Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.

BUG:215923


git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdepim@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

1 files changed, 992 insertions, 0 deletions

diff --git a/libkdenetwork/libgpgme-copy/gpgme/verify.c b/libkdenetwork/libgpgme-copy/gpgme/verify.c
new file mode 100644
index 000000000..a9730e59e
--- /dev/null
+++ b/libkdenetwork/libgpgme-copy/gpgme/verify.c
@@ -0,0 +1,992 @@
+/* verify.c - Signature verification.
+   Copyright (C) 2000 Werner Koch (dd9jn)
+   Copyright (C) 2001, 2002, 2003, 2004, 2005 g10 Code GmbH
+
+   This file is part of GPGME.
+ 
+   GPGME is free software; you can redistribute it and/or modify it
+   under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of
+   the License, or (at your option) any later version.
+   
+   GPGME is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+   
+   You should have received a copy of the GNU Lesser General Public
+   License along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+   02111-1307, USA.  */
+
+#if HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <assert.h>
+
+#include "gpgme.h"
+#include "util.h"
+#include "context.h"
+#include "ops.h"
+
+
+typedef struct
+{
+  struct _gpgme_op_verify_result result;
+
+  gpgme_signature_t current_sig;
+  int did_prepare_new_sig;
+  int only_newsig_seen;
+  int plaintext_seen;
+} *op_data_t;
+
+
+static void
+release_op_data (void *hook)
+{
+  op_data_t opd = (op_data_t) hook;
+  gpgme_signature_t sig = opd->result.signatures;
+
+  while (sig)
+    {
+      gpgme_signature_t next = sig->next;
+      gpgme_sig_notation_t notation = sig->notations;
+
+      while (notation)
+	{
+	  gpgme_sig_notation_t next_nota = notation->next;
+
+	  _gpgme_sig_notation_free (notation);
+	  notation = next_nota;
+	}
+
+      if (sig->fpr)
+	free (sig->fpr);
+      if (sig->pka_address)
+	free (sig->pka_address);
+      free (sig);
+      sig = next;
+    }
+
+  if (opd->result.file_name)
+    free (opd->result.file_name);
+}
+
+
+gpgme_verify_result_t
+gpgme_op_verify_result (gpgme_ctx_t ctx)
+{
+  void *hook;
+  op_data_t opd;
+  gpgme_error_t err;
+
+  err = _gpgme_op_data_lookup (ctx, OPDATA_VERIFY, &hook, -1, NULL);
+  opd = hook;
+  if (err || !opd)
+    return NULL;
+
+  return &opd->result;
+}
+
+
+/* Build a summary vector from RESULT. */
+static void
+calc_sig_summary (gpgme_signature_t sig)
+{
+  unsigned long sum = 0;
+  
+  /* Calculate the red/green flag.  */
+  if (sig->validity == GPGME_VALIDITY_FULL
+      || sig->validity == GPGME_VALIDITY_ULTIMATE)
+    {
+      if (gpg_err_code (sig->status) == GPG_ERR_NO_ERROR
+	  || gpg_err_code (sig->status) == GPG_ERR_SIG_EXPIRED
+	  || gpg_err_code (sig->status) == GPG_ERR_KEY_EXPIRED)
+	sum |= GPGME_SIGSUM_GREEN;
+    }
+  else if (sig->validity == GPGME_VALIDITY_NEVER)
+    {
+      if (gpg_err_code (sig->status) == GPG_ERR_NO_ERROR
+	  || gpg_err_code (sig->status) == GPG_ERR_SIG_EXPIRED
+	  || gpg_err_code (sig->status) == GPG_ERR_KEY_EXPIRED)
+	sum |= GPGME_SIGSUM_RED;
+    }
+  else if (gpg_err_code (sig->status) == GPG_ERR_BAD_SIGNATURE)
+    sum |= GPGME_SIGSUM_RED;
+
+
+  /* FIXME: handle the case when key and message are expired. */
+  switch (gpg_err_code (sig->status))
+    {
+    case GPG_ERR_SIG_EXPIRED:
+      sum |= GPGME_SIGSUM_SIG_EXPIRED;
+      break;
+
+    case GPG_ERR_KEY_EXPIRED:
+      sum |= GPGME_SIGSUM_KEY_EXPIRED;
+      break;
+
+    case GPG_ERR_NO_PUBKEY:
+      sum |= GPGME_SIGSUM_KEY_MISSING;
+      break;
+
+    case GPG_ERR_BAD_SIGNATURE:
+    case GPG_ERR_NO_ERROR:
+      break;
+
+    default:
+      sum |= GPGME_SIGSUM_SYS_ERROR;
+      break;
+    }
+  
+  /* Now look at the certain reason codes.  */
+  switch (gpg_err_code (sig->validity_reason))
+    {
+    case GPG_ERR_CRL_TOO_OLD:
+      if (sig->validity == GPGME_VALIDITY_UNKNOWN)
+        sum |= GPGME_SIGSUM_CRL_TOO_OLD;
+      break;
+        
+    case GPG_ERR_CERT_REVOKED:
+      sum |= GPGME_SIGSUM_KEY_REVOKED;
+      break;
+
+    default:
+      break;
+    }
+
+  /* Check other flags. */
+  if (sig->wrong_key_usage)
+    sum |= GPGME_SIGSUM_BAD_POLICY;
+  
+  /* Set the valid flag when the signature is unquestionable
+     valid. */
+  if ((sum & GPGME_SIGSUM_GREEN) && !(sum & ~GPGME_SIGSUM_GREEN))
+    sum |= GPGME_SIGSUM_VALID;
+  
+  sig->summary = sum;
+}
+  
+
+static gpgme_error_t
+prepare_new_sig (op_data_t opd)
+{
+  gpgme_signature_t sig;
+
+  if (opd->only_newsig_seen && opd->current_sig)
+    {
+      /* We have only seen the NEWSIG status and nothing else - we
+         better skip this signature therefore and reuse it for the
+         next possible signature. */
+      sig = opd->current_sig;
+      memset (sig, 0, sizeof *sig);
+      assert (opd->result.signatures == sig);
+    }
+  else
+    {
+      sig = calloc (1, sizeof (*sig));
+      if (!sig)
+        return gpg_error_from_errno (errno);
+      if (!opd->result.signatures)
+        opd->result.signatures = sig;
+      if (opd->current_sig)
+        opd->current_sig->next = sig;
+      opd->current_sig = sig;
+    }
+  opd->did_prepare_new_sig = 1;
+  opd->only_newsig_seen = 0;
+  return 0;
+}
+
+static gpgme_error_t
+parse_new_sig (op_data_t opd, gpgme_status_code_t code, char *args)
+{
+  gpgme_signature_t sig;
+  char *end = strchr (args, ' ');
+  char *tail;
+
+  if (end)
+    {
+      *end = '\0';
+      end++;
+    }
+
+  if (!opd->did_prepare_new_sig)
+    {
+      gpg_error_t err;
+
+      err = prepare_new_sig (opd);
+      if (err)
+        return err;
+    }
+  assert (opd->did_prepare_new_sig);
+  opd->did_prepare_new_sig = 0;
+
+  assert (opd->current_sig);
+  sig = opd->current_sig;
+
+  /* FIXME: We should set the source of the state.  */
+  switch (code)
+    {
+    case GPGME_STATUS_GOODSIG:
+      sig->status = gpg_error (GPG_ERR_NO_ERROR);
+      break;
+
+    case GPGME_STATUS_EXPSIG:
+      sig->status = gpg_error (GPG_ERR_SIG_EXPIRED);
+      break;
+
+    case GPGME_STATUS_EXPKEYSIG:
+      sig->status = gpg_error (GPG_ERR_KEY_EXPIRED);
+      break;
+
+    case GPGME_STATUS_BADSIG:
+      sig->status = gpg_error (GPG_ERR_BAD_SIGNATURE);
+      break;
+
+    case GPGME_STATUS_REVKEYSIG:
+      sig->status = gpg_error (GPG_ERR_CERT_REVOKED);
+      break;
+
+    case GPGME_STATUS_ERRSIG:
+      /* Parse the pubkey algo.  */
+      if (!end)
+	goto parse_err_sig_fail;
+      errno = 0;
+      sig->pubkey_algo = strtol (end, &tail, 0);
+      if (errno || end == tail || *tail != ' ')
+	goto parse_err_sig_fail;
+      end = tail;
+      while (*end == ' ')
+	end++;
+     
+      /* Parse the hash algo.  */
+      if (!*end)
+	goto parse_err_sig_fail;
+      errno = 0;
+      sig->hash_algo = strtol (end, &tail, 0);
+      if (errno || end == tail || *tail != ' ')
+	goto parse_err_sig_fail;
+      end = tail;
+      while (*end == ' ')
+	end++;
+
+      /* Skip the sig class.  */
+      end = strchr (end, ' ');
+      if (!end)
+	goto parse_err_sig_fail;
+      while (*end == ' ')
+	end++;
+
+      /* Parse the timestamp.  */
+      sig->timestamp = _gpgme_parse_timestamp (end, &tail);
+      if (sig->timestamp == -1 || end == tail || (*tail && *tail != ' '))
+	return gpg_error (GPG_ERR_INV_ENGINE);
+      end = tail;
+      while (*end == ' ')
+	end++;
+      
+      /* Parse the return code.  */
+      if (end[0] && (!end[1] || end[1] == ' '))
+	{
+	  switch (end[0])
+	    {
+	    case '4':
+	      sig->status = gpg_error (GPG_ERR_UNSUPPORTED_ALGORITHM);
+	      break;
+	      
+	    case '9':
+	      sig->status = gpg_error (GPG_ERR_NO_PUBKEY);
+	      break;
+	      
+	    default:
+	      sig->status = gpg_error (GPG_ERR_GENERAL);
+	    }
+	}
+      else
+	goto parse_err_sig_fail;
+
+      goto parse_err_sig_ok;
+      
+    parse_err_sig_fail:
+      sig->status = gpg_error (GPG_ERR_GENERAL);
+    parse_err_sig_ok:
+      break;
+      
+    default:
+      return gpg_error (GPG_ERR_GENERAL);
+    }
+
+  if (*args)
+    {
+      sig->fpr = strdup (args);
+      if (!sig->fpr)
+	return gpg_error_from_errno (errno);
+    }
+  return 0;
+}
+
+
+static gpgme_error_t
+parse_valid_sig (gpgme_signature_t sig, char *args)
+{
+  char *end = strchr (args, ' ');
+  if (end)
+    {
+      *end = '\0';
+      end++;
+    }
+
+  if (!*args)
+    /* We require at least the fingerprint.  */
+    return gpg_error (GPG_ERR_GENERAL);
+
+  if (sig->fpr)
+    free (sig->fpr);
+  sig->fpr = strdup (args);
+  if (!sig->fpr)
+    return gpg_error_from_errno (errno);
+
+  /* Skip the creation date.  */
+  end = strchr (end, ' ');
+  if (end)
+    {
+      char *tail;
+
+      sig->timestamp = _gpgme_parse_timestamp (end, &tail);
+      if (sig->timestamp == -1 || end == tail || (*tail && *tail != ' '))
+	return gpg_error (GPG_ERR_INV_ENGINE);
+      end = tail;
+     
+      sig->exp_timestamp = _gpgme_parse_timestamp (end, &tail);
+      if (sig->exp_timestamp == -1 || end == tail || (*tail && *tail != ' '))
+	return gpg_error (GPG_ERR_INV_ENGINE);
+      end = tail;
+
+      while (*end == ' ')
+	end++;
+      /* Skip the signature version.  */
+      end = strchr (end, ' ');
+      if (end)
+	{
+	  while (*end == ' ')
+	    end++;
+
+	  /* Skip the reserved field.  */
+	  end = strchr (end, ' ');
+	  if (end)
+	    {
+	      /* Parse the pubkey algo.  */
+	      errno = 0;
+	      sig->pubkey_algo = strtol (end, &tail, 0);
+	      if (errno || end == tail || *tail != ' ')
+		return gpg_error (GPG_ERR_INV_ENGINE);
+	      end = tail;
+
+	      while (*end == ' ')
+		end++;
+
+	      if (*end)
+		{
+		  /* Parse the hash algo.  */
+
+		  errno = 0;
+		  sig->hash_algo = strtol (end, &tail, 0);
+		  if (errno || end == tail || *tail != ' ')
+		    return gpg_error (GPG_ERR_INV_ENGINE);
+		  end = tail;
+		}
+	    }
+	}
+    }
+  return 0;
+}
+
+
+static gpgme_error_t
+parse_notation (gpgme_signature_t sig, gpgme_status_code_t code, char *args)
+{
+  gpgme_error_t err;
+  gpgme_sig_notation_t *lastp = &sig->notations;
+  gpgme_sig_notation_t notation = sig->notations;
+  char *end = strchr (args, ' ');
+
+  if (end)
+    *end = '\0';
+
+  if (code == GPGME_STATUS_NOTATION_NAME || code == GPGME_STATUS_POLICY_URL)
+    {
+      /* FIXME: We could keep a pointer to the last notation in the list.  */
+      while (notation && notation->value)
+	{
+	  lastp = &notation->next;
+	  notation = notation->next;
+	}
+
+      if (notation)
+	/* There is another notation name without data for the
+	   previous one.  The crypto backend misbehaves.  */
+	return gpg_error (GPG_ERR_INV_ENGINE);
+
+      err = _gpgme_sig_notation_create (&notation, NULL, 0, NULL, 0, 0);
+      if (err)
+	return err;
+
+      if (code == GPGME_STATUS_NOTATION_NAME)
+	{
+	  err = _gpgme_decode_percent_string (args, &notation->name, 0, 0);
+	  if (err)
+	    {
+	      _gpgme_sig_notation_free (notation);
+	      return err;
+	    }
+
+	  notation->name_len = strlen (notation->name);
+
+	  /* FIXME: For now we fake the human-readable flag.  The
+	     critical flag can not be reported as it is not
+	     provided.  */
+	  notation->flags = GPGME_SIG_NOTATION_HUMAN_READABLE;
+	  notation->human_readable = 1;
+	}
+      else
+	{
+	  /* This is a policy URL.  */
+
+	  err = _gpgme_decode_percent_string (args, &notation->value, 0, 0);
+	  if (err)
+	    {
+	      _gpgme_sig_notation_free (notation);
+	      return err;
+	    }
+
+	  notation->value_len = strlen (notation->value);
+	}
+      *lastp = notation;
+    }
+  else if (code == GPGME_STATUS_NOTATION_DATA)
+    {
+      int len = strlen (args) + 1;
+      char *dest;
+
+      /* FIXME: We could keep a pointer to the last notation in the list.  */
+      while (notation && notation->next)
+	{
+	  lastp = &notation->next;
+	  notation = notation->next;
+	}
+
+      if (!notation || !notation->name)
+	/* There is notation data without a previous notation
+	   name.  The crypto backend misbehaves.  */
+	return gpg_error (GPG_ERR_INV_ENGINE);
+      
+      if (!notation->value)
+	{
+	  dest = notation->value = malloc (len);
+	  if (!dest)
+	    return gpg_error_from_errno (errno);
+	}
+      else
+	{
+	  int cur_len = strlen (notation->value);
+	  dest = realloc (notation->value, len + strlen (notation->value));
+	  if (!dest)
+	    return gpg_error_from_errno (errno);
+	  notation->value = dest;
+	  dest += cur_len;
+	}
+      
+      err = _gpgme_decode_percent_string (args, &dest, len, 0);
+      if (err)
+	return err;
+
+      notation->value_len += strlen (dest);
+    }
+  else
+    return gpg_error (GPG_ERR_INV_ENGINE);
+  return 0;
+}
+
+
+static gpgme_error_t
+parse_trust (gpgme_signature_t sig, gpgme_status_code_t code, char *args)
+{
+  char *end = strchr (args, ' ');
+
+  if (end)
+    *end = '\0';
+
+  switch (code)
+    {
+    case GPGME_STATUS_TRUST_UNDEFINED:
+    default:
+      sig->validity = GPGME_VALIDITY_UNKNOWN;
+      break;
+
+    case GPGME_STATUS_TRUST_NEVER:
+      sig->validity = GPGME_VALIDITY_NEVER;
+      break;
+
+    case GPGME_STATUS_TRUST_MARGINAL:
+      sig->validity = GPGME_VALIDITY_MARGINAL;
+      break;
+
+    case GPGME_STATUS_TRUST_FULLY:
+    case GPGME_STATUS_TRUST_ULTIMATE:
+      sig->validity = GPGME_VALIDITY_FULL;
+      break;
+    }
+
+  if (*args)
+    sig->validity_reason = _gpgme_map_gnupg_error (args);
+  else
+    sig->validity_reason = 0;
+
+  return 0;
+}
+
+
+/* Parse an error status line and if SET_STATUS is true update the
+   result status as appropriate.  With SET_STATUS being false, only
+   check for an error.  */
+static gpgme_error_t
+parse_error (gpgme_signature_t sig, char *args, int set_status)
+{
+  gpgme_error_t err;
+  char *where = strchr (args, ' ');
+  char *which;
+
+  if (where)
+    {
+      *where = '\0';
+      which = where + 1;
+
+      where = strchr (which, ' ');
+      if (where)
+	*where = '\0';
+
+      where = args;      
+    }
+  else
+    return gpg_error (GPG_ERR_INV_ENGINE);
+
+  err = _gpgme_map_gnupg_error (which);
+
+  if (!strcmp (where, "proc_pkt.plaintext")
+      && gpg_err_code (err) == GPG_ERR_BAD_DATA)
+    {
+      /* This indicates a double plaintext.  The only solid way to
+         handle this is by failing the oepration.  */
+      return gpg_error (GPG_ERR_BAD_DATA);
+    }
+  else if (!set_status)
+    ;
+  else if (!strcmp (where, "verify.findkey"))
+    sig->status = err;
+  else if (!strcmp (where, "verify.keyusage")
+	   && gpg_err_code (err) == GPG_ERR_WRONG_KEY_USAGE)
+    sig->wrong_key_usage = 1;
+
+  return 0;
+}
+
+
+gpgme_error_t
+_gpgme_verify_status_handler (void *priv, gpgme_status_code_t code, char *args)
+{
+  gpgme_ctx_t ctx = (gpgme_ctx_t) priv;
+  gpgme_error_t err;
+  void *hook;
+  op_data_t opd;
+  gpgme_signature_t sig;
+  char *end;
+
+  err = _gpgme_op_data_lookup (ctx, OPDATA_VERIFY, &hook, -1, NULL);
+  opd = hook;
+  if (err)
+    return err;
+
+  sig = opd->current_sig;
+
+  switch (code)
+    {
+    case GPGME_STATUS_NEWSIG:
+      if (sig)
+        calc_sig_summary (sig);
+      err = prepare_new_sig (opd);
+      opd->only_newsig_seen = 1;
+      return err;
+
+    case GPGME_STATUS_GOODSIG:
+    case GPGME_STATUS_EXPSIG:
+    case GPGME_STATUS_EXPKEYSIG:
+    case GPGME_STATUS_BADSIG:
+    case GPGME_STATUS_ERRSIG:
+    case GPGME_STATUS_REVKEYSIG:
+      if (sig && !opd->did_prepare_new_sig)
+	calc_sig_summary (sig);
+      opd->only_newsig_seen = 0;
+      return parse_new_sig (opd, code, args);
+
+    case GPGME_STATUS_VALIDSIG:
+      opd->only_newsig_seen = 0;
+      return sig ? parse_valid_sig (sig, args)
+	: gpg_error (GPG_ERR_INV_ENGINE);
+
+    case GPGME_STATUS_NODATA:
+      opd->only_newsig_seen = 0;
+      if (!sig)
+	return gpg_error (GPG_ERR_NO_DATA);
+      sig->status = gpg_error (GPG_ERR_NO_DATA);
+      break;
+
+    case GPGME_STATUS_UNEXPECTED:
+      opd->only_newsig_seen = 0;
+      if (!sig)
+	return gpg_error (GPG_ERR_GENERAL);
+      sig->status = gpg_error (GPG_ERR_NO_DATA);
+      break;
+
+    case GPGME_STATUS_NOTATION_NAME:
+    case GPGME_STATUS_NOTATION_DATA:
+    case GPGME_STATUS_POLICY_URL:
+      opd->only_newsig_seen = 0;
+      return sig ? parse_notation (sig, code, args)
+	: gpg_error (GPG_ERR_INV_ENGINE);
+
+    case GPGME_STATUS_TRUST_UNDEFINED:
+    case GPGME_STATUS_TRUST_NEVER:
+    case GPGME_STATUS_TRUST_MARGINAL:
+    case GPGME_STATUS_TRUST_FULLY:
+    case GPGME_STATUS_TRUST_ULTIMATE:
+      opd->only_newsig_seen = 0;
+      return sig ? parse_trust (sig, code, args)
+	: gpg_error (GPG_ERR_INV_ENGINE);
+
+    case GPGME_STATUS_PKA_TRUST_BAD:
+    case GPGME_STATUS_PKA_TRUST_GOOD:
+      opd->only_newsig_seen = 0;
+      /* Check that we only get one of these status codes per
+         signature; if not the crypto backend misbehaves.  */
+      if (!sig || sig->pka_trust || sig->pka_address)
+        return gpg_error (GPG_ERR_INV_ENGINE);
+      sig->pka_trust = code == GPGME_STATUS_PKA_TRUST_GOOD? 2 : 1;
+      end = strchr (args, ' ');
+      if (end)
+        *end = 0;
+      sig->pka_address = strdup (args);
+      break;
+
+    case GPGME_STATUS_ERROR:
+      opd->only_newsig_seen = 0;
+      /* Some  error stati are informational, so we don't return an
+         error code if we are not ready to process this status.  */
+      return parse_error (sig, args, !!sig );
+
+    case GPGME_STATUS_EOF:
+      if (sig && !opd->did_prepare_new_sig)
+	calc_sig_summary (sig);
+      if (opd->only_newsig_seen && sig)
+        {
+          gpgme_signature_t sig2;
+          /* The last signature has no valid information - remove it
+             from the list. */
+          assert (!sig->next);
+          if (sig == opd->result.signatures)
+            opd->result.signatures = NULL;
+          else
+            {
+              for (sig2 = opd->result.signatures; sig2; sig2 = sig2->next)
+                if (sig2->next == sig)
+                  {
+                    sig2->next = NULL;
+                    break;
+                  }
+            }
+          /* Note that there is no need to release the members of SIG
+             because we won't be here if they have been set. */
+          free (sig);
+          opd->current_sig = NULL;
+        }
+      opd->only_newsig_seen = 0;
+      break;
+
+    case GPGME_STATUS_PLAINTEXT:
+      if (++opd->plaintext_seen > 1)
+        return gpg_error (GPG_ERR_BAD_DATA);
+      err = _gpgme_parse_plaintext (args, &opd->result.file_name);
+      if (err)
+	return err;
+
+    default:
+      break;
+    }
+  return 0;
+}
+
+
+static gpgme_error_t
+verify_status_handler (void *priv, gpgme_status_code_t code, char *args)
+{
+  gpgme_error_t err;
+
+  err = _gpgme_progress_status_handler (priv, code, args);
+  if (!err)
+    err = _gpgme_verify_status_handler (priv, code, args);
+  return err;
+}
+
+
+gpgme_error_t
+_gpgme_op_verify_init_result (gpgme_ctx_t ctx)
+{  
+  void *hook;
+  op_data_t opd;
+
+  return _gpgme_op_data_lookup (ctx, OPDATA_VERIFY, &hook,
+				sizeof (*opd), release_op_data);
+}
+
+
+static gpgme_error_t
+verify_start (gpgme_ctx_t ctx, int synchronous, gpgme_data_t sig,
+	      gpgme_data_t signed_text, gpgme_data_t plaintext)
+{
+  gpgme_error_t err;
+
+  err = _gpgme_op_reset (ctx, synchronous);
+  if (err)
+    return err;
+
+  err = _gpgme_op_verify_init_result (ctx);
+  if (err)
+    return err;
+
+  _gpgme_engine_set_status_handler (ctx->engine, verify_status_handler, ctx);
+
+  if (!sig)
+    return gpg_error (GPG_ERR_NO_DATA);
+  if (!signed_text && !plaintext)
+    return gpg_error (GPG_ERR_INV_VALUE);
+
+  return _gpgme_engine_op_verify (ctx->engine, sig, signed_text, plaintext);
+}
+
+
+/* Decrypt ciphertext CIPHER and make a signature verification within
+   CTX and store the resulting plaintext in PLAIN.  */
+gpgme_error_t
+gpgme_op_verify_start (gpgme_ctx_t ctx, gpgme_data_t sig,
+		       gpgme_data_t signed_text, gpgme_data_t plaintext)
+{
+  return verify_start (ctx, 0, sig, signed_text, plaintext);
+}
+
+
+/* Decrypt ciphertext CIPHER and make a signature verification within
+   CTX and store the resulting plaintext in PLAIN.  */
+gpgme_error_t
+gpgme_op_verify (gpgme_ctx_t ctx, gpgme_data_t sig, gpgme_data_t signed_text,
+		 gpgme_data_t plaintext)
+{
+  gpgme_error_t err;
+
+  err = verify_start (ctx, 1, sig, signed_text, plaintext);
+  if (!err)
+    err = _gpgme_wait_one (ctx);
+  return err;
+}
+
+
+/* Compatibility interfaces.  */
+
+/* Get the key used to create signature IDX in CTX and return it in
+   R_KEY.  */
+gpgme_error_t
+gpgme_get_sig_key (gpgme_ctx_t ctx, int idx, gpgme_key_t *r_key)
+{
+  gpgme_verify_result_t result;
+  gpgme_signature_t sig;
+
+  result = gpgme_op_verify_result (ctx);
+  sig = result->signatures;
+
+  while (sig && idx)
+    {
+      sig = sig->next;
+      idx--;
+    }
+  if (!sig || idx)
+    return gpg_error (GPG_ERR_EOF);
+
+  return gpgme_get_key (ctx, sig->fpr, r_key, 0);
+}
+
+
+/* Retrieve the signature status of signature IDX in CTX after a
+   successful verify operation in R_STAT (if non-null).  The creation
+   time stamp of the signature is returned in R_CREATED (if non-null).
+   The function returns a string containing the fingerprint.  */
+const char *
+gpgme_get_sig_status (gpgme_ctx_t ctx, int idx,
+                      _gpgme_sig_stat_t *r_stat, time_t *r_created)
+{
+  gpgme_verify_result_t result;
+  gpgme_signature_t sig;
+
+  result = gpgme_op_verify_result (ctx);
+  sig = result->signatures;
+
+  while (sig && idx)
+    {
+      sig = sig->next;
+      idx--;
+    }
+  if (!sig || idx)
+    return NULL;
+
+  if (r_stat)
+    {
+      switch (gpg_err_code (sig->status))
+	{
+	case GPG_ERR_NO_ERROR:
+	  *r_stat = GPGME_SIG_STAT_GOOD;
+	  break;
+	  
+	case GPG_ERR_BAD_SIGNATURE:
+	  *r_stat = GPGME_SIG_STAT_BAD;
+	  break;
+	  
+	case GPG_ERR_NO_PUBKEY:
+	  *r_stat = GPGME_SIG_STAT_NOKEY;
+	  break;
+	  
+	case GPG_ERR_NO_DATA:
+	  *r_stat = GPGME_SIG_STAT_NOSIG;
+	  break;
+	  
+	case GPG_ERR_SIG_EXPIRED:
+	  *r_stat = GPGME_SIG_STAT_GOOD_EXP;
+	  break;
+	  
+	case GPG_ERR_KEY_EXPIRED:
+	  *r_stat = GPGME_SIG_STAT_GOOD_EXPKEY;
+	  break;
+	  
+	default:
+	  *r_stat = GPGME_SIG_STAT_ERROR;
+	  break;
+	}
+    }
+  if (r_created)
+    *r_created = sig->timestamp;
+  return sig->fpr;
+}
+
+
+/* Retrieve certain attributes of a signature.  IDX is the index
+   number of the signature after a successful verify operation.  WHAT
+   is an attribute where GPGME_ATTR_EXPIRE is probably the most useful
+   one.  WHATIDX is to be passed as 0 for most attributes . */
+unsigned long 
+gpgme_get_sig_ulong_attr (gpgme_ctx_t ctx, int idx,
+                          _gpgme_attr_t what, int whatidx)
+{
+  gpgme_verify_result_t result;
+  gpgme_signature_t sig;
+
+  result = gpgme_op_verify_result (ctx);
+  sig = result->signatures;
+
+  while (sig && idx)
+    {
+      sig = sig->next;
+      idx--;
+    }
+  if (!sig || idx)
+    return 0;
+
+  switch (what)
+    {
+    case GPGME_ATTR_CREATED:
+      return sig->timestamp;
+
+    case GPGME_ATTR_EXPIRE:
+      return sig->exp_timestamp;
+
+    case GPGME_ATTR_VALIDITY:
+      return (unsigned long) sig->validity;
+
+    case GPGME_ATTR_SIG_STATUS:
+      switch (gpg_err_code (sig->status))
+	{
+	case GPG_ERR_NO_ERROR:
+	  return GPGME_SIG_STAT_GOOD;
+	  
+	case GPG_ERR_BAD_SIGNATURE:
+	  return GPGME_SIG_STAT_BAD;
+	  
+	case GPG_ERR_NO_PUBKEY:
+	  return GPGME_SIG_STAT_NOKEY;
+	  
+	case GPG_ERR_NO_DATA:
+	  return GPGME_SIG_STAT_NOSIG;
+	  
+	case GPG_ERR_SIG_EXPIRED:
+	  return GPGME_SIG_STAT_GOOD_EXP;
+	  
+	case GPG_ERR_KEY_EXPIRED:
+	  return GPGME_SIG_STAT_GOOD_EXPKEY;
+	  
+	default:
+	  return GPGME_SIG_STAT_ERROR;
+	}
+
+    case GPGME_ATTR_SIG_SUMMARY:
+      return sig->summary;
+
+    default:
+      break;
+    }
+  return 0;
+}
+
+
+const char *
+gpgme_get_sig_string_attr (gpgme_ctx_t ctx, int idx,
+                           _gpgme_attr_t what, int whatidx)
+{
+  gpgme_verify_result_t result;
+  gpgme_signature_t sig;
+
+  result = gpgme_op_verify_result (ctx);
+  sig = result->signatures;
+
+  while (sig && idx)
+    {
+      sig = sig->next;
+      idx--;
+    }
+  if (!sig || idx)
+    return NULL;
+
+  switch (what)
+    {
+    case GPGME_ATTR_FPR:
+      return sig->fpr;
+
+    case GPGME_ATTR_ERRTOK:
+      if (whatidx == 1)
+        return sig->wrong_key_usage ? "Wrong_Key_Usage" : "";
+      else
+	return "";
+    default:
+      break;
+    }
+
+  return NULL;
+}