diff options
Diffstat (limited to 'crypto/rsa/rsa_gen.c')
| -rw-r--r-- | crypto/rsa/rsa_gen.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/crypto/rsa/rsa_gen.c b/crypto/rsa/rsa_gen.c new file mode 100644 index 0000000000..0cab3a5d73 --- /dev/null +++ b/crypto/rsa/rsa_gen.c @@ -0,0 +1,186 @@ +/* crypto/rsa/rsa_gen.c */ +/* Copyright (C) 1995-1997 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 <time.h> +#include "cryptlib.h" +#include "bn.h" +#include "rsa.h" + +RSA *RSA_generate_key(bits, e_value, callback) +int bits; +unsigned long e_value; +void (*callback)(P_I_I); + { + RSA *rsa=NULL; + BIGNUM *r0=NULL,*r1=NULL,*r2=NULL,*r3=NULL,*tmp; + int bitsp,bitsq,ok= -1,n=0; + BN_CTX *ctx=NULL,*ctx2=NULL; + + ctx=BN_CTX_new(); + if (ctx == NULL) goto err; + ctx2=BN_CTX_new(); + if (ctx2 == NULL) goto err; + r0=ctx->bn[0]; + r1=ctx->bn[1]; + r2=ctx->bn[2]; + r3=ctx->bn[3]; + ctx->tos+=4; + + bitsp=(bits+1)/2; + bitsq=bits-bitsp; + rsa=RSA_new(); + if (rsa == NULL) goto err; + + /* set e */ + rsa->e=BN_new(); + if (rsa->e == NULL) goto err; + if (!BN_set_word(rsa->e,e_value)) goto err; + + /* generate p and q */ + for (;;) + { + rsa->p=BN_generate_prime(bitsp,0,NULL,NULL,callback); + if (rsa->p == NULL) goto err; + if (!BN_sub(r2,rsa->p,BN_value_one())) goto err; + if (!BN_gcd(r1,r2,rsa->e,ctx)) goto err; + if (BN_is_one(r1)) break; + if (callback != NULL) callback(2,n++); + BN_free(rsa->p); + } + if (callback != NULL) callback(3,0); + for (;;) + { + rsa->q=BN_generate_prime(bitsq,0,NULL,NULL,callback); + if (rsa->q == NULL) goto err; + if (!BN_sub(r2,rsa->q,BN_value_one())) goto err; + if (!BN_gcd(r1,r2,rsa->e,ctx)) goto err; + if (BN_is_one(r1) && (BN_cmp(rsa->p,rsa->q) != 0)) + break; + if (callback != NULL) callback(2,n++); + BN_free(rsa->q); + } + if (callback != NULL) callback(3,1); + if (BN_cmp(rsa->p,rsa->q) < 0) + { + tmp=rsa->p; + rsa->p=rsa->q; + rsa->q=tmp; + } + + /* calculate n */ + rsa->n=BN_new(); + if (rsa->n == NULL) goto err; + if (!BN_mul(rsa->n,rsa->p,rsa->q)) goto err; + + /* calculate d */ + if (!BN_sub(r1,rsa->p,BN_value_one())) goto err; /* p-1 */ + if (!BN_sub(r2,rsa->q,BN_value_one())) goto err; /* q-1 */ + if (!BN_mul(r0,r1,r2)) goto err; /* (p-1)(q-1) */ + +/* should not be needed, since gcd(p-1,e) == 1 and gcd(q-1,e) == 1 */ +/* for (;;) + { + if (!BN_gcd(r3,r0,rsa->e,ctx)) goto err; + if (BN_is_one(r3)) break; + + if (1) + { + if (!BN_add_word(rsa->e,2L)) goto err; + continue; + } + RSAerr(RSA_F_RSA_GENERATE_KEY,RSA_R_BAD_E_VALUE); + goto err; + } +*/ + rsa->d=(BIGNUM *)BN_mod_inverse(rsa->e,r0,ctx2); /* d */ + if (rsa->d == NULL) goto err; + + /* calculate d mod (p-1) */ + rsa->dmp1=BN_new(); + if (rsa->dmp1 == NULL) goto err; + if (!BN_mod(rsa->dmp1,rsa->d,r1,ctx)) goto err; + + /* calculate d mod (q-1) */ + rsa->dmq1=BN_new(); + if (rsa->dmq1 == NULL) goto err; + if (!BN_mod(rsa->dmq1,rsa->d,r2,ctx)) goto err; + + /* calculate inverse of q mod p */ + rsa->iqmp=BN_mod_inverse(rsa->q,rsa->p,ctx2); + if (rsa->iqmp == NULL) goto err; + + ok=1; +err: + if (ok == -1) + { + RSAerr(RSA_F_RSA_GENERATE_KEY,ERR_LIB_BN); + ok=0; + } + BN_CTX_free(ctx); + BN_CTX_free(ctx2); + + if (!ok) + { + if (rsa != NULL) RSA_free(rsa); + return(NULL); + } + else + return(rsa); + } + |