Also keep track of the number of padding characters ('=') seen.
(base64_decode_update): New argument dst_length. Return -1 on error.
(base64_decode_status):  Renamed function...
(base64_decode_final): ... to this.

* base64.h (struct base64_decode_ctx): Deleted STATUS attribute.
Added PADDING attribute.

Rev: src/nettle/base64-decode.c:1.4
Rev: src/nettle/base64.h:1.11

the done variable.

Rev: src/nettle/base64-decode.c:1.3

(base64_decode_update): Use base64_decode_single.

Rev: src/nettle/base64-decode.c:1.2
Rev: src/nettle/base64.h:1.10

and streamed operation.

* base64-decode.c: New file.

Rev: src/nettle/base64-decode.c:1.1
Rev: src/nettle/base64-encode.c:1.1