content: package im.actor.crypto.primitives.curve25519;
  
  public class fe_sq2 {
  
  //CONVERT #include "fe.h"
  //CONVERT #include "long.h"
  
  /*
  h = 2 * f * f
  Can overlap h with f.
  
  Preconditions:
     |f| bounded by 1.65*2^26,1.65*2^25,1.65*2^26,1.65*2^25,etc.
  
  Postconditions:
     |h| bounded by 1.01*2^25,1.01*2^24,1.01*2^25,1.01*2^24,etc.
  */
  
  /*
  See fe_mul.c for discussion of implementation strategy.
  */
  
  public static void fe_sq2(int[] h,int[] f)
  {
    int f0 = f[0];
    int f1 = f[1];
    int f2 = f[2];
    int f3 = f[3];
    int f4 = f[4];
    int f5 = f[5];
    int f6 = f[6];
    int f7 = f[7];
    int f8 = f[8];
    int f9 = f[9];
    int f0_2 = 2 * f0;
    int f1_2 = 2 * f1;
    int f2_2 = 2 * f2;
    int f3_2 = 2 * f3;
    int f4_2 = 2 * f4;
    int f5_2 = 2 * f5;
    int f6_2 = 2 * f6;
    int f7_2 = 2 * f7;
    int f5_38 = 38 * f5; /* 1.959375*2^30 */
    int f6_19 = 19 * f6; /* 1.959375*2^30 */
    int f7_38 = 38 * f7; /* 1.959375*2^30 */
    int f8_19 = 19 * f8; /* 1.959375*2^30 */
    int f9_38 = 38 * f9; /* 1.959375*2^30 */
    long f0f0    = f0   * (long) f0;
    long f0f1_2  = f0_2 * (long) f1;
    long f0f2_2  = f0_2 * (long) f2;
    long f0f3_2  = f0_2 * (long) f3;
    long f0f4_2  = f0_2 * (long) f4;
    long f0f5_2  = f0_2 * (long) f5;
    long f0f6_2  = f0_2 * (long) f6;
    long f0f7_2  = f0_2 * (long) f7;
    long f0f8_2  = f0_2 * (long) f8;
    long f0f9_2  = f0_2 * (long) f9;
    long f1f1_2  = f1_2 * (long) f1;
    long f1f2_2  = f1_2 * (long) f2;
    long f1f3_4  = f1_2 * (long) f3_2;
    long f1f4_2  = f1_2 * (long) f4;
    long f1f5_4  = f1_2 * (long) f5_2;
    long f1f6_2  = f1_2 * (long) f6;
    long f1f7_4  = f1_2 * (long) f7_2;
    long f1f8_2  = f1_2 * (long) f8;
    long f1f9_76 = f1_2 * (long) f9_38;
    long f2f2    = f2   * (long) f2;
    long f2f3_2  = f2_2 * (long) f3;
    long f2f4_2  = f2_2 * (long) f4;
    long f2f5_2  = f2_2 * (long) f5;
    long f2f6_2  = f2_2 * (long) f6;
    long f2f7_2  = f2_2 * (long) f7;
    long f2f8_38 = f2_2 * (long) f8_19;
    long f2f9_38 = f2   * (long) f9_38;
    long f3f3_2  = f3_2 * (long) f3;
    long f3f4_2  = f3_2 * (long) f4;
    long f3f5_4  = f3_2 * (long) f5_2;
    long f3f6_2  = f3_2 * (long) f6;
    long f3f7_76 = f3_2 * (long) f7_38;
    long f3f8_38 = f3_2 * (long) f8_19;
    long f3f9_76 = f3_2 * (long) f9_38;
    long f4f4    = f4   * (long) f4;
    long f4f5_2  = f4_2 * (long) f5;
    long f4f6_38 = f4_2 * (long) f6_19;
    long f4f7_38 = f4   * (long) f7_38;
    long f4f8_38 = f4_2 * (long) f8_19;
    long f4f9_38 = f4   * (long) f9_38;
    long f5f5_38 = f5   * (long) f5_38;
    long f5f6_38 = f5_2 * (long) f6_19;
    long f5f7_76 = f5_2 * (long) f7_38;
    long f5f8_38 = f5_2 * (long) f8_19;
    long f5f9_76 = f5_2 * (long) f9_38;
    long f6f6_19 = f6   * (long) f6_19;
    long f6f7_38 = f6   * (long) f7_38;
    long f6f8_38 = f6_2 * (long) f8_19;
    long f6f9_38 = f6   * (long) f9_38;
    long f7f7_38 = f7   * (long) f7_38;
    long f7f8_38 = f7_2 * (long) f8_19;
    long f7f9_76 = f7_2 * (long) f9_38;
    long f8f8_19 = f8   * (long) f8_19;
    long f8f9_38 = f8   * (long) f9_38;
    long f9f9_38 = f9   * (long) f9_38;
    long h0 = f0f0  +f1f9_76+f2f8_38+f3f7_76+f4f6_38+f5f5_38;
    long h1 = f0f1_2+f2f9_38+f3f8_38+f4f7_38+f5f6_38;
    long h2 = f0f2_2+f1f1_2 +f3f9_76+f4f8_38+f5f7_76+f6f6_19;
    long h3 = f0f3_2+f1f2_2 +f4f9_38+f5f8_38+f6f7_38;
    long h4 = f0f4_2+f1f3_4 +f2f2   +f5f9_76+f6f8_38+f7f7_38;
    long h5 = f0f5_2+f1f4_2 +f2f3_2 +f6f9_38+f7f8_38;
    long h6 = f0f6_2+f1f5_4 +f2f4_2 +f3f3_2 +f7f9_76+f8f8_19;
    long h7 = f0f7_2+f1f6_2 +f2f5_2 +f3f4_2 +f8f9_38;
    long h8 = f0f8_2+f1f7_4 +f2f6_2 +f3f5_4 +f4f4   +f9f9_38;
    long h9 = f0f9_2+f1f8_2 +f2f7_2 +f3f6_2 +f4f5_2;
    long carry0;
    long carry1;
    long carry2;
    long carry3;
    long carry4;
    long carry5;
    long carry6;
    long carry7;
    long carry8;
    long carry9;
  
    h0 += h0;
    h1 += h1;
    h2 += h2;
    h3 += h3;
    h4 += h4;
    h5 += h5;
    h6 += h6;
    h7 += h7;
    h8 += h8;
    h9 += h9;
  
    carry0 = (h0 + (long) (1<<25)) >> 26; h1 += carry0; h0 -= carry0 << 26;
    carry4 = (h4 + (long) (1<<25)) >> 26; h5 += carry4; h4 -= carry4 << 26;
  
    carry1 = (h1 + (long) (1<<24)) >> 25; h2 += carry1; h1 -= carry1 << 25;
    carry5 = (h5 + (long) (1<<24)) >> 25; h6 += carry5; h5 -= carry5 << 25;
  
    carry2 = (h2 + (long) (1<<25)) >> 26; h3 += carry2; h2 -= carry2 << 26;
    carry6 = (h6 + (long) (1<<25)) >> 26; h7 += carry6; h6 -= carry6 << 26;
  
    carry3 = (h3 + (long) (1<<24)) >> 25; h4 += carry3; h3 -= carry3 << 25;
    carry7 = (h7 + (long) (1<<24)) >> 25; h8 += carry7; h7 -= carry7 << 25;
  
    carry4 = (h4 + (long) (1<<25)) >> 26; h5 += carry4; h4 -= carry4 << 26;
    carry8 = (h8 + (long) (1<<25)) >> 26; h9 += carry8; h8 -= carry8 << 26;
  
    carry9 = (h9 + (long) (1<<24)) >> 25; h0 += carry9 * 19; h9 -= carry9 << 25;
  
    carry0 = (h0 + (long) (1<<25)) >> 26; h1 += carry0; h0 -= carry0 << 26;
  
    h[0] = (int)h0;
    h[1] = (int)h1;
    h[2] = (int)h2;
    h[3] = (int)h3;
    h[4] = (int)h4;
    h[5] = (int)h5;
    h[6] = (int)h6;
    h[7] = (int)h7;
    h[8] = (int)h8;
    h[9] = (int)h9;
  }
  
  
  }
  