X-Git-Url: https://git.hcoop.net/hcoop/debian/exim4.git/blobdiff_plain/188b6fee0dfdf699a1a302e16b70d17b4f325bcd..2ea97746a3f65eeffb434b8e4e18815e03b61532:/src/pdkim/rsa.c diff --git a/src/pdkim/rsa.c b/src/pdkim/rsa.c deleted file mode 100644 index 68b201d..0000000 --- a/src/pdkim/rsa.c +++ /dev/null @@ -1,957 +0,0 @@ -/* - * 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 - * - * 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 -#include -#include - -/* *************** 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 ); -}