/* * This code implements the MD5 message-digest algorithm. * The algorithm is due to Ron Rivest. This code was * written by Colin Plumb in 1993, no copyright is claimed. * This code is in the public domain; do with it what you wish. * * Equivalent code is available from RSA Data Security, Inc. * This code has been tested against that, and is equivalent, * except that you don't need to include two pages of legalese * with every copy. * * To compute the message digest of a chunk of bytes, declare an * MD5Context structure, pass it to MD5Init, call MD5Update as * needed on buffers full of bytes, and then call MD5Final, which * will fill a supplied 16-byte array with the digest. * * Changed so as no longer to depend on Colin Plumb's `usual.h' header * definitions * - Ian Jackson <[email protected]>. * Still in the public domain. */ #include <string.h> /* for memcpy() */ #include "md5_utils.h" #include "vpx_ports/compiler_attributes.h" static void byteSwap(UWORD32 *buf, unsigned words) { … } /* * Start MD5 accumulation. Set bit count to 0 and buffer to mysterious * initialization constants. */ void MD5Init(struct MD5Context *ctx) { … } /* * Update context to reflect the concatenation of another buffer full * of bytes. */ void MD5Update(struct MD5Context *ctx, md5byte const *buf, unsigned len) { … } /* * Final wrapup - pad to 64-byte boundary with the bit pattern * 1 0* (64-bit count of bits processed, MSB-first) */ void MD5Final(md5byte digest[16], struct MD5Context *ctx) { … } #ifndef ASM_MD5 /* The four core functions - F1 is optimized somewhat */ /* #define F1(x, y, z) (x & y | ~x & z) */ #define F1(x, y, z) … #define F2(x, y, z) … #define F3(x, y, z) … #define F4(x, y, z) … /* This is the central step in the MD5 algorithm. */ #define MD5STEP(f, w, x, y, z, in, s) … /* * 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. */ VPX_NO_UNSIGNED_OVERFLOW_CHECK VPX_NO_UNSIGNED_SHIFT_CHECK void MD5Transform( UWORD32 buf[4], UWORD32 const in[16]) { … } #endif
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