134 lines
3.3 KiB
C
134 lines
3.3 KiB
C
#include "mupdf/fitz.h"
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#include "mupdf/pdf.h"
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#include "../fitz/fitz-imp.h"
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#include <string.h>
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void pdf_write_digest(fz_context *ctx, fz_output *out, pdf_obj *byte_range, int hexdigest_offset, int hexdigest_length, pdf_pkcs7_signer *signer)
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{
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fz_stream *stm = NULL;
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fz_stream *in = NULL;
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fz_range *brange = NULL;
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int brange_len = pdf_array_len(ctx, byte_range)/2;
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unsigned char *digest = NULL;
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int digest_len;
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fz_var(stm);
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fz_var(in);
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fz_var(brange);
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fz_var(digest);
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if (hexdigest_length < 4)
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fz_throw(ctx, FZ_ERROR_GENERIC, "Bad parameters to pdf_write_digest");
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fz_try(ctx)
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{
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int i, res;
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brange = fz_calloc(ctx, brange_len, sizeof(*brange));
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for (i = 0; i < brange_len; i++)
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{
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brange[i].offset = pdf_array_get_int(ctx, byte_range, 2*i);
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brange[i].length = pdf_array_get_int(ctx, byte_range, 2*i+1);
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}
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stm = fz_stream_from_output(ctx, out);
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in = fz_open_range_filter(ctx, stm, brange, brange_len);
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digest_len = (hexdigest_length - 2) / 2;
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digest = fz_malloc(ctx, digest_len);
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res = signer->create_digest(signer, in, digest, &digest_len);
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if (!res)
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fz_throw(ctx, FZ_ERROR_GENERIC, "pdf_pkcs7_create_digest failed");
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fz_drop_stream(ctx, in);
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in = NULL;
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fz_drop_stream(ctx, stm);
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stm = NULL;
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fz_seek_output(ctx, out, hexdigest_offset+1, SEEK_SET);
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for (i = 0; i < digest_len; i++)
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fz_write_printf(ctx, out, "%02x", digest[i]);
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}
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fz_always(ctx)
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{
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fz_free(ctx, digest);
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fz_free(ctx, brange);
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fz_drop_stream(ctx, stm);
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fz_drop_stream(ctx, in);
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}
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fz_catch(ctx)
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{
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fz_rethrow(ctx);
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}
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}
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void pdf_sign_signature(fz_context *ctx, pdf_document *doc, pdf_widget *widget, pdf_pkcs7_signer *signer)
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{
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pdf_pkcs7_designated_name *dn = NULL;
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fz_buffer *fzbuf = NULL;
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fz_try(ctx)
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{
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const char *dn_str;
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pdf_obj *wobj = ((pdf_annot *)widget)->obj;
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fz_rect rect;
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rect = pdf_dict_get_rect(ctx, wobj, PDF_NAME(Rect));
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/* Create an appearance stream only if the signature is intended to be visible */
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if (!fz_is_empty_rect(rect))
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{
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dn = signer->designated_name(signer);
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fzbuf = fz_new_buffer(ctx, 256);
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if (!dn->cn)
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fz_throw(ctx, FZ_ERROR_GENERIC, "Certificate has no common name");
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fz_append_printf(ctx, fzbuf, "cn=%s", dn->cn);
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if (dn->o)
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fz_append_printf(ctx, fzbuf, ", o=%s", dn->o);
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if (dn->ou)
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fz_append_printf(ctx, fzbuf, ", ou=%s", dn->ou);
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if (dn->email)
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fz_append_printf(ctx, fzbuf, ", email=%s", dn->email);
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if (dn->c)
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fz_append_printf(ctx, fzbuf, ", c=%s", dn->c);
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dn_str = fz_string_from_buffer(ctx, fzbuf);
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pdf_update_signature_appearance(ctx, (pdf_annot *)widget, dn->cn, dn_str, NULL);
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}
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pdf_signature_set_value(ctx, doc, wobj, signer);
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}
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fz_always(ctx)
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{
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signer->drop_designated_name(signer, dn);
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fz_drop_buffer(ctx, fzbuf);
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}
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fz_catch(ctx)
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{
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fz_rethrow(ctx);
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}
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}
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void pdf_clear_signature(fz_context *ctx, pdf_document *doc, pdf_widget *widget)
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{
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int flags;
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flags = pdf_dict_get_int(ctx, ((pdf_annot *) widget)->obj, PDF_NAME(F));
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flags &= ~PDF_ANNOT_IS_LOCKED;
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if (flags)
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pdf_dict_put_int(ctx, ((pdf_annot *) widget)->obj, PDF_NAME(F), flags);
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else
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pdf_dict_del(ctx, ((pdf_annot *) widget)->obj, PDF_NAME(F));
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pdf_dict_del(ctx, ((pdf_annot *) widget)->obj, PDF_NAME(V));
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pdf_update_signature_appearance(ctx, widget, NULL, NULL, NULL);
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}
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