diff options
Diffstat (limited to 'openssl-1.1.0h/crypto/asn1/x_long.c')
| -rw-r--r-- | openssl-1.1.0h/crypto/asn1/x_long.c | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/openssl-1.1.0h/crypto/asn1/x_long.c b/openssl-1.1.0h/crypto/asn1/x_long.c new file mode 100644 index 0000000..5895345 --- /dev/null +++ b/openssl-1.1.0h/crypto/asn1/x_long.c @@ -0,0 +1,196 @@ +/* + * Copyright 2000-2016 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 <stdio.h> +#include "internal/cryptlib.h" +#include <openssl/asn1t.h> + +/* + * Custom primitive type for long handling. This converts between an + * ASN1_INTEGER and a long directly. + */ + +static int long_new(ASN1_VALUE **pval, const ASN1_ITEM *it); +static void long_free(ASN1_VALUE **pval, const ASN1_ITEM *it); + +static int long_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, + const ASN1_ITEM *it); +static int long_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, + int utype, char *free_cont, const ASN1_ITEM *it); +static int long_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it, + int indent, const ASN1_PCTX *pctx); + +static ASN1_PRIMITIVE_FUNCS long_pf = { + NULL, 0, + long_new, + long_free, + long_free, /* Clear should set to initial value */ + long_c2i, + long_i2c, + long_print +}; + +ASN1_ITEM_start(LONG) + ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &long_pf, ASN1_LONG_UNDEF, "LONG" +ASN1_ITEM_end(LONG) + +ASN1_ITEM_start(ZLONG) + ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &long_pf, 0, "ZLONG" +ASN1_ITEM_end(ZLONG) + +static int long_new(ASN1_VALUE **pval, const ASN1_ITEM *it) +{ + *(long *)pval = it->size; + return 1; +} + +static void long_free(ASN1_VALUE **pval, const ASN1_ITEM *it) +{ + *(long *)pval = it->size; +} + +/* + * Originally BN_num_bits_word was called to perform this operation, but + * trouble is that there is no guarantee that sizeof(long) equals to + * sizeof(BN_ULONG). BN_ULONG is a configurable type that can be as wide + * as long, but also double or half... + */ +static int num_bits_ulong(unsigned long value) +{ + size_t i; + unsigned long ret = 0; + + /* + * It is argued that *on average* constant counter loop performs + * not worse [if not better] than one with conditional break or + * mask-n-table-lookup-style, because of branch misprediction + * penalties. + */ + for (i = 0; i < sizeof(value) * 8; i++) { + ret += (value != 0); + value >>= 1; + } + + return (int)ret; +} + +static int long_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, + const ASN1_ITEM *it) +{ + long ltmp; + unsigned long utmp, sign; + int clen, pad, i; + /* this exists to bypass broken gcc optimization */ + char *cp = (char *)pval; + + /* use memcpy, because we may not be long aligned */ + memcpy(<mp, cp, sizeof(long)); + + if (ltmp == it->size) + return -1; + /* + * Convert the long to positive: we subtract one if negative so we can + * cleanly handle the padding if only the MSB of the leading octet is + * set. + */ + if (ltmp < 0) { + sign = 0xff; + utmp = 0 - (unsigned long)ltmp - 1; + } else { + sign = 0; + utmp = ltmp; + } + clen = num_bits_ulong(utmp); + /* If MSB of leading octet set we need to pad */ + if (!(clen & 0x7)) + pad = 1; + else + pad = 0; + + /* Convert number of bits to number of octets */ + clen = (clen + 7) >> 3; + + if (cont != NULL) { + if (pad) + *cont++ = (unsigned char)sign; + for (i = clen - 1; i >= 0; i--) { + cont[i] = (unsigned char)(utmp ^ sign); + utmp >>= 8; + } + } + return clen + pad; +} + +static int long_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, + int utype, char *free_cont, const ASN1_ITEM *it) +{ + int i; + long ltmp; + unsigned long utmp = 0, sign = 0x100; + char *cp = (char *)pval; + + if (len > 1) { + /* + * Check possible pad byte. Worst case, we're skipping past actual + * content, but since that's only with 0x00 and 0xff and we set neg + * accordingly, the result will be correct in the end anyway. + */ + switch (cont[0]) { + case 0xff: + cont++; + len--; + sign = 0xff; + break; + case 0: + cont++; + len--; + sign = 0; + break; + } + } + if (len > (int)sizeof(long)) { + ASN1err(ASN1_F_LONG_C2I, ASN1_R_INTEGER_TOO_LARGE_FOR_LONG); + return 0; + } + + if (sign == 0x100) { + /* Is it negative? */ + if (len && (cont[0] & 0x80)) + sign = 0xff; + else + sign = 0; + } else if (((sign ^ cont[0]) & 0x80) == 0) { /* same sign bit? */ + ASN1err(ASN1_F_LONG_C2I, ASN1_R_ILLEGAL_PADDING); + return 0; + } + utmp = 0; + for (i = 0; i < len; i++) { + utmp <<= 8; + utmp |= cont[i] ^ sign; + } + ltmp = (long)utmp; + if (ltmp < 0) { + ASN1err(ASN1_F_LONG_C2I, ASN1_R_INTEGER_TOO_LARGE_FOR_LONG); + return 0; + } + if (sign) + ltmp = -ltmp - 1; + if (ltmp == it->size) { + ASN1err(ASN1_F_LONG_C2I, ASN1_R_INTEGER_TOO_LARGE_FOR_LONG); + return 0; + } + memcpy(cp, <mp, sizeof(long)); + return 1; +} + +static int long_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it, + int indent, const ASN1_PCTX *pctx) +{ + return BIO_printf(out, "%ld\n", *(long *)pval); +} |