- size_t 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=OPENSSL_malloc(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,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).
+ long len)
+{
+ ASN1_INTEGER *ret = NULL;
+ const unsigned char *p, *pend;
+ unsigned char *to, *s;
+ int i;
+
+ if ((a == NULL) || ((*a) == NULL)) {
+ if ((ret = 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 = 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);
+ }
+
+ 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 ((a == NULL) || (*a != ret))
+ 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).