AESCTR_IVSIZE
i >= AESCTR_NONCESIZE + AESCTR_IVSIZE; i--)
memcpy(ivout, iv, AESCTR_IVSIZE);
memcpy(ctx->ac_block + AESCTR_NONCESIZE, iv, AESCTR_IVSIZE);
memset(ctx->ac_block + AESCTR_NONCESIZE + AESCTR_IVSIZE, 0, 4);
memcpy(ivout, iv, AESCTR_IVSIZE);
memcpy(ctx->ac_block + AESCTR_NONCESIZE, iv, AESCTR_IVSIZE);
memset(ctx->ac_block + AESCTR_NONCESIZE + AESCTR_IVSIZE, 0, 4);
memcpy(ivout, iv, AESCTR_IVSIZE);