigned char c[32]; } tmp;
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if (len<16) return 0;
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residue=len%16;
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if (residue==0) {
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(*cbc)(in,out,len,key,ivec,0);
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return len;
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}
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len -= 16+residue;
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if (len) {
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(*cbc)(in,out,len,key,ivec,0);
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in += len;
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out += len;
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}
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memset(tmp.c,0,sizeof(tmp));
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/* this places in[16] at &tmp.c[16] and decrypted block at &tmp.c[0] */
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(*cbc)(in+residue,tmp.c,16,key,tmp.c+16,0);
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memcpy(tmp.c,in,residue);
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(*cbc)(tmp.c,tmp.c,32,key,ivec,0);
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memcpy(out,tmp.c,16+residue);
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return 16+len+residue;
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}
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