The length must be a multiple of BlockSize (16). // //go:noescape func cryptBlocks(c code, key, dst, src *byte, length int) var supportsAES = cpu.S390XHasAES && cpu.S390XHasAESCBC func init() { // CP Assist for Cryptographic Functions (CPACF) // https://www.ibm.com/docs/en/zos/3.1.0?topic=icsf-cp-assist-cryptographic-functions-cpacf impl.Register("aes", "CPACF", &supportsAES) } func checkGenericIsExpect() { if supportsAES { panic("crypto/aes: internal error: using generic implementation despite hardware...