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Diffstat (limited to 'openssl/crypto/asn1/a_int.c')
| -rw-r--r-- | openssl/crypto/asn1/a_int.c | 459 |
1 files changed, 459 insertions, 0 deletions
diff --git a/openssl/crypto/asn1/a_int.c b/openssl/crypto/asn1/a_int.c new file mode 100644 index 000000000..f8d198efb --- /dev/null +++ b/openssl/crypto/asn1/a_int.c @@ -0,0 +1,459 @@ +/* crypto/asn1/a_int.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 <openssl/asn1.h> +#include <openssl/bn.h> + +ASN1_INTEGER *ASN1_INTEGER_dup(ASN1_INTEGER *x) +{ return M_ASN1_INTEGER_dup(x);} + +int ASN1_INTEGER_cmp(ASN1_INTEGER *x, ASN1_INTEGER *y) + { + int neg, ret; + /* Compare signs */ + neg = x->type & V_ASN1_NEG; + if (neg != (y->type & V_ASN1_NEG)) + { + if (neg) + return -1; + else + return 1; + } + + ret = ASN1_STRING_cmp(x, y); + + if (neg) + return -ret; + else + return ret; + } + + +/* + * This converts an ASN1 INTEGER into its content encoding. + * The internal representation is an ASN1_STRING whose data is a big endian + * representation of the value, ignoring the sign. The sign is determined by + * the type: V_ASN1_INTEGER for positive and V_ASN1_NEG_INTEGER for negative. + * + * Positive integers are no problem: they are almost the same as the DER + * encoding, except if the first byte is >= 0x80 we need to add a zero pad. + * + * Negative integers are a bit trickier... + * The DER representation of negative integers is in 2s complement form. + * The internal form is converted by complementing each octet and finally + * adding one to the result. This can be done less messily with a little trick. + * If the internal form has trailing zeroes then they will become FF by the + * complement and 0 by the add one (due to carry) so just copy as many trailing + * zeros to the destination as there are in the source. The carry will add one + * to the last none zero octet: so complement this octet and add one and finally + * complement any left over until you get to the start of the string. + * + * Padding is a little trickier too. If the first bytes is > 0x80 then we pad + * with 0xff. However if the first byte is 0x80 and one of the following bytes + * is non-zero we pad with 0xff. The reason for this distinction is that 0x80 + * followed by optional zeros isn't padded. + */ + +int i2c_ASN1_INTEGER(ASN1_INTEGER *a, unsigned char **pp) + { + int pad=0,ret,i,neg; + unsigned char *p,*n,pb=0; + + if ((a == NULL) || (a->data == NULL)) return(0); + neg=a->type & V_ASN1_NEG; + if (a->length == 0) + ret=1; + else + { + ret=a->length; + i=a->data[0]; + if (!neg && (i > 127)) { + pad=1; + pb=0; + } else if(neg) { + if(i>128) { + pad=1; + pb=0xFF; + } else if(i == 128) { + /* + * Special case: if any other bytes non zero we pad: + * otherwise we don't. + */ + for(i = 1; i < a->length; i++) if(a->data[i]) { + pad=1; + pb=0xFF; + break; + } + } + } + ret+=pad; + } + if (pp == NULL) return(ret); + p= *pp; + + if (pad) *(p++)=pb; + if (a->length == 0) *(p++)=0; + else if (!neg) memcpy(p,a->data,(unsigned int)a->length); + else { + /* Begin at the end of the encoding */ + n=a->data + a->length - 1; + p += a->length - 1; + i = a->length; + /* Copy zeros to destination as long as source is zero */ + while(!*n) { + *(p--) = 0; + n--; + i--; + } + /* Complement and increment next octet */ + *(p--) = ((*(n--)) ^ 0xff) + 1; + i--; + /* Complement any octets left */ + for(;i > 0; i--) *(p--) = *(n--) ^ 0xff; + } + + *pp+=ret; + return(ret); + } + +/* Convert just ASN1 INTEGER content octets to ASN1_INTEGER structure */ + +ASN1_INTEGER *c2i_ASN1_INTEGER(ASN1_INTEGER **a, const unsigned char **pp, + long len) + { + ASN1_INTEGER *ret=NULL; + const unsigned char *p, *pend; + unsigned char *to,*s; + int i; + + if ((a == NULL) || ((*a) == NULL)) + { + if ((ret=M_ASN1_INTEGER_new()) == NULL) return(NULL); + ret->type=V_ASN1_INTEGER; + } + else + ret=(*a); + + p= *pp; + pend = p + len; + + /* We must OPENSSL_malloc stuff, even for 0 bytes otherwise it + * signifies a missing NULL parameter. */ + s=(unsigned char *)OPENSSL_malloc((int)len+1); + if (s == NULL) + { + i=ERR_R_MALLOC_FAILURE; + goto err; + } + to=s; + if(!len) { + /* Strictly speaking this is an illegal INTEGER but we + * tolerate it. + */ + ret->type=V_ASN1_INTEGER; + } else if (*p & 0x80) /* a negative number */ + { + ret->type=V_ASN1_NEG_INTEGER; + if ((*p == 0xff) && (len != 1)) { + p++; + len--; + } + i = len; + p += i - 1; + to += i - 1; + while((!*p) && i) { + *(to--) = 0; + i--; + p--; + } + /* Special case: if all zeros then the number will be of + * the form FF followed by n zero bytes: this corresponds to + * 1 followed by n zero bytes. We've already written n zeros + * so we just append an extra one and set the first byte to + * a 1. This is treated separately because it is the only case + * where the number of bytes is larger than len. + */ + if(!i) { + *s = 1; + s[len] = 0; + len++; + } else { + *(to--) = (*(p--) ^ 0xff) + 1; + i--; + for(;i > 0; i--) *(to--) = *(p--) ^ 0xff; + } + } else { + ret->type=V_ASN1_INTEGER; + if ((*p == 0) && (len != 1)) + { + p++; + len--; + } + memcpy(s,p,(int)len); + } + + if (ret->data != NULL) OPENSSL_free(ret->data); + ret->data=s; + ret->length=(int)len; + if (a != NULL) (*a)=ret; + *pp=pend; + return(ret); +err: + ASN1err(ASN1_F_C2I_ASN1_INTEGER,i); + if ((ret != NULL) && ((a == NULL) || (*a != ret))) + M_ASN1_INTEGER_free(ret); + return(NULL); + } + + +/* This is a version of d2i_ASN1_INTEGER that ignores the sign bit of + * ASN1 integers: some broken software can encode a positive INTEGER + * with its MSB set as negative (it doesn't add a padding zero). + */ + +ASN1_INTEGER *d2i_ASN1_UINTEGER(ASN1_INTEGER **a, const unsigned char **pp, + long length) + { + ASN1_INTEGER *ret=NULL; + const unsigned char *p; + unsigned char *to,*s; + long len; + int inf,tag,xclass; + int i; + + if ((a == NULL) || ((*a) == NULL)) + { + if ((ret=M_ASN1_INTEGER_new()) == NULL) return(NULL); + ret->type=V_ASN1_INTEGER; + } + else + ret=(*a); + + p= *pp; + inf=ASN1_get_object(&p,&len,&tag,&xclass,length); + if (inf & 0x80) + { + i=ASN1_R_BAD_OBJECT_HEADER; + goto err; + } + + if (tag != V_ASN1_INTEGER) + { + i=ASN1_R_EXPECTING_AN_INTEGER; + goto err; + } + + /* We must OPENSSL_malloc stuff, even for 0 bytes otherwise it + * signifies a missing NULL parameter. */ + s=(unsigned char *)OPENSSL_malloc((int)len+1); + if (s == NULL) + { + i=ERR_R_MALLOC_FAILURE; + goto err; + } + to=s; + ret->type=V_ASN1_INTEGER; + if(len) { + if ((*p == 0) && (len != 1)) + { + p++; + len--; + } + memcpy(s,p,(int)len); + p+=len; + } + + if (ret->data != NULL) OPENSSL_free(ret->data); + ret->data=s; + ret->length=(int)len; + if (a != NULL) (*a)=ret; + *pp=p; + return(ret); +err: + ASN1err(ASN1_F_D2I_ASN1_UINTEGER,i); + if ((ret != NULL) && ((a == NULL) || (*a != ret))) + M_ASN1_INTEGER_free(ret); + return(NULL); + } + +int ASN1_INTEGER_set(ASN1_INTEGER *a, long v) + { + int j,k; + unsigned int i; + unsigned char buf[sizeof(long)+1]; + long d; + + a->type=V_ASN1_INTEGER; + if (a->length < (int)(sizeof(long)+1)) + { + if (a->data != NULL) + OPENSSL_free(a->data); + if ((a->data=(unsigned char *)OPENSSL_malloc(sizeof(long)+1)) != NULL) + memset((char *)a->data,0,sizeof(long)+1); + } + if (a->data == NULL) + { + ASN1err(ASN1_F_ASN1_INTEGER_SET,ERR_R_MALLOC_FAILURE); + return(0); + } + d=v; + if (d < 0) + { + d= -d; + a->type=V_ASN1_NEG_INTEGER; + } + + for (i=0; i<sizeof(long); i++) + { + if (d == 0) break; + buf[i]=(int)d&0xff; + d>>=8; + } + j=0; + for (k=i-1; k >=0; k--) + a->data[j++]=buf[k]; + a->length=j; + return(1); + } + +long ASN1_INTEGER_get(ASN1_INTEGER *a) + { + int neg=0,i; + long r=0; + + if (a == NULL) return(0L); + i=a->type; + if (i == V_ASN1_NEG_INTEGER) + neg=1; + else if (i != V_ASN1_INTEGER) + return -1; + + if (a->length > (int)sizeof(long)) + { + /* hmm... a bit ugly */ + return(0xffffffffL); + } + if (a->data == NULL) + return 0; + + for (i=0; i<a->length; i++) + { + r<<=8; + r|=(unsigned char)a->data[i]; + } + if (neg) r= -r; + return(r); + } + +ASN1_INTEGER *BN_to_ASN1_INTEGER(BIGNUM *bn, ASN1_INTEGER *ai) + { + ASN1_INTEGER *ret; + int len,j; + + if (ai == NULL) + ret=M_ASN1_INTEGER_new(); + else + ret=ai; + if (ret == NULL) + { + ASN1err(ASN1_F_BN_TO_ASN1_INTEGER,ERR_R_NESTED_ASN1_ERROR); + goto err; + } + if (BN_is_negative(bn)) + ret->type = V_ASN1_NEG_INTEGER; + else ret->type=V_ASN1_INTEGER; + j=BN_num_bits(bn); + len=((j == 0)?0:((j/8)+1)); + if (ret->length < len+4) + { + unsigned char *new_data=OPENSSL_realloc(ret->data, len+4); + if (!new_data) + { + ASN1err(ASN1_F_BN_TO_ASN1_INTEGER,ERR_R_MALLOC_FAILURE); + goto err; + } + ret->data=new_data; + } + ret->length=BN_bn2bin(bn,ret->data); + /* Correct zero case */ + if(!ret->length) + { + ret->data[0] = 0; + ret->length = 1; + } + return(ret); +err: + if (ret != ai) M_ASN1_INTEGER_free(ret); + return(NULL); + } + +BIGNUM *ASN1_INTEGER_to_BN(ASN1_INTEGER *ai, BIGNUM *bn) + { + BIGNUM *ret; + + if ((ret=BN_bin2bn(ai->data,ai->length,bn)) == NULL) + ASN1err(ASN1_F_ASN1_INTEGER_TO_BN,ASN1_R_BN_LIB); + else if(ai->type == V_ASN1_NEG_INTEGER) + BN_set_negative(ret, 1); + return(ret); + } + +IMPLEMENT_STACK_OF(ASN1_INTEGER) +IMPLEMENT_ASN1_SET_OF(ASN1_INTEGER) |