| File: | out/../deps/openssl/openssl/crypto/des/cfb64enc.c |
| Warning: | line 77, column 31 Although the value stored to 'c' is used in the enclosing expression, the value is never actually read from 'c' |
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| 1 | /* |
| 2 | * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved. |
| 3 | * |
| 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
| 5 | * this file except in compliance with the License. You can obtain a copy |
| 6 | * in the file LICENSE in the source distribution or at |
| 7 | * https://www.openssl.org/source/license.html |
| 8 | */ |
| 9 | |
| 10 | /* |
| 11 | * DES low level APIs are deprecated for public use, but still ok for internal |
| 12 | * use. |
| 13 | */ |
| 14 | #include "internal/deprecated.h" |
| 15 | |
| 16 | #include "des_local.h" |
| 17 | |
| 18 | /* |
| 19 | * The input and output encrypted as though 64bit cfb mode is being used. |
| 20 | * The extra state information to record how much of the 64bit block we have |
| 21 | * used is contained in *num; |
| 22 | */ |
| 23 | |
| 24 | void DES_cfb64_encrypt(const unsigned char *in, unsigned char *out, |
| 25 | long length, DES_key_schedule *schedule, |
| 26 | DES_cblock *ivec, int *num, int enc) |
| 27 | { |
| 28 | register DES_LONG v0, v1; |
| 29 | register long l = length; |
| 30 | register int n = *num; |
| 31 | DES_LONG ti[2]; |
| 32 | unsigned char *iv, c, cc; |
| 33 | |
| 34 | iv = &(*ivec)[0]; |
| 35 | if (enc) { |
| 36 | while (l--) { |
| 37 | if (n == 0) { |
| 38 | c2l(iv, v0)(v0 =((DES_LONG)(*((iv)++))) , v0|=((DES_LONG)(*((iv)++)))<< 8L, v0|=((DES_LONG)(*((iv)++)))<<16L, v0|=((DES_LONG)( *((iv)++)))<<24L); |
| 39 | ti[0] = v0; |
| 40 | c2l(iv, v1)(v1 =((DES_LONG)(*((iv)++))) , v1|=((DES_LONG)(*((iv)++)))<< 8L, v1|=((DES_LONG)(*((iv)++)))<<16L, v1|=((DES_LONG)( *((iv)++)))<<24L); |
| 41 | ti[1] = v1; |
| 42 | DES_encrypt1(ti, schedule, DES_ENCRYPT1); |
| 43 | iv = &(*ivec)[0]; |
| 44 | v0 = ti[0]; |
| 45 | l2c(v0, iv)(*((iv)++)=(unsigned char)(((v0) )&0xff), *((iv)++)=(unsigned char)(((v0)>> 8L)&0xff), *((iv)++)=(unsigned char) (((v0)>>16L)&0xff), *((iv)++)=(unsigned char)(((v0) >>24L)&0xff)); |
| 46 | v0 = ti[1]; |
| 47 | l2c(v0, iv)(*((iv)++)=(unsigned char)(((v0) )&0xff), *((iv)++)=(unsigned char)(((v0)>> 8L)&0xff), *((iv)++)=(unsigned char) (((v0)>>16L)&0xff), *((iv)++)=(unsigned char)(((v0) >>24L)&0xff)); |
| 48 | iv = &(*ivec)[0]; |
| 49 | } |
| 50 | c = *(in++) ^ iv[n]; |
| 51 | *(out++) = c; |
| 52 | iv[n] = c; |
| 53 | n = (n + 1) & 0x07; |
| 54 | } |
| 55 | } else { |
| 56 | while (l--) { |
| 57 | if (n == 0) { |
| 58 | c2l(iv, v0)(v0 =((DES_LONG)(*((iv)++))) , v0|=((DES_LONG)(*((iv)++)))<< 8L, v0|=((DES_LONG)(*((iv)++)))<<16L, v0|=((DES_LONG)( *((iv)++)))<<24L); |
| 59 | ti[0] = v0; |
| 60 | c2l(iv, v1)(v1 =((DES_LONG)(*((iv)++))) , v1|=((DES_LONG)(*((iv)++)))<< 8L, v1|=((DES_LONG)(*((iv)++)))<<16L, v1|=((DES_LONG)( *((iv)++)))<<24L); |
| 61 | ti[1] = v1; |
| 62 | DES_encrypt1(ti, schedule, DES_ENCRYPT1); |
| 63 | iv = &(*ivec)[0]; |
| 64 | v0 = ti[0]; |
| 65 | l2c(v0, iv)(*((iv)++)=(unsigned char)(((v0) )&0xff), *((iv)++)=(unsigned char)(((v0)>> 8L)&0xff), *((iv)++)=(unsigned char) (((v0)>>16L)&0xff), *((iv)++)=(unsigned char)(((v0) >>24L)&0xff)); |
| 66 | v0 = ti[1]; |
| 67 | l2c(v0, iv)(*((iv)++)=(unsigned char)(((v0) )&0xff), *((iv)++)=(unsigned char)(((v0)>> 8L)&0xff), *((iv)++)=(unsigned char) (((v0)>>16L)&0xff), *((iv)++)=(unsigned char)(((v0) >>24L)&0xff)); |
| 68 | iv = &(*ivec)[0]; |
| 69 | } |
| 70 | cc = *(in++); |
| 71 | c = iv[n]; |
| 72 | iv[n] = cc; |
| 73 | *(out++) = c ^ cc; |
| 74 | n = (n + 1) & 0x07; |
| 75 | } |
| 76 | } |
| 77 | v0 = v1 = ti[0] = ti[1] = c = cc = 0; |
Although the value stored to 'c' is used in the enclosing expression, the value is never actually read from 'c' | |
| 78 | *num = n; |
| 79 | } |