crypto/dsa/dsa_asn1.c

   1 /* crypto/dsa/dsa_asn1.c */
   2
   3 #include <stdio.h>
   4 #include "cryptlib.h"
   5 #include <openssl/dsa.h>
   6 #include <openssl/asn1.h>
   7 #include <openssl/asn1_mac.h>
   8
   9 DSA_SIG *DSA_SIG_new(void)
  10 {
  11         DSA_SIG *ret;
  12
  13         ret = OPENSSL_malloc(sizeof(DSA_SIG));
  14         if (ret == NULL)
  15                 {
  16                 DSAerr(DSA_F_DSA_SIG_NEW,ERR_R_MALLOC_FAILURE);
  17                 return(NULL);
  18                 }
  19         ret->r = NULL;
  20         ret->s = NULL;
  21         return(ret);
  22 }
  23
  24 void DSA_SIG_free(DSA_SIG *r)
  25 {
  26         if (r == NULL) return;
  27         if (r->r) BN_clear_free(r->r);
  28         if (r->s) BN_clear_free(r->s);
  29         OPENSSL_free(r);
  30 }
  31
  32 int i2d_DSA_SIG(const DSA_SIG *v, unsigned char **pp)
  33 {
  34         int t=0,len;
  35         ASN1_INTEGER rbs,sbs;
  36         unsigned char *p;
  37
  38         rbs.data=OPENSSL_malloc(BN_num_bits(v->r)/8+1);
  39         if (rbs.data == NULL)
  40                 {
  41                 DSAerr(DSA_F_I2D_DSA_SIG, ERR_R_MALLOC_FAILURE);
  42                 return(0);
  43                 }
  44         rbs.type=V_ASN1_INTEGER;
  45         rbs.length=BN_bn2bin(v->r,rbs.data);
  46         sbs.data=OPENSSL_malloc(BN_num_bits(v->s)/8+1);
  47         if (sbs.data == NULL)
  48                 {
  49                 OPENSSL_free(rbs.data);
  50                 DSAerr(DSA_F_I2D_DSA_SIG, ERR_R_MALLOC_FAILURE);
  51                 return(0);
  52                 }
  53         sbs.type=V_ASN1_INTEGER;
  54         sbs.length=BN_bn2bin(v->s,sbs.data);
  55
  56         len=i2d_ASN1_INTEGER(&rbs,NULL);
  57         len+=i2d_ASN1_INTEGER(&sbs,NULL);
  58
  59         if (pp)
  60                 {
  61                 p=*pp;
  62                 ASN1_put_object(&p,1,len,V_ASN1_SEQUENCE,V_ASN1_UNIVERSAL);
  63                 i2d_ASN1_INTEGER(&rbs,&p);
  64                 i2d_ASN1_INTEGER(&sbs,&p);
  65                 }
  66         t=ASN1_object_size(1,len,V_ASN1_SEQUENCE);
  67         OPENSSL_free(rbs.data);
  68         OPENSSL_free(sbs.data);
  69         return(t);
  70 }
  71
  72 DSA_SIG *d2i_DSA_SIG(DSA_SIG **a, const unsigned char **pp, long length)
  73 {
  74         int i=ERR_R_NESTED_ASN1_ERROR;
  75         ASN1_INTEGER *bs=NULL;
  76         M_ASN1_D2I_vars(a,DSA_SIG *,DSA_SIG_new);
  77
  78         M_ASN1_D2I_Init();
  79         M_ASN1_D2I_start_sequence();
  80         M_ASN1_D2I_get(bs,d2i_ASN1_INTEGER);
  81         if ((ret->r=BN_bin2bn(bs->data,bs->length,ret->r)) == NULL)
  82                 goto err_bn;
  83         M_ASN1_D2I_get(bs,d2i_ASN1_INTEGER);
  84         if ((ret->s=BN_bin2bn(bs->data,bs->length,ret->s)) == NULL)
  85                 goto err_bn;
  86         M_ASN1_BIT_STRING_free(bs);
  87         M_ASN1_D2I_Finish_2(a);
  88
  89 err_bn:
  90         i=ERR_R_BN_LIB;
  91 err:
  92         DSAerr(DSA_F_D2I_DSA_SIG,i);
  93         if ((ret != NULL) && ((a == NULL) || (*a != ret))) DSA_SIG_free(ret);
  94         if (bs != NULL) M_ASN1_BIT_STRING_free(bs);
  95         return(NULL);
  96 }