+++ /dev/null
-/*
- * The RSA public-key cryptosystem
- *
- * Copyright (C) 2006-2010, Brainspark B.V.
- *
- * 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
- */
-
-#include "rsa.h"
-#include "base64.h"
-
-#include <stdlib.h>
-#include <string.h>
-#include <stdio.h>
-
-/* *************** begin copy from x509parse.c ********************/
-/*
- * ASN.1 DER decoding routines
- */
-static int asn1_get_len( unsigned char **p,
- const 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,
- const 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,
- const 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,
- 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 );
-
- *p += len;
-
- return( ret );
-}
-/* *************** end copy from x509parse.c ********************/
-
-
-
-
-/*
- * Initialize an RSA context
- */
-void rsa_init( rsa_context *ctx,
- int padding,
- int hash_id )
-{
- memset( ctx, 0, sizeof( rsa_context ) );
-
- ctx->padding = padding;
- ctx->hash_id = hash_id;
-}
-
-#if defined(POLARSSL_GENPRIME)
-
-/*
- * 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( f_rng == NULL || nbits < 128 || exponent < 3 )
- return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
-
- mpi_init( &P1, &Q1, &H, &G, NULL );
-
- /*
- * find primes P and Q with Q < P so that:
- * GCD( E, (P-1)*(Q-1) ) == 1
- */
- MPI_CHK( mpi_lset( &ctx->E, exponent ) );
-
- 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;
-
- 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 );
-
- /*
- * 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 ) );
-
- ctx->len = ( mpi_msb( &ctx->N ) + 7 ) >> 3;
-
-cleanup:
-
- mpi_free( &G, &H, &Q1, &P1, NULL );
-
- if( ret != 0 )
- {
- rsa_free( ctx );
- return( POLARSSL_ERR_RSA_KEY_GEN_FAILED | ret );
- }
-
- return( 0 );
-}
-
-#endif
-
-/*
- * Check a public RSA key
- */
-int rsa_check_pubkey( const rsa_context *ctx )
-{
- 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 );
-
- 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( 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 );
-
- 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,
- 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 );
-
- return( 0 );
-}
-
-/*
- * 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:
-
- if( ilen < 0 || olen < ilen + 11 || f_rng == NULL )
- return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
-
- nb_pad = olen - 3 - ilen;
-
- *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 );
-
- // Check if RNG failed to generate data
- //
- if( rng_dl == 0 )
- return POLARSSL_ERR_RSA_RNG_FAILED;
-
- 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,
- const unsigned char *input,
- unsigned char *output,
- int output_max_len)
-{
- int ret, ilen;
- unsigned char *p;
- unsigned char buf[1024];
-
- 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_TOO_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,
- const 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 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 ) );
-}
-
-/*
- * 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 )
-{
- 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 );
-}
-
-
-/* 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 )
-{
- 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 );
-}
HCoop / hcoop / debian / exim4.git / blobdiff