diff options
Diffstat (limited to 'crypto/rsa/rsa_eay.c')
| -rw-r--r-- | crypto/rsa/rsa_eay.c | 498 |
1 files changed, 498 insertions, 0 deletions
diff --git a/crypto/rsa/rsa_eay.c b/crypto/rsa/rsa_eay.c new file mode 100644 index 0000000000..00f8ea9341 --- /dev/null +++ b/crypto/rsa/rsa_eay.c @@ -0,0 +1,498 @@ +/* crypto/rsa/rsa_eay.c */ +/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) + * All rights reserved. + * + * This package is an SSL implementation written + * by Eric Young (eay@cryptsoft.com). + * The implementation was written so as to conform with Netscapes SSL. + * + * This library is free for commercial and non-commercial use as long as + * the following conditions are aheared to. The following conditions + * apply to all code found in this distribution, be it the RC4, RSA, + * lhash, DES, etc., code; not just the SSL code. The SSL documentation + * included with this distribution is covered by the same copyright terms + * except that the holder is Tim Hudson (tjh@cryptsoft.com). + * + * Copyright remains Eric Young's, and as such any Copyright notices in + * the code are not to be removed. + * If this package is used in a product, Eric Young should be given attribution + * as the author of the parts of the library used. + * This can be in the form of a textual message at program startup or + * in documentation (online or textual) provided with the package. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * "This product includes cryptographic software written by + * Eric Young (eay@cryptsoft.com)" + * The word 'cryptographic' can be left out if the rouines from the library + * being used are not cryptographic related :-). + * 4. If you include any Windows specific code (or a derivative thereof) from + * the apps directory (application code) you must include an acknowledgement: + * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" + * + * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * The licence and distribution terms for any publically available version or + * derivative of this code cannot be changed. i.e. this code cannot simply be + * copied and put under another distribution licence + * [including the GNU Public Licence.] + */ + +#include <stdio.h> +#include "cryptlib.h" +#include "bn.h" +#include "rsa.h" +#include "rand.h" + +#ifndef NOPROTO +static int RSA_eay_public_encrypt(int flen, unsigned char *from, + unsigned char *to, RSA *rsa,int padding); +static int RSA_eay_private_encrypt(int flen, unsigned char *from, + unsigned char *to, RSA *rsa,int padding); +static int RSA_eay_public_decrypt(int flen, unsigned char *from, + unsigned char *to, RSA *rsa,int padding); +static int RSA_eay_private_decrypt(int flen, unsigned char *from, + unsigned char *to, RSA *rsa,int padding); +static int RSA_eay_mod_exp(BIGNUM *r0, BIGNUM *i, RSA *rsa); +static int RSA_eay_init(RSA *rsa); +static int RSA_eay_finish(RSA *rsa); +#else +static int RSA_eay_public_encrypt(); +static int RSA_eay_private_encrypt(); +static int RSA_eay_public_decrypt(); +static int RSA_eay_private_decrypt(); +static int RSA_eay_mod_exp(); +static int RSA_eay_init(); +static int RSA_eay_finish(); +#endif + +static RSA_METHOD rsa_pkcs1_eay_meth={ + "Eric Young's PKCS#1 RSA", + RSA_eay_public_encrypt, + RSA_eay_public_decrypt, + RSA_eay_private_encrypt, + RSA_eay_private_decrypt, + RSA_eay_mod_exp, + BN_mod_exp_mont, + RSA_eay_init, + RSA_eay_finish, + 0, + NULL, + }; + +RSA_METHOD *RSA_PKCS1_SSLeay() + { + return(&rsa_pkcs1_eay_meth); + } + +static int RSA_eay_public_encrypt(flen, from, to, rsa, padding) +int flen; +unsigned char *from; +unsigned char *to; +RSA *rsa; +int padding; + { + BIGNUM *f=NULL,*ret=NULL; + int i,j,k,num=0,r= -1; + unsigned char *buf=NULL; + BN_CTX *ctx=NULL; + + if ((ctx=BN_CTX_new()) == NULL) goto err; + num=BN_num_bytes(rsa->n); + if ((buf=(unsigned char *)Malloc(num)) == NULL) + { + RSAerr(RSA_F_RSA_EAY_PUBLIC_ENCRYPT,ERR_R_MALLOC_FAILURE); + goto err; + } + + switch (padding) + { + case RSA_PKCS1_PADDING: + i=RSA_padding_add_PKCS1_type_2(buf,num,from,flen); + break; + case RSA_SSLV23_PADDING: + i=RSA_padding_add_SSLv23(buf,num,from,flen); + break; + case RSA_NO_PADDING: + i=RSA_padding_add_none(buf,num,from,flen); + break; + default: + RSAerr(RSA_F_RSA_EAY_PUBLIC_ENCRYPT,RSA_R_UNKNOWN_PADDING_TYPE); + goto err; + } + if (i <= 0) goto err; + + if (((f=BN_new()) == NULL) || ((ret=BN_new()) == NULL)) goto err; + + if (BN_bin2bn(buf,num,f) == NULL) goto err; + + if ((rsa->method_mod_n == NULL) && (rsa->flags & RSA_FLAG_CACHE_PUBLIC)) + { + if ((rsa->method_mod_n=(char *)BN_MONT_CTX_new()) != NULL) + if (!BN_MONT_CTX_set((BN_MONT_CTX *)rsa->method_mod_n, + rsa->n,ctx)) goto err; + } + + if (!rsa->meth->bn_mod_exp(ret,f,rsa->e,rsa->n,ctx, + rsa->method_mod_n)) goto err; + + /* put in leading 0 bytes if the number is less than the + * length of the modulus */ + j=BN_num_bytes(ret); + i=BN_bn2bin(ret,&(to[num-j])); + for (k=0; k<(num-i); k++) + to[k]=0; + + r=num; +err: + if (ctx != NULL) BN_CTX_free(ctx); + if (f != NULL) BN_free(f); + if (ret != NULL) BN_free(ret); + if (buf != NULL) + { + memset(buf,0,num); + Free(buf); + } + return(r); + } + +static int RSA_eay_private_encrypt(flen, from, to, rsa, padding) +int flen; +unsigned char *from; +unsigned char *to; +RSA *rsa; +int padding; + { + BIGNUM *f=NULL,*ret=NULL; + int i,j,k,num=0,r= -1; + unsigned char *buf=NULL; + BN_CTX *ctx=NULL; + + if ((ctx=BN_CTX_new()) == NULL) goto err; + num=BN_num_bytes(rsa->n); + if ((buf=(unsigned char *)Malloc(num)) == NULL) + { + RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,ERR_R_MALLOC_FAILURE); + goto err; + } + + switch (padding) + { + case RSA_PKCS1_PADDING: + i=RSA_padding_add_PKCS1_type_1(buf,num,from,flen); + break; + case RSA_NO_PADDING: + i=RSA_padding_add_none(buf,num,from,flen); + break; + case RSA_SSLV23_PADDING: + default: + RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,RSA_R_UNKNOWN_PADDING_TYPE); + goto err; + } + if (i <= 0) goto err; + + if (((f=BN_new()) == NULL) || ((ret=BN_new()) == NULL)) goto err; + if (BN_bin2bn(buf,num,f) == NULL) goto err; + + if ((rsa->flags & RSA_FLAG_BLINDING) && (rsa->blinding == NULL)) + RSA_blinding_on(rsa,ctx); + if (rsa->flags & RSA_FLAG_BLINDING) + if (!BN_BLINDING_convert(f,rsa->blinding,ctx)) goto err; + + if ( (rsa->p != NULL) && + (rsa->q != NULL) && + (rsa->dmp1 != NULL) && + (rsa->dmq1 != NULL) && + (rsa->iqmp != NULL)) + { if (!rsa->meth->rsa_mod_exp(ret,f,rsa)) goto err; } + else + { + if (!rsa->meth->bn_mod_exp(ret,f,rsa->d,rsa->n,ctx)) goto err; + } + + if (rsa->flags & RSA_FLAG_BLINDING) + if (!BN_BLINDING_invert(ret,rsa->blinding,ctx)) goto err; + + /* put in leading 0 bytes if the number is less than the + * length of the modulus */ + j=BN_num_bytes(ret); + i=BN_bn2bin(ret,&(to[num-j])); + for (k=0; k<(num-i); k++) + to[k]=0; + + r=num; +err: + if (ctx != NULL) BN_CTX_free(ctx); + if (ret != NULL) BN_free(ret); + if (f != NULL) BN_free(f); + if (buf != NULL) + { + memset(buf,0,num); + Free(buf); + } + return(r); + } + +static int RSA_eay_private_decrypt(flen, from, to, rsa,padding) +int flen; +unsigned char *from; +unsigned char *to; +RSA *rsa; +int padding; + { + BIGNUM *f=NULL,*ret=NULL; + int j,num=0,r= -1; + unsigned char *p; + unsigned char *buf=NULL; + BN_CTX *ctx=NULL; + + ctx=BN_CTX_new(); + if (ctx == NULL) goto err; + + num=BN_num_bytes(rsa->n); + + if ((buf=(unsigned char *)Malloc(num)) == NULL) + { + RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,ERR_R_MALLOC_FAILURE); + goto err; + } + + /* This check was for equallity but PGP does evil things + * and chops off the top '0' bytes */ + if (flen > num) + { + RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,RSA_R_DATA_GREATER_THAN_MOD_LEN); + goto err; + } + + /* make data into a big number */ + if (((ret=BN_new()) == NULL) || ((f=BN_new()) == NULL)) goto err; + if (BN_bin2bn(from,(int)flen,f) == NULL) goto err; + + if ((rsa->flags & RSA_FLAG_BLINDING) && (rsa->blinding == NULL)) + RSA_blinding_on(rsa,ctx); + if (rsa->flags & RSA_FLAG_BLINDING) + if (!BN_BLINDING_convert(f,rsa->blinding,ctx)) goto err; + + /* do the decrypt */ + if ( (rsa->p != NULL) && + (rsa->q != NULL) && + (rsa->dmp1 != NULL) && + (rsa->dmq1 != NULL) && + (rsa->iqmp != NULL)) + { if (!rsa->meth->rsa_mod_exp(ret,f,rsa)) goto err; } + else + { + if (!rsa->meth->bn_mod_exp(ret,f,rsa->d,rsa->n,ctx)) + goto err; + } + + if (rsa->flags & RSA_FLAG_BLINDING) + if (!BN_BLINDING_invert(ret,rsa->blinding,ctx)) goto err; + + p=buf; + j=BN_bn2bin(ret,p); /* j is only used with no-padding mode */ + + switch (padding) + { + case RSA_PKCS1_PADDING: + r=RSA_padding_check_PKCS1_type_2(to,num,buf,j); + break; + case RSA_SSLV23_PADDING: + r=RSA_padding_check_SSLv23(to,num,buf,j); + break; + case RSA_NO_PADDING: + r=RSA_padding_check_none(to,num,buf,j); + break; + default: + RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,RSA_R_UNKNOWN_PADDING_TYPE); + goto err; + } + if (r < 0) + RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,RSA_R_PADDING_CHECK_FAILED); + +err: + if (ctx != NULL) BN_CTX_free(ctx); + if (f != NULL) BN_free(f); + if (ret != NULL) BN_free(ret); + if (buf != NULL) + { + memset(buf,0,num); + Free(buf); + } + return(r); + } + +static int RSA_eay_public_decrypt(flen, from, to, rsa, padding) +int flen; +unsigned char *from; +unsigned char *to; +RSA *rsa; +int padding; + { + BIGNUM *f=NULL,*ret=NULL; + int i,num=0,r= -1; + unsigned char *p; + unsigned char *buf=NULL; + BN_CTX *ctx=NULL; + + ctx=BN_CTX_new(); + if (ctx == NULL) goto err; + + num=BN_num_bytes(rsa->n); + buf=(unsigned char *)Malloc(num); + if (buf == NULL) + { + RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,ERR_R_MALLOC_FAILURE); + goto err; + } + + /* This check was for equallity but PGP does evil things + * and chops off the top '0' bytes */ + if (flen > num) + { + RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,RSA_R_DATA_GREATER_THAN_MOD_LEN); + goto err; + } + + /* make data into a big number */ + if (((ret=BN_new()) == NULL) || ((f=BN_new()) == NULL)) goto err; + + if (BN_bin2bn(from,flen,f) == NULL) goto err; + /* do the decrypt */ + if ((rsa->method_mod_n == NULL) && (rsa->flags & RSA_FLAG_CACHE_PUBLIC)) + { + if ((rsa->method_mod_n=(char *)BN_MONT_CTX_new()) != NULL) + if (!BN_MONT_CTX_set((BN_MONT_CTX *)rsa->method_mod_n, + rsa->n,ctx)) goto err; + } + + if (!rsa->meth->bn_mod_exp(ret,f,rsa->e,rsa->n,ctx, + rsa->method_mod_n)) goto err; + + p=buf; + i=BN_bn2bin(ret,p); + + switch (padding) + { + case RSA_PKCS1_PADDING: + r=RSA_padding_check_PKCS1_type_1(to,num,buf,i); + break; + case RSA_NO_PADDING: + r=RSA_padding_check_none(to,num,buf,i); + break; + default: + RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,RSA_R_UNKNOWN_PADDING_TYPE); + goto err; + } + if (r < 0) + RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,RSA_R_PADDING_CHECK_FAILED); + +err: + if (ctx != NULL) BN_CTX_free(ctx); + if (f != NULL) BN_free(f); + if (ret != NULL) BN_free(ret); + if (buf != NULL) + { + memset(buf,0,num); + Free(buf); + } + return(r); + } + +static int RSA_eay_mod_exp(r0, I, rsa) +BIGNUM *r0; +BIGNUM *I; +RSA *rsa; + { + BIGNUM *r1=NULL,*m1=NULL; + int ret=0; + BN_CTX *ctx; + + if ((ctx=BN_CTX_new()) == NULL) goto err; + m1=BN_new(); + r1=BN_new(); + if ((m1 == NULL) || (r1 == NULL)) goto err; + + if (rsa->flags & RSA_FLAG_CACHE_PRIVATE) + { + if (rsa->method_mod_p == NULL) + { + if ((rsa->method_mod_p=(char *) + BN_MONT_CTX_new()) != NULL) + if (!BN_MONT_CTX_set((BN_MONT_CTX *) + rsa->method_mod_p,rsa->p,ctx)) + goto err; + } + if (rsa->method_mod_q == NULL) + { + if ((rsa->method_mod_q=(char *) + BN_MONT_CTX_new()) != NULL) + if (!BN_MONT_CTX_set((BN_MONT_CTX *) + rsa->method_mod_q,rsa->q,ctx)) + goto err; + } + } + + if (!BN_mod(r1,I,rsa->q,ctx)) goto err; + if (!rsa->meth->bn_mod_exp(m1,r1,rsa->dmq1,rsa->q,ctx, + rsa->method_mod_q)) goto err; + + if (!BN_mod(r1,I,rsa->p,ctx)) goto err; + if (!rsa->meth->bn_mod_exp(r0,r1,rsa->dmp1,rsa->p,ctx, + rsa->method_mod_p)) goto err; + + if (!BN_add(r1,r0,rsa->p)) goto err; + if (!BN_sub(r0,r1,m1)) goto err; + + if (!BN_mul(r1,r0,rsa->iqmp)) goto err; + if (!BN_mod(r0,r1,rsa->p,ctx)) goto err; + if (!BN_mul(r1,r0,rsa->q)) goto err; + if (!BN_add(r0,r1,m1)) goto err; + + ret=1; +err: + if (m1 != NULL) BN_free(m1); + if (r1 != NULL) BN_free(r1); + BN_CTX_free(ctx); + return(ret); + } + +static int RSA_eay_init(rsa) +RSA *rsa; + { + rsa->flags|=RSA_FLAG_CACHE_PUBLIC|RSA_FLAG_CACHE_PRIVATE; + return(1); + } + +static int RSA_eay_finish(rsa) +RSA *rsa; + { + if (rsa->method_mod_n != NULL) + BN_MONT_CTX_free((BN_MONT_CTX *)rsa->method_mod_n); + if (rsa->method_mod_p != NULL) + BN_MONT_CTX_free((BN_MONT_CTX *)rsa->method_mod_p); + if (rsa->method_mod_q != NULL) + BN_MONT_CTX_free((BN_MONT_CTX *)rsa->method_mod_q); + return(1); + } + + |