Qt-AES/aesni/aesni-enc-ecb.c

#include <wmmintrin.h>

#ifdef __cplusplus
extern "C" {
#endif

/* Note – the length of the output buffer is assumed to be a multiple of 16 bytes */
void AES_ECB_encrypt(const unsigned char *in,  //pointer to the PLAINTEXT
                     unsigned char *out,       //pointer to the CIPHERTEXT buffer
                     unsigned long length,     //text length in bytes
                     const char *key,          //pointer to the expanded key schedule
                     int number_of_rounds)     //number of AES rounds 10,12 or 14
{
    __m128i tmp;
    unsigned long i;
    int j;
    if(length%16)
        length = length/16+1;
    else
        length = length/16;
    for(i = 0; i < length; i++) {
        tmp = _mm_loadu_si128 (&((__m128i*)in)[i]);
        tmp = _mm_xor_si128 (tmp,((__m128i*)key)[0]);
        for(j=1; j <number_of_rounds; j++) {
            tmp = _mm_aesenc_si128 (tmp, ((__m128i*)key)[j]);
        }
        tmp = _mm_aesenclast_si128 (tmp,((__m128i*)key)[j]);
        _mm_storeu_si128 (&((__m128i*)out)[i],tmp);
        }
}

void AES_ECB_decrypt(const unsigned char *in,  //pointer to the CIPHERTEXT
                     unsigned char *out,       //pointer to the DECRYPTED TEXT buffer
                     unsigned long length,     //text length in bytes
                     const char *key,          //pointer to the expanded key schedule
                     int number_of_rounds)     //number of AES rounds 10,12 or 14
{
    __m128i tmp;
    unsigned long i;
    int j;
    if(length%16)
        length = length/16+1;
    else
        length = length/16;
    for(i = 0; i < length; i++) {
        tmp = _mm_loadu_si128 (&((__m128i*)in)[i]);
        tmp = _mm_xor_si128 (tmp,((__m128i*)key)[0]);
        for(j = 1; j < number_of_rounds; j++) {
            tmp = _mm_aesdec_si128 (tmp,((__m128i*)key)[j]);
        }
        tmp = _mm_aesdeclast_si128 (tmp,((__m128i*)key)[j]);
        _mm_storeu_si128 (&((__m128i*)out)[i],tmp);
    }
}

#ifdef __cplusplus
}
#endif