private static Compare ( byte array1, byte array2 ) : bool | ||
array1 | byte | |
array2 | byte | |
return | bool |
public static bool Verify_v15(RSA rsa, HashAlgorithm hash, byte[] hashValue, byte[] signature, bool tryNonStandardEncoding) { int num = rsa.KeySize >> 3; byte[] s = PKCS1.OS2IP(signature); byte[] x = PKCS1.RSAVP1(rsa, s); byte[] array = PKCS1.I2OSP(x, num); byte[] array2 = PKCS1.Encode_v15(hash, hashValue, num); bool flag = PKCS1.Compare(array2, array); if (flag || !tryNonStandardEncoding) { return(flag); } if (array[0] != 0 || array[1] != 1) { return(false); } int i; for (i = 2; i < array.Length - hashValue.Length - 1; i++) { if (array[i] != 255) { return(false); } } if (array[i++] != 0) { return(false); } byte[] array3 = new byte[hashValue.Length]; Buffer.BlockCopy(array, i, array3, 0, array3.Length); return(PKCS1.Compare(array3, hashValue)); }
public static byte[] Decrypt_OAEP(RSA rsa, HashAlgorithm hash, byte[] C) { int size = rsa.KeySize / 8; int maskLen = hash.HashSize / 8; if (size < 2 * maskLen + 2 || C.Length != size) { throw new CryptographicException("decryption error"); } byte[] c = PKCS1.OS2IP(C); byte[] numArray1 = PKCS1.I2OSP(PKCS1.RSADP(rsa, c), size); byte[] array1 = new byte[maskLen]; Buffer.BlockCopy((Array)numArray1, 1, (Array)array1, 0, array1.Length); byte[] numArray2 = new byte[size - maskLen - 1]; Buffer.BlockCopy((Array)numArray1, numArray1.Length - numArray2.Length, (Array)numArray2, 0, numArray2.Length); byte[] array2_1 = PKCS1.MGF1(hash, numArray2, maskLen); byte[] mgfSeed = PKCS1.xor(array1, array2_1); byte[] array2_2 = PKCS1.MGF1(hash, mgfSeed, size - maskLen - 1); byte[] numArray3 = PKCS1.xor(numArray2, array2_2); byte[] emptyHash = PKCS1.GetEmptyHash(hash); byte[] array2_3 = new byte[emptyHash.Length]; Buffer.BlockCopy((Array)numArray3, 0, (Array)array2_3, 0, array2_3.Length); bool flag = PKCS1.Compare(emptyHash, array2_3); int length = emptyHash.Length; while (numArray3[length] == (byte)0) { ++length; } int count = numArray3.Length - length - 1; byte[] numArray4 = new byte[count]; Buffer.BlockCopy((Array)numArray3, length + 1, (Array)numArray4, 0, count); return(numArray1[0] != (byte)0 || !flag || numArray3[length] != (byte)1 ? (byte[])null : numArray4); }
public static bool Verify_v15( RSA rsa, HashAlgorithm hash, byte[] hashValue, byte[] signature, bool tryNonStandardEncoding) { int num = rsa.KeySize >> 3; byte[] s = PKCS1.OS2IP(signature); byte[] array2 = PKCS1.I2OSP(PKCS1.RSAVP1(rsa, s), num); bool flag = PKCS1.Compare(PKCS1.Encode_v15(hash, hashValue, num), array2); if (flag || !tryNonStandardEncoding) { return(flag); } if (array2[0] != (byte)0 || array2[1] != (byte)1) { return(false); } int index1; for (index1 = 2; index1 < array2.Length - hashValue.Length - 1; ++index1) { if (array2[index1] != byte.MaxValue) { return(false); } } byte[] numArray = array2; int index2 = index1; int srcOffset = index2 + 1; if (numArray[index2] != (byte)0) { return(false); } byte[] array1 = new byte[hashValue.Length]; Buffer.BlockCopy((Array)array2, srcOffset, (Array)array1, 0, array1.Length); return(PKCS1.Compare(array1, hashValue)); }
public static byte[] Decrypt_OAEP(RSA rsa, HashAlgorithm hash, byte[] C) { int num = rsa.KeySize / 8; int num2 = hash.HashSize / 8; if (num < 2 * num2 + 2 || C.Length != num) { throw new CryptographicException("decryption error"); } byte[] c = PKCS1.OS2IP(C); byte[] x = PKCS1.RSADP(rsa, c); byte[] array = PKCS1.I2OSP(x, num); byte[] array2 = new byte[num2]; Buffer.BlockCopy(array, 1, array2, 0, array2.Length); byte[] array3 = new byte[num - num2 - 1]; Buffer.BlockCopy(array, array.Length - array3.Length, array3, 0, array3.Length); byte[] array4 = PKCS1.MGF1(hash, array3, num2); byte[] mgfSeed = PKCS1.xor(array2, array4); byte[] array5 = PKCS1.MGF1(hash, mgfSeed, num - num2 - 1); byte[] array6 = PKCS1.xor(array3, array5); byte[] emptyHash = PKCS1.GetEmptyHash(hash); byte[] array7 = new byte[emptyHash.Length]; Buffer.BlockCopy(array6, 0, array7, 0, array7.Length); bool flag = PKCS1.Compare(emptyHash, array7); int num3 = emptyHash.Length; while (array6[num3] == 0) { num3++; } int num4 = array6.Length - num3 - 1; byte[] array8 = new byte[num4]; Buffer.BlockCopy(array6, num3 + 1, array8, 0, num4); if (array[0] != 0 || !flag || array6[num3] != 1) { return(null); } return(array8); }