--- /dev/null
+/*
+ * The RSA public-key cryptosystem
+ *
+ * Based on XySSL: Copyright (C) 2006-2008 Christophe Devine
+ *
+ * Copyright (C) 2009 Paul Bakker <polarssl_maintainer at polarssl dot org>
+ *
+ * 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
+ */
+
+/* $Cambridge: exim/src/src/pdkim/rsa.c,v 1.2 2009/06/10 07:34:05 tom Exp $ */
+
+#include "rsa.h"
+#include "base64.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+
+
+/*
+ * ASN.1 DER decoding routines
+ */
+static int asn1_get_len( unsigned char **p,
+ unsigned char *end,
+ int *len )
+{
+ 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,
+ unsigned char *end,
+ int *len, int tag )
+{
+ if( ( end - *p ) < 1 )
+ return( POLARSSL_ERR_ASN1_OUT_OF_DATA );
+
+ if( **p != tag )
+ return( POLARSSL_ERR_ASN1_UNEXPECTED_TAG );
+
+ (*p)++;
+
+ return( asn1_get_len( p, end, len ) );
+}
+
+static int asn1_get_int( unsigned char **p,
+ unsigned char *end,
+ int *val )
+{
+ int ret, len;
+
+ if( ( ret = asn1_get_tag( p, end, &len, ASN1_INTEGER ) ) != 0 )
+ return( ret );
+
+ if( len > (int) sizeof( int ) || ( **p & 0x80 ) != 0 )
+ return( POLARSSL_ERR_ASN1_INVALID_LENGTH );
+
+ *val = 0;
+
+ while( len-- > 0 )
+ {
+ *val = ( *val << 8 ) | **p;
+ (*p)++;
+ }
+
+ return( 0 );
+}
+
+static int asn1_get_mpi( unsigned char **p,
+ 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 );
+
+ *p += len;
+
+ return( ret );
+}
+
+
+/*
+ * Initialize an RSA context
+ */
+void rsa_init( rsa_context *ctx,
+ int padding,
+ int hash_id,
+ int (*f_rng)(void *),
+ void *p_rng )
+{
+ memset( ctx, 0, sizeof( rsa_context ) );
+
+ ctx->padding = padding;
+ ctx->hash_id = hash_id;
+
+ ctx->f_rng = f_rng;
+ ctx->p_rng = p_rng;
+}
+
+
+/*
+ * Check a public RSA key
+ */
+int rsa_check_pubkey( rsa_context *ctx )
+{
+ if( ( ctx->N.p[0] & 1 ) == 0 ||
+ ( ctx->E.p[0] & 1 ) == 0 )
+ return( POLARSSL_ERR_RSA_KEY_CHECK_FAILED );
+
+ if( mpi_msb( &ctx->N ) < 128 ||
+ mpi_msb( &ctx->N ) > 4096 )
+ return( POLARSSL_ERR_RSA_KEY_CHECK_FAILED );
+
+ if( mpi_msb( &ctx->E ) < 2 ||
+ mpi_msb( &ctx->E ) > 64 )
+ return( POLARSSL_ERR_RSA_KEY_CHECK_FAILED );
+
+ return( 0 );
+}
+
+/*
+ * Check a private RSA key
+ */
+int rsa_check_privkey( rsa_context *ctx )
+{
+ int ret;
+ mpi PQ, DE, P1, Q1, H, I, G;
+
+ if( ( ret = rsa_check_pubkey( ctx ) ) != 0 )
+ return( ret );
+
+ mpi_init( &PQ, &DE, &P1, &Q1, &H, &I, &G, 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_mod_mpi( &I, &DE, &H ) );
+ MPI_CHK( mpi_gcd( &G, &ctx->E, &H ) );
+
+ if( mpi_cmp_mpi( &PQ, &ctx->N ) == 0 &&
+ mpi_cmp_int( &I, 1 ) == 0 &&
+ mpi_cmp_int( &G, 1 ) == 0 )
+ {
+ mpi_free( &G, &I, &H, &Q1, &P1, &DE, &PQ, NULL );
+ return( 0 );
+ }
+
+cleanup:
+
+ mpi_free( &G, &I, &H, &Q1, &P1, &DE, &PQ, NULL );
+ return( POLARSSL_ERR_RSA_KEY_CHECK_FAILED | ret );
+}
+
+/*
+ * Do an RSA public key operation
+ */
+int rsa_public( rsa_context *ctx,
+ unsigned char *input,
+ unsigned char *output )
+{
+ int ret, olen;
+ mpi T;
+
+ mpi_init( &T, 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 );
+ }
+
+ olen = ctx->len;
+ MPI_CHK( mpi_exp_mod( &T, &T, &ctx->E, &ctx->N, &ctx->RN ) );
+ MPI_CHK( mpi_write_binary( &T, output, olen ) );
+
+cleanup:
+
+ mpi_free( &T, NULL );
+
+ if( ret != 0 )
+ return( POLARSSL_ERR_RSA_PUBLIC_FAILED | ret );
+
+ return( 0 );
+}
+
+/*
+ * Do an RSA private key operation
+ */
+int rsa_private( rsa_context *ctx,
+ 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 );
+
+ return( 0 );
+}
+
+/*
+ * Add the message padding, then do an RSA operation
+ */
+int rsa_pkcs1_encrypt( rsa_context *ctx,
+ int mode, int ilen,
+ unsigned char *input,
+ unsigned char *output )
+{
+ int nb_pad, olen;
+ unsigned char *p = output;
+
+ olen = ctx->len;
+
+ switch( ctx->padding )
+ {
+ case RSA_PKCS_V15:
+
+ if( ilen < 0 || olen < ilen + 11 )
+ return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
+
+ nb_pad = olen - 3 - ilen;
+
+ *p++ = 0;
+ *p++ = RSA_CRYPT;
+
+ while( nb_pad-- > 0 )
+ {
+ do {
+ *p = (unsigned char) rand();
+ } while( *p == 0 );
+ p++;
+ }
+ *p++ = 0;
+ memcpy( p, input, ilen );
+ break;
+
+ default:
+
+ return( POLARSSL_ERR_RSA_INVALID_PADDING );
+ }
+
+ return( ( mode == RSA_PUBLIC )
+ ? rsa_public( ctx, output, output )
+ : rsa_private( ctx, output, output ) );
+}
+
+/*
+ * Do an RSA operation, then remove the message padding
+ */
+int rsa_pkcs1_decrypt( rsa_context *ctx,
+ int mode, int *olen,
+ unsigned char *input,
+ unsigned char *output,
+ int output_max_len)
+{
+ int ret, ilen;
+ unsigned char *p;
+ unsigned char buf[512];
+
+ ilen = ctx->len;
+
+ 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 );
+
+ if( ret != 0 )
+ return( ret );
+
+ 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;
+
+ default:
+
+ return( POLARSSL_ERR_RSA_INVALID_PADDING );
+ }
+
+ if (ilen - (int)(p - buf) > output_max_len)
+ return( POLARSSL_ERR_RSA_OUTPUT_TO_LARGE );
+
+ *olen = ilen - (int)(p - buf);
+ memcpy( output, p, *olen );
+
+ return( 0 );
+}
+
+/*
+ * Do an RSA operation to sign the message digest
+ */
+int rsa_pkcs1_sign( rsa_context *ctx,
+ int mode,
+ int hash_id,
+ int hashlen,
+ unsigned char *hash,
+ unsigned char *sig )
+{
+ int nb_pad, olen;
+ unsigned char *p = sig;
+
+ olen = ctx->len;
+
+ switch( ctx->padding )
+ {
+ case RSA_PKCS_V15:
+
+ switch( hash_id )
+ {
+ case RSA_RAW:
+ nb_pad = olen - 3 - hashlen;
+ break;
+
+ case RSA_MD2:
+ case RSA_MD4:
+ case RSA_MD5:
+ nb_pad = olen - 3 - 16 - 18;
+ break;
+
+ case RSA_SHA1:
+ nb_pad = olen - 3 - 20 - 15;
+ break;
+
+ case RSA_SHA256:
+ nb_pad = olen - 3 - 32 - 19;
+ 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 RSA_RAW:
+ memcpy( p, hash, hashlen );
+ break;
+
+ case RSA_MD2:
+ memcpy( p, ASN1_HASH_MDX, 18 );
+ memcpy( p + 18, hash, 16 );
+ p[13] = 2; break;
+
+ case RSA_MD4:
+ memcpy( p, ASN1_HASH_MDX, 18 );
+ memcpy( p + 18, hash, 16 );
+ p[13] = 4; break;
+
+ case RSA_MD5:
+ memcpy( p, ASN1_HASH_MDX, 18 );
+ memcpy( p + 18, hash, 16 );
+ p[13] = 5; break;
+
+ case RSA_SHA1:
+ memcpy( p, ASN1_HASH_SHA1, 15 );
+ memcpy( p + 15, hash, 20 );
+ break;
+
+ case RSA_SHA256:
+ memcpy( p, ASN1_HASH_SHA256, 19 );
+ memcpy( p + 19, hash, 32 );
+ break;
+
+ default:
+ return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
+ }
+
+ return( ( mode == RSA_PUBLIC )
+ ? rsa_public( ctx, sig, sig )
+ : rsa_private( ctx, sig, sig ) );
+}
+
+/*
+ * Do an RSA operation and check the message digest
+ */
+int rsa_pkcs1_verify( rsa_context *ctx,
+ int mode,
+ int hash_id,
+ int hashlen,
+ unsigned char *hash,
+ unsigned char *sig )
+{
+ int ret, len, siglen;
+ unsigned char *p, c;
+ unsigned char buf[512];
+
+ 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 == RSA_MD2 ) ||
+ ( c == 4 && hash_id == RSA_MD4 ) ||
+ ( c == 5 && hash_id == RSA_MD5 ) )
+ {
+ if( memcmp( p + 18, hash, 16 ) == 0 )
+ return( 0 );
+ else
+ return( POLARSSL_ERR_RSA_VERIFY_FAILED );
+ }
+ }
+
+ if( len == 35 && hash_id == 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 == 51 && hash_id == RSA_SHA256 )
+ {
+ if( memcmp( p, ASN1_HASH_SHA256, 19 ) == 0 &&
+ memcmp( p + 19, hash, 32 ) == 0 )
+ return( 0 );
+ else
+ return( POLARSSL_ERR_RSA_VERIFY_FAILED );
+ }
+
+ if( len == hashlen && hash_id == 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 )
+{
+ 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 );
+}
+
+
+/*
+ * 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 )
+{
+ 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 );
+}
+
+/*
+ * Parse a private RSA key
+ */
+int rsa_parse_key( rsa_context *rsa, unsigned char *buf, int buflen,
+ unsigned char *pwd, int pwdlen )
+{
+ 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 );
+}
git://git.exim.org / users / jgh / exim.git / blobdiff