# MIT Kerberos Documentation

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# krb5_k_decrypt_iov - Decrypt data in place supporting AEAD (operates on opaque key).

krb5_error_code krb5_k_decrypt_iov(krb5_context context, krb5_key key, krb5_keyusage usage, const krb5_data *cipher_state, krb5_crypto_iov *data, size_t num_data)

param:

  [in] context - Library context

  [in] key - Encryption key

  [in] usage - Key usage (see KRB5_KEYUSAGE macros)

  [in] cipher_state - Cipher state; specify NULL if not needed

  [inout] data - IOV array. Modified in-place.

  [in] num_data - Size of data

retval:

  - 0 Success; otherwise - Kerberos error codes

This function decrypts the data block data and stores the output in-place. The actual decryption key will be derived from key and usage if key derivation is specified for the encryption type. If non-null, cipher_state specifies the beginning state for the decryption operation, and is updated with the state to be passed as input to the next operation. The caller must allocate the right number of krb5_crypto_iov structures before calling into this API.

See also

krb5_k_encrypt_iov()

Note

On return from a krb5_c_decrypt_iov() call, the data->length in the iov structure are adjusted to reflect actual lengths of the ciphertext used. For example, if the padding length is too large, the length will be reduced. Lengths are never increased.