IMSCryptoUtilsSimpleEncryptData

[editdb]

The following string lengths do not encrypt: 15, 31, 47, 63, 79, 95, 111, 127, 143, 159, 175, 191, 207, 223, 239, 255, 271, 287, 303, 319, 335, 351, 367, 383, 399, 415, 431, 447, 463, 479, 495, 511, 527, 543, 559, 575, 591, 607, 623, 639, 655, 671, 687, 703, 719, 735, 751, 767, 783, 799, 815, 831, 847, 863, 879, 895, 911, 927, 943, 959, 975, 991, 1007, 1023, etc etc

The fix is as follows:
// create a buffer
size_t ciphertext_len = ([plaintext length] + kCCBlockSizeAES128 + [iv length]);

// Patch - the output length should be calculated using this iOS function.
// If this line is not included, then 1/16th of strings will fail encryption
// for an incorrect output buffer size kCCBufferTooSmall reported from CCCryptorFinal
ciphertext_len = CCCryptorGetOutputLength(cryptor, ciphertext_len, true);