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Fix md5 calculaton on blocks larger then 2^32. Bug reproduced and debugged by Serge Belyshev. Patch by Paul Eggert.

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Con Kolivas 2012-05-19 14:50:15 +10:00
parent a9ba55fe61
commit 9430b6ff4a
1 changed files with 3 additions and 3 deletions
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6
md5.c
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@ -322,13 +322,13 @@ md5_process_block (const void *buffer, size_t len, struct md5_ctx *ctx)
uint32_t B = ctx->B; uint32_t B = ctx->B;
uint32_t C = ctx->C; uint32_t C = ctx->C;
uint32_t D = ctx->D; uint32_t D = ctx->D;
uint32_t lolen = len;
/* First increment the byte count. RFC 1321 specifies the possible /* First increment the byte count. RFC 1321 specifies the possible
length of the file up to 2^64 bits. Here we only compute the length of the file up to 2^64 bits. Here we only compute the
number of bytes. Do a double word increment. */ number of bytes. Do a double word increment. */
ctx->total[0] += len; ctx->total[0] += lolen;
if (ctx->total[0] < len) ctx->total[1] += (len >> 31 >> 1) + (ctx->total[0] < lolen);
++ctx->total[1];
/* Process all bytes in the buffer with 64 bytes in each round of /* Process all bytes in the buffer with 64 bytes in each round of
the loop. */ the loop. */