diff options
Diffstat (limited to 'openssl-1.1.0h/crypto/asn1/a_bitstr.c')
| -rw-r--r-- | openssl-1.1.0h/crypto/asn1/a_bitstr.c | 216 |
1 files changed, 216 insertions, 0 deletions
diff --git a/openssl-1.1.0h/crypto/asn1/a_bitstr.c b/openssl-1.1.0h/crypto/asn1/a_bitstr.c new file mode 100644 index 0000000..b2e0fb6 --- /dev/null +++ b/openssl-1.1.0h/crypto/asn1/a_bitstr.c @@ -0,0 +1,216 @@ +/* + * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. + * + * Licensed under the OpenSSL license (the "License"). You may not use + * this file except in compliance with the License. You can obtain a copy + * in the file LICENSE in the source distribution or at + * https://www.openssl.org/source/license.html + */ + +#include <limits.h> +#include <stdio.h> +#include "internal/cryptlib.h" +#include <openssl/asn1.h> +#include "asn1_locl.h" + +int ASN1_BIT_STRING_set(ASN1_BIT_STRING *x, unsigned char *d, int len) +{ + return ASN1_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; + if (len > 0) { + memcpy(p, d, len); + p += len; + 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 i; + + if (len < 1) { + i = ASN1_R_STRING_TOO_SHORT; + goto err; + } + + if (len > INT_MAX) { + i = ASN1_R_STRING_TOO_LONG; + goto err; + } + + if ((a == NULL) || ((*a) == NULL)) { + if ((ret = ASN1_BIT_STRING_new()) == NULL) + return (NULL); + } else + ret = (*a); + + p = *pp; + i = *(p++); + if (i > 7) { + i = 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 | i); /* set */ + + if (len-- > 1) { /* using one because of the bits left byte */ + s = OPENSSL_malloc((int)len); + if (s == NULL) { + i = ERR_R_MALLOC_FAILURE; + goto err; + } + memcpy(s, p, (int)len); + s[len - 1] &= (0xff << i); + p += len; + } else + s = NULL; + + ret->length = (int)len; + OPENSSL_free(ret->data); + ret->data = s; + ret->type = V_ASN1_BIT_STRING; + if (a != NULL) + (*a) = ret; + *pp = p; + return (ret); + err: + ASN1err(ASN1_F_C2I_ASN1_BIT_STRING, i); + if ((a == NULL) || (*a != ret)) + 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 */ + c = OPENSSL_clear_realloc(a->data, a->length, w + 1); + if (c == NULL) { + ASN1err(ASN1_F_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(const 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(const ASN1_BIT_STRING *a, + const 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; +} |