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Diffstat (limited to 'src/crypto/asn1/a_bitstr.c')
| -rw-r--r-- | src/crypto/asn1/a_bitstr.c | 258 |
1 files changed, 258 insertions, 0 deletions
diff --git a/src/crypto/asn1/a_bitstr.c b/src/crypto/asn1/a_bitstr.c new file mode 100644 index 0000000..8055f0c --- /dev/null +++ b/src/crypto/asn1/a_bitstr.c @@ -0,0 +1,258 @@ +/* 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 <openssl/asn1.h> + +#include <string.h> + +#include <openssl/err.h> +#include <openssl/mem.h> + + +int ASN1_BIT_STRING_set(ASN1_BIT_STRING *x, unsigned char *d, int len) +{ return M_ASN1_BIT_STRING_set(x, d, len); } + +int i2c_ASN1_BIT_STRING(ASN1_BIT_STRING *a, unsigned char **pp) + { + int ret,j,bits,len; + unsigned char *p,*d; + + if (a == NULL) return(0); + + len=a->length; + + if (len > 0) + { + if (a->flags & ASN1_STRING_FLAG_BITS_LEFT) + { + bits=(int)a->flags&0x07; + } + else + { + for ( ; len > 0; len--) + { + if (a->data[len-1]) break; + } + j=a->data[len-1]; + if (j & 0x01) bits=0; + else if (j & 0x02) bits=1; + else if (j & 0x04) bits=2; + else if (j & 0x08) bits=3; + else if (j & 0x10) bits=4; + else if (j & 0x20) bits=5; + else if (j & 0x40) bits=6; + else if (j & 0x80) bits=7; + else bits=0; /* should not happen */ + } + } + else + bits=0; + + ret=1+len; + if (pp == NULL) return(ret); + + p= *pp; + + *(p++)=(unsigned char)bits; + d=a->data; + memcpy(p,d,len); + p+=len; + if (len > 0) p[-1]&=(0xff<<bits); + *pp=p; + return(ret); + } + +ASN1_BIT_STRING *c2i_ASN1_BIT_STRING(ASN1_BIT_STRING **a, + const unsigned char **pp, long len) + { + ASN1_BIT_STRING *ret=NULL; + const unsigned char *p; + unsigned char *s; + int padding; + + if (len < 1) + { + OPENSSL_PUT_ERROR(ASN1, c2i_ASN1_BIT_STRING, + ASN1_R_STRING_TOO_SHORT); + goto err; + } + + if ((a == NULL) || ((*a) == NULL)) + { + if ((ret=M_ASN1_BIT_STRING_new()) == NULL) return(NULL); + } + else + ret=(*a); + + p= *pp; + padding = *(p++); + if (padding > 7) + { + OPENSSL_PUT_ERROR(ASN1, c2i_ASN1_BIT_STRING, + ASN1_R_INVALID_BIT_STRING_BITS_LEFT); + goto err; + } + + /* We do this to preserve the settings. If we modify + * the settings, via the _set_bit function, we will recalculate + * on output */ + ret->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear */ + ret->flags|=(ASN1_STRING_FLAG_BITS_LEFT|padding); /* set */ + + if (len-- > 1) /* using one because of the bits left byte */ + { + s=(unsigned char *)OPENSSL_malloc((int)len); + if (s == NULL) + { + OPENSSL_PUT_ERROR(ASN1, c2i_ASN1_BIT_STRING, + ERR_R_MALLOC_FAILURE); + goto err; + } + memcpy(s,p,(int)len); + s[len-1]&=(0xff<<padding); + p+=len; + } + else + s=NULL; + + ret->length=(int)len; + if (ret->data != NULL) OPENSSL_free(ret->data); + ret->data=s; + ret->type=V_ASN1_BIT_STRING; + if (a != NULL) (*a)=ret; + *pp=p; + return(ret); +err: + if ((ret != NULL) && ((a == NULL) || (*a != ret))) + M_ASN1_BIT_STRING_free(ret); + return(NULL); + } + +/* These next 2 functions from Goetz Babin-Ebell <babinebell@trustcenter.de> + */ +int ASN1_BIT_STRING_set_bit(ASN1_BIT_STRING *a, int n, int value) + { + int w,v,iv; + unsigned char *c; + + w=n/8; + v=1<<(7-(n&0x07)); + iv= ~v; + if (!value) v=0; + + if (a == NULL) + return 0; + + a->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear, set on write */ + + if ((a->length < (w+1)) || (a->data == NULL)) + { + if (!value) return(1); /* Don't need to set */ + if (a->data == NULL) + c=(unsigned char *)OPENSSL_malloc(w+1); + else + c=(unsigned char *)OPENSSL_realloc_clean(a->data, + a->length, + w+1); + if (c == NULL) + { + OPENSSL_PUT_ERROR(ASN1, ASN1_BIT_STRING_set_bit, ERR_R_MALLOC_FAILURE); + return 0; + } + if (w+1-a->length > 0) memset(c+a->length, 0, w+1-a->length); + a->data=c; + a->length=w+1; + } + a->data[w]=((a->data[w])&iv)|v; + while ((a->length > 0) && (a->data[a->length-1] == 0)) + a->length--; + return(1); + } + +int ASN1_BIT_STRING_get_bit(ASN1_BIT_STRING *a, int n) + { + int w,v; + + w=n/8; + v=1<<(7-(n&0x07)); + if ((a == NULL) || (a->length < (w+1)) || (a->data == NULL)) + return(0); + return((a->data[w]&v) != 0); + } + +/* + * Checks if the given bit string contains only bits specified by + * the flags vector. Returns 0 if there is at least one bit set in 'a' + * which is not specified in 'flags', 1 otherwise. + * 'len' is the length of 'flags'. + */ +int ASN1_BIT_STRING_check(ASN1_BIT_STRING *a, + unsigned char *flags, int flags_len) + { + int i, ok; + /* Check if there is one bit set at all. */ + if (!a || !a->data) return 1; + + /* Check each byte of the internal representation of the bit string. */ + ok = 1; + for (i = 0; i < a->length && ok; ++i) + { + unsigned char mask = i < flags_len ? ~flags[i] : 0xff; + /* We are done if there is an unneeded bit set. */ + ok = (a->data[i] & mask) == 0; + } + return ok; + } |