diff options
Diffstat (limited to 'crypto/modes/ofb128.c')
-rw-r--r-- | crypto/modes/ofb128.c | 107 |
1 files changed, 54 insertions, 53 deletions
diff --git a/crypto/modes/ofb128.c b/crypto/modes/ofb128.c index 2b06117649..4dbaccd7a6 100644 --- a/crypto/modes/ofb128.c +++ b/crypto/modes/ofb128.c @@ -6,7 +6,7 @@ * are met: * * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. + * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in @@ -59,65 +59,66 @@ #endif #include <assert.h> -/* The input and output encrypted as though 128bit ofb mode is being - * used. The extra state information to record how much of the - * 128bit block we have used is contained in *num; +/* + * The input and output encrypted as though 128bit ofb mode is being used. + * The extra state information to record how much of the 128bit block we have + * used is contained in *num; */ void CRYPTO_ofb128_encrypt(const unsigned char *in, unsigned char *out, - size_t len, const void *key, - unsigned char ivec[16], int *num, - block128_f block) + size_t len, const void *key, + unsigned char ivec[16], int *num, block128_f block) { - unsigned int n; - size_t l=0; + unsigned int n; + size_t l = 0; - assert(in && out && key && ivec && num); + assert(in && out && key && ivec && num); - n = *num; + n = *num; #if !defined(OPENSSL_SMALL_FOOTPRINT) - if (16%sizeof(size_t) == 0) { /* always true actually */ - do { - while (n && len) { - *(out++) = *(in++) ^ ivec[n]; - --len; - n = (n+1) % 16; - } -#if defined(STRICT_ALIGNMENT) - if (((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0) - break; -#endif - while (len>=16) { - (*block)(ivec, ivec, key); - for (; n<16; n+=sizeof(size_t)) - *(size_t*)(out+n) = - *(size_t*)(in+n) ^ *(size_t*)(ivec+n); - len -= 16; - out += 16; - in += 16; - n = 0; - } - if (len) { - (*block)(ivec, ivec, key); - while (len--) { - out[n] = in[n] ^ ivec[n]; - ++n; - } - } - *num = n; - return; - } while(0); - } - /* the rest would be commonly eliminated by x86* compiler */ + if (16 % sizeof(size_t) == 0) { /* always true actually */ + do { + while (n && len) { + *(out++) = *(in++) ^ ivec[n]; + --len; + n = (n + 1) % 16; + } +# if defined(STRICT_ALIGNMENT) + if (((size_t)in | (size_t)out | (size_t)ivec) % sizeof(size_t) != + 0) + break; +# endif + while (len >= 16) { + (*block) (ivec, ivec, key); + for (; n < 16; n += sizeof(size_t)) + *(size_t *)(out + n) = + *(size_t *)(in + n) ^ *(size_t *)(ivec + n); + len -= 16; + out += 16; + in += 16; + n = 0; + } + if (len) { + (*block) (ivec, ivec, key); + while (len--) { + out[n] = in[n] ^ ivec[n]; + ++n; + } + } + *num = n; + return; + } while (0); + } + /* the rest would be commonly eliminated by x86* compiler */ #endif - while (l<len) { - if (n==0) { - (*block)(ivec, ivec, key); - } - out[l] = in[l] ^ ivec[n]; - ++l; - n = (n+1) % 16; - } + while (l < len) { + if (n == 0) { + (*block) (ivec, ivec, key); + } + out[l] = in[l] ^ ivec[n]; + ++l; + n = (n + 1) % 16; + } - *num=n; + *num = n; } |