454 lines
12 KiB
C
454 lines
12 KiB
C
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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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#include <assert.h>
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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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assert (in && out && key && ivec);
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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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assert (in && out && key && ivec);
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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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assert (in && out && key && ivec);
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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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#if defined(CBC_HANDLES_TRUNCATED_IO)
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memcpy(tmp.c,out-16,16);
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(*cbc)(in,out-16,residue,key,ivec,1);
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memcpy(out,tmp.c,residue);
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#else
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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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#endif
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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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assert (in && out && key && ivec);
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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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#if defined(CBC_HANDLES_TRUNCATED_IO)
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(*cbc)(in,out-16+residue,residue,key,ivec,1);
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#else
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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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#endif
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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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assert (in && out && key && ivec);
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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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assert (in && out && key && ivec);
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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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assert (in && out && key && ivec);
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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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#if defined(CBC_HANDLES_TRUNCATED_IO)
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(*cbc)(tmp.c,out,16+residue,key,ivec,0);
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#else
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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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#endif
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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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assert (in && out && key && ivec);
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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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#if defined(CBC_HANDLES_TRUNCATED_IO)
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(*cbc)(tmp.c,out,16+residue,key,ivec,0);
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#else
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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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#endif
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return 16+len+residue;
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}
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#if defined(SELFTEST)
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#include <stdio.h>
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#include <openssl/aes.h>
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/* test vectors from RFC 3962 */
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static const unsigned char test_key[16] = "chicken teriyaki";
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static const unsigned char test_input[64] =
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"I would like the" " General Gau's C"
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"hicken, please, " "and wonton soup.";
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static const unsigned char test_iv[16] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
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static const unsigned char vector_17[17] =
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{0xc6,0x35,0x35,0x68,0xf2,0xbf,0x8c,0xb4, 0xd8,0xa5,0x80,0x36,0x2d,0xa7,0xff,0x7f,
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0x97};
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static const unsigned char vector_31[31] =
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{0xfc,0x00,0x78,0x3e,0x0e,0xfd,0xb2,0xc1, 0xd4,0x45,0xd4,0xc8,0xef,0xf7,0xed,0x22,
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0x97,0x68,0x72,0x68,0xd6,0xec,0xcc,0xc0, 0xc0,0x7b,0x25,0xe2,0x5e,0xcf,0xe5};
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static const unsigned char vector_32[32] =
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{0x39,0x31,0x25,0x23,0xa7,0x86,0x62,0xd5, 0xbe,0x7f,0xcb,0xcc,0x98,0xeb,0xf5,0xa8,
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0x97,0x68,0x72,0x68,0xd6,0xec,0xcc,0xc0, 0xc0,0x7b,0x25,0xe2,0x5e,0xcf,0xe5,0x84};
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static const unsigned char vector_47[47] =
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{0x97,0x68,0x72,0x68,0xd6,0xec,0xcc,0xc0, 0xc0,0x7b,0x25,0xe2,0x5e,0xcf,0xe5,0x84,
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0xb3,0xff,0xfd,0x94,0x0c,0x16,0xa1,0x8c, 0x1b,0x55,0x49,0xd2,0xf8,0x38,0x02,0x9e,
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0x39,0x31,0x25,0x23,0xa7,0x86,0x62,0xd5, 0xbe,0x7f,0xcb,0xcc,0x98,0xeb,0xf5};
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static const unsigned char vector_48[48] =
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{0x97,0x68,0x72,0x68,0xd6,0xec,0xcc,0xc0, 0xc0,0x7b,0x25,0xe2,0x5e,0xcf,0xe5,0x84,
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0x9d,0xad,0x8b,0xbb,0x96,0xc4,0xcd,0xc0, 0x3b,0xc1,0x03,0xe1,0xa1,0x94,0xbb,0xd8,
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0x39,0x31,0x25,0x23,0xa7,0x86,0x62,0xd5, 0xbe,0x7f,0xcb,0xcc,0x98,0xeb,0xf5,0xa8};
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static const unsigned char vector_64[64] =
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{0x97,0x68,0x72,0x68,0xd6,0xec,0xcc,0xc0, 0xc0,0x7b,0x25,0xe2,0x5e,0xcf,0xe5,0x84,
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0x39,0x31,0x25,0x23,0xa7,0x86,0x62,0xd5, 0xbe,0x7f,0xcb,0xcc,0x98,0xeb,0xf5,0xa8,
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0x48,0x07,0xef,0xe8,0x36,0xee,0x89,0xa5, 0x26,0x73,0x0d,0xbc,0x2f,0x7b,0xc8,0x40,
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0x9d,0xad,0x8b,0xbb,0x96,0xc4,0xcd,0xc0, 0x3b,0xc1,0x03,0xe1,0xa1,0x94,0xbb,0xd8};
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static AES_KEY encks, decks;
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||
|
|
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||
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void test_vector(const unsigned char *vector,size_t len)
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||
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{ unsigned char iv[sizeof(test_iv)];
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||
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unsigned char cleartext[64],ciphertext[64];
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||
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size_t tail;
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||
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||
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printf("vector_%d\n",len); fflush(stdout);
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||
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||
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if ((tail=len%16) == 0) tail = 16;
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||
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tail += 16;
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||
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|
|
||
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/* test block-based encryption */
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||
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memcpy(iv,test_iv,sizeof(test_iv));
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CRYPTO_cts128_encrypt_block(test_input,ciphertext,len,&encks,iv,(block128_f)AES_encrypt);
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if (memcmp(ciphertext,vector,len))
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||
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fprintf(stderr,"output_%d mismatch\n",len), exit(1);
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||
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if (memcmp(iv,vector+len-tail,sizeof(iv)))
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||
|
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fprintf(stderr,"iv_%d mismatch\n",len), exit(1);
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||
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|
|
||
|
|
/* test block-based decryption */
|
||
|
|
memcpy(iv,test_iv,sizeof(test_iv));
|
||
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CRYPTO_cts128_decrypt_block(ciphertext,cleartext,len,&decks,iv,(block128_f)AES_decrypt);
|
||
|
|
if (memcmp(cleartext,test_input,len))
|
||
|
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fprintf(stderr,"input_%d mismatch\n",len), exit(2);
|
||
|
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if (memcmp(iv,vector+len-tail,sizeof(iv)))
|
||
|
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fprintf(stderr,"iv_%d mismatch\n",len), exit(2);
|
||
|
|
|
||
|
|
/* test streamed encryption */
|
||
|
|
memcpy(iv,test_iv,sizeof(test_iv));
|
||
|
|
CRYPTO_cts128_encrypt(test_input,ciphertext,len,&encks,iv,(cbc128_f)AES_cbc_encrypt);
|
||
|
|
if (memcmp(ciphertext,vector,len))
|
||
|
|
fprintf(stderr,"output_%d mismatch\n",len), exit(3);
|
||
|
|
if (memcmp(iv,vector+len-tail,sizeof(iv)))
|
||
|
|
fprintf(stderr,"iv_%d mismatch\n",len), exit(3);
|
||
|
|
|
||
|
|
/* test streamed decryption */
|
||
|
|
memcpy(iv,test_iv,sizeof(test_iv));
|
||
|
|
CRYPTO_cts128_decrypt(ciphertext,cleartext,len,&decks,iv,(cbc128_f)AES_cbc_encrypt);
|
||
|
|
if (memcmp(cleartext,test_input,len))
|
||
|
|
fprintf(stderr,"input_%d mismatch\n",len), exit(4);
|
||
|
|
if (memcmp(iv,vector+len-tail,sizeof(iv)))
|
||
|
|
fprintf(stderr,"iv_%d mismatch\n",len), exit(4);
|
||
|
|
}
|
||
|
|
|
||
|
|
void test_nistvector(const unsigned char *vector,size_t len)
|
||
|
|
{ unsigned char iv[sizeof(test_iv)];
|
||
|
|
unsigned char cleartext[64],ciphertext[64],nistvector[64];
|
||
|
|
size_t tail;
|
||
|
|
|
||
|
|
printf("nistvector_%d\n",len); fflush(stdout);
|
||
|
|
|
||
|
|
if ((tail=len%16) == 0) tail = 16;
|
||
|
|
|
||
|
|
len -= 16 + tail;
|
||
|
|
memcpy(nistvector,vector,len);
|
||
|
|
/* flip two last blocks */
|
||
|
|
memcpy(nistvector+len,vector+len+16,tail);
|
||
|
|
memcpy(nistvector+len+tail,vector+len,16);
|
||
|
|
len += 16 + tail;
|
||
|
|
tail = 16;
|
||
|
|
|
||
|
|
/* test block-based encryption */
|
||
|
|
memcpy(iv,test_iv,sizeof(test_iv));
|
||
|
|
CRYPTO_nistcts128_encrypt_block(test_input,ciphertext,len,&encks,iv,(block128_f)AES_encrypt);
|
||
|
|
if (memcmp(ciphertext,nistvector,len))
|
||
|
|
fprintf(stderr,"output_%d mismatch\n",len), exit(1);
|
||
|
|
if (memcmp(iv,nistvector+len-tail,sizeof(iv)))
|
||
|
|
fprintf(stderr,"iv_%d mismatch\n",len), exit(1);
|
||
|
|
|
||
|
|
/* test block-based decryption */
|
||
|
|
memcpy(iv,test_iv,sizeof(test_iv));
|
||
|
|
CRYPTO_nistcts128_decrypt_block(ciphertext,cleartext,len,&decks,iv,(block128_f)AES_decrypt);
|
||
|
|
if (memcmp(cleartext,test_input,len))
|
||
|
|
fprintf(stderr,"input_%d mismatch\n",len), exit(2);
|
||
|
|
if (memcmp(iv,nistvector+len-tail,sizeof(iv)))
|
||
|
|
fprintf(stderr,"iv_%d mismatch\n",len), exit(2);
|
||
|
|
|
||
|
|
/* test streamed encryption */
|
||
|
|
memcpy(iv,test_iv,sizeof(test_iv));
|
||
|
|
CRYPTO_nistcts128_encrypt(test_input,ciphertext,len,&encks,iv,(cbc128_f)AES_cbc_encrypt);
|
||
|
|
if (memcmp(ciphertext,nistvector,len))
|
||
|
|
fprintf(stderr,"output_%d mismatch\n",len), exit(3);
|
||
|
|
if (memcmp(iv,nistvector+len-tail,sizeof(iv)))
|
||
|
|
fprintf(stderr,"iv_%d mismatch\n",len), exit(3);
|
||
|
|
|
||
|
|
/* test streamed decryption */
|
||
|
|
memcpy(iv,test_iv,sizeof(test_iv));
|
||
|
|
CRYPTO_nistcts128_decrypt(ciphertext,cleartext,len,&decks,iv,(cbc128_f)AES_cbc_encrypt);
|
||
|
|
if (memcmp(cleartext,test_input,len))
|
||
|
|
fprintf(stderr,"input_%d mismatch\n",len), exit(4);
|
||
|
|
if (memcmp(iv,nistvector+len-tail,sizeof(iv)))
|
||
|
|
fprintf(stderr,"iv_%d mismatch\n",len), exit(4);
|
||
|
|
}
|
||
|
|
|
||
|
|
int main()
|
||
|
|
{
|
||
|
|
AES_set_encrypt_key(test_key,128,&encks);
|
||
|
|
AES_set_decrypt_key(test_key,128,&decks);
|
||
|
|
|
||
|
|
test_vector(vector_17,sizeof(vector_17));
|
||
|
|
test_vector(vector_31,sizeof(vector_31));
|
||
|
|
test_vector(vector_32,sizeof(vector_32));
|
||
|
|
test_vector(vector_47,sizeof(vector_47));
|
||
|
|
test_vector(vector_48,sizeof(vector_48));
|
||
|
|
test_vector(vector_64,sizeof(vector_64));
|
||
|
|
|
||
|
|
test_nistvector(vector_17,sizeof(vector_17));
|
||
|
|
test_nistvector(vector_31,sizeof(vector_31));
|
||
|
|
test_nistvector(vector_32,sizeof(vector_32));
|
||
|
|
test_nistvector(vector_47,sizeof(vector_47));
|
||
|
|
test_nistvector(vector_48,sizeof(vector_48));
|
||
|
|
test_nistvector(vector_64,sizeof(vector_64));
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
#endif
|