CSNBSYD and CSNBSYD1 provide identical functions. When choosing which service to use, consider this:

• CSNBSYD requires the ciphertext and plaintext to reside in the caller’s primary address space. Also, a program using CSNBSYD adheres to the IBM Common Cryptographic Architecture: Cryptographic Application Programming Interface.

  The callable service name for AMODE(64) invocation is CSNESYD.

• CSNBSYD1 allows the ciphertext and plaintext to reside either in the caller’s primary address space or in a data space. This can allow you to decipher more data with one call. However, a program using CSNBSYD1 does not adhere to the IBM Common Cryptographic Architecture: Cryptographic Application Programming Interface, and may need to be modified prior to it running with other cryptographic products that follow this programming interface.

  For CSNBSYD1, cipher_text_id and clear_text_id are access list entry token (ALET) parameters of the data spaces containing the ciphertext and plaintext.

  The callable service name for AMODE(64) invocation is CSNESYD1.