diff options
Diffstat (limited to 'openssl/crypto/dh/dh_check.c')
| -rw-r--r-- | openssl/crypto/dh/dh_check.c | 139 |
1 files changed, 72 insertions, 67 deletions
diff --git a/openssl/crypto/dh/dh_check.c b/openssl/crypto/dh/dh_check.c index 066898174..c39ed97ba 100644 --- a/openssl/crypto/dh/dh_check.c +++ b/openssl/crypto/dh/dh_check.c @@ -5,21 +5,21 @@ * 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: @@ -34,10 +34,10 @@ * 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 + * 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 @@ -49,7 +49,7 @@ * 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 @@ -61,7 +61,8 @@ #include <openssl/bn.h> #include <openssl/dh.h> -/* Check that p is a safe prime and +/*- + * Check that p is a safe prime and * if g is 2, 3 or 5, check that it is a suitable generator * where * for 2, p mod 24 == 11 @@ -71,72 +72,76 @@ */ int DH_check(const DH *dh, int *ret) - { - int ok=0; - BN_CTX *ctx=NULL; - BN_ULONG l; - BIGNUM *q=NULL; +{ + int ok = 0; + BN_CTX *ctx = NULL; + BN_ULONG l; + BIGNUM *q = NULL; - *ret=0; - ctx=BN_CTX_new(); - if (ctx == NULL) goto err; - q=BN_new(); - if (q == NULL) goto err; + *ret = 0; + ctx = BN_CTX_new(); + if (ctx == NULL) + goto err; + q = BN_new(); + if (q == NULL) + goto err; - if (BN_is_word(dh->g,DH_GENERATOR_2)) - { - l=BN_mod_word(dh->p,24); - if (l != 11) *ret|=DH_NOT_SUITABLE_GENERATOR; - } + if (BN_is_word(dh->g, DH_GENERATOR_2)) { + l = BN_mod_word(dh->p, 24); + if (l != 11) + *ret |= DH_NOT_SUITABLE_GENERATOR; + } #if 0 - else if (BN_is_word(dh->g,DH_GENERATOR_3)) - { - l=BN_mod_word(dh->p,12); - if (l != 5) *ret|=DH_NOT_SUITABLE_GENERATOR; - } + else if (BN_is_word(dh->g, DH_GENERATOR_3)) { + l = BN_mod_word(dh->p, 12); + if (l != 5) + *ret |= DH_NOT_SUITABLE_GENERATOR; + } #endif - else if (BN_is_word(dh->g,DH_GENERATOR_5)) - { - l=BN_mod_word(dh->p,10); - if ((l != 3) && (l != 7)) - *ret|=DH_NOT_SUITABLE_GENERATOR; - } - else - *ret|=DH_UNABLE_TO_CHECK_GENERATOR; + else if (BN_is_word(dh->g, DH_GENERATOR_5)) { + l = BN_mod_word(dh->p, 10); + if ((l != 3) && (l != 7)) + *ret |= DH_NOT_SUITABLE_GENERATOR; + } else + *ret |= DH_UNABLE_TO_CHECK_GENERATOR; - if (!BN_is_prime_ex(dh->p,BN_prime_checks,ctx,NULL)) - *ret|=DH_CHECK_P_NOT_PRIME; - else - { - if (!BN_rshift1(q,dh->p)) goto err; - if (!BN_is_prime_ex(q,BN_prime_checks,ctx,NULL)) - *ret|=DH_CHECK_P_NOT_SAFE_PRIME; - } - ok=1; -err: - if (ctx != NULL) BN_CTX_free(ctx); - if (q != NULL) BN_free(q); - return(ok); - } + if (!BN_is_prime_ex(dh->p, BN_prime_checks, ctx, NULL)) + *ret |= DH_CHECK_P_NOT_PRIME; + else { + if (!BN_rshift1(q, dh->p)) + goto err; + if (!BN_is_prime_ex(q, BN_prime_checks, ctx, NULL)) + *ret |= DH_CHECK_P_NOT_SAFE_PRIME; + } + ok = 1; + err: + if (ctx != NULL) + BN_CTX_free(ctx); + if (q != NULL) + BN_free(q); + return (ok); +} int DH_check_pub_key(const DH *dh, const BIGNUM *pub_key, int *ret) - { - int ok=0; - BIGNUM *q=NULL; +{ + int ok = 0; + BIGNUM *q = NULL; - *ret=0; - q=BN_new(); - if (q == NULL) goto err; - BN_set_word(q,1); - if (BN_cmp(pub_key,q)<=0) - *ret|=DH_CHECK_PUBKEY_TOO_SMALL; - BN_copy(q,dh->p); - BN_sub_word(q,1); - if (BN_cmp(pub_key,q)>=0) - *ret|=DH_CHECK_PUBKEY_TOO_LARGE; + *ret = 0; + q = BN_new(); + if (q == NULL) + goto err; + BN_set_word(q, 1); + if (BN_cmp(pub_key, q) <= 0) + *ret |= DH_CHECK_PUBKEY_TOO_SMALL; + BN_copy(q, dh->p); + BN_sub_word(q, 1); + if (BN_cmp(pub_key, q) >= 0) + *ret |= DH_CHECK_PUBKEY_TOO_LARGE; - ok = 1; -err: - if (q != NULL) BN_free(q); - return(ok); - } + ok = 1; + err: + if (q != NULL) + BN_free(q); + return (ok); +} |