unber.c

RSA加密/解密算法源码 asn1c-0.9.12

	if(BER_TAG_CLASS(tlv_tag) == ASN_TAG_CLASS_UNIVERSAL) {
		const char *str;
		ber_tlv_tag_t tvalue = BER_TAG_VALUE(tlv_tag);
		str = ASN_UNIVERSAL_TAG2STR(tvalue);
		if(str) printf(" A=\"%s\"", str);
	}

	if(fin) printf(">\n");
}

/*
 * Print the value in binary form, or reformat for pretty-printing.
 */
static int
print_V(const char *fname, FILE *fp, ber_tlv_tag_t tlv_tag, ber_tlv_len_t tlv_len) {
	asn1c_integer_t *arcs = 0;	/* Object identifier arcs */
	unsigned char *vbuf = 0;
	asn1p_expr_type_e etype = 0;
	asn1c_integer_t collector = 0;
	int special_format = 0;
	ssize_t i;

	/* Figure out what type is it */
	if(BER_TAG_CLASS(tlv_tag) == ASN_TAG_CLASS_UNIVERSAL
	&& pretty_printing) {
		ber_tlv_tag_t tvalue = BER_TAG_VALUE(tlv_tag);
		etype = ASN_UNIVERSAL_TAG2TYPE(tvalue);
	}

	/*
	 * Determine how to print the value, either in its native binary form,
	 * encoded with &xNN characters, or using pretty-printing.
	 * The basic string types (including "useful types", like UTCTime)
	 * are excempt from this determination logic, because their alphabets
	 * are subsets of the XML's native UTF-8 encoding.
	 */
	switch(etype) {
	case ASN_BASIC_BOOLEAN:
		if(tlv_len == 1)
			special_format = 1;
		else
			etype = 0;
		break;
	case ASN_BASIC_INTEGER:
	case ASN_BASIC_ENUMERATED:
		if((size_t)tlv_len <= sizeof(collector))
			special_format = 1;
		else
			etype = 0;
		break;
	case ASN_BASIC_OBJECT_IDENTIFIER:
	case ASN_BASIC_RELATIVE_OID:
		if(tlv_len > 0 && tlv_len < 128*1024 /* VERY long OID! */) {
			arcs = malloc(sizeof(*arcs) * (tlv_len + 1));
			if(arcs) {
				vbuf = malloc(tlv_len + 1);
				/* Not checking is intentional */
			}
		}
	case ASN_BASIC_UTCTime:
	case ASN_BASIC_GeneralizedTime:
	case ASN_STRING_NumericString:
	case ASN_STRING_PrintableString:
	case ASN_STRING_VisibleString:
	case ASN_STRING_IA5String:
	case ASN_STRING_UTF8String:
		break;	/* Directly compatible with UTF-8 */
	case ASN_STRING_BMPString:
	case ASN_STRING_UniversalString:
		break;	/* Not directly compatible with UTF-8 */
	default:
		/* Conditionally compatible with UTF-8 */
		if((
			(etype & ASN_STRING_MASK)
			||
			(etype == ASN_BASIC_OCTET_STRING)
			||
			/*
			 * AUTOMATIC TAGS or IMPLICIT TAGS in effect,
			 * Treat this primitive type as OCTET_STRING.
			 */
			(BER_TAG_CLASS(tlv_tag) != ASN_TAG_CLASS_UNIVERSAL
				&& pretty_printing)
		) && (tlv_len > 0 && tlv_len < 128 * 1024)) {
			vbuf = malloc(tlv_len + 1);
			/* Not checking is intentional */
		}
		break;
	}

	/* If collection vbuf is present, defer printing the F flag. */
	if(!vbuf) printf(special_format ? " F>" : ">");

	/*
	 * Print the value in binary or text form,
	 * or collect the bytes into vbuf.
	 */
	for(i = 0; i < tlv_len; i++) {
		int ch = fgetc(fp);
		if(ch == -1) {
			fprintf(stderr,
			"%s: Unexpected end of file (V)\n", fname);
			if(vbuf) free(vbuf);
			if(arcs) free(arcs);
			return -1;
		}
		switch(etype) {
		case ASN_BASIC_UTCTime:
		case ASN_BASIC_GeneralizedTime:
		case ASN_STRING_NumericString:
		case ASN_STRING_PrintableString:
		case ASN_STRING_VisibleString:
		case ASN_STRING_IA5String:
		case ASN_STRING_UTF8String:
			switch(ch) {
			default:
				if(((etype == ASN_STRING_UTF8String)
					|| !(ch & 0x80))
				&& (ch >= 0x20)
				) {
					printf("%c", ch);
					break;
				}
				/* Fall through */
			case 0x3c: case 0x3e: case 0x26:
				printf("&#x%02x;", ch);
			}
			break;
		case ASN_BASIC_BOOLEAN:
			switch(ch) {
			case 0: printf("<false/>"); break;
			case 0xff: printf("<true/>"); break;
			default: printf("<true value=\"&#x%02x\"/>", ch);
			}
			break;
		case ASN_BASIC_INTEGER:
		case ASN_BASIC_ENUMERATED:
			if(i)	collector = collector * 256 + ch;
			else	collector = (int)(signed char)ch;
			break;
		default:
			if(vbuf) {
				vbuf[i] = ch;
			} else {
				printf("&#x%02x;", ch);
			}
		}
	}

	/* Do post-processing */
	switch(etype) {
	case ASN_BASIC_INTEGER:
	case ASN_BASIC_ENUMERATED:
		printf("%" PRIdASN, collector);
		break;
	case ASN_BASIC_OBJECT_IDENTIFIER:
		if(vbuf) {
			OBJECT_IDENTIFIER_t oid;
			int arcno;

			oid.buf = vbuf;
			oid.size = tlv_len;

			arcno = OBJECT_IDENTIFIER_get_arcs(&oid, arcs,
				sizeof(*arcs), tlv_len + 1);
			if(arcno >= 0) {
				assert(arcno <= (tlv_len + 1));
				printf(" F>");
				for(i = 0; i < arcno; i++) {
					if(i) printf(".");
					printf("%" PRIuASN, arcs[i]);
				}
				free(vbuf);
				vbuf = 0;
			}
		}
		break;
	case ASN_BASIC_RELATIVE_OID:
		if(vbuf) {
			RELATIVE_OID_t oid;
			int arcno;

			oid.buf = vbuf;
			oid.size = tlv_len;
	
			arcno = RELATIVE_OID_get_arcs(&oid, arcs,
				sizeof(*arcs), tlv_len);
			if(arcno >= 0) {
				assert(arcno <= (tlv_len + 1));
				printf(" F>");
				for(i = 0; i < arcno; i++) {
					if(i) printf(".");
					printf("%" PRIuASN, arcs[i]);
				}
				free(vbuf);
				vbuf = 0;
			}
		}
		break;
	default: break;
	}

	/*
	 * If the buffer was not consumed, print it out.
	 * It might be an OCTET STRING or other primitive type,
	 * which might actually be printable, but we need to figure it out.
	 */
	if(vbuf) {
		int binary;

		/*
		 * Check whether the data could be represented as text
		 */
		binary = -1 * (tlv_len >> 3); /* Threshold is 12.5% binary */
		for(i = 0; i < tlv_len; i++) {
			switch(vbuf[i]) {
			case 0x1b: binary = 1; break;
			case 0x09: case 0x0a: case 0x0d: continue;
			default:
				if(vbuf[i] < 0x20 || vbuf[i] >= 0x7f)
					if(++binary > 0)  /* Way too many */
						break;
				continue;
			}
			break;
		}
		printf(">");
		for(i = 0; i < tlv_len; i++) {
			if(binary > 0 || vbuf[i] < 0x20 || vbuf[i] >= 0x7f
				|| vbuf[i] == 0x26	/* '&' */
				|| vbuf[i] == 0x3c	/* '<' */
				|| vbuf[i] == 0x3e	/* '>' */
			)
				printf("&#x%02x;", vbuf[i]);
			else
				printf("%c", vbuf[i]);
		}
		free(vbuf);
	}

	if(arcs) free(arcs);
	return 0;
}


static int
decode_tlv_from_string(const char *datastring) {
	unsigned char *data, *dp;
	size_t dsize;	/* Data size */
	ssize_t len;
	ber_tlv_tag_t tlv_tag;
	ber_tlv_len_t tlv_len;
	const char *p;
	int half;

	dsize = strlen(datastring) + 1;
	dp = data = calloc(1, dsize);
	assert(data);

	for(half = 0, p = datastring; *p; p++) {
		switch(*p) {
		case '0': case '1': case '2': case '3': case '4':
		case '5': case '6': case '7': case '8': case '9':
			*dp |= *p - '0'; break;
		case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
			*dp |= *p - 'A' + 10; break;
		case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
			*dp |= *p - 'a' + 10; break;
		case ' ': case '\t': case '\r': case '\n':
			continue;
		default:
			fprintf(stderr, "Unexpected symbols in data string:\n");
			fprintf(stderr, "%s\n", datastring);
			for(dp = data; datastring < p; datastring++, dp++)
				*dp = ' ';
			*dp = '\0';
			fprintf(stderr, "%s^ <- here\n", (char *)data);
			return -1;
		}
		if(half) dp++; else (*dp) <<= 4;
		half = !half;
	}

	assert((size_t)(dp - data) <= dsize);
	dsize = dp - data;

	printf("BER: ");
	for(dp = data; dp < data + dsize; dp++)
		printf("%02X", *dp);
	printf("\n");

	len = ber_fetch_tag(data, dsize, &tlv_tag);
	switch(len) {
	case -1:
		fprintf(stderr, "TAG: Fatal error deciphering tag\n");
		return -1;
	case 0:
		fprintf(stderr, "TAG: More data expected\n");
		return -1;
	default:
		printf("TAG: ");
		ber_tlv_tag_fwrite(tlv_tag, stdout);
		if(BER_TLV_CONSTRUCTED(data)) {
			printf(" (constructed)");
		} else if(dsize >= 2 && data[0] == 0 && data[1] == 0) {
			printf(" (end-of-content)");
		} else {
			printf(" (primitive)");
		}
		if(BER_TAG_CLASS(tlv_tag) == ASN_TAG_CLASS_UNIVERSAL) {
			const char *str;
			ber_tlv_tag_t tvalue = BER_TAG_VALUE(tlv_tag);
			str = ASN_UNIVERSAL_TAG2STR(tvalue);
			if(str) printf(" \"%s\"", str);
		}
		printf("\n");
	}

	if(dsize > (size_t)len) {
		len = ber_fetch_length(BER_TLV_CONSTRUCTED(data),
			data + len, dsize - len, &tlv_len);
		switch(len) {
		case -1:
			fprintf(stderr,
				"LEN: Fatal error deciphering length\n");
			return -1;
		case 0:
			fprintf(stderr, "LEN: More data expected\n");
			return -1;
		default:
			if(tlv_len == (ber_tlv_len_t)-1)
				printf("LEN: Indefinite length encoding\n");
			else
				printf("LEN: %ld bytes\n", (long)tlv_len);
		}
	}

	return 0;
}

/*
 * Dummy functions.
 */
asn_dec_rval_t ber_check_tags(asn_codec_ctx_t *opt_codec_ctx, asn_TYPE_descriptor_t *td, asn_struct_ctx_t *opt_ctx, void *ptr, size_t size, int tag_mode, int last_tag_form, ber_tlv_len_t *last_length, int *opt_tlv_form) { asn_dec_rval_t rv; (void)opt_codec_ctx; (void)td; (void)opt_ctx; (void)ptr; (void)size; (void)tag_mode; (void)last_tag_form; (void)last_length; (void)opt_tlv_form; return rv; }

ssize_t der_write_tags(asn_TYPE_descriptor_t *td, size_t slen, int tag_mode, int last_tag_form, ber_tlv_tag_t tag, asn_app_consume_bytes_f *cb, void *app_key) { (void)td; (void)slen; (void)tag_mode; (void)last_tag_form; (void)tag; (void)cb; (void)app_key; return -1; }

asn_dec_rval_t xer_decode_general(asn_codec_ctx_t *opt_codec_ctx, asn_struct_ctx_t *ctx, void *struct_key, const char *xml_tag, const void *buf_ptr, size_t size, int (*otd)(void *struct_key, const void *chunk_buf, size_t chunk_size), ssize_t (*br)(void *struct_key, const void *chunk_buf, size_t chunk_size, int have_more)) { asn_dec_rval_t rv; (void)opt_codec_ctx; (void)ctx; (void)struct_key; (void)xml_tag; (void)buf_ptr; (void)size; (void)otd; (void)br; return rv; }

int xer_is_whitespace(const void *b, size_t s) { (void)b; (void)s; return 0; }