Android 5.0 Lollipop dlopen(RTLD_LAZY) 失败 : dlopen failed: cannot locate symbol "MD5_Init"

Question

我在 channelReceiver.c 中使用 md5使用 jni 文件

MD5_CTX td; 
MD5_Init(&td);
block = malloc(176);
MD5_Update(&td, block, 176);
MD5_Final(md5_result, &td);

当我在 android 5.0 lollipop 中运行我的应用程序时，我发现了一个奇怪的问题，我发现了这个错误

dlopen("libchannelReceiver.so", RTLD_LAZY) failed: dlopen failed: cannot locate symbol "MD5_Init" referenced by libchannelReceiver.so

在 Lollipop 版本之前它工作正常。

所以我正在尝试 #include <openssl/md5.h>在 channelReceiver.c , 但我在这里发现了一些其他问题

fatal error: openssl/md5.h: No such file or directory #include <openssl/md5.h>

我正在使用 Ubuntu 14.04

Answer 1

当我们在 Android Lollipop 中运行时解决了这个问题，从中删除了 MD5，因此我们必须将此源代码放入我们的应用程序包中。创建 md5.h 和 md5.c

md5.h

 #ifndef MD5_H
 #define MD5_H

 #ifdef HAVE_CONFIG_H
 #  include <config.h>
 #endif

 #include <sys/types.h>

 #define MD5_HASHBYTES 16

 typedef struct MD5Context {
         u_int32_t buf[4];
         u_int32_t bits[2];
         unsigned char in[64];
 } MD5_CTX;

 char* lutil_md5_file(const char *filename, char *buf);
 char* lutil_md5_data(const unsigned char *data, unsigned int len, char *buf);

 #endif /* MD5_H */

md5.c

#ifdef HAVE_CONFIG_H
 #  include <config.h>
 #endif

 #include <sys/types.h>
 #include <fcntl.h>
 #include <unistd.h>
 #include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>

 #include "md5.h"
 #ifdef WITH_DMALLOC
 #  include <dmalloc.h>
 #endif

 static void MD5Init(MD5_CTX *context);
 static void MD5Update(MD5_CTX *context, unsigned char const *buf, unsigned len);
 static void MD5Final(unsigned char digest[MD5_HASHBYTES], MD5_CTX *context);
 static void MD5Transform(u_int32_t buf[4], u_int32_t const in[16]);
 static char* MD5End(MD5_CTX *, char *);


 #if __BYTE_ORDER == 1234
 #define byteReverse(buf, len)   /* Nothing */
 #else
 void byteReverse(unsigned char *buf, unsigned longs);

 /*
  * Note: this code is harmless on little-endian machines.
  */
 void byteReverse(unsigned char *buf, unsigned longs)
 {
     u_int32_t t;
     do {
         t = (u_int32_t) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
             ((unsigned) buf[1] << 8 | buf[0]);
         *(u_int32_t *) buf = t;
         buf += 4;
     } while (--longs);
 }
 #endif /* ! __BYTE_ORDER == 1234 */




 char *
 lutil_md5_file (const char *filename, char *buf)
 {
     unsigned char buffer[BUFSIZ]; 
     MD5_CTX ctx;
     int f,i,j;

     MD5Init(&ctx);
     f = open(filename,O_RDONLY);
     if (f < 0) return 0;
     while ((i = read(f,buffer,sizeof buffer)) > 0) {
                 MD5Update(&ctx,buffer,i);
     }
     j = errno;
     close(f);
     errno = j;
     if (i < 0) return 0;
     return MD5End(&ctx, buf);
 }

 char *
 lutil_md5_data (const unsigned char *data, unsigned int len, char *buf)
 {
     MD5_CTX ctx;

     MD5Init(&ctx);
     MD5Update(&ctx,data,len);
     return MD5End(&ctx, buf);
 }


 /* Non-Interface Methods */

 /* from md5hl.c */

 char *
 MD5End(MD5_CTX *ctx, char *buf)
 {
     int i;
     unsigned char digest[MD5_HASHBYTES];
     static const char hex[]="0123456789abcdef";

     if (!buf)
         buf = malloc(33);
     if (!buf)
         return 0;
     MD5Final(digest,ctx);
     for (i=0;i<MD5_HASHBYTES;i++) {
         buf[i+i] = hex[digest[i] >> 4];
         buf[i+i+1] = hex[digest[i] & 0x0f];
     }
     buf[i+i] = '\0';
     return buf;
 }

 /*
  * Start MD5 accumulation.  Set bit count to 0 and buffer to mysterious
  * initialization constants.
  */
 void MD5Init(MD5_CTX *ctx)
 {
     ctx->buf[0] = 0x67452301;
     ctx->buf[1] = 0xefcdab89;
     ctx->buf[2] = 0x98badcfe;
     ctx->buf[3] = 0x10325476;

     ctx->bits[0] = 0;
     ctx->bits[1] = 0;
 }

 /*
  * Update context to reflect the concatenation of another buffer full
  * of bytes.
  */
 void MD5Update(MD5_CTX *ctx, unsigned char const *buf, unsigned len)
 {
     u_int32_t t;

     /* Update bitcount */

     t = ctx->bits[0];
     if ((ctx->bits[0] = t + ((u_int32_t) len << 3)) < t)
         ctx->bits[1]++;         /* Carry from low to high */
     ctx->bits[1] += len >> 29;

     t = (t >> 3) & 0x3f;        /* Bytes already in shsInfo->data */

     /* Handle any leading odd-sized chunks */

     if (t) {
         unsigned char *p = (unsigned char *) ctx->in + t;

         t = 64 - t;
         if (len < t) {
             memcpy(p, buf, len);
             return;
         }
         memcpy(p, buf, t);
         byteReverse(ctx->in, 16);
         MD5Transform(ctx->buf, (u_int32_t *) ctx->in);
         buf += t;
         len -= t;
     }
     /* Process data in 64-byte chunks */

     while (len >= 64) {
         memcpy(ctx->in, buf, 64);
         byteReverse(ctx->in, 16);
         MD5Transform(ctx->buf, (u_int32_t *) ctx->in);
         buf += 64;
         len -= 64;
     }

     /* Handle any remaining bytes of data. */

     memcpy(ctx->in, buf, len);
 }

 /*
  * Final wrapup - pad to 64-byte boundary with the bit pattern 
  * 1 0* (64-bit count of bits processed, MSB-first)
  */
 void MD5Final(unsigned char digest[16], MD5_CTX *ctx)
 {
     unsigned count;
     unsigned char *p;

     /* Compute number of bytes mod 64 */
     count = (ctx->bits[0] >> 3) & 0x3F;

     /* Set the first char of padding to 0x80.  This is safe since there is
        always at least one byte free */
     p = ctx->in + count;
     *p++ = 0x80;

     /* Bytes of padding needed to make 64 bytes */
     count = 64 - 1 - count;

     /* Pad out to 56 mod 64 */
     if (count < 8) {
         /* Two lots of padding:  Pad the first block to 64 bytes */
         memset(p, 0, count);
         byteReverse(ctx->in, 16);
         MD5Transform(ctx->buf, (u_int32_t *) ctx->in);

         /* Now fill the next block with 56 bytes */
         memset(ctx->in, 0, 56);
     } else {
         /* Pad block to 56 bytes */
         memset(p, 0, count - 8);
     }
     byteReverse(ctx->in, 14);

     /* Append length in bits and transform */
     ((u_int32_t *) ctx->in)[14] = ctx->bits[0];
     ((u_int32_t *) ctx->in)[15] = ctx->bits[1];

     MD5Transform(ctx->buf, (u_int32_t *) ctx->in);
     byteReverse((unsigned char *) ctx->buf, 4);
     memcpy(digest, ctx->buf, 16);
     memset((char *) ctx, 0, sizeof(ctx));       /* In case it's sensitive */
 }

 /* The four core functions - F1 is optimized somewhat */

 /* #define F1(x, y, z) (x & y | ~x & z) */
 #define F1(x, y, z) (z ^ (x & (y ^ z)))
 #define F2(x, y, z) F1(z, x, y)
 #define F3(x, y, z) (x ^ y ^ z)
 #define F4(x, y, z) (y ^ (x | ~z))

 /* This is the central step in the MD5 algorithm. */
 #define MD5STEP(f, w, x, y, z, data, s) \
         ( w += f(x, y, z) + data,  w = w<<s | w>>(32-s),  w += x )

 /*
  * The core of the MD5 algorithm, this alters an existing MD5 hash to
  * reflect the addition of 16 longwords of new data.  MD5Update blocks
  * the data and converts bytes into longwords for this routine.
  */
 void MD5Transform(u_int32_t buf[4], u_int32_t const in[16])
 {
     register u_int32_t a, b, c, d;

     a = buf[0];
     b = buf[1];
     c = buf[2];
     d = buf[3];

     MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
     MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
     MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
     MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
     MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
     MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
     MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
     MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
     MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
     MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
     MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
     MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
     MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
     MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
     MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
     MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);

     MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
     MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
     MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
     MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
     MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
     MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
     MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
     MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
     MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
     MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
     MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
     MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
     MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
     MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
     MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
     MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);

     MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
     MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
     MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
     MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
     MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
     MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
     MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
     MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
     MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
     MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
     MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
     MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
     MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
     MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
     MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
     MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);

     MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
     MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
     MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
     MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
     MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
     MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
     MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
     MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
     MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
     MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
     MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
     MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
     MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
     MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
     MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
     MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);

     buf[0] += a;
     buf[1] += b;
     buf[2] += c;
     buf[3] += d;
 }

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