-/* ====================================================================
- * Copyright (c) 2008 The OpenSSL Project. All rights reserved.
+/*
+ * Copyright 2008-2016 The OpenSSL Project Authors. All Rights Reserved.
*
- * Rights for redistribution and usage in source and binary
- * forms are granted according to the OpenSSL license.
+ * Licensed under the OpenSSL license (the "License"). You may not use
+ * this file except in compliance with the License. You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
*/
-#include "modes.h"
+#include <openssl/crypto.h>
+#include "modes_lcl.h"
#include <string.h>
-#ifndef MODES_DEBUG
-# ifndef NDEBUG
-# define NDEBUG
-# endif
-#endif
-#include <assert.h>
-
/*
* Trouble with Ciphertext Stealing, CTS, mode is that there is no
* common official specification, but couple of cipher/application
* deviates from mentioned RFCs. Most notably it allows input to be
* of block length and it doesn't flip the order of the last two
* blocks. CTS is being discussed even in ECB context, but it's not
- * adopted for any known application. This implementation complies
- * with mentioned RFCs and [as such] extends CBC mode.
+ * adopted for any known application. This implementation provides
+ * two interfaces: one compliant with above mentioned RFCs and one
+ * compliant with the NIST proposal, both extending CBC mode.
*/
-size_t CRYPTO_cts128_encrypt_block(const unsigned char *in, unsigned char *out,
- size_t len, const void *key,
- unsigned char ivec[16], block128_f block)
-{ size_t residue, n;
+size_t CRYPTO_cts128_encrypt_block(const unsigned char *in,
+ unsigned char *out, size_t len,
+ const void *key, unsigned char ivec[16],
+ block128_f block)
+{
+ size_t residue, n;
+
+ if (len <= 16)
+ return 0;
+
+ if ((residue = len % 16) == 0)
+ residue = 16;
- assert (in && out && key && ivec);
+ len -= residue;
- if (len <= 16) return 0;
+ CRYPTO_cbc128_encrypt(in, out, len, key, ivec, block);
+
+ in += len;
+ out += len;
+
+ for (n = 0; n < residue; ++n)
+ ivec[n] ^= in[n];
+ (*block) (ivec, ivec, key);
+ memcpy(out, out - 16, residue);
+ memcpy(out - 16, ivec, 16);
+
+ return len + residue;
+}
+
+size_t CRYPTO_nistcts128_encrypt_block(const unsigned char *in,
+ unsigned char *out, size_t len,
+ const void *key,
+ unsigned char ivec[16],
+ block128_f block)
+{
+ size_t residue, n;
- if ((residue=len%16) == 0) residue = 16;
+ if (len < 16)
+ return 0;
- len -= residue;
+ residue = len % 16;
- CRYPTO_cbc128_encrypt(in,out,len,key,ivec,block);
+ len -= residue;
- in += len;
- out += len;
+ CRYPTO_cbc128_encrypt(in, out, len, key, ivec, block);
- for (n=0; n<residue; ++n)
- ivec[n] ^= in[n];
- (*block)(ivec,ivec,key);
- memcpy(out,out-16,residue);
- memcpy(out-16,ivec,16);
+ if (residue == 0)
+ return len;
- return len+residue;
+ in += len;
+ out += len;
+
+ for (n = 0; n < residue; ++n)
+ ivec[n] ^= in[n];
+ (*block) (ivec, ivec, key);
+ memcpy(out - 16 + residue, ivec, 16);
+
+ return len + residue;
}
size_t CRYPTO_cts128_encrypt(const unsigned char *in, unsigned char *out,
- size_t len, const void *key,
- unsigned char ivec[16], cbc128_f cbc)
-{ size_t residue;
- union { size_t align; unsigned char c[16]; } tmp;
+ size_t len, const void *key,
+ unsigned char ivec[16], cbc128_f cbc)
+{
+ size_t residue;
+ union {
+ size_t align;
+ unsigned char c[16];
+ } tmp;
- assert (in && out && key && ivec);
+ if (len <= 16)
+ return 0;
- if (len <= 16) return 0;
+ if ((residue = len % 16) == 0)
+ residue = 16;
- if ((residue=len%16) == 0) residue = 16;
+ len -= residue;
- len -= residue;
+ (*cbc) (in, out, len, key, ivec, 1);
+
+ in += len;
+ out += len;
+
+#if defined(CBC_HANDLES_TRUNCATED_IO)
+ memcpy(tmp.c, out - 16, 16);
+ (*cbc) (in, out - 16, residue, key, ivec, 1);
+ memcpy(out, tmp.c, residue);
+#else
+ memset(tmp.c, 0, sizeof(tmp));
+ memcpy(tmp.c, in, residue);
+ memcpy(out, out - 16, residue);
+ (*cbc) (tmp.c, out - 16, 16, key, ivec, 1);
+#endif
+ return len + residue;
+}
+
+size_t CRYPTO_nistcts128_encrypt(const unsigned char *in, unsigned char *out,
+ size_t len, const void *key,
+ unsigned char ivec[16], cbc128_f cbc)
+{
+ size_t residue;
+ union {
+ size_t align;
+ unsigned char c[16];
+ } tmp;
- (*cbc)(in,out,len,key,ivec,1);
+ if (len < 16)
+ return 0;
- in += len;
- out += len;
+ residue = len % 16;
+
+ len -= residue;
+
+ (*cbc) (in, out, len, key, ivec, 1);
+
+ if (residue == 0)
+ return len;
+
+ in += len;
+ out += len;
#if defined(CBC_HANDLES_TRUNCATED_IO)
- memcpy(tmp.c,out-16,16);
- (*cbc)(in,out-16,residue,key,ivec,1);
- memcpy(out,tmp.c,residue);
+ (*cbc) (in, out - 16 + residue, residue, key, ivec, 1);
#else
- {
- size_t n;
- for (n=0; n<16; n+=sizeof(size_t))
- *(size_t *)(tmp.c+n) = 0;
- memcpy(tmp.c,in,residue);
- }
- memcpy(out,out-16,residue);
- (*cbc)(tmp.c,out-16,16,key,ivec,1);
+ memset(tmp.c, 0, sizeof(tmp));
+ memcpy(tmp.c, in, residue);
+ (*cbc) (tmp.c, out - 16 + residue, 16, key, ivec, 1);
#endif
- return len+residue;
+ return len + residue;
}
-size_t CRYPTO_cts128_decrypt_block(const unsigned char *in, unsigned char *out,
- size_t len, const void *key,
- unsigned char ivec[16], block128_f block)
-{ size_t residue, n;
- union { size_t align; unsigned char c[32]; } tmp;
+size_t CRYPTO_cts128_decrypt_block(const unsigned char *in,
+ unsigned char *out, size_t len,
+ const void *key, unsigned char ivec[16],
+ block128_f block)
+{
+ size_t residue, n;
+ union {
+ size_t align;
+ unsigned char c[32];
+ } tmp;
- assert (in && out && key && ivec);
+ if (len <= 16)
+ return 0;
- if (len<=16) return 0;
+ if ((residue = len % 16) == 0)
+ residue = 16;
- if ((residue=len%16) == 0) residue = 16;
+ len -= 16 + residue;
- len -= 16+residue;
+ if (len) {
+ CRYPTO_cbc128_decrypt(in, out, len, key, ivec, block);
+ in += len;
+ out += len;
+ }
- if (len) {
- CRYPTO_cbc128_decrypt(in,out,len,key,ivec,block);
- in += len;
- out += len;
- }
+ (*block) (in, tmp.c + 16, key);
- (*block)(in,tmp.c+16,key);
+ memcpy(tmp.c, tmp.c + 16, 16);
+ memcpy(tmp.c, in + 16, residue);
+ (*block) (tmp.c, tmp.c, key);
- for (n=0; n<16; n+=sizeof(size_t))
- *(size_t *)(tmp.c+n) = *(size_t *)(tmp.c+16+n);
- memcpy(tmp.c,in+16,residue);
- (*block)(tmp.c,tmp.c,key);
+ for (n = 0; n < 16; ++n) {
+ unsigned char c = in[n];
+ out[n] = tmp.c[n] ^ ivec[n];
+ ivec[n] = c;
+ }
+ for (residue += 16; n < residue; ++n)
+ out[n] = tmp.c[n] ^ in[n];
- for(n=0; n<16; ++n) {
- unsigned char c = in[n];
- out[n] = tmp.c[n] ^ ivec[n];
- ivec[n] = c;
- }
- for(residue+=16; n<residue; ++n)
- out[n] = tmp.c[n] ^ in[n];
+ return 16 + len + residue;
+}
- return len+residue-16;
+size_t CRYPTO_nistcts128_decrypt_block(const unsigned char *in,
+ unsigned char *out, size_t len,
+ const void *key,
+ unsigned char ivec[16],
+ block128_f block)
+{
+ size_t residue, n;
+ union {
+ size_t align;
+ unsigned char c[32];
+ } tmp;
+
+ if (len < 16)
+ return 0;
+
+ residue = len % 16;
+
+ if (residue == 0) {
+ CRYPTO_cbc128_decrypt(in, out, len, key, ivec, block);
+ return len;
+ }
+
+ len -= 16 + residue;
+
+ if (len) {
+ CRYPTO_cbc128_decrypt(in, out, len, key, ivec, block);
+ in += len;
+ out += len;
+ }
+
+ (*block) (in + residue, tmp.c + 16, key);
+
+ memcpy(tmp.c, tmp.c + 16, 16);
+ memcpy(tmp.c, in, residue);
+ (*block) (tmp.c, tmp.c, key);
+
+ for (n = 0; n < 16; ++n) {
+ unsigned char c = in[n];
+ out[n] = tmp.c[n] ^ ivec[n];
+ ivec[n] = in[n + residue];
+ tmp.c[n] = c;
+ }
+ for (residue += 16; n < residue; ++n)
+ out[n] = tmp.c[n] ^ tmp.c[n - 16];
+
+ return 16 + len + residue;
}
size_t CRYPTO_cts128_decrypt(const unsigned char *in, unsigned char *out,
- size_t len, const void *key,
- unsigned char ivec[16], cbc128_f cbc)
-{ size_t residue, n;
- union { size_t align; unsigned char c[32]; } tmp;
-
- assert (in && out && key && ivec);
+ size_t len, const void *key,
+ unsigned char ivec[16], cbc128_f cbc)
+{
+ size_t residue;
+ union {
+ size_t align;
+ unsigned char c[32];
+ } tmp;
- if (len<=16) return 0;
+ if (len <= 16)
+ return 0;
- if ((residue=len%16) == 0) residue = 16;
+ if ((residue = len % 16) == 0)
+ residue = 16;
- len -= 16+residue;
+ len -= 16 + residue;
- if (len) {
- (*cbc)(in,out,len,key,ivec,0);
- in += len;
- out += len;
- }
+ if (len) {
+ (*cbc) (in, out, len, key, ivec, 0);
+ in += len;
+ out += len;
+ }
- for (n=16; n<32; n+=sizeof(size_t))
- *(size_t *)(tmp.c+n) = 0;
- /* this places in[16] at &tmp.c[16] and decrypted block at &tmp.c[0] */
- (*cbc)(in,tmp.c,16,key,tmp.c+16,0);
+ memset(tmp.c, 0, sizeof(tmp));
+ /*
+ * this places in[16] at &tmp.c[16] and decrypted block at &tmp.c[0]
+ */
+ (*cbc) (in, tmp.c, 16, key, tmp.c + 16, 0);
- memcpy(tmp.c,in+16,residue);
+ memcpy(tmp.c, in + 16, residue);
#if defined(CBC_HANDLES_TRUNCATED_IO)
- (*cbc)(tmp.c,out,16+residue,key,ivec,0);
+ (*cbc) (tmp.c, out, 16 + residue, key, ivec, 0);
#else
- (*cbc)(tmp.c,tmp.c,32,key,ivec,0);
- memcpy(out,tmp.c,16+residue);
+ (*cbc) (tmp.c, tmp.c, 32, key, ivec, 0);
+ memcpy(out, tmp.c, 16 + residue);
#endif
- return len+residue;
-}
-
-#if defined(SELFTEST)
-#include <stdio.h>
-#include <openssl/aes.h>
-
-/* test vectors from RFC 3962 */
-static const unsigned char test_key[16] = "chicken teriyaki";
-static const unsigned char test_input[64] =
- "I would like the" " General Gau's C"
- "hicken, please, " "and wonton soup.";
-static const unsigned char test_iv[16] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
-
-static const unsigned char vector_17[17] =
-{0xc6,0x35,0x35,0x68,0xf2,0xbf,0x8c,0xb4, 0xd8,0xa5,0x80,0x36,0x2d,0xa7,0xff,0x7f,
- 0x97};
-static const unsigned char vector_31[31] =
-{0xfc,0x00,0x78,0x3e,0x0e,0xfd,0xb2,0xc1, 0xd4,0x45,0xd4,0xc8,0xef,0xf7,0xed,0x22,
- 0x97,0x68,0x72,0x68,0xd6,0xec,0xcc,0xc0, 0xc0,0x7b,0x25,0xe2,0x5e,0xcf,0xe5};
-static const unsigned char vector_32[32] =
-{0x39,0x31,0x25,0x23,0xa7,0x86,0x62,0xd5, 0xbe,0x7f,0xcb,0xcc,0x98,0xeb,0xf5,0xa8,
- 0x97,0x68,0x72,0x68,0xd6,0xec,0xcc,0xc0, 0xc0,0x7b,0x25,0xe2,0x5e,0xcf,0xe5,0x84};
-static const unsigned char vector_47[47] =
-{0x97,0x68,0x72,0x68,0xd6,0xec,0xcc,0xc0, 0xc0,0x7b,0x25,0xe2,0x5e,0xcf,0xe5,0x84,
- 0xb3,0xff,0xfd,0x94,0x0c,0x16,0xa1,0x8c, 0x1b,0x55,0x49,0xd2,0xf8,0x38,0x02,0x9e,
- 0x39,0x31,0x25,0x23,0xa7,0x86,0x62,0xd5, 0xbe,0x7f,0xcb,0xcc,0x98,0xeb,0xf5};
-static const unsigned char vector_48[48] =
-{0x97,0x68,0x72,0x68,0xd6,0xec,0xcc,0xc0, 0xc0,0x7b,0x25,0xe2,0x5e,0xcf,0xe5,0x84,
- 0x9d,0xad,0x8b,0xbb,0x96,0xc4,0xcd,0xc0, 0x3b,0xc1,0x03,0xe1,0xa1,0x94,0xbb,0xd8,
- 0x39,0x31,0x25,0x23,0xa7,0x86,0x62,0xd5, 0xbe,0x7f,0xcb,0xcc,0x98,0xeb,0xf5,0xa8};
-static const unsigned char vector_64[64] =
-{0x97,0x68,0x72,0x68,0xd6,0xec,0xcc,0xc0, 0xc0,0x7b,0x25,0xe2,0x5e,0xcf,0xe5,0x84,
- 0x39,0x31,0x25,0x23,0xa7,0x86,0x62,0xd5, 0xbe,0x7f,0xcb,0xcc,0x98,0xeb,0xf5,0xa8,
- 0x48,0x07,0xef,0xe8,0x36,0xee,0x89,0xa5, 0x26,0x73,0x0d,0xbc,0x2f,0x7b,0xc8,0x40,
- 0x9d,0xad,0x8b,0xbb,0x96,0xc4,0xcd,0xc0, 0x3b,0xc1,0x03,0xe1,0xa1,0x94,0xbb,0xd8};
-
-static AES_KEY encks, decks;
-
-void test_vector(const unsigned char *vector,size_t len)
-{ unsigned char cleartext[64];
- unsigned char iv[sizeof(test_iv)];
- unsigned char ciphertext[64];
- size_t tail;
-
- printf("vector_%d\n",len); fflush(stdout);
-
- if ((tail=len%16) == 0) tail = 16;
- tail += 16;
-
- /* test block-based encryption */
- memcpy(iv,test_iv,sizeof(test_iv));
- CRYPTO_cts128_encrypt_block(test_input,ciphertext,len,&encks,iv,(block128_f)AES_encrypt);
- if (memcmp(ciphertext,vector,len))
- fprintf(stderr,"output_%d mismatch\n",len), exit(1);
- if (memcmp(iv,vector+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_cts128_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,vector+len-tail,sizeof(iv)))
- 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);
+ return 16 + len + residue;
}
-main()
+size_t CRYPTO_nistcts128_decrypt(const unsigned char *in, unsigned char *out,
+ size_t len, const void *key,
+ unsigned char ivec[16], cbc128_f cbc)
{
- 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));
- exit(0);
-}
+ size_t residue;
+ union {
+ size_t align;
+ unsigned char c[32];
+ } tmp;
+
+ if (len < 16)
+ return 0;
+
+ residue = len % 16;
+
+ if (residue == 0) {
+ (*cbc) (in, out, len, key, ivec, 0);
+ return len;
+ }
+
+ len -= 16 + residue;
+
+ if (len) {
+ (*cbc) (in, out, len, key, ivec, 0);
+ in += len;
+ out += len;
+ }
+
+ memset(tmp.c, 0, sizeof(tmp));
+ /*
+ * this places in[16] at &tmp.c[16] and decrypted block at &tmp.c[0]
+ */
+ (*cbc) (in + residue, tmp.c, 16, key, tmp.c + 16, 0);
+
+ memcpy(tmp.c, in, residue);
+#if defined(CBC_HANDLES_TRUNCATED_IO)
+ (*cbc) (tmp.c, out, 16 + residue, key, ivec, 0);
+#else
+ (*cbc) (tmp.c, tmp.c, 32, key, ivec, 0);
+ memcpy(out, tmp.c, 16 + residue);
#endif
+ return 16 + len + residue;
+}
projects / openssl.git / blobdiff