/*
- * The RSA public-key cryptosystem
+ * PDKIM - a RFC4871 (DKIM) implementation
*
- * Copyright (C) 2006-2010, Brainspark B.V.
+ * Copyright (C) 2016 Exim maintainers
*
- * This file is part of PolarSSL (http://www.polarssl.org)
- * Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
- *
- * All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program 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 General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
-/*
- * RSA was designed by Ron Rivest, Adi Shamir and Len Adleman.
- *
- * http://theory.lcs.mit.edu/~rivest/rsapaper.pdf
- * http://www.cacr.math.uwaterloo.ca/hac/about/chap8.pdf
+ * RSA signing/verification interface
*/
-/* $Cambridge: exim/src/src/pdkim/rsa.c,v 1.3 2009/12/07 13:05:07 tom Exp $ */
+#include "../exim.h"
-#include "rsa.h"
-#include "base64.h"
+#ifndef DISABLE_DKIM /* entire file */
+
+#ifndef SUPPORT_TLS
+# error Need SUPPORT_TLS for DKIM
+#endif
-#include <stdlib.h>
-#include <string.h>
-#include <stdio.h>
+#include "crypt_ver.h"
+#include "rsa.h"
+/******************************************************************************/
+#ifdef RSA_GNUTLS
-/* *************** begin copy from x509parse.c ********************/
-/*
- * ASN.1 DER decoding routines
- */
-static int asn1_get_len( unsigned char **p,
- const unsigned char *end,
- int *len )
+void
+exim_rsa_init(void)
{
- if( ( end - *p ) < 1 )
- return( POLARSSL_ERR_ASN1_OUT_OF_DATA );
-
- if( ( **p & 0x80 ) == 0 )
- *len = *(*p)++;
- else
- {
- switch( **p & 0x7F )
- {
- case 1:
- if( ( end - *p ) < 2 )
- return( POLARSSL_ERR_ASN1_OUT_OF_DATA );
-
- *len = (*p)[1];
- (*p) += 2;
- break;
-
- case 2:
- if( ( end - *p ) < 3 )
- return( POLARSSL_ERR_ASN1_OUT_OF_DATA );
-
- *len = ( (*p)[1] << 8 ) | (*p)[2];
- (*p) += 3;
- break;
-
- default:
- return( POLARSSL_ERR_ASN1_INVALID_LENGTH );
- break;
- }
- }
-
- if( *len > (int) ( end - *p ) )
- return( POLARSSL_ERR_ASN1_OUT_OF_DATA );
-
- return( 0 );
}
-static int asn1_get_tag( unsigned char **p,
- const unsigned char *end,
- int *len, int tag )
+
+/* accumulate data (gnutls-only). String to be appended must be nul-terminated. */
+blob *
+exim_rsa_data_append(blob * b, int * alloc, uschar * s)
{
- if( ( end - *p ) < 1 )
- return( POLARSSL_ERR_ASN1_OUT_OF_DATA );
+int len = b->len;
+b->data = string_append(b->data, alloc, &len, 1, s);
+b->len = len;
+return b;
+}
- if( **p != tag )
- return( POLARSSL_ERR_ASN1_UNEXPECTED_TAG );
- (*p)++;
- return( asn1_get_len( p, end, len ) );
-}
+/* import private key from PEM string in memory.
+Return: NULL for success, or an error string */
-static int asn1_get_int( unsigned char **p,
- const unsigned char *end,
- int *val )
+const uschar *
+exim_rsa_signing_init(uschar * privkey_pem, es_ctx * sign_ctx)
{
- int ret, len;
+gnutls_datum_t k;
+int rc;
- if( ( ret = asn1_get_tag( p, end, &len, ASN1_INTEGER ) ) != 0 )
- return( ret );
+k.data = privkey_pem;
+k.size = strlen(privkey_pem);
- if( len > (int) sizeof( int ) || ( **p & 0x80 ) != 0 )
- return( POLARSSL_ERR_ASN1_INVALID_LENGTH );
+if ( (rc = gnutls_x509_privkey_init(&sign_ctx->rsa)) != GNUTLS_E_SUCCESS
+ /*|| (rc = gnutls_x509_privkey_import(sign_ctx->rsa, &k,
+ GNUTLS_X509_FMT_PEM)) != GNUTLS_E_SUCCESS */
+ )
+ return gnutls_strerror(rc);
- *val = 0;
+if ( /* (rc = gnutls_x509_privkey_init(&sign_ctx->rsa)) != GNUTLS_E_SUCCESS
+ ||*/ (rc = gnutls_x509_privkey_import(sign_ctx->rsa, &k,
+ GNUTLS_X509_FMT_PEM)) != GNUTLS_E_SUCCESS
+ )
+ return gnutls_strerror(rc);
- while( len-- > 0 )
- {
- *val = ( *val << 8 ) | **p;
- (*p)++;
- }
-
- return( 0 );
+return NULL;
}
-static int asn1_get_mpi( unsigned char **p,
- const unsigned char *end,
- mpi *X )
-{
- int ret, len;
- if( ( ret = asn1_get_tag( p, end, &len, ASN1_INTEGER ) ) != 0 )
- return( ret );
- ret = mpi_read_binary( X, *p, len );
+/* allocate mem for signature (when signing) */
+/* sign data (gnutls_only)
+OR
+sign hash.
- *p += len;
+Return: NULL for success, or an error string */
- return( ret );
+const uschar *
+exim_rsa_sign(es_ctx * sign_ctx, BOOL is_sha1, blob * data, blob * sig)
+{
+gnutls_datum_t k;
+size_t sigsize = 0;
+int rc;
+const uschar * ret = NULL;
+
+/* Allocate mem for signature */
+k.data = data->data;
+k.size = data->len;
+(void) gnutls_x509_privkey_sign_data(sign_ctx->rsa,
+ is_sha1 ? GNUTLS_DIG_SHA1 : GNUTLS_DIG_SHA256,
+ 0, &k, NULL, &sigsize);
+
+sig->data = store_get(sigsize);
+sig->len = sigsize;
+
+/* Do signing */
+if ((rc = gnutls_x509_privkey_sign_data(sign_ctx->rsa,
+ is_sha1 ? GNUTLS_DIG_SHA1 : GNUTLS_DIG_SHA256,
+ 0, &k, sig->data, &sigsize)) != GNUTLS_E_SUCCESS
+ )
+ ret = gnutls_strerror(rc);
+
+gnutls_x509_privkey_deinit(sign_ctx->rsa);
+return ret;
}
-/* *************** end copy from x509parse.c ********************/
+/* import public key (from DER in memory)
+Return: NULL for success, or an error string */
-/*
- * Initialize an RSA context
- */
-void rsa_init( rsa_context *ctx,
- int padding,
- int hash_id )
+const uschar *
+exim_rsa_verify_init(blob * pubkey_der, ev_ctx * verify_ctx)
{
- memset( ctx, 0, sizeof( rsa_context ) );
+gnutls_datum_t k;
+int rc;
+const uschar * ret = NULL;
- ctx->padding = padding;
- ctx->hash_id = hash_id;
-}
+gnutls_pubkey_init(&verify_ctx->rsa);
-#if defined(POLARSSL_GENPRIME)
+k.data = pubkey_der->data;
+k.size = pubkey_der->len;
-/*
- * Generate an RSA keypair
- */
-int rsa_gen_key( rsa_context *ctx,
- int (*f_rng)(void *),
- void *p_rng,
- int nbits, int exponent )
-{
- int ret;
- mpi P1, Q1, H, G;
+if ((rc = gnutls_pubkey_import(verify_ctx->rsa, &k, GNUTLS_X509_FMT_DER))
+ != GNUTLS_E_SUCCESS)
+ ret = gnutls_strerror(rc);
+return ret;
+}
- if( f_rng == NULL || nbits < 128 || exponent < 3 )
- return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
- mpi_init( &P1, &Q1, &H, &G, NULL );
+/* verify signature (of hash) (given pubkey & alleged sig)
+Return: NULL for success, or an error string */
- /*
- * find primes P and Q with Q < P so that:
- * GCD( E, (P-1)*(Q-1) ) == 1
- */
- MPI_CHK( mpi_lset( &ctx->E, exponent ) );
+const uschar *
+exim_rsa_verify(ev_ctx * verify_ctx, BOOL is_sha1, blob * data_hash, blob * sig)
+{
+gnutls_datum_t k, s;
+int rc;
+const uschar * ret = NULL;
+
+k.data = data_hash->data;
+k.size = data_hash->len;
+s.data = sig->data;
+s.size = sig->len;
+if ((rc = gnutls_pubkey_verify_hash2(verify_ctx->rsa,
+ is_sha1 ? GNUTLS_SIGN_RSA_SHA1 : GNUTLS_SIGN_RSA_SHA256,
+ 0, &k, &s)) < 0)
+ ret = gnutls_strerror(rc);
+
+gnutls_pubkey_deinit(verify_ctx->rsa);
+return ret;
+}
- do
- {
- MPI_CHK( mpi_gen_prime( &ctx->P, ( nbits + 1 ) >> 1, 0,
- f_rng, p_rng ) );
- MPI_CHK( mpi_gen_prime( &ctx->Q, ( nbits + 1 ) >> 1, 0,
- f_rng, p_rng ) );
- if( mpi_cmp_mpi( &ctx->P, &ctx->Q ) < 0 )
- mpi_swap( &ctx->P, &ctx->Q );
- if( mpi_cmp_mpi( &ctx->P, &ctx->Q ) == 0 )
- continue;
+#elif defined(RSA_GCRYPT)
+/******************************************************************************/
- MPI_CHK( mpi_mul_mpi( &ctx->N, &ctx->P, &ctx->Q ) );
- if( mpi_msb( &ctx->N ) != nbits )
- continue;
- MPI_CHK( mpi_sub_int( &P1, &ctx->P, 1 ) );
- MPI_CHK( mpi_sub_int( &Q1, &ctx->Q, 1 ) );
- MPI_CHK( mpi_mul_mpi( &H, &P1, &Q1 ) );
- MPI_CHK( mpi_gcd( &G, &ctx->E, &H ) );
- }
- while( mpi_cmp_int( &G, 1 ) != 0 );
+/* Internal service routine:
+Read and move past an asn.1 header, checking class & tag,
+optionally returning the data-length */
- /*
- * D = E^-1 mod ((P-1)*(Q-1))
- * DP = D mod (P - 1)
- * DQ = D mod (Q - 1)
- * QP = Q^-1 mod P
- */
- MPI_CHK( mpi_inv_mod( &ctx->D , &ctx->E, &H ) );
- MPI_CHK( mpi_mod_mpi( &ctx->DP, &ctx->D, &P1 ) );
- MPI_CHK( mpi_mod_mpi( &ctx->DQ, &ctx->D, &Q1 ) );
- MPI_CHK( mpi_inv_mod( &ctx->QP, &ctx->Q, &ctx->P ) );
+static int
+as_tag(blob * der, uschar req_cls, long req_tag, long * alen)
+{
+int rc;
+uschar tag_class;
+int taglen;
+long tag, len;
- ctx->len = ( mpi_msb( &ctx->N ) + 7 ) >> 3;
+/* debug_printf("as_tag: %02x %02x %02x %02x\n",
+ der->data[0], der->data[1], der->data[2], der->data[3]); */
-cleanup:
+if ((rc = asn1_get_tag_der(der->data++, der->len--, &tag_class, &taglen, &tag))
+ != ASN1_SUCCESS)
+ return rc;
- mpi_free( &G, &H, &Q1, &P1, NULL );
+if (tag_class != req_cls || tag != req_tag) return ASN1_ELEMENT_NOT_FOUND;
- if( ret != 0 )
- {
- rsa_free( ctx );
- return( POLARSSL_ERR_RSA_KEY_GEN_FAILED | ret );
- }
+if ((len = asn1_get_length_der(der->data, der->len, &taglen)) < 0)
+ return ASN1_DER_ERROR;
+if (alen) *alen = len;
- return( 0 );
+/* debug_printf("as_tag: tlen %d dlen %d\n", taglen, (int)len); */
+
+der->data += taglen;
+der->len -= taglen;
+return rc;
}
-#endif
+/* Internal service routine:
+Read and move over an asn.1 integer, setting an MPI to the value
+*/
-/*
- * Check a public RSA key
- */
-int rsa_check_pubkey( const rsa_context *ctx )
+static uschar *
+as_mpi(blob * der, gcry_mpi_t * mpi)
{
- if( !ctx->N.p || !ctx->E.p )
- return( POLARSSL_ERR_RSA_KEY_CHECK_FAILED );
-
- if( ( ctx->N.p[0] & 1 ) == 0 ||
- ( ctx->E.p[0] & 1 ) == 0 )
- return( POLARSSL_ERR_RSA_KEY_CHECK_FAILED );
+long alen;
+int rc;
+gcry_error_t gerr;
- if( mpi_msb( &ctx->N ) < 128 ||
- mpi_msb( &ctx->N ) > 4096 )
- return( POLARSSL_ERR_RSA_KEY_CHECK_FAILED );
+/* integer; move past the header */
+if ((rc = as_tag(der, 0, ASN1_TAG_INTEGER, &alen)) != ASN1_SUCCESS)
+ return US asn1_strerror(rc);
- if( mpi_msb( &ctx->E ) < 2 ||
- mpi_msb( &ctx->E ) > 64 )
- return( POLARSSL_ERR_RSA_KEY_CHECK_FAILED );
+/* read to an MPI */
+if ((gerr = gcry_mpi_scan(mpi, GCRYMPI_FMT_STD, der->data, alen, NULL)))
+ return US gcry_strerror(gerr);
- return( 0 );
+/* move over the data */
+der->data += alen; der->len -= alen;
+return NULL;
}
-/*
- * Check a private RSA key
- */
-int rsa_check_privkey( const rsa_context *ctx )
-{
- int ret;
- mpi PQ, DE, P1, Q1, H, I, G, G2, L1, L2;
-
- if( ( ret = rsa_check_pubkey( ctx ) ) != 0 )
- return( ret );
-
- if( !ctx->P.p || !ctx->Q.p || !ctx->D.p )
- return( POLARSSL_ERR_RSA_KEY_CHECK_FAILED );
-
- mpi_init( &PQ, &DE, &P1, &Q1, &H, &I, &G, &G2, &L1, &L2, NULL );
-
- MPI_CHK( mpi_mul_mpi( &PQ, &ctx->P, &ctx->Q ) );
- MPI_CHK( mpi_mul_mpi( &DE, &ctx->D, &ctx->E ) );
- MPI_CHK( mpi_sub_int( &P1, &ctx->P, 1 ) );
- MPI_CHK( mpi_sub_int( &Q1, &ctx->Q, 1 ) );
- MPI_CHK( mpi_mul_mpi( &H, &P1, &Q1 ) );
- MPI_CHK( mpi_gcd( &G, &ctx->E, &H ) );
-
- MPI_CHK( mpi_gcd( &G2, &P1, &Q1 ) );
- MPI_CHK( mpi_div_mpi( &L1, &L2, &H, &G2 ) );
- MPI_CHK( mpi_mod_mpi( &I, &DE, &L1 ) );
-
- /*
- * Check for a valid PKCS1v2 private key
- */
- if( mpi_cmp_mpi( &PQ, &ctx->N ) == 0 &&
- mpi_cmp_int( &L2, 0 ) == 0 &&
- mpi_cmp_int( &I, 1 ) == 0 &&
- mpi_cmp_int( &G, 1 ) == 0 )
- {
- mpi_free( &G, &I, &H, &Q1, &P1, &DE, &PQ, &G2, &L1, &L2, NULL );
- return( 0 );
- }
-
-
-cleanup:
-
- mpi_free( &G, &I, &H, &Q1, &P1, &DE, &PQ, &G2, &L1, &L2, NULL );
- return( POLARSSL_ERR_RSA_KEY_CHECK_FAILED | ret );
-}
-/*
- * Do an RSA public key operation
- */
-int rsa_public( rsa_context *ctx,
- const unsigned char *input,
- unsigned char *output )
-{
- int ret, olen;
- mpi T;
- mpi_init( &T, NULL );
+void
+exim_rsa_init(void)
+{
+/* Version check should be the very first call because it
+makes sure that important subsystems are initialized. */
+if (!gcry_check_version (GCRYPT_VERSION))
+ {
+ fputs ("libgcrypt version mismatch\n", stderr);
+ exit (2);
+ }
- MPI_CHK( mpi_read_binary( &T, input, ctx->len ) );
+/* We don't want to see any warnings, e.g. because we have not yet
+parsed program options which might be used to suppress such
+warnings. */
+gcry_control (GCRYCTL_SUSPEND_SECMEM_WARN);
- if( mpi_cmp_mpi( &T, &ctx->N ) >= 0 )
- {
- mpi_free( &T, NULL );
- return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
- }
+/* ... If required, other initialization goes here. Note that the
+process might still be running with increased privileges and that
+the secure memory has not been initialized. */
- olen = ctx->len;
- MPI_CHK( mpi_exp_mod( &T, &T, &ctx->E, &ctx->N, &ctx->RN ) );
- MPI_CHK( mpi_write_binary( &T, output, olen ) );
+/* Allocate a pool of 16k secure memory. This make the secure memory
+available and also drops privileges where needed. */
+gcry_control (GCRYCTL_INIT_SECMEM, 16384, 0);
-cleanup:
+/* It is now okay to let Libgcrypt complain when there was/is
+a problem with the secure memory. */
+gcry_control (GCRYCTL_RESUME_SECMEM_WARN);
- mpi_free( &T, NULL );
+/* ... If required, other initialization goes here. */
- if( ret != 0 )
- return( POLARSSL_ERR_RSA_PUBLIC_FAILED | ret );
+/* Tell Libgcrypt that initialization has completed. */
+gcry_control (GCRYCTL_INITIALIZATION_FINISHED, 0);
- return( 0 );
+return;
}
-/*
- * Do an RSA private key operation
- */
-int rsa_private( rsa_context *ctx,
- const unsigned char *input,
- unsigned char *output )
-{
- int ret, olen;
- mpi T, T1, T2;
-
- mpi_init( &T, &T1, &T2, NULL );
-
- MPI_CHK( mpi_read_binary( &T, input, ctx->len ) );
-
- if( mpi_cmp_mpi( &T, &ctx->N ) >= 0 )
- {
- mpi_free( &T, NULL );
- return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
- }
-
-#if 0
- MPI_CHK( mpi_exp_mod( &T, &T, &ctx->D, &ctx->N, &ctx->RN ) );
-#else
- /*
- * faster decryption using the CRT
- *
- * T1 = input ^ dP mod P
- * T2 = input ^ dQ mod Q
- */
- MPI_CHK( mpi_exp_mod( &T1, &T, &ctx->DP, &ctx->P, &ctx->RP ) );
- MPI_CHK( mpi_exp_mod( &T2, &T, &ctx->DQ, &ctx->Q, &ctx->RQ ) );
-
- /*
- * T = (T1 - T2) * (Q^-1 mod P) mod P
- */
- MPI_CHK( mpi_sub_mpi( &T, &T1, &T2 ) );
- MPI_CHK( mpi_mul_mpi( &T1, &T, &ctx->QP ) );
- MPI_CHK( mpi_mod_mpi( &T, &T1, &ctx->P ) );
-
- /*
- * output = T2 + T * Q
- */
- MPI_CHK( mpi_mul_mpi( &T1, &T, &ctx->Q ) );
- MPI_CHK( mpi_add_mpi( &T, &T2, &T1 ) );
-#endif
-
- olen = ctx->len;
- MPI_CHK( mpi_write_binary( &T, output, olen ) );
-cleanup:
- mpi_free( &T, &T1, &T2, NULL );
- if( ret != 0 )
- return( POLARSSL_ERR_RSA_PRIVATE_FAILED | ret );
+/* Accumulate data (gnutls-only).
+String to be appended must be nul-terminated. */
- return( 0 );
+blob *
+exim_rsa_data_append(blob * b, int * alloc, uschar * s)
+{
+return b; /*dummy*/
}
-/*
- * Add the message padding, then do an RSA operation
- */
-int rsa_pkcs1_encrypt( rsa_context *ctx,
- int (*f_rng)(void *),
- void *p_rng,
- int mode, int ilen,
- const unsigned char *input,
- unsigned char *output )
-{
- int nb_pad, olen;
- unsigned char *p = output;
- olen = ctx->len;
- switch( ctx->padding )
- {
- case RSA_PKCS_V15:
+/* import private key from PEM string in memory.
+Return: NULL for success, or an error string */
- if( ilen < 0 || olen < ilen + 11 || f_rng == NULL )
- return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
+const uschar *
+exim_rsa_signing_init(uschar * privkey_pem, es_ctx * sign_ctx)
+{
+uschar * s1, * s2;
+blob der;
+long alen;
+int rc;
- nb_pad = olen - 3 - ilen;
+/*
+ * RSAPrivateKey ::= SEQUENCE
+ * version Version,
+ * modulus INTEGER, -- n
+ * publicExponent INTEGER, -- e
+ * privateExponent INTEGER, -- d
+ * prime1 INTEGER, -- p
+ * prime2 INTEGER, -- q
+ * exponent1 INTEGER, -- d mod (p-1)
+ * exponent2 INTEGER, -- d mod (q-1)
+ * coefficient INTEGER, -- (inverse of q) mod p
+ * otherPrimeInfos OtherPrimeInfos OPTIONAL
+ */
+
+if ( !(s1 = Ustrstr(CS privkey_pem, "-----BEGIN RSA PRIVATE KEY-----"))
+ || !(s2 = Ustrstr(CS (s1+=31), "-----END RSA PRIVATE KEY-----" ))
+ )
+ return US"Bad PEM wrapper";
+
+*s2 = '\0';
+
+if ((der.len = b64decode(s1, &der.data)) < 0)
+ return US"Bad PEM-DER b64 decode";
+
+/* untangle asn.1 */
+
+/* sequence; just move past the header */
+if ((rc = as_tag(&der, ASN1_CLASS_STRUCTURED, ASN1_TAG_SEQUENCE, NULL))
+ != ASN1_SUCCESS) goto asn_err;
+
+/* integer version; move past the header, check is zero */
+if ((rc = as_tag(&der, 0, ASN1_TAG_INTEGER, &alen)) != ASN1_SUCCESS)
+ goto asn_err;
+if (alen != 1 || *der.data != 0)
+ return US"Bad version number";
+der.data++; der.len--;
+
+if ( (s1 = as_mpi(&der, &sign_ctx->n))
+ || (s1 = as_mpi(&der, &sign_ctx->e))
+ || (s1 = as_mpi(&der, &sign_ctx->d))
+ || (s1 = as_mpi(&der, &sign_ctx->p))
+ || (s1 = as_mpi(&der, &sign_ctx->q))
+ || (s1 = as_mpi(&der, &sign_ctx->dp))
+ || (s1 = as_mpi(&der, &sign_ctx->dq))
+ || (s1 = as_mpi(&der, &sign_ctx->qp))
+ )
+ return s1;
+
+DEBUG(D_acl) debug_printf("rsa_signing_init:\n");
+ {
+ uschar * s;
+ gcry_mpi_aprint (GCRYMPI_FMT_HEX, &s, NULL, sign_ctx->n);
+ debug_printf(" N : %s\n", s);
+ gcry_mpi_aprint (GCRYMPI_FMT_HEX, &s, NULL, sign_ctx->e);
+ debug_printf(" E : %s\n", s);
+ gcry_mpi_aprint (GCRYMPI_FMT_HEX, &s, NULL, sign_ctx->d);
+ debug_printf(" D : %s\n", s);
+ gcry_mpi_aprint (GCRYMPI_FMT_HEX, &s, NULL, sign_ctx->p);
+ debug_printf(" P : %s\n", s);
+ gcry_mpi_aprint (GCRYMPI_FMT_HEX, &s, NULL, sign_ctx->q);
+ debug_printf(" Q : %s\n", s);
+ gcry_mpi_aprint (GCRYMPI_FMT_HEX, &s, NULL, sign_ctx->dp);
+ debug_printf(" DP: %s\n", s);
+ gcry_mpi_aprint (GCRYMPI_FMT_HEX, &s, NULL, sign_ctx->dq);
+ debug_printf(" DQ: %s\n", s);
+ gcry_mpi_aprint (GCRYMPI_FMT_HEX, &s, NULL, sign_ctx->qp);
+ debug_printf(" QP: %s\n", s);
+ }
+return NULL;
+
+asn_err: return US asn1_strerror(rc);
+}
- *p++ = 0;
- *p++ = RSA_CRYPT;
- while( nb_pad-- > 0 )
- {
- int rng_dl = 100;
- do {
- *p = (unsigned char) f_rng( p_rng );
- } while( *p == 0 && --rng_dl );
+/* allocate mem for signature (when signing) */
+/* sign data (gnutls_only)
+OR
+sign hash.
- // Check if RNG failed to generate data
- //
- if( rng_dl == 0 )
- return POLARSSL_ERR_RSA_RNG_FAILED;
+Return: NULL for success, or an error string */
- p++;
- }
- *p++ = 0;
- memcpy( p, input, ilen );
- break;
+const uschar *
+exim_rsa_sign(es_ctx * sign_ctx, BOOL is_sha1, blob * data, blob * sig)
+{
+gcry_sexp_t s_hash = NULL, s_key = NULL, s_sig = NULL;
+gcry_mpi_t m_sig;
+uschar * errstr;
+gcry_error_t gerr;
+
+#define SIGSPACE 128
+sig->data = store_get(SIGSPACE);
+
+if (gcry_mpi_cmp (sign_ctx->p, sign_ctx->q) > 0)
+ {
+ gcry_mpi_swap (sign_ctx->p, sign_ctx->q);
+ gcry_mpi_invm (sign_ctx->qp, sign_ctx->p, sign_ctx->q);
+ }
+
+if ( (gerr = gcry_sexp_build (&s_key, NULL,
+ "(private-key (rsa (n%m)(e%m)(d%m)(p%m)(q%m)(u%m)))",
+ sign_ctx->n, sign_ctx->e,
+ sign_ctx->d, sign_ctx->p,
+ sign_ctx->q, sign_ctx->qp))
+ || (gerr = gcry_sexp_build (&s_hash, NULL,
+ is_sha1
+ ? "(data(flags pkcs1)(hash sha1 %b))"
+ : "(data(flags pkcs1)(hash sha256 %b))",
+ (int) data->len, CS data->data))
+ || (gerr = gcry_pk_sign (&s_sig, s_hash, s_key))
+ )
+ return US gcry_strerror(gerr);
+
+/* gcry_sexp_dump(s_sig); */
+
+if ( !(s_sig = gcry_sexp_find_token(s_sig, "s", 0))
+ )
+ return US"no sig result";
+
+m_sig = gcry_sexp_nth_mpi(s_sig, 1, GCRYMPI_FMT_USG);
+
+DEBUG(D_acl)
+ {
+ uschar * s;
+ gcry_mpi_aprint (GCRYMPI_FMT_HEX, &s, NULL, m_sig);
+ debug_printf(" SG: %s\n", s);
+ }
+
+gerr = gcry_mpi_print(GCRYMPI_FMT_USG, sig->data, SIGSPACE, &sig->len, m_sig);
+if (gerr)
+ {
+ debug_printf("signature conversion from MPI to buffer failed\n");
+ return US gcry_strerror(gerr);
+ }
+#undef SIGSPACE
+
+return NULL;
+}
- default:
- return( POLARSSL_ERR_RSA_INVALID_PADDING );
- }
+/* import public key (from DER in memory)
+Return: NULL for success, or an error string */
- return( ( mode == RSA_PUBLIC )
- ? rsa_public( ctx, output, output )
- : rsa_private( ctx, output, output ) );
-}
+const uschar *
+exim_rsa_verify_init(blob * pubkey_der, ev_ctx * verify_ctx)
+{
+/*
+in code sequence per b81207d2bfa92 rsa_parse_public_key() and asn1_get_mpi()
+*/
+uschar tag_class;
+int taglen;
+long alen;
+int rc;
+uschar * errstr;
+gcry_error_t gerr;
+uschar * stage = US"S1";
/*
- * Do an RSA operation, then remove the message padding
- */
-int rsa_pkcs1_decrypt( rsa_context *ctx,
- int mode, int *olen,
- const unsigned char *input,
- unsigned char *output,
- int output_max_len)
-{
- int ret, ilen;
- unsigned char *p;
- unsigned char buf[1024];
+sequence
+ sequence
+ OBJECT:rsaEncryption
+ NULL
+ BIT STRING:RSAPublicKey
+ sequence
+ INTEGER:Public modulus
+ INTEGER:Public exponent
+
+openssl rsa -in aux-fixed/dkim/dkim.private -pubout -outform DER | od -t x1 | head;
+openssl rsa -in aux-fixed/dkim/dkim.private -pubout | openssl asn1parse -dump;
+openssl rsa -in aux-fixed/dkim/dkim.private -pubout | openssl asn1parse -dump -offset 22;
+*/
- ilen = ctx->len;
+/* sequence; just move past the header */
+if ((rc = as_tag(pubkey_der, ASN1_CLASS_STRUCTURED, ASN1_TAG_SEQUENCE, NULL))
+ != ASN1_SUCCESS) goto asn_err;
+
+/* sequence; skip the entire thing */
+DEBUG(D_acl) stage = US"S2";
+if ((rc = as_tag(pubkey_der, ASN1_CLASS_STRUCTURED, ASN1_TAG_SEQUENCE, &alen))
+ != ASN1_SUCCESS) goto asn_err;
+pubkey_der->data += alen; pubkey_der->len -= alen;
+
+
+/* bitstring: limit range to size of bitstring;
+move over header + content wrapper */
+DEBUG(D_acl) stage = US"BS";
+if ((rc = as_tag(pubkey_der, 0, ASN1_TAG_BIT_STRING, &alen)) != ASN1_SUCCESS)
+ goto asn_err;
+pubkey_der->len = alen;
+pubkey_der->data++; pubkey_der->len--;
+
+/* sequence; just move past the header */
+DEBUG(D_acl) stage = US"S3";
+if ((rc = as_tag(pubkey_der, ASN1_CLASS_STRUCTURED, ASN1_TAG_SEQUENCE, NULL))
+ != ASN1_SUCCESS) goto asn_err;
+
+/* read two integers */
+DEBUG(D_acl) stage = US"MPI";
+if ( (errstr = as_mpi(pubkey_der, &verify_ctx->n))
+ || (errstr = as_mpi(pubkey_der, &verify_ctx->e))
+ )
+ return errstr;
+
+DEBUG(D_acl) debug_printf("rsa_verify_init:\n");
+ {
+ uschar * s;
+ gcry_mpi_aprint (GCRYMPI_FMT_HEX, &s, NULL, verify_ctx->n);
+ debug_printf(" N : %s\n", s);
+ gcry_mpi_aprint (GCRYMPI_FMT_HEX, &s, NULL, verify_ctx->e);
+ debug_printf(" E : %s\n", s);
+ }
+
+return NULL;
+
+asn_err:
+DEBUG(D_acl) return string_sprintf("%s: %s", stage, asn1_strerror(rc));
+ return US asn1_strerror(rc);
+}
- if( ilen < 16 || ilen > (int) sizeof( buf ) )
- return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
- ret = ( mode == RSA_PUBLIC )
- ? rsa_public( ctx, input, buf )
- : rsa_private( ctx, input, buf );
+/* verify signature (of hash) (given pubkey & alleged sig)
+Return: NULL for success, or an error string */
- if( ret != 0 )
- return( ret );
+const uschar *
+exim_rsa_verify(ev_ctx * verify_ctx, BOOL is_sha1, blob * data_hash, blob * sig)
+{
+/*
+cf. libgnutls 2.8.5 _wrap_gcry_pk_verify()
+*/
+gcry_mpi_t m_sig;
+gcry_sexp_t s_sig = NULL, s_hash = NULL, s_pkey = NULL;
+gcry_error_t gerr;
+uschar * stage;
+
+if ( (stage = US"pkey sexp build",
+ gerr = gcry_sexp_build (&s_pkey, NULL, "(public-key(rsa(n%m)(e%m)))",
+ verify_ctx->n, verify_ctx->e))
+ || (stage = US"data sexp build",
+ gerr = gcry_sexp_build (&s_hash, NULL,
+ is_sha1
+ ? "(data(flags pkcs1)(hash sha1 %b))"
+ : "(data(flags pkcs1)(hash sha256 %b))",
+ (int) data_hash->len, CS data_hash->data))
+ || (stage = US"sig mpi scan",
+ gerr = gcry_mpi_scan(&m_sig, GCRYMPI_FMT_USG, sig->data, sig->len, NULL))
+ || (stage = US"sig sexp build",
+ gerr = gcry_sexp_build (&s_sig, NULL, "(sig-val(rsa(s%m)))", m_sig))
+ || (stage = US"verify",
+ gerr = gcry_pk_verify (s_sig, s_hash, s_pkey))
+ )
+ {
+ DEBUG(D_acl) debug_printf("verify: error in stage '%s'\n", stage);
+ return US gcry_strerror(gerr);
+ }
+
+if (s_sig) gcry_sexp_release (s_sig);
+if (s_hash) gcry_sexp_release (s_hash);
+if (s_pkey) gcry_sexp_release (s_pkey);
+gcry_mpi_release (m_sig);
+gcry_mpi_release (verify_ctx->n);
+gcry_mpi_release (verify_ctx->e);
+
+return NULL;
+}
- p = buf;
- switch( ctx->padding )
- {
- case RSA_PKCS_V15:
- if( *p++ != 0 || *p++ != RSA_CRYPT )
- return( POLARSSL_ERR_RSA_INVALID_PADDING );
- while( *p != 0 )
- {
- if( p >= buf + ilen - 1 )
- return( POLARSSL_ERR_RSA_INVALID_PADDING );
- p++;
- }
- p++;
- break;
+#elif defined(RSA_OPENSSL)
+/******************************************************************************/
- default:
+void
+exim_rsa_init(void)
+{
+}
- return( POLARSSL_ERR_RSA_INVALID_PADDING );
- }
- if (ilen - (int)(p - buf) > output_max_len)
- return( POLARSSL_ERR_RSA_OUTPUT_TOO_LARGE );
+/* accumulate data (gnutls-only) */
+blob *
+exim_rsa_data_append(blob * b, int * alloc, uschar * s)
+{
+return b; /*dummy*/
+}
- *olen = ilen - (int)(p - buf);
- memcpy( output, p, *olen );
- return( 0 );
-}
+/* import private key from PEM string in memory.
+Return: NULL for success, or an error string */
-/*
- * Do an RSA operation to sign the message digest
- */
-int rsa_pkcs1_sign( rsa_context *ctx,
- int mode,
- int hash_id,
- int hashlen,
- const unsigned char *hash,
- unsigned char *sig )
+const uschar *
+exim_rsa_signing_init(uschar * privkey_pem, es_ctx * sign_ctx)
{
- int nb_pad, olen;
- unsigned char *p = sig;
-
- olen = ctx->len;
-
- switch( ctx->padding )
- {
- case RSA_PKCS_V15:
-
- switch( hash_id )
- {
- case SIG_RSA_RAW:
- nb_pad = olen - 3 - hashlen;
- break;
-
- case SIG_RSA_MD2:
- case SIG_RSA_MD4:
- case SIG_RSA_MD5:
- nb_pad = olen - 3 - 34;
- break;
-
- case SIG_RSA_SHA1:
- nb_pad = olen - 3 - 35;
- break;
-
- case SIG_RSA_SHA224:
- nb_pad = olen - 3 - 47;
- break;
-
- case SIG_RSA_SHA256:
- nb_pad = olen - 3 - 51;
- break;
-
- case SIG_RSA_SHA384:
- nb_pad = olen - 3 - 67;
- break;
-
- case SIG_RSA_SHA512:
- nb_pad = olen - 3 - 83;
- break;
-
-
- default:
- return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
- }
-
- if( nb_pad < 8 )
- return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
-
- *p++ = 0;
- *p++ = RSA_SIGN;
- memset( p, 0xFF, nb_pad );
- p += nb_pad;
- *p++ = 0;
- break;
-
- default:
-
- return( POLARSSL_ERR_RSA_INVALID_PADDING );
- }
-
- switch( hash_id )
- {
- case SIG_RSA_RAW:
- memcpy( p, hash, hashlen );
- break;
-
- case SIG_RSA_MD2:
- memcpy( p, ASN1_HASH_MDX, 18 );
- memcpy( p + 18, hash, 16 );
- p[13] = 2; break;
-
- case SIG_RSA_MD4:
- memcpy( p, ASN1_HASH_MDX, 18 );
- memcpy( p + 18, hash, 16 );
- p[13] = 4; break;
-
- case SIG_RSA_MD5:
- memcpy( p, ASN1_HASH_MDX, 18 );
- memcpy( p + 18, hash, 16 );
- p[13] = 5; break;
-
- case SIG_RSA_SHA1:
- memcpy( p, ASN1_HASH_SHA1, 15 );
- memcpy( p + 15, hash, 20 );
- break;
-
- case SIG_RSA_SHA224:
- memcpy( p, ASN1_HASH_SHA2X, 19 );
- memcpy( p + 19, hash, 28 );
- p[1] += 28; p[14] = 4; p[18] += 28; break;
-
- case SIG_RSA_SHA256:
- memcpy( p, ASN1_HASH_SHA2X, 19 );
- memcpy( p + 19, hash, 32 );
- p[1] += 32; p[14] = 1; p[18] += 32; break;
-
- case SIG_RSA_SHA384:
- memcpy( p, ASN1_HASH_SHA2X, 19 );
- memcpy( p + 19, hash, 48 );
- p[1] += 48; p[14] = 2; p[18] += 48; break;
-
- case SIG_RSA_SHA512:
- memcpy( p, ASN1_HASH_SHA2X, 19 );
- memcpy( p + 19, hash, 64 );
- p[1] += 64; p[14] = 3; p[18] += 64; break;
-
- default:
- return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
- }
-
- return( ( mode == RSA_PUBLIC )
- ? rsa_public( ctx, sig, sig )
- : rsa_private( ctx, sig, sig ) );
+uschar * p, * q;
+int len;
+
+/* Convert PEM to DER */
+if ( !(p = Ustrstr(privkey_pem, "-----BEGIN RSA PRIVATE KEY-----"))
+ || !(q = Ustrstr(p+=31, "-----END RSA PRIVATE KEY-----"))
+ )
+ return US"Bad PEM wrapping";
+
+*q = '\0';
+if ((len = b64decode(p, &p)) < 0)
+ return US"b64decode failed";
+
+if (!(sign_ctx->rsa = d2i_RSAPrivateKey(NULL, CUSS &p, len)))
+ {
+ char ssl_errstring[256];
+ ERR_load_crypto_strings(); /*XXX move to a startup routine */
+ ERR_error_string(ERR_get_error(), ssl_errstring);
+ return string_copy(US ssl_errstring);
+ }
+
+return NULL;
}
-/*
- * Do an RSA operation and check the message digest
- */
-int rsa_pkcs1_verify( rsa_context *ctx,
- int mode,
- int hash_id,
- int hashlen,
- const unsigned char *hash,
- unsigned char *sig )
-{
- int ret, len, siglen;
- unsigned char *p, c;
- unsigned char buf[1024];
-
- siglen = ctx->len;
-
- if( siglen < 16 || siglen > (int) sizeof( buf ) )
- return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
-
- ret = ( mode == RSA_PUBLIC )
- ? rsa_public( ctx, sig, buf )
- : rsa_private( ctx, sig, buf );
-
- if( ret != 0 )
- return( ret );
-
- p = buf;
-
- switch( ctx->padding )
- {
- case RSA_PKCS_V15:
-
- if( *p++ != 0 || *p++ != RSA_SIGN )
- return( POLARSSL_ERR_RSA_INVALID_PADDING );
-
- while( *p != 0 )
- {
- if( p >= buf + siglen - 1 || *p != 0xFF )
- return( POLARSSL_ERR_RSA_INVALID_PADDING );
- p++;
- }
- p++;
- break;
-
- default:
-
- return( POLARSSL_ERR_RSA_INVALID_PADDING );
- }
-
- len = siglen - (int)( p - buf );
-
- if( len == 34 )
- {
- c = p[13];
- p[13] = 0;
-
- if( memcmp( p, ASN1_HASH_MDX, 18 ) != 0 )
- return( POLARSSL_ERR_RSA_VERIFY_FAILED );
-
- if( ( c == 2 && hash_id == SIG_RSA_MD2 ) ||
- ( c == 4 && hash_id == SIG_RSA_MD4 ) ||
- ( c == 5 && hash_id == SIG_RSA_MD5 ) )
- {
- if( memcmp( p + 18, hash, 16 ) == 0 )
- return( 0 );
- else
- return( POLARSSL_ERR_RSA_VERIFY_FAILED );
- }
- }
-
- if( len == 35 && hash_id == SIG_RSA_SHA1 )
- {
- if( memcmp( p, ASN1_HASH_SHA1, 15 ) == 0 &&
- memcmp( p + 15, hash, 20 ) == 0 )
- return( 0 );
- else
- return( POLARSSL_ERR_RSA_VERIFY_FAILED );
- }
- if( ( len == 19 + 28 && p[14] == 4 && hash_id == SIG_RSA_SHA224 ) ||
- ( len == 19 + 32 && p[14] == 1 && hash_id == SIG_RSA_SHA256 ) ||
- ( len == 19 + 48 && p[14] == 2 && hash_id == SIG_RSA_SHA384 ) ||
- ( len == 19 + 64 && p[14] == 3 && hash_id == SIG_RSA_SHA512 ) )
- {
- c = p[1] - 17;
- p[1] = 17;
- p[14] = 0;
-
- if( p[18] == c &&
- memcmp( p, ASN1_HASH_SHA2X, 18 ) == 0 &&
- memcmp( p + 19, hash, c ) == 0 )
- return( 0 );
- else
- return( POLARSSL_ERR_RSA_VERIFY_FAILED );
- }
-
- if( len == hashlen && hash_id == SIG_RSA_RAW )
- {
- if( memcmp( p, hash, hashlen ) == 0 )
- return( 0 );
- else
- return( POLARSSL_ERR_RSA_VERIFY_FAILED );
- }
-
- return( POLARSSL_ERR_RSA_INVALID_PADDING );
-}
-/*
- * Free the components of an RSA key
- */
-void rsa_free( rsa_context *ctx )
+
+/* allocate mem for signature (when signing) */
+/* sign data (gnutls_only)
+OR
+sign hash.
+
+Return: NULL for success, or an error string */
+
+const uschar *
+exim_rsa_sign(es_ctx * sign_ctx, BOOL is_sha1, blob * data, blob * sig)
{
- mpi_free( &ctx->RQ, &ctx->RP, &ctx->RN,
- &ctx->QP, &ctx->DQ, &ctx->DP,
- &ctx->Q, &ctx->P, &ctx->D,
- &ctx->E, &ctx->N, NULL );
+uint len;
+const uschar * ret = NULL;
+
+/* Allocate mem for signature */
+len = RSA_size(sign_ctx->rsa);
+sig->data = store_get(len);
+sig->len = len;
+
+/* Do signing */
+if (RSA_sign(is_sha1 ? NID_sha1 : NID_sha256,
+ CUS data->data, data->len,
+ US sig->data, &len, sign_ctx->rsa) != 1)
+ {
+ char ssl_errstring[256];
+ ERR_load_crypto_strings(); /*XXX move to a startup routine */
+ ERR_error_string(ERR_get_error(), ssl_errstring);
+ ret = string_copy(US ssl_errstring);
+ }
+
+RSA_free(sign_ctx->rsa);
+return ret;;
}
-/* PDKIM code (not copied from polarssl) */
-/*
- * Parse a public RSA key
-
-OpenSSL RSA public key ASN1 container
- 0:d=0 hl=3 l= 159 cons: SEQUENCE
- 3:d=1 hl=2 l= 13 cons: SEQUENCE
- 5:d=2 hl=2 l= 9 prim: OBJECT:rsaEncryption
- 16:d=2 hl=2 l= 0 prim: NULL
- 18:d=1 hl=3 l= 141 prim: BIT STRING:RSAPublicKey (below)
-
-RSAPublicKey ASN1 container
- 0:d=0 hl=3 l= 137 cons: SEQUENCE
- 3:d=1 hl=3 l= 129 prim: INTEGER:Public modulus
-135:d=1 hl=2 l= 3 prim: INTEGER:Public exponent
-*/
-int rsa_parse_public_key( rsa_context *rsa, unsigned char *buf, int buflen )
+/* import public key (from DER in memory)
+Return: nULL for success, or an error string */
+
+const uschar *
+exim_rsa_verify_init(blob * pubkey_der, ev_ctx * verify_ctx)
{
- unsigned char *p, *end;
- int ret, len;
-
- p = buf;
- end = buf+buflen;
-
- if( ( ret = asn1_get_tag( &p, end, &len,
- ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 ) {
- return( POLARSSL_ERR_X509_KEY_INVALID_FORMAT | ret );
- }
-
- if( ( ret = asn1_get_tag( &p, end, &len,
- ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) == 0 ) {
- /* Skip over embedded rsaEncryption Object */
- p+=len;
-
- /* The RSAPublicKey ASN1 container is wrapped in a BIT STRING */
- if( ( ret = asn1_get_tag( &p, end, &len,
- ASN1_BIT_STRING ) ) != 0 ) {
- return( POLARSSL_ERR_X509_KEY_INVALID_FORMAT | ret );
- }
-
- /* Limit range to that BIT STRING */
- end = p + len;
- p++;
-
- if( ( ret = asn1_get_tag( &p, end, &len,
- ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 ) {
- return( POLARSSL_ERR_X509_KEY_INVALID_FORMAT | ret );
- }
- }
-
- if ( ( ( ret = asn1_get_mpi( &p, end, &(rsa->N) ) ) == 0 ) &&
- ( ( ret = asn1_get_mpi( &p, end, &(rsa->E) ) ) == 0 ) ) {
- rsa->len = mpi_size( &rsa->N );
- return 0;
- }
-
- return( POLARSSL_ERR_X509_KEY_INVALID_FORMAT | ret );
+const uschar * p = CUS pubkey_der->data;
+const uschar * ret = NULL;
+
+if (!(verify_ctx->rsa = d2i_RSA_PUBKEY(NULL, &p, (long) pubkey_der->len)))
+ {
+ char ssl_errstring[256];
+ ERR_load_crypto_strings(); /*XXX move to a startup routine */
+ ERR_error_string(ERR_get_error(), ssl_errstring);
+ ret = string_copy(CUS ssl_errstring);
+ }
+return ret;
}
-/*
- * Parse a private RSA key
- */
-int rsa_parse_key( rsa_context *rsa, unsigned char *buf, int buflen,
- unsigned char *pwd, int pwdlen )
+
+
+
+/* verify signature (of hash) (given pubkey & alleged sig)
+Return: NULL for success, or an error string */
+
+const uschar *
+exim_rsa_verify(ev_ctx * verify_ctx, BOOL is_sha1, blob * data_hash, blob * sig)
{
- int ret, len, enc;
- unsigned char *s1, *s2;
- unsigned char *p, *end;
-
- s1 = (unsigned char *) strstr( (char *) buf,
- "-----BEGIN RSA PRIVATE KEY-----" );
-
- if( s1 != NULL )
- {
- s2 = (unsigned char *) strstr( (char *) buf,
- "-----END RSA PRIVATE KEY-----" );
-
- if( s2 == NULL || s2 <= s1 )
- return( POLARSSL_ERR_X509_KEY_INVALID_PEM );
-
- s1 += 31;
- if( *s1 == '\r' ) s1++;
- if( *s1 == '\n' ) s1++;
- else return( POLARSSL_ERR_X509_KEY_INVALID_PEM );
-
- enc = 0;
-
- if( memcmp( s1, "Proc-Type: 4,ENCRYPTED", 22 ) == 0 )
- {
- return( POLARSSL_ERR_X509_FEATURE_UNAVAILABLE );
- }
-
- len = 0;
- ret = base64_decode( NULL, &len, s1, s2 - s1 );
-
- if( ret == POLARSSL_ERR_BASE64_INVALID_CHARACTER )
- return( ret | POLARSSL_ERR_X509_KEY_INVALID_PEM );
-
- if( ( buf = (unsigned char *) malloc( len ) ) == NULL )
- return( 1 );
-
- if( ( ret = base64_decode( buf, &len, s1, s2 - s1 ) ) != 0 )
- {
- free( buf );
- return( ret | POLARSSL_ERR_X509_KEY_INVALID_PEM );
- }
-
- buflen = len;
-
- if( enc != 0 )
- {
- return( POLARSSL_ERR_X509_FEATURE_UNAVAILABLE );
- }
- }
-
- memset( rsa, 0, sizeof( rsa_context ) );
-
- p = buf;
- end = buf + buflen;
-
- /*
- * RSAPrivateKey ::= SEQUENCE {
- * version Version,
- * modulus INTEGER, -- n
- * publicExponent INTEGER, -- e
- * privateExponent INTEGER, -- d
- * prime1 INTEGER, -- p
- * prime2 INTEGER, -- q
- * exponent1 INTEGER, -- d mod (p-1)
- * exponent2 INTEGER, -- d mod (q-1)
- * coefficient INTEGER, -- (inverse of q) mod p
- * otherPrimeInfos OtherPrimeInfos OPTIONAL
- * }
- */
- if( ( ret = asn1_get_tag( &p, end, &len,
- ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
- {
- if( s1 != NULL )
- free( buf );
-
- rsa_free( rsa );
- return( POLARSSL_ERR_X509_KEY_INVALID_FORMAT | ret );
- }
-
- end = p + len;
-
- if( ( ret = asn1_get_int( &p, end, &rsa->ver ) ) != 0 )
- {
- if( s1 != NULL )
- free( buf );
-
- rsa_free( rsa );
- return( POLARSSL_ERR_X509_KEY_INVALID_FORMAT | ret );
- }
-
- if( rsa->ver != 0 )
- {
- if( s1 != NULL )
- free( buf );
-
- rsa_free( rsa );
- return( ret | POLARSSL_ERR_X509_KEY_INVALID_VERSION );
- }
-
- if( ( ret = asn1_get_mpi( &p, end, &rsa->N ) ) != 0 ||
- ( ret = asn1_get_mpi( &p, end, &rsa->E ) ) != 0 ||
- ( ret = asn1_get_mpi( &p, end, &rsa->D ) ) != 0 ||
- ( ret = asn1_get_mpi( &p, end, &rsa->P ) ) != 0 ||
- ( ret = asn1_get_mpi( &p, end, &rsa->Q ) ) != 0 ||
- ( ret = asn1_get_mpi( &p, end, &rsa->DP ) ) != 0 ||
- ( ret = asn1_get_mpi( &p, end, &rsa->DQ ) ) != 0 ||
- ( ret = asn1_get_mpi( &p, end, &rsa->QP ) ) != 0 )
- {
- if( s1 != NULL )
- free( buf );
-
- rsa_free( rsa );
- return( ret | POLARSSL_ERR_X509_KEY_INVALID_FORMAT );
- }
-
- rsa->len = mpi_size( &rsa->N );
-
- if( p != end )
- {
- if( s1 != NULL )
- free( buf );
-
- rsa_free( rsa );
- return( POLARSSL_ERR_X509_KEY_INVALID_FORMAT |
- POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
- }
-
- if( ( ret = rsa_check_privkey( rsa ) ) != 0 )
- {
- if( s1 != NULL )
- free( buf );
-
- rsa_free( rsa );
- return( ret );
- }
-
- if( s1 != NULL )
- free( buf );
-
- return( 0 );
+const uschar * ret = NULL;
+
+if (RSA_verify(is_sha1 ? NID_sha1 : NID_sha256,
+ CUS data_hash->data, data_hash->len,
+ US sig->data, (uint) sig->len, verify_ctx->rsa) != 1)
+ {
+ char ssl_errstring[256];
+ ERR_load_crypto_strings(); /*XXX move to a startup routine */
+ ERR_error_string(ERR_get_error(), ssl_errstring);
+ ret = string_copy(US ssl_errstring);
+ }
+return ret;
}
+
+
+#endif
+/******************************************************************************/
+
+#endif /*DISABLE_DKIM*/
+/* End of File */