+++ /dev/null
-/*
- * The RSA public-key cryptosystem
- *
- * Copyright (C) 2006-2011, 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 "polarssl_config.h"
-
-#if defined(POLARSSL_RSA_C)
-
-#include "rsa.h"
-
-#if defined(POLARSSL_PKCS1_V21)
-#include "md.h"
-#endif
-
-#include <stdlib.h>
-#include <stdio.h>
-
-/*
- * 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 *, unsigned char *, size_t),
- void *p_rng,
- unsigned 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 ); mpi_init( &Q1 ); mpi_init( &H ); mpi_init( &G );
-
- /*
- * 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( &P1 ); mpi_free( &Q1 ); mpi_free( &H ); mpi_free( &G );
-
- 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 ) > POLARSSL_MPI_MAX_BITS )
- 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, DP, DQ, QP;
-
- 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 ); mpi_init( &DE ); mpi_init( &P1 ); mpi_init( &Q1 );
- mpi_init( &H ); mpi_init( &I ); mpi_init( &G ); mpi_init( &G2 );
- mpi_init( &L1 ); mpi_init( &L2 ); mpi_init( &DP ); mpi_init( &DQ );
- mpi_init( &QP );
-
- 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 ) );
-
- MPI_CHK( mpi_mod_mpi( &DP, &ctx->D, &P1 ) );
- MPI_CHK( mpi_mod_mpi( &DQ, &ctx->D, &Q1 ) );
- MPI_CHK( mpi_inv_mod( &QP, &ctx->Q, &ctx->P ) );
- /*
- * Check for a valid PKCS1v2 private key
- */
- if( mpi_cmp_mpi( &PQ, &ctx->N ) != 0 ||
- mpi_cmp_mpi( &DP, &ctx->DP ) != 0 ||
- mpi_cmp_mpi( &DQ, &ctx->DQ ) != 0 ||
- mpi_cmp_mpi( &QP, &ctx->QP ) != 0 ||
- mpi_cmp_int( &L2, 0 ) != 0 ||
- mpi_cmp_int( &I, 1 ) != 0 ||
- mpi_cmp_int( &G, 1 ) != 0 )
- {
- ret = POLARSSL_ERR_RSA_KEY_CHECK_FAILED;
- }
-
-cleanup:
- mpi_free( &PQ ); mpi_free( &DE ); mpi_free( &P1 ); mpi_free( &Q1 );
- mpi_free( &H ); mpi_free( &I ); mpi_free( &G ); mpi_free( &G2 );
- mpi_free( &L1 ); mpi_free( &L2 ); mpi_free( &DP ); mpi_free( &DQ );
- mpi_free( &QP );
-
- if( ret == POLARSSL_ERR_RSA_KEY_CHECK_FAILED )
- return( ret );
-
- if( ret != 0 )
- return( POLARSSL_ERR_RSA_KEY_CHECK_FAILED + ret );
-
- return( 0 );
-}
-
-/*
- * Do an RSA public key operation
- */
-int rsa_public( rsa_context *ctx,
- const unsigned char *input,
- unsigned char *output )
-{
- int ret;
- size_t olen;
- mpi T;
-
- mpi_init( &T );
-
- MPI_CHK( mpi_read_binary( &T, input, ctx->len ) );
-
- if( mpi_cmp_mpi( &T, &ctx->N ) >= 0 )
- {
- mpi_free( &T );
- 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 );
-
- 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;
- size_t olen;
- mpi T, T1, T2;
-
- mpi_init( &T ); mpi_init( &T1 ); mpi_init( &T2 );
-
- MPI_CHK( mpi_read_binary( &T, input, ctx->len ) );
-
- if( mpi_cmp_mpi( &T, &ctx->N ) >= 0 )
- {
- mpi_free( &T );
- return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
- }
-
-#if defined(POLARSSL_RSA_NO_CRT)
- 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 ); mpi_free( &T1 ); mpi_free( &T2 );
-
- if( ret != 0 )
- return( POLARSSL_ERR_RSA_PRIVATE_FAILED + ret );
-
- return( 0 );
-}
-
-#if defined(POLARSSL_PKCS1_V21)
-/**
- * Generate and apply the MGF1 operation (from PKCS#1 v2.1) to a buffer.
- *
- * \param dst buffer to mask
- * \param dlen length of destination buffer
- * \param src source of the mask generation
- * \param slen length of the source buffer
- * \param md_ctx message digest context to use
- */
-static void mgf_mask( unsigned char *dst, size_t dlen, unsigned char *src, size_t slen,
- md_context_t *md_ctx )
-{
- unsigned char mask[POLARSSL_MD_MAX_SIZE];
- unsigned char counter[4];
- unsigned char *p;
- unsigned int hlen;
- size_t i, use_len;
-
- memset( mask, 0, POLARSSL_MD_MAX_SIZE );
- memset( counter, 0, 4 );
-
- hlen = md_ctx->md_info->size;
-
- // Generate and apply dbMask
- //
- p = dst;
-
- while( dlen > 0 )
- {
- use_len = hlen;
- if( dlen < hlen )
- use_len = dlen;
-
- md_starts( md_ctx );
- md_update( md_ctx, src, slen );
- md_update( md_ctx, counter, 4 );
- md_finish( md_ctx, mask );
-
- for( i = 0; i < use_len; ++i )
- *p++ ^= mask[i];
-
- counter[3]++;
-
- dlen -= use_len;
- }
-}
-#endif
-
-#if defined(POLARSSL_PKCS1_V21)
-/*
- * Implementation of the PKCS#1 v2.1 RSAES-OAEP-ENCRYPT function
- */
-int rsa_rsaes_oaep_encrypt( rsa_context *ctx,
- int (*f_rng)(void *, unsigned char *, size_t),
- void *p_rng,
- int mode,
- const unsigned char *label, size_t label_len,
- size_t ilen,
- const unsigned char *input,
- unsigned char *output )
-{
- size_t olen;
- int ret;
- unsigned char *p = output;
- unsigned int hlen;
- const md_info_t *md_info;
- md_context_t md_ctx;
-
- if( ctx->padding != RSA_PKCS_V21 || f_rng == NULL )
- return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
-
- md_info = md_info_from_type( ctx->hash_id );
-
- if( md_info == NULL )
- return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
-
- olen = ctx->len;
- hlen = md_get_size( md_info );
-
- if( olen < ilen + 2 * hlen + 2 || f_rng == NULL )
- return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
-
- memset( output, 0, olen );
-
- *p++ = 0;
-
- // Generate a random octet string seed
- //
- if( ( ret = f_rng( p_rng, p, hlen ) ) != 0 )
- return( POLARSSL_ERR_RSA_RNG_FAILED + ret );
-
- p += hlen;
-
- // Construct DB
- //
- md( md_info, label, label_len, p );
- p += hlen;
- p += olen - 2 * hlen - 2 - ilen;
- *p++ = 1;
- memcpy( p, input, ilen );
-
- md_init_ctx( &md_ctx, md_info );
-
- // maskedDB: Apply dbMask to DB
- //
- mgf_mask( output + hlen + 1, olen - hlen - 1, output + 1, hlen,
- &md_ctx );
-
- // maskedSeed: Apply seedMask to seed
- //
- mgf_mask( output + 1, hlen, output + hlen + 1, olen - hlen - 1,
- &md_ctx );
-
- md_free_ctx( &md_ctx );
-
- return( ( mode == RSA_PUBLIC )
- ? rsa_public( ctx, output, output )
- : rsa_private( ctx, output, output ) );
-}
-#endif /* POLARSSL_PKCS1_V21 */
-
-/*
- * Implementation of the PKCS#1 v2.1 RSAES-PKCS1-V1_5-ENCRYPT function
- */
-int rsa_rsaes_pkcs1_v15_encrypt( rsa_context *ctx,
- int (*f_rng)(void *, unsigned char *, size_t),
- void *p_rng,
- int mode, size_t ilen,
- const unsigned char *input,
- unsigned char *output )
-{
- size_t nb_pad, olen;
- int ret;
- unsigned char *p = output;
-
- if( ctx->padding != RSA_PKCS_V15 || f_rng == NULL )
- return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
-
- olen = ctx->len;
-
- if( olen < ilen + 11 )
- return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
-
- nb_pad = olen - 3 - ilen;
-
- *p++ = 0;
- if( mode == RSA_PUBLIC )
- {
- *p++ = RSA_CRYPT;
-
- while( nb_pad-- > 0 )
- {
- int rng_dl = 100;
-
- do {
- ret = f_rng( p_rng, p, 1 );
- } while( *p == 0 && --rng_dl && ret == 0 );
-
- // Check if RNG failed to generate data
- //
- if( rng_dl == 0 || ret != 0)
- return POLARSSL_ERR_RSA_RNG_FAILED + ret;
-
- p++;
- }
- }
- else
- {
- *p++ = RSA_SIGN;
-
- while( nb_pad-- > 0 )
- *p++ = 0xFF;
- }
-
- *p++ = 0;
- memcpy( p, input, ilen );
-
- return( ( mode == RSA_PUBLIC )
- ? rsa_public( ctx, output, output )
- : rsa_private( ctx, output, output ) );
-}
-
-/*
- * Add the message padding, then do an RSA operation
- */
-int rsa_pkcs1_encrypt( rsa_context *ctx,
- int (*f_rng)(void *, unsigned char *, size_t),
- void *p_rng,
- int mode, size_t ilen,
- const unsigned char *input,
- unsigned char *output )
-{
- switch( ctx->padding )
- {
- case RSA_PKCS_V15:
- return rsa_rsaes_pkcs1_v15_encrypt( ctx, f_rng, p_rng, mode, ilen,
- input, output );
-
-#if defined(POLARSSL_PKCS1_V21)
- case RSA_PKCS_V21:
- return rsa_rsaes_oaep_encrypt( ctx, f_rng, p_rng, mode, NULL, 0,
- ilen, input, output );
-#endif
-
- default:
- return( POLARSSL_ERR_RSA_INVALID_PADDING );
- }
-}
-
-#if defined(POLARSSL_PKCS1_V21)
-/*
- * Implementation of the PKCS#1 v2.1 RSAES-OAEP-DECRYPT function
- */
-int rsa_rsaes_oaep_decrypt( rsa_context *ctx,
- int mode,
- const unsigned char *label, size_t label_len,
- size_t *olen,
- const unsigned char *input,
- unsigned char *output,
- size_t output_max_len )
-{
- int ret;
- size_t ilen;
- unsigned char *p;
- unsigned char buf[POLARSSL_MPI_MAX_SIZE];
- unsigned char lhash[POLARSSL_MD_MAX_SIZE];
- unsigned int hlen;
- const md_info_t *md_info;
- md_context_t md_ctx;
-
- if( ctx->padding != RSA_PKCS_V21 )
- return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
-
- ilen = ctx->len;
-
- if( ilen < 16 || ilen > 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;
-
- if( *p++ != 0 )
- return( POLARSSL_ERR_RSA_INVALID_PADDING );
-
- md_info = md_info_from_type( ctx->hash_id );
- if( md_info == NULL )
- return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
-
- hlen = md_get_size( md_info );
-
- md_init_ctx( &md_ctx, md_info );
-
- // Generate lHash
- //
- md( md_info, label, label_len, lhash );
-
- // seed: Apply seedMask to maskedSeed
- //
- mgf_mask( buf + 1, hlen, buf + hlen + 1, ilen - hlen - 1,
- &md_ctx );
-
- // DB: Apply dbMask to maskedDB
- //
- mgf_mask( buf + hlen + 1, ilen - hlen - 1, buf + 1, hlen,
- &md_ctx );
-
- p += hlen;
- md_free_ctx( &md_ctx );
-
- // Check validity
- //
- if( memcmp( lhash, p, hlen ) != 0 )
- return( POLARSSL_ERR_RSA_INVALID_PADDING );
-
- p += hlen;
-
- while( *p == 0 && p < buf + ilen )
- p++;
-
- if( p == buf + ilen )
- return( POLARSSL_ERR_RSA_INVALID_PADDING );
-
- if( *p++ != 0x01 )
- return( POLARSSL_ERR_RSA_INVALID_PADDING );
-
- if (ilen - (p - buf) > output_max_len)
- return( POLARSSL_ERR_RSA_OUTPUT_TOO_LARGE );
-
- *olen = ilen - (p - buf);
- memcpy( output, p, *olen );
-
- return( 0 );
-}
-#endif /* POLARSSL_PKCS1_V21 */
-
-/*
- * Implementation of the PKCS#1 v2.1 RSAES-PKCS1-V1_5-DECRYPT function
- */
-int rsa_rsaes_pkcs1_v15_decrypt( rsa_context *ctx,
- int mode, size_t *olen,
- const unsigned char *input,
- unsigned char *output,
- size_t output_max_len)
-{
- int ret, correct = 1;
- size_t ilen, pad_count = 0;
- unsigned char *p, *q;
- unsigned char bt;
- unsigned char buf[POLARSSL_MPI_MAX_SIZE];
-
- if( ctx->padding != RSA_PKCS_V15 )
- return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
-
- ilen = ctx->len;
-
- if( ilen < 16 || ilen > 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;
-
- if( *p++ != 0 )
- correct = 0;
-
- bt = *p++;
- if( ( bt != RSA_CRYPT && mode == RSA_PRIVATE ) ||
- ( bt != RSA_SIGN && mode == RSA_PUBLIC ) )
- {
- correct = 0;
- }
-
- if( bt == RSA_CRYPT )
- {
- while( *p != 0 && p < buf + ilen - 1 )
- pad_count += ( *p++ != 0 );
-
- correct &= ( *p == 0 && p < buf + ilen - 1 );
-
- q = p;
-
- // Also pass over all other bytes to reduce timing differences
- //
- while ( q < buf + ilen - 1 )
- pad_count += ( *q++ != 0 );
-
- // Prevent compiler optimization of pad_count
- //
- correct |= pad_count & 0x100000; /* Always 0 unless 1M bit keys */
- p++;
- }
- else
- {
- while( *p == 0xFF && p < buf + ilen - 1 )
- pad_count += ( *p++ == 0xFF );
-
- correct &= ( *p == 0 && p < buf + ilen - 1 );
-
- q = p;
-
- // Also pass over all other bytes to reduce timing differences
- //
- while ( q < buf + ilen - 1 )
- pad_count += ( *q++ != 0 );
-
- // Prevent compiler optimization of pad_count
- //
- correct |= pad_count & 0x100000; /* Always 0 unless 1M bit keys */
- p++;
- }
-
- if( correct == 0 )
- return( POLARSSL_ERR_RSA_INVALID_PADDING );
-
- if (ilen - (p - buf) > output_max_len)
- return( POLARSSL_ERR_RSA_OUTPUT_TOO_LARGE );
-
- *olen = ilen - (p - buf);
- memcpy( output, p, *olen );
-
- return( 0 );
-}
-
-/*
- * Do an RSA operation, then remove the message padding
- */
-int rsa_pkcs1_decrypt( rsa_context *ctx,
- int mode, size_t *olen,
- const unsigned char *input,
- unsigned char *output,
- size_t output_max_len)
-{
- switch( ctx->padding )
- {
- case RSA_PKCS_V15:
- return rsa_rsaes_pkcs1_v15_decrypt( ctx, mode, olen, input, output,
- output_max_len );
-
-#if defined(POLARSSL_PKCS1_V21)
- case RSA_PKCS_V21:
- return rsa_rsaes_oaep_decrypt( ctx, mode, NULL, 0, olen, input,
- output, output_max_len );
-#endif
-
- default:
- return( POLARSSL_ERR_RSA_INVALID_PADDING );
- }
-}
-
-#if defined(POLARSSL_PKCS1_V21)
-/*
- * Implementation of the PKCS#1 v2.1 RSASSA-PSS-SIGN function
- */
-int rsa_rsassa_pss_sign( rsa_context *ctx,
- int (*f_rng)(void *, unsigned char *, size_t),
- void *p_rng,
- int mode,
- int hash_id,
- unsigned int hashlen,
- const unsigned char *hash,
- unsigned char *sig )
-{
- size_t olen;
- unsigned char *p = sig;
- unsigned char salt[POLARSSL_MD_MAX_SIZE];
- unsigned int slen, hlen, offset = 0;
- int ret;
- size_t msb;
- const md_info_t *md_info;
- md_context_t md_ctx;
-
- if( ctx->padding != RSA_PKCS_V21 || f_rng == NULL )
- return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
-
- olen = ctx->len;
-
- switch( hash_id )
- {
- case SIG_RSA_MD2:
- case SIG_RSA_MD4:
- case SIG_RSA_MD5:
- hashlen = 16;
- break;
-
- case SIG_RSA_SHA1:
- hashlen = 20;
- break;
-
- case SIG_RSA_SHA224:
- hashlen = 28;
- break;
-
- case SIG_RSA_SHA256:
- hashlen = 32;
- break;
-
- case SIG_RSA_SHA384:
- hashlen = 48;
- break;
-
- case SIG_RSA_SHA512:
- hashlen = 64;
- break;
-
- default:
- return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
- }
-
- md_info = md_info_from_type( ctx->hash_id );
- if( md_info == NULL )
- return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
-
- hlen = md_get_size( md_info );
- slen = hlen;
-
- if( olen < hlen + slen + 2 )
- return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
-
- memset( sig, 0, olen );
-
- msb = mpi_msb( &ctx->N ) - 1;
-
- // Generate salt of length slen
- //
- if( ( ret = f_rng( p_rng, salt, slen ) ) != 0 )
- return( POLARSSL_ERR_RSA_RNG_FAILED + ret );
-
- // Note: EMSA-PSS encoding is over the length of N - 1 bits
- //
- msb = mpi_msb( &ctx->N ) - 1;
- p += olen - hlen * 2 - 2;
- *p++ = 0x01;
- memcpy( p, salt, slen );
- p += slen;
-
- md_init_ctx( &md_ctx, md_info );
-
- // Generate H = Hash( M' )
- //
- md_starts( &md_ctx );
- md_update( &md_ctx, p, 8 );
- md_update( &md_ctx, hash, hashlen );
- md_update( &md_ctx, salt, slen );
- md_finish( &md_ctx, p );
-
- // Compensate for boundary condition when applying mask
- //
- if( msb % 8 == 0 )
- offset = 1;
-
- // maskedDB: Apply dbMask to DB
- //
- mgf_mask( sig + offset, olen - hlen - 1 - offset, p, hlen, &md_ctx );
-
- md_free_ctx( &md_ctx );
-
- msb = mpi_msb( &ctx->N ) - 1;
- sig[0] &= 0xFF >> ( olen * 8 - msb );
-
- p += hlen;
- *p++ = 0xBC;
-
- return( ( mode == RSA_PUBLIC )
- ? rsa_public( ctx, sig, sig )
- : rsa_private( ctx, sig, sig ) );
-}
-#endif /* POLARSSL_PKCS1_V21 */
-
-/*
- * Implementation of the PKCS#1 v2.1 RSASSA-PKCS1-V1_5-SIGN function
- */
-/*
- * Do an RSA operation to sign the message digest
- */
-int rsa_rsassa_pkcs1_v15_sign( rsa_context *ctx,
- int mode,
- int hash_id,
- unsigned int hashlen,
- const unsigned char *hash,
- unsigned char *sig )
-{
- size_t nb_pad, olen;
- unsigned char *p = sig;
-
- if( ctx->padding != RSA_PKCS_V15 )
- return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
-
- olen = ctx->len;
-
- 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 ) || ( nb_pad > olen ) )
- return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
-
- *p++ = 0;
- *p++ = RSA_SIGN;
- memset( p, 0xFF, nb_pad );
- p += nb_pad;
- *p++ = 0;
-
- 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 to sign the message digest
- */
-int rsa_pkcs1_sign( rsa_context *ctx,
- int (*f_rng)(void *, unsigned char *, size_t),
- void *p_rng,
- int mode,
- int hash_id,
- unsigned int hashlen,
- const unsigned char *hash,
- unsigned char *sig )
-{
- switch( ctx->padding )
- {
- case RSA_PKCS_V15:
- return rsa_rsassa_pkcs1_v15_sign( ctx, mode, hash_id,
- hashlen, hash, sig );
-
-#if defined(POLARSSL_PKCS1_V21)
- case RSA_PKCS_V21:
- return rsa_rsassa_pss_sign( ctx, f_rng, p_rng, mode, hash_id,
- hashlen, hash, sig );
-#endif
-
- default:
- return( POLARSSL_ERR_RSA_INVALID_PADDING );
- }
-}
-
-#if defined(POLARSSL_PKCS1_V21)
-/*
- * Implementation of the PKCS#1 v2.1 RSASSA-PSS-VERIFY function
- */
-int rsa_rsassa_pss_verify( rsa_context *ctx,
- int mode,
- int hash_id,
- unsigned int hashlen,
- const unsigned char *hash,
- unsigned char *sig )
-{
- int ret;
- size_t siglen;
- unsigned char *p;
- unsigned char buf[POLARSSL_MPI_MAX_SIZE];
- unsigned char result[POLARSSL_MD_MAX_SIZE];
- unsigned char zeros[8];
- unsigned int hlen;
- size_t slen, msb;
- const md_info_t *md_info;
- md_context_t md_ctx;
-
- if( ctx->padding != RSA_PKCS_V21 )
- return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
-
- siglen = ctx->len;
-
- if( siglen < 16 || siglen > 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;
-
- if( buf[siglen - 1] != 0xBC )
- return( POLARSSL_ERR_RSA_INVALID_PADDING );
-
- switch( hash_id )
- {
- case SIG_RSA_MD2:
- case SIG_RSA_MD4:
- case SIG_RSA_MD5:
- hashlen = 16;
- break;
-
- case SIG_RSA_SHA1:
- hashlen = 20;
- break;
-
- case SIG_RSA_SHA224:
- hashlen = 28;
- break;
-
- case SIG_RSA_SHA256:
- hashlen = 32;
- break;
-
- case SIG_RSA_SHA384:
- hashlen = 48;
- break;
-
- case SIG_RSA_SHA512:
- hashlen = 64;
- break;
-
- default:
- return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
- }
-
- md_info = md_info_from_type( ctx->hash_id );
- if( md_info == NULL )
- return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
-
- hlen = md_get_size( md_info );
- slen = siglen - hlen - 1;
-
- memset( zeros, 0, 8 );
-
- // Note: EMSA-PSS verification is over the length of N - 1 bits
- //
- msb = mpi_msb( &ctx->N ) - 1;
-
- // Compensate for boundary condition when applying mask
- //
- if( msb % 8 == 0 )
- {
- p++;
- siglen -= 1;
- }
- if( buf[0] >> ( 8 - siglen * 8 + msb ) )
- return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
-
- md_init_ctx( &md_ctx, md_info );
-
- mgf_mask( p, siglen - hlen - 1, p + siglen - hlen - 1, hlen, &md_ctx );
-
- buf[0] &= 0xFF >> ( siglen * 8 - msb );
-
- while( *p == 0 && p < buf + siglen )
- p++;
-
- if( p == buf + siglen ||
- *p++ != 0x01 )
- {
- md_free_ctx( &md_ctx );
- return( POLARSSL_ERR_RSA_INVALID_PADDING );
- }
-
- slen -= p - buf;
-
- // Generate H = Hash( M' )
- //
- md_starts( &md_ctx );
- md_update( &md_ctx, zeros, 8 );
- md_update( &md_ctx, hash, hashlen );
- md_update( &md_ctx, p, slen );
- md_finish( &md_ctx, result );
-
- md_free_ctx( &md_ctx );
-
- if( memcmp( p + slen, result, hlen ) == 0 )
- return( 0 );
- else
- return( POLARSSL_ERR_RSA_VERIFY_FAILED );
-}
-#endif /* POLARSSL_PKCS1_V21 */
-
-/*
- * Implementation of the PKCS#1 v2.1 RSASSA-PKCS1-v1_5-VERIFY function
- */
-int rsa_rsassa_pkcs1_v15_verify( rsa_context *ctx,
- int mode,
- int hash_id,
- unsigned int hashlen,
- const unsigned char *hash,
- unsigned char *sig )
-{
- int ret;
- size_t len, siglen;
- unsigned char *p, c;
- unsigned char buf[POLARSSL_MPI_MAX_SIZE];
-
- if( ctx->padding != RSA_PKCS_V15 )
- return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
-
- siglen = ctx->len;
-
- if( siglen < 16 || siglen > 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;
-
- 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++;
-
- len = siglen - ( p - buf );
-
- if( len == 33 && hash_id == SIG_RSA_SHA1 )
- {
- if( memcmp( p, ASN1_HASH_SHA1_ALT, 13 ) == 0 &&
- memcmp( p + 13, hash, 20 ) == 0 )
- return( 0 );
- else
- return( POLARSSL_ERR_RSA_VERIFY_FAILED );
- }
- 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 );
-}
-
-/*
- * Do an RSA operation and check the message digest
- */
-int rsa_pkcs1_verify( rsa_context *ctx,
- int mode,
- int hash_id,
- unsigned int hashlen,
- const unsigned char *hash,
- unsigned char *sig )
-{
- switch( ctx->padding )
- {
- case RSA_PKCS_V15:
- return rsa_rsassa_pkcs1_v15_verify( ctx, mode, hash_id,
- hashlen, hash, sig );
-
-#if defined(POLARSSL_PKCS1_V21)
- case RSA_PKCS_V21:
- return rsa_rsassa_pss_verify( ctx, mode, hash_id,
- hashlen, hash, sig );
-#endif
-
- default:
- return( POLARSSL_ERR_RSA_INVALID_PADDING );
- }
-}
-
-/*
- * Free the components of an RSA key
- */
-void rsa_free( rsa_context *ctx )
-{
- mpi_free( &ctx->RQ ); mpi_free( &ctx->RP ); mpi_free( &ctx->RN );
- mpi_free( &ctx->QP ); mpi_free( &ctx->DQ ); mpi_free( &ctx->DP );
- mpi_free( &ctx->Q ); mpi_free( &ctx->P ); mpi_free( &ctx->D );
- mpi_free( &ctx->E ); mpi_free( &ctx->N );
-}
-
-#if defined(POLARSSL_SELF_TEST)
-
-#include "polarssl/sha1.h"
-
-/*
- * Example RSA-1024 keypair, for test purposes
- */
-#define KEY_LEN 128
-
-#define RSA_N "9292758453063D803DD603D5E777D788" \
- "8ED1D5BF35786190FA2F23EBC0848AEA" \
- "DDA92CA6C3D80B32C4D109BE0F36D6AE" \
- "7130B9CED7ACDF54CFC7555AC14EEBAB" \
- "93A89813FBF3C4F8066D2D800F7C38A8" \
- "1AE31942917403FF4946B0A83D3D3E05" \
- "EE57C6F5F5606FB5D4BC6CD34EE0801A" \
- "5E94BB77B07507233A0BC7BAC8F90F79"
-
-#define RSA_E "10001"
-
-#define RSA_D "24BF6185468786FDD303083D25E64EFC" \
- "66CA472BC44D253102F8B4A9D3BFA750" \
- "91386C0077937FE33FA3252D28855837" \
- "AE1B484A8A9A45F7EE8C0C634F99E8CD" \
- "DF79C5CE07EE72C7F123142198164234" \
- "CABB724CF78B8173B9F880FC86322407" \
- "AF1FEDFDDE2BEB674CA15F3E81A1521E" \
- "071513A1E85B5DFA031F21ECAE91A34D"
-
-#define RSA_P "C36D0EB7FCD285223CFB5AABA5BDA3D8" \
- "2C01CAD19EA484A87EA4377637E75500" \
- "FCB2005C5C7DD6EC4AC023CDA285D796" \
- "C3D9E75E1EFC42488BB4F1D13AC30A57"
-
-#define RSA_Q "C000DF51A7C77AE8D7C7370C1FF55B69" \
- "E211C2B9E5DB1ED0BF61D0D9899620F4" \
- "910E4168387E3C30AA1E00C339A79508" \
- "8452DD96A9A5EA5D9DCA68DA636032AF"
-
-#define RSA_DP "C1ACF567564274FB07A0BBAD5D26E298" \
- "3C94D22288ACD763FD8E5600ED4A702D" \
- "F84198A5F06C2E72236AE490C93F07F8" \
- "3CC559CD27BC2D1CA488811730BB5725"
-
-#define RSA_DQ "4959CBF6F8FEF750AEE6977C155579C7" \
- "D8AAEA56749EA28623272E4F7D0592AF" \
- "7C1F1313CAC9471B5C523BFE592F517B" \
- "407A1BD76C164B93DA2D32A383E58357"
-
-#define RSA_QP "9AE7FBC99546432DF71896FC239EADAE" \
- "F38D18D2B2F0E2DD275AA977E2BF4411" \
- "F5A3B2A5D33605AEBBCCBA7FEB9F2D2F" \
- "A74206CEC169D74BF5A8C50D6F48EA08"
-
-#define PT_LEN 24
-#define RSA_PT "\xAA\xBB\xCC\x03\x02\x01\x00\xFF\xFF\xFF\xFF\xFF" \
- "\x11\x22\x33\x0A\x0B\x0C\xCC\xDD\xDD\xDD\xDD\xDD"
-
-static int myrand( void *rng_state, unsigned char *output, size_t len )
-{
- size_t i;
-
- if( rng_state != NULL )
- rng_state = NULL;
-
- for( i = 0; i < len; ++i )
- output[i] = rand();
-
- return( 0 );
-}
-
-/*
- * Checkup routine
- */
-int rsa_self_test( int verbose )
-{
- size_t len;
- rsa_context rsa;
- unsigned char rsa_plaintext[PT_LEN];
- unsigned char rsa_decrypted[PT_LEN];
- unsigned char rsa_ciphertext[KEY_LEN];
-#if defined(POLARSSL_SHA1_C)
- unsigned char sha1sum[20];
-#endif
-
- rsa_init( &rsa, RSA_PKCS_V15, 0 );
-
- rsa.len = KEY_LEN;
- mpi_read_string( &rsa.N , 16, RSA_N );
- mpi_read_string( &rsa.E , 16, RSA_E );
- mpi_read_string( &rsa.D , 16, RSA_D );
- mpi_read_string( &rsa.P , 16, RSA_P );
- mpi_read_string( &rsa.Q , 16, RSA_Q );
- mpi_read_string( &rsa.DP, 16, RSA_DP );
- mpi_read_string( &rsa.DQ, 16, RSA_DQ );
- mpi_read_string( &rsa.QP, 16, RSA_QP );
-
- if( verbose != 0 )
- printf( " RSA key validation: " );
-
- if( rsa_check_pubkey( &rsa ) != 0 ||
- rsa_check_privkey( &rsa ) != 0 )
- {
- if( verbose != 0 )
- printf( "failed\n" );
-
- return( 1 );
- }
-
- if( verbose != 0 )
- printf( "passed\n PKCS#1 encryption : " );
-
- memcpy( rsa_plaintext, RSA_PT, PT_LEN );
-
- if( rsa_pkcs1_encrypt( &rsa, &myrand, NULL, RSA_PUBLIC, PT_LEN,
- rsa_plaintext, rsa_ciphertext ) != 0 )
- {
- if( verbose != 0 )
- printf( "failed\n" );
-
- return( 1 );
- }
-
- if( verbose != 0 )
- printf( "passed\n PKCS#1 decryption : " );
-
- if( rsa_pkcs1_decrypt( &rsa, RSA_PRIVATE, &len,
- rsa_ciphertext, rsa_decrypted,
- sizeof(rsa_decrypted) ) != 0 )
- {
- if( verbose != 0 )
- printf( "failed\n" );
-
- return( 1 );
- }
-
- if( memcmp( rsa_decrypted, rsa_plaintext, len ) != 0 )
- {
- if( verbose != 0 )
- printf( "failed\n" );
-
- return( 1 );
- }
-
-#if defined(POLARSSL_SHA1_C)
- if( verbose != 0 )
- printf( "passed\n PKCS#1 data sign : " );
-
- sha1( rsa_plaintext, PT_LEN, sha1sum );
-
- if( rsa_pkcs1_sign( &rsa, NULL, NULL, RSA_PRIVATE, SIG_RSA_SHA1, 20,
- sha1sum, rsa_ciphertext ) != 0 )
- {
- if( verbose != 0 )
- printf( "failed\n" );
-
- return( 1 );
- }
-
- if( verbose != 0 )
- printf( "passed\n PKCS#1 sig. verify: " );
-
- if( rsa_pkcs1_verify( &rsa, RSA_PUBLIC, SIG_RSA_SHA1, 20,
- sha1sum, rsa_ciphertext ) != 0 )
- {
- if( verbose != 0 )
- printf( "failed\n" );
-
- return( 1 );
- }
-
- if( verbose != 0 )
- printf( "passed\n\n" );
-#endif /* POLARSSL_SHA1_C */
-
- rsa_free( &rsa );
-
- return( 0 );
-}
-
-#endif
-
-#endif
projects / proxmark3-svn / blobdiff