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Side by Side Diff: openssl/crypto/aes/aes_ctr.c

Issue 9254031: Upgrade chrome's OpenSSL to same version Android ships with. (Closed) Base URL: http://src.chromium.org/svn/trunk/deps/third_party/openssl/
Patch Set: '' Created 8 years, 11 months ago
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1 /* crypto/aes/aes_ctr.c -*- mode:C; c-file-style: "eay" -*- */ 1 /* crypto/aes/aes_ctr.c -*- mode:C; c-file-style: "eay" -*- */
2 /* ==================================================================== 2 /* ====================================================================
3 * Copyright (c) 1998-2002 The OpenSSL Project. All rights reserved. 3 * Copyright (c) 1998-2002 The OpenSSL Project. All rights reserved.
4 * 4 *
5 * Redistribution and use in source and binary forms, with or without 5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions 6 * modification, are permitted provided that the following conditions
7 * are met: 7 * are met:
8 * 8 *
9 * 1. Redistributions of source code must retain the above copyright 9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer. 10 * notice, this list of conditions and the following disclaimer.
(...skipping 31 matching lines...) Expand 10 before | Expand all | Expand 10 after
42 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 42 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
43 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 43 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
44 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 44 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
45 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 45 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
46 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 46 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
47 * OF THE POSSIBILITY OF SUCH DAMAGE. 47 * OF THE POSSIBILITY OF SUCH DAMAGE.
48 * ==================================================================== 48 * ====================================================================
49 * 49 *
50 */ 50 */
51 51
52 #ifndef AES_DEBUG 52 #include <openssl/aes.h>
53 # ifndef NDEBUG 53 #include <openssl/modes.h>
54 # define NDEBUG
55 # endif
56 #endif
57 #include <assert.h>
58 54
59 #include <openssl/aes.h> 55 void AES_ctr128_encrypt(const unsigned char *in, unsigned char *out,
60 #include "aes_locl.h" 56 » » » size_t length, const AES_KEY *key,
61 57 » » » unsigned char ivec[AES_BLOCK_SIZE],
62 /* NOTE: the IV/counter CTR mode is big-endian. The rest of the AES code 58 » » » unsigned char ecount_buf[AES_BLOCK_SIZE],
63 * is endian-neutral. */ 59 » » » unsigned int *num) {
64 60 » CRYPTO_ctr128_encrypt(in,out,length,key,ivec,ecount_buf,num,(block128_f) AES_encrypt);
65 /* increment counter (128-bit int) by 1 */
66 static void AES_ctr128_inc(unsigned char *counter) {
67 » unsigned long c;
68
69 » /* Grab bottom dword of counter and increment */
70 » c = GETU32(counter + 12);
71 » c++;» c &= 0xFFFFFFFF;
72 » PUTU32(counter + 12, c);
73
74 » /* if no overflow, we're done */
75 » if (c)
76 » » return;
77
78 » /* Grab 1st dword of counter and increment */
79 » c = GETU32(counter + 8);
80 » c++;» c &= 0xFFFFFFFF;
81 » PUTU32(counter + 8, c);
82
83 » /* if no overflow, we're done */
84 » if (c)
85 » » return;
86
87 » /* Grab 2nd dword of counter and increment */
88 » c = GETU32(counter + 4);
89 » c++;» c &= 0xFFFFFFFF;
90 » PUTU32(counter + 4, c);
91
92 » /* if no overflow, we're done */
93 » if (c)
94 » » return;
95
96 » /* Grab top dword of counter and increment */
97 » c = GETU32(counter + 0);
98 » c++;» c &= 0xFFFFFFFF;
99 » PUTU32(counter + 0, c);
100 } 61 }
101
102 /* The input encrypted as though 128bit counter mode is being
103 * used. The extra state information to record how much of the
104 * 128bit block we have used is contained in *num, and the
105 * encrypted counter is kept in ecount_buf. Both *num and
106 * ecount_buf must be initialised with zeros before the first
107 * call to AES_ctr128_encrypt().
108 *
109 * This algorithm assumes that the counter is in the x lower bits
110 * of the IV (ivec), and that the application has full control over
111 * overflow and the rest of the IV. This implementation takes NO
112 * responsability for checking that the counter doesn't overflow
113 * into the rest of the IV when incremented.
114 */
115 void AES_ctr128_encrypt(const unsigned char *in, unsigned char *out,
116 const unsigned long length, const AES_KEY *key,
117 unsigned char ivec[AES_BLOCK_SIZE],
118 unsigned char ecount_buf[AES_BLOCK_SIZE],
119 unsigned int *num) {
120
121 unsigned int n;
122 unsigned long l=length;
123
124 assert(in && out && key && counter && num);
125 assert(*num < AES_BLOCK_SIZE);
126
127 n = *num;
128
129 while (l--) {
130 if (n == 0) {
131 AES_encrypt(ivec, ecount_buf, key);
132 AES_ctr128_inc(ivec);
133 }
134 *(out++) = *(in++) ^ ecount_buf[n];
135 n = (n+1) % AES_BLOCK_SIZE;
136 }
137
138 *num=n;
139 }
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