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Annotation of qemu/roms/ipxe/src/crypto/md5.c, revision 1.1

1.1     ! root        1: /* 
        !             2:  * Cryptographic API.
        !             3:  *
        !             4:  * MD5 Message Digest Algorithm (RFC1321).
        !             5:  *
        !             6:  * Derived from cryptoapi implementation, originally based on the
        !             7:  * public domain implementation written by Colin Plumb in 1993.
        !             8:  *
        !             9:  * Reduced object size by around 50% compared to the original Linux
        !            10:  * version for use in Etherboot by Michael Brown.
        !            11:  *
        !            12:  * Copyright (c) Cryptoapi developers.
        !            13:  * Copyright (c) 2002 James Morris <[email protected]>
        !            14:  * Copyright (c) 2006 Michael Brown <[email protected]>
        !            15:  * 
        !            16:  * This program is free software; you can redistribute it and/or modify it
        !            17:  * under the terms of the GNU General Public License as published by the Free
        !            18:  * Software Foundation; either version 2 of the License, or (at your option) 
        !            19:  * any later version.
        !            20:  *
        !            21:  */
        !            22: 
        !            23: FILE_LICENCE ( GPL2_OR_LATER );
        !            24: 
        !            25: #include <stdint.h>
        !            26: #include <string.h>
        !            27: #include <byteswap.h>
        !            28: #include <ipxe/crypto.h>
        !            29: #include <ipxe/md5.h>
        !            30: 
        !            31: struct md5_step {
        !            32:        u32 ( * f ) ( u32 b, u32 c, u32 d );
        !            33:        u8 coefficient;
        !            34:        u8 constant;
        !            35: };
        !            36: 
        !            37: static u32 f1(u32 b, u32 c, u32 d)
        !            38: {
        !            39:        return ( d ^ ( b & ( c ^ d ) ) );
        !            40: }
        !            41: 
        !            42: static u32 f2(u32 b, u32 c, u32 d)
        !            43: {
        !            44:        return ( c ^ ( d & ( b ^ c ) ) );
        !            45: }
        !            46: 
        !            47: static u32 f3(u32 b, u32 c, u32 d)
        !            48: {
        !            49:        return ( b ^ c ^ d );
        !            50: }
        !            51: 
        !            52: static u32 f4(u32 b, u32 c, u32 d)
        !            53: {
        !            54:        return ( c ^ ( b | ~d ) );
        !            55: }
        !            56: 
        !            57: static struct md5_step md5_steps[4] = {
        !            58:        {
        !            59:                .f = f1,
        !            60:                .coefficient = 1,
        !            61:                .constant = 0,
        !            62:        },
        !            63:        {
        !            64:                .f = f2,
        !            65:                .coefficient = 5,
        !            66:                .constant = 1,
        !            67:        },
        !            68:        {
        !            69:                .f = f3,
        !            70:                .coefficient = 3,
        !            71:                .constant = 5,
        !            72:        },
        !            73:        {
        !            74:                .f = f4,
        !            75:                .coefficient = 7,
        !            76:                .constant = 0,
        !            77:        }
        !            78: };
        !            79: 
        !            80: static const u8 r[64] = {
        !            81:        7,12,17,22,7,12,17,22,7,12,17,22,7,12,17,22,
        !            82:        5,9,14,20,5,9,14,20,5,9,14,20,5,9,14,20,
        !            83:        4,11,16,23,4,11,16,23,4,11,16,23,4,11,16,23,
        !            84:        6,10,15,21,6,10,15,21,6,10,15,21,6,10,15,21
        !            85: };
        !            86: 
        !            87: static const u32 k[64] = {
        !            88:        0xd76aa478UL, 0xe8c7b756UL, 0x242070dbUL, 0xc1bdceeeUL,
        !            89:        0xf57c0fafUL, 0x4787c62aUL, 0xa8304613UL, 0xfd469501UL,
        !            90:        0x698098d8UL, 0x8b44f7afUL, 0xffff5bb1UL, 0x895cd7beUL,
        !            91:        0x6b901122UL, 0xfd987193UL, 0xa679438eUL, 0x49b40821UL,
        !            92:        0xf61e2562UL, 0xc040b340UL, 0x265e5a51UL, 0xe9b6c7aaUL,
        !            93:        0xd62f105dUL, 0x02441453UL, 0xd8a1e681UL, 0xe7d3fbc8UL,
        !            94:        0x21e1cde6UL, 0xc33707d6UL, 0xf4d50d87UL, 0x455a14edUL,
        !            95:        0xa9e3e905UL, 0xfcefa3f8UL, 0x676f02d9UL, 0x8d2a4c8aUL,
        !            96:        0xfffa3942UL, 0x8771f681UL, 0x6d9d6122UL, 0xfde5380cUL,
        !            97:        0xa4beea44UL, 0x4bdecfa9UL, 0xf6bb4b60UL, 0xbebfbc70UL,
        !            98:        0x289b7ec6UL, 0xeaa127faUL, 0xd4ef3085UL, 0x04881d05UL,
        !            99:        0xd9d4d039UL, 0xe6db99e5UL, 0x1fa27cf8UL, 0xc4ac5665UL,
        !           100:        0xf4292244UL, 0x432aff97UL, 0xab9423a7UL, 0xfc93a039UL,
        !           101:        0x655b59c3UL, 0x8f0ccc92UL, 0xffeff47dUL, 0x85845dd1UL,
        !           102:        0x6fa87e4fUL, 0xfe2ce6e0UL, 0xa3014314UL, 0x4e0811a1UL,
        !           103:        0xf7537e82UL, 0xbd3af235UL, 0x2ad7d2bbUL, 0xeb86d391UL,
        !           104: };
        !           105: 
        !           106: static void md5_transform(u32 *hash, const u32 *in)
        !           107: {
        !           108:        u32 a, b, c, d, f, g, temp;
        !           109:        int i;
        !           110:        struct md5_step *step;
        !           111: 
        !           112:        a = hash[0];
        !           113:        b = hash[1];
        !           114:        c = hash[2];
        !           115:        d = hash[3];
        !           116: 
        !           117:        for ( i = 0 ; i < 64 ; i++ ) {
        !           118:                step = &md5_steps[i >> 4];
        !           119:                f = step->f ( b, c, d );
        !           120:                g = ( ( i * step->coefficient + step->constant ) & 0xf );
        !           121:                temp = d;
        !           122:                d = c;
        !           123:                c = b;
        !           124:                a += ( f + k[i] + in[g] );
        !           125:                a = ( ( a << r[i] ) | ( a >> ( 32-r[i] ) ) );
        !           126:                b += a;
        !           127:                a = temp;
        !           128:        }
        !           129: 
        !           130:        hash[0] += a;
        !           131:        hash[1] += b;
        !           132:        hash[2] += c;
        !           133:        hash[3] += d;
        !           134: }
        !           135: 
        !           136: /* XXX: this stuff can be optimized */
        !           137: static inline void le32_to_cpu_array(u32 *buf, unsigned int words)
        !           138: {
        !           139:        while (words--) {
        !           140:                le32_to_cpus(buf);
        !           141:                buf++;
        !           142:        }
        !           143: }
        !           144: 
        !           145: static inline void cpu_to_le32_array(u32 *buf, unsigned int words)
        !           146: {
        !           147:        while (words--) {
        !           148:                cpu_to_le32s(buf);
        !           149:                buf++;
        !           150:        }
        !           151: }
        !           152: 
        !           153: static inline void md5_transform_helper(struct md5_ctx *ctx)
        !           154: {
        !           155:        le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(u32));
        !           156:        md5_transform(ctx->hash, ctx->block);
        !           157: }
        !           158: 
        !           159: static void md5_init(void *context)
        !           160: {
        !           161:        struct md5_ctx *mctx = context;
        !           162: 
        !           163:        mctx->hash[0] = 0x67452301;
        !           164:        mctx->hash[1] = 0xefcdab89;
        !           165:        mctx->hash[2] = 0x98badcfe;
        !           166:        mctx->hash[3] = 0x10325476;
        !           167:        mctx->byte_count = 0;
        !           168: }
        !           169: 
        !           170: static void md5_update(void *context, const void *data, size_t len)
        !           171: {
        !           172:        struct md5_ctx *mctx = context;
        !           173:        const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
        !           174: 
        !           175:        mctx->byte_count += len;
        !           176: 
        !           177:        if (avail > len) {
        !           178:                memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
        !           179:                       data, len);
        !           180:                return;
        !           181:        }
        !           182: 
        !           183:        memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
        !           184:               data, avail);
        !           185: 
        !           186:        md5_transform_helper(mctx);
        !           187:        data += avail;
        !           188:        len -= avail;
        !           189: 
        !           190:        while (len >= sizeof(mctx->block)) {
        !           191:                memcpy(mctx->block, data, sizeof(mctx->block));
        !           192:                md5_transform_helper(mctx);
        !           193:                data += sizeof(mctx->block);
        !           194:                len -= sizeof(mctx->block);
        !           195:        }
        !           196: 
        !           197:        memcpy(mctx->block, data, len);
        !           198: }
        !           199: 
        !           200: static void md5_final(void *context, void *out)
        !           201: {
        !           202:        struct md5_ctx *mctx = context;
        !           203:        const unsigned int offset = mctx->byte_count & 0x3f;
        !           204:        char *p = (char *)mctx->block + offset;
        !           205:        int padding = 56 - (offset + 1);
        !           206: 
        !           207:        *p++ = 0x80;
        !           208:        if (padding < 0) {
        !           209:                memset(p, 0x00, padding + sizeof (u64));
        !           210:                md5_transform_helper(mctx);
        !           211:                p = (char *)mctx->block;
        !           212:                padding = 56;
        !           213:        }
        !           214: 
        !           215:        memset(p, 0, padding);
        !           216:        mctx->block[14] = mctx->byte_count << 3;
        !           217:        mctx->block[15] = mctx->byte_count >> 29;
        !           218:        le32_to_cpu_array(mctx->block, (sizeof(mctx->block) -
        !           219:                          sizeof(u64)) / sizeof(u32));
        !           220:        md5_transform(mctx->hash, mctx->block);
        !           221:        cpu_to_le32_array(mctx->hash, sizeof(mctx->hash) / sizeof(u32));
        !           222:        memcpy(out, mctx->hash, sizeof(mctx->hash));
        !           223:        memset(mctx, 0, sizeof(*mctx));
        !           224: }
        !           225: 
        !           226: struct digest_algorithm md5_algorithm = {
        !           227:        .name           = "md5",
        !           228:        .ctxsize        = MD5_CTX_SIZE,
        !           229:        .blocksize      = ( MD5_BLOCK_WORDS * 4 ),
        !           230:        .digestsize     = MD5_DIGEST_SIZE,
        !           231:        .init           = md5_init,
        !           232:        .update         = md5_update,
        !           233:        .final          = md5_final,
        !           234: };

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