pem_lib.c

OpenSSL 0.9.8k 最新版OpenSSL

	unsigned char key[EVP_MAX_KEY_LENGTH];
	char buf[PEM_BUFSIZE];

	len= *plen;

	if (cipher->cipher == NULL) return(1);
	if (callback == NULL)
		klen=PEM_def_callback(buf,PEM_BUFSIZE,0,u);
	else
		klen=callback(buf,PEM_BUFSIZE,0,u);
	if (klen <= 0)
		{
		PEMerr(PEM_F_PEM_DO_HEADER,PEM_R_BAD_PASSWORD_READ);
		return(0);
		}
#ifdef CHARSET_EBCDIC
	/* Convert the pass phrase from EBCDIC */
	ebcdic2ascii(buf, buf, klen);
#endif

	EVP_BytesToKey(cipher->cipher,EVP_md5(),&(cipher->iv[0]),
		(unsigned char *)buf,klen,1,key,NULL);

	j=(int)len;
	EVP_CIPHER_CTX_init(&ctx);
	EVP_DecryptInit_ex(&ctx,cipher->cipher,NULL, key,&(cipher->iv[0]));
	EVP_DecryptUpdate(&ctx,data,&i,data,j);
	o=EVP_DecryptFinal_ex(&ctx,&(data[i]),&j);
	EVP_CIPHER_CTX_cleanup(&ctx);
	OPENSSL_cleanse((char *)buf,sizeof(buf));
	OPENSSL_cleanse((char *)key,sizeof(key));
	j+=i;
	if (!o)
		{
		PEMerr(PEM_F_PEM_DO_HEADER,PEM_R_BAD_DECRYPT);
		return(0);
		}
	*plen=j;
	return(1);
	}

int PEM_get_EVP_CIPHER_INFO(char *header, EVP_CIPHER_INFO *cipher)
	{
	int o;
	const EVP_CIPHER *enc=NULL;
	char *p,c;
	char **header_pp = &header;

	cipher->cipher=NULL;
	if ((header == NULL) || (*header == '\0') || (*header == '\n'))
		return(1);
	if (strncmp(header,"Proc-Type: ",11) != 0)
		{ PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO,PEM_R_NOT_PROC_TYPE); return(0); }
	header+=11;
	if (*header != '4') return(0); header++;
	if (*header != ',') return(0); header++;
	if (strncmp(header,"ENCRYPTED",9) != 0)
		{ PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO,PEM_R_NOT_ENCRYPTED); return(0); }
	for (; (*header != '\n') && (*header != '\0'); header++)
		;
	if (*header == '\0')
		{ PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO,PEM_R_SHORT_HEADER); return(0); }
	header++;
	if (strncmp(header,"DEK-Info: ",10) != 0)
		{ PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO,PEM_R_NOT_DEK_INFO); return(0); }
	header+=10;

	p=header;
	for (;;)
		{
		c= *header;
#ifndef CHARSET_EBCDIC
		if (!(	((c >= 'A') && (c <= 'Z')) || (c == '-') ||
			((c >= '0') && (c <= '9'))))
			break;
#else
		if (!(	isupper(c) || (c == '-') ||
			isdigit(c)))
			break;
#endif
		header++;
		}
	*header='\0';
	o=OBJ_sn2nid(p);
	cipher->cipher=enc=EVP_get_cipherbyname(p);
	*header=c;
	header++;

	if (enc == NULL)
		{
		PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO,PEM_R_UNSUPPORTED_ENCRYPTION);
		return(0);
		}
	if (!load_iv(header_pp,&(cipher->iv[0]),enc->iv_len))
		return(0);

	return(1);
	}

static int load_iv(char **fromp, unsigned char *to, int num)
	{
	int v,i;
	char *from;

	from= *fromp;
	for (i=0; i<num; i++) to[i]=0;
	num*=2;
	for (i=0; i<num; i++)
		{
		if ((*from >= '0') && (*from <= '9'))
			v= *from-'0';
		else if ((*from >= 'A') && (*from <= 'F'))
			v= *from-'A'+10;
		else if ((*from >= 'a') && (*from <= 'f'))
			v= *from-'a'+10;
		else
			{
			PEMerr(PEM_F_LOAD_IV,PEM_R_BAD_IV_CHARS);
			return(0);
			}
		from++;
		to[i/2]|=v<<(long)((!(i&1))*4);
		}

	*fromp=from;
	return(1);
	}

#ifndef OPENSSL_NO_FP_API
int PEM_write(FILE *fp, char *name, char *header, unsigned char *data,
	     long len)
        {
        BIO *b;
        int ret;

        if ((b=BIO_new(BIO_s_file())) == NULL)
		{
		PEMerr(PEM_F_PEM_WRITE,ERR_R_BUF_LIB);
                return(0);
		}
        BIO_set_fp(b,fp,BIO_NOCLOSE);
        ret=PEM_write_bio(b, name, header, data,len);
        BIO_free(b);
        return(ret);
        }
#endif

int PEM_write_bio(BIO *bp, const char *name, char *header, unsigned char *data,
	     long len)
	{
	int nlen,n,i,j,outl;
	unsigned char *buf = NULL;
	EVP_ENCODE_CTX ctx;
	int reason=ERR_R_BUF_LIB;
	
	EVP_EncodeInit(&ctx);
	nlen=strlen(name);

	if (	(BIO_write(bp,"-----BEGIN ",11) != 11) ||
		(BIO_write(bp,name,nlen) != nlen) ||
		(BIO_write(bp,"-----\n",6) != 6))
		goto err;
		
	i=strlen(header);
	if (i > 0)
		{
		if (	(BIO_write(bp,header,i) != i) ||
			(BIO_write(bp,"\n",1) != 1))
			goto err;
		}

	buf = OPENSSL_malloc(PEM_BUFSIZE*8);
	if (buf == NULL)
		{
		reason=ERR_R_MALLOC_FAILURE;
		goto err;
		}

	i=j=0;
	while (len > 0)
		{
		n=(int)((len>(PEM_BUFSIZE*5))?(PEM_BUFSIZE*5):len);
		EVP_EncodeUpdate(&ctx,buf,&outl,&(data[j]),n);
		if ((outl) && (BIO_write(bp,(char *)buf,outl) != outl))
			goto err;
		i+=outl;
		len-=n;
		j+=n;
		}
	EVP_EncodeFinal(&ctx,buf,&outl);
	if ((outl > 0) && (BIO_write(bp,(char *)buf,outl) != outl)) goto err;
	OPENSSL_cleanse(buf, PEM_BUFSIZE*8);
	OPENSSL_free(buf);
	buf = NULL;
	if (	(BIO_write(bp,"-----END ",9) != 9) ||
		(BIO_write(bp,name,nlen) != nlen) ||
		(BIO_write(bp,"-----\n",6) != 6))
		goto err;
	return(i+outl);
err:
	if (buf) {
		OPENSSL_cleanse(buf, PEM_BUFSIZE*8);
		OPENSSL_free(buf);
	}
	PEMerr(PEM_F_PEM_WRITE_BIO,reason);
	return(0);
	}

#ifndef OPENSSL_NO_FP_API
int PEM_read(FILE *fp, char **name, char **header, unsigned char **data,
	     long *len)
        {
        BIO *b;
        int ret;

        if ((b=BIO_new(BIO_s_file())) == NULL)
		{
		PEMerr(PEM_F_PEM_READ,ERR_R_BUF_LIB);
                return(0);
		}
        BIO_set_fp(b,fp,BIO_NOCLOSE);
        ret=PEM_read_bio(b, name, header, data,len);
        BIO_free(b);
        return(ret);
        }
#endif

int PEM_read_bio(BIO *bp, char **name, char **header, unsigned char **data,
	     long *len)
	{
	EVP_ENCODE_CTX ctx;
	int end=0,i,k,bl=0,hl=0,nohead=0;
	char buf[256];
	BUF_MEM *nameB;
	BUF_MEM *headerB;
	BUF_MEM *dataB,*tmpB;
	
	nameB=BUF_MEM_new();
	headerB=BUF_MEM_new();
	dataB=BUF_MEM_new();
	if ((nameB == NULL) || (headerB == NULL) || (dataB == NULL))
		{
		BUF_MEM_free(nameB);
		BUF_MEM_free(headerB);
		BUF_MEM_free(dataB);
		PEMerr(PEM_F_PEM_READ_BIO,ERR_R_MALLOC_FAILURE);
		return(0);
		}

	buf[254]='\0';
	for (;;)
		{
		i=BIO_gets(bp,buf,254);

		if (i <= 0)
			{
			PEMerr(PEM_F_PEM_READ_BIO,PEM_R_NO_START_LINE);
			goto err;
			}

		while ((i >= 0) && (buf[i] <= ' ')) i--;
		buf[++i]='\n'; buf[++i]='\0';

		if (strncmp(buf,"-----BEGIN ",11) == 0)
			{
			i=strlen(&(buf[11]));

			if (strncmp(&(buf[11+i-6]),"-----\n",6) != 0)
				continue;
			if (!BUF_MEM_grow(nameB,i+9))
				{
				PEMerr(PEM_F_PEM_READ_BIO,ERR_R_MALLOC_FAILURE);
				goto err;
				}
			memcpy(nameB->data,&(buf[11]),i-6);
			nameB->data[i-6]='\0';
			break;
			}
		}
	hl=0;
	if (!BUF_MEM_grow(headerB,256))
		{ PEMerr(PEM_F_PEM_READ_BIO,ERR_R_MALLOC_FAILURE); goto err; }
	headerB->data[0]='\0';
	for (;;)
		{
		i=BIO_gets(bp,buf,254);
		if (i <= 0) break;

		while ((i >= 0) && (buf[i] <= ' ')) i--;
		buf[++i]='\n'; buf[++i]='\0';

		if (buf[0] == '\n') break;
		if (!BUF_MEM_grow(headerB,hl+i+9))
			{ PEMerr(PEM_F_PEM_READ_BIO,ERR_R_MALLOC_FAILURE); goto err; }
		if (strncmp(buf,"-----END ",9) == 0)
			{
			nohead=1;
			break;
			}
		memcpy(&(headerB->data[hl]),buf,i);
		headerB->data[hl+i]='\0';
		hl+=i;
		}

	bl=0;
	if (!BUF_MEM_grow(dataB,1024))
		{ PEMerr(PEM_F_PEM_READ_BIO,ERR_R_MALLOC_FAILURE); goto err; }
	dataB->data[0]='\0';
	if (!nohead)
		{
		for (;;)
			{
			i=BIO_gets(bp,buf,254);
			if (i <= 0) break;

			while ((i >= 0) && (buf[i] <= ' ')) i--;
			buf[++i]='\n'; buf[++i]='\0';

			if (i != 65) end=1;
			if (strncmp(buf,"-----END ",9) == 0)
				break;
			if (i > 65) break;
			if (!BUF_MEM_grow_clean(dataB,i+bl+9))
				{
				PEMerr(PEM_F_PEM_READ_BIO,ERR_R_MALLOC_FAILURE);
				goto err;
				}
			memcpy(&(dataB->data[bl]),buf,i);
			dataB->data[bl+i]='\0';
			bl+=i;
			if (end)
				{
				buf[0]='\0';
				i=BIO_gets(bp,buf,254);
				if (i <= 0) break;

				while ((i >= 0) && (buf[i] <= ' ')) i--;
				buf[++i]='\n'; buf[++i]='\0';

				break;
				}
			}
		}
	else
		{
		tmpB=headerB;
		headerB=dataB;
		dataB=tmpB;
		bl=hl;
		}
	i=strlen(nameB->data);
	if (	(strncmp(buf,"-----END ",9) != 0) ||
		(strncmp(nameB->data,&(buf[9]),i) != 0) ||
		(strncmp(&(buf[9+i]),"-----\n",6) != 0))
		{
		PEMerr(PEM_F_PEM_READ_BIO,PEM_R_BAD_END_LINE);
		goto err;
		}

	EVP_DecodeInit(&ctx);
	i=EVP_DecodeUpdate(&ctx,
		(unsigned char *)dataB->data,&bl,
		(unsigned char *)dataB->data,bl);
	if (i < 0)
		{
		PEMerr(PEM_F_PEM_READ_BIO,PEM_R_BAD_BASE64_DECODE);
		goto err;
		}
	i=EVP_DecodeFinal(&ctx,(unsigned char *)&(dataB->data[bl]),&k);
	if (i < 0)
		{
		PEMerr(PEM_F_PEM_READ_BIO,PEM_R_BAD_BASE64_DECODE);
		goto err;
		}
	bl+=k;

	if (bl == 0) goto err;
	*name=nameB->data;
	*header=headerB->data;
	*data=(unsigned char *)dataB->data;
	*len=bl;
	OPENSSL_free(nameB);
	OPENSSL_free(headerB);
	OPENSSL_free(dataB);
	return(1);
err:
	BUF_MEM_free(nameB);
	BUF_MEM_free(headerB);
	BUF_MEM_free(dataB);
	return(0);
	}