基于C语言实现的aes256加密算法示例
本文实例讲述了基于C语言实现的aes256加密算法。分享给大家供大家参考,具体如下:
aes256.h:
#ifndefuint8_t #defineuint8_tunsignedchar #endif #ifdef__cplusplus extern"C"{ #endif typedefstruct{ uint8_tkey[32]; uint8_tenckey[32]; uint8_tdeckey[32]; }aes256_context; voidaes256_init(aes256_context*,uint8_t*); voidaes256_done(aes256_context*); voidaes256_encrypt_ecb(aes256_context*,uint8_t*); voidaes256_decrypt_ecb(aes256_context*,uint8_t*); #ifdef__cplusplus } #endif
aes256.c:
#include"aes256.h" #defineF(x)(((x)<<1)^((((x)>>7)&1)*0x1b)) #defineFD(x)(((x)>>1)^(((x)&1)?0x8d:0)) //#defineBACK_TO_TABLES #ifdefBACK_TO_TABLES constuint8_tsbox[256]={ 0x63,0x7c,0x77,0x7b,0xf2,0x6b,0x6f,0xc5, 0x30,0x01,0x67,0x2b,0xfe,0xd7,0xab,0x76, 0xca,0x82,0xc9,0x7d,0xfa,0x59,0x47,0xf0, 0xad,0xd4,0xa2,0xaf,0x9c,0xa4,0x72,0xc0, 0xb7,0xfd,0x93,0x26,0x36,0x3f,0xf7,0xcc, 0x34,0xa5,0xe5,0xf1,0x71,0xd8,0x31,0x15, 0x04,0xc7,0x23,0xc3,0x18,0x96,0x05,0x9a, 0x07,0x12,0x80,0xe2,0xeb,0x27,0xb2,0x75, 0x09,0x83,0x2c,0x1a,0x1b,0x6e,0x5a,0xa0, 0x52,0x3b,0xd6,0xb3,0x29,0xe3,0x2f,0x84, 0x53,0xd1,0x00,0xed,0x20,0xfc,0xb1,0x5b, 0x6a,0xcb,0xbe,0x39,0x4a,0x4c,0x58,0xcf, 0xd0,0xef,0xaa,0xfb,0x43,0x4d,0x33,0x85, 0x45,0xf9,0x02,0x7f,0x50,0x3c,0x9f,0xa8, 0x51,0xa3,0x40,0x8f,0x92,0x9d,0x38,0xf5, 0xbc,0xb6,0xda,0x21,0x10,0xff,0xf3,0xd2, 0xcd,0x0c,0x13,0xec,0x5f,0x97,0x44,0x17, 0xc4,0xa7,0x7e,0x3d,0x64,0x5d,0x19,0x73, 0x60,0x81,0x4f,0xdc,0x22,0x2a,0x90,0x88, 0x46,0xee,0xb8,0x14,0xde,0x5e,0x0b,0xdb, 0xe0,0x32,0x3a,0x0a,0x49,0x06,0x24,0x5c, 0xc2,0xd3,0xac,0x62,0x91,0x95,0xe4,0x79, 0xe7,0xc8,0x37,0x6d,0x8d,0xd5,0x4e,0xa9, 0x6c,0x56,0xf4,0xea,0x65,0x7a,0xae,0x08, 0xba,0x78,0x25,0x2e,0x1c,0xa6,0xb4,0xc6, 0xe8,0xdd,0x74,0x1f,0x4b,0xbd,0x8b,0x8a, 0x70,0x3e,0xb5,0x66,0x48,0x03,0xf6,0x0e, 0x61,0x35,0x57,0xb9,0x86,0xc1,0x1d,0x9e, 0xe1,0xf8,0x98,0x11,0x69,0xd9,0x8e,0x94, 0x9b,0x1e,0x87,0xe9,0xce,0x55,0x28,0xdf, 0x8c,0xa1,0x89,0x0d,0xbf,0xe6,0x42,0x68, 0x41,0x99,0x2d,0x0f,0xb0,0x54,0xbb,0x16 }; constuint8_tsboxinv[256]={ 0x52,0x09,0x6a,0xd5,0x30,0x36,0xa5,0x38, 0xbf,0x40,0xa3,0x9e,0x81,0xf3,0xd7,0xfb, 0x7c,0xe3,0x39,0x82,0x9b,0x2f,0xff,0x87, 0x34,0x8e,0x43,0x44,0xc4,0xde,0xe9,0xcb, 0x54,0x7b,0x94,0x32,0xa6,0xc2,0x23,0x3d, 0xee,0x4c,0x95,0x0b,0x42,0xfa,0xc3,0x4e, 0x08,0x2e,0xa1,0x66,0x28,0xd9,0x24,0xb2, 0x76,0x5b,0xa2,0x49,0x6d,0x8b,0xd1,0x25, 0x72,0xf8,0xf6,0x64,0x86,0x68,0x98,0x16, 0xd4,0xa4,0x5c,0xcc,0x5d,0x65,0xb6,0x92, 0x6c,0x70,0x48,0x50,0xfd,0xed,0xb9,0xda, 0x5e,0x15,0x46,0x57,0xa7,0x8d,0x9d,0x84, 0x90,0xd8,0xab,0x00,0x8c,0xbc,0xd3,0x0a, 0xf7,0xe4,0x58,0x05,0xb8,0xb3,0x45,0x06, 0xd0,0x2c,0x1e,0x8f,0xca,0x3f,0x0f,0x02, 0xc1,0xaf,0xbd,0x03,0x01,0x13,0x8a,0x6b, 0x3a,0x91,0x11,0x41,0x4f,0x67,0xdc,0xea, 0x97,0xf2,0xcf,0xce,0xf0,0xb4,0xe6,0x73, 0x96,0xac,0x74,0x22,0xe7,0xad,0x35,0x85, 0xe2,0xf9,0x37,0xe8,0x1c,0x75,0xdf,0x6e, 0x47,0xf1,0x1a,0x71,0x1d,0x29,0xc5,0x89, 0x6f,0xb7,0x62,0x0e,0xaa,0x18,0xbe,0x1b, 0xfc,0x56,0x3e,0x4b,0xc6,0xd2,0x79,0x20, 0x9a,0xdb,0xc0,0xfe,0x78,0xcd,0x5a,0xf4, 0x1f,0xdd,0xa8,0x33,0x88,0x07,0xc7,0x31, 0xb1,0x12,0x10,0x59,0x27,0x80,0xec,0x5f, 0x60,0x51,0x7f,0xa9,0x19,0xb5,0x4a,0x0d, 0x2d,0xe5,0x7a,0x9f,0x93,0xc9,0x9c,0xef, 0xa0,0xe0,0x3b,0x4d,0xae,0x2a,0xf5,0xb0, 0xc8,0xeb,0xbb,0x3c,0x83,0x53,0x99,0x61, 0x17,0x2b,0x04,0x7e,0xba,0x77,0xd6,0x26, 0xe1,0x69,0x14,0x63,0x55,0x21,0x0c,0x7d }; #definerj_sbox(x)sbox[(x)] #definerj_sbox_inv(x)sboxinv[(x)] #else uint8_tgf_alog(uint8_tx)//calculateanti-logarithmgen3 { uint8_tatb=1,z; while(x--){z=atb;atb<<=1;if(z&0x80)atb^=0x1b;atb^=z;} returnatb; } uint8_tgf_log(uint8_tx)//calculatelogarithmgen3 { uint8_tatb=1,i=0,z; do{ if(atb==x)break; z=atb;atb<<=1;if(z&0x80)atb^=0x1b;atb^=z; }while(++i>0); returni; } uint8_tgf_mulinv(uint8_tx)//calculatemultiplicativeinverse { return(x)?gf_alog(255-gf_log(x)):0; } uint8_trj_sbox(uint8_tx) { uint8_ty,sb; sb=y=gf_mulinv(x); y=(y<<1)|(y>>7);sb^=y;y=(y<<1)|(y>>7);sb^=y; y=(y<<1)|(y>>7);sb^=y;y=(y<<1)|(y>>7);sb^=y; return(sb^0x63); } uint8_trj_sbox_inv(uint8_tx) { uint8_ty,sb; y=x^0x63; sb=y=(y<<1)|(y>>7); y=(y<<2)|(y>>6);sb^=y;y=(y<<3)|(y>>5);sb^=y; returngf_mulinv(sb); } #endif uint8_trj_xtime(uint8_tx) { return(x&0x80)?((x<<1)^0x1b):(x<<1); } voidaes_subBytes(uint8_t*buf) { registeruint8_ti=16; while(i--)buf[i]=rj_sbox(buf[i]); } voidaes_subBytes_inv(uint8_t*buf) { registeruint8_ti=16; while(i--)buf[i]=rj_sbox_inv(buf[i]); } voidaes_addRoundKey(uint8_t*buf,uint8_t*key) { registeruint8_ti=16; while(i--)buf[i]^=key[i]; } voidaes_addRoundKey_cpy(uint8_t*buf,uint8_t*key,uint8_t*cpk) { registeruint8_ti=16; while(i--)buf[i]^=(cpk[i]=key[i]),cpk[16+i]=key[16+i]; } voidaes_shiftRows(uint8_t*buf) { registeruint8_ti,j; i=buf[1];buf[1]=buf[5];buf[5]=buf[9];buf[9]=buf[13];buf[13]=i; i=buf[10];buf[10]=buf[2];buf[2]=i; j=buf[3];buf[3]=buf[15];buf[15]=buf[11];buf[11]=buf[7];buf[7]=j; j=buf[14];buf[14]=buf[6];buf[6]=j; } voidaes_shiftRows_inv(uint8_t*buf) { registeruint8_ti,j; i=buf[1];buf[1]=buf[13];buf[13]=buf[9];buf[9]=buf[5];buf[5]=i; i=buf[2];buf[2]=buf[10];buf[10]=i; j=buf[3];buf[3]=buf[7];buf[7]=buf[11];buf[11]=buf[15];buf[15]=j; j=buf[6];buf[6]=buf[14];buf[14]=j; } voidaes_mixColumns(uint8_t*buf) { registeruint8_ti,a,b,c,d,e; for(i=0;i<16;i+=4) { a=buf[i];b=buf[i+1];c=buf[i+2];d=buf[i+3]; e=a^b^c^d; buf[i]^=e^rj_xtime(a^b);buf[i+1]^=e^rj_xtime(b^c); buf[i+2]^=e^rj_xtime(c^d);buf[i+3]^=e^rj_xtime(d^a); } } voidaes_mixColumns_inv(uint8_t*buf) { registeruint8_ti,a,b,c,d,e,x,y,z; for(i=0;i<16;i+=4) { a=buf[i];b=buf[i+1];c=buf[i+2];d=buf[i+3]; e=a^b^c^d; z=rj_xtime(e); x=e^rj_xtime(rj_xtime(z^a^c));y=e^rj_xtime(rj_xtime(z^b^d)); buf[i]^=x^rj_xtime(a^b);buf[i+1]^=y^rj_xtime(b^c); buf[i+2]^=x^rj_xtime(c^d);buf[i+3]^=y^rj_xtime(d^a); } } voidaes_expandEncKey(uint8_t*k,uint8_t*rc) { registeruint8_ti; k[0]^=rj_sbox(k[29])^(*rc); k[1]^=rj_sbox(k[30]); k[2]^=rj_sbox(k[31]); k[3]^=rj_sbox(k[28]); *rc=F(*rc); for(i=4;i<16;i+=4)k[i]^=k[i-4],k[i+1]^=k[i-3], k[i+2]^=k[i-2],k[i+3]^=k[i-1]; k[16]^=rj_sbox(k[12]); k[17]^=rj_sbox(k[13]); k[18]^=rj_sbox(k[14]); k[19]^=rj_sbox(k[15]); for(i=20;i<32;i+=4)k[i]^=k[i-4],k[i+1]^=k[i-3], k[i+2]^=k[i-2],k[i+3]^=k[i-1]; } voidaes_expandDecKey(uint8_t*k,uint8_t*rc) { uint8_ti; for(i=28;i>16;i-=4)k[i+0]^=k[i-4],k[i+1]^=k[i-3], k[i+2]^=k[i-2],k[i+3]^=k[i-1]; k[16]^=rj_sbox(k[12]); k[17]^=rj_sbox(k[13]); k[18]^=rj_sbox(k[14]); k[19]^=rj_sbox(k[15]); for(i=12;i>0;i-=4)k[i+0]^=k[i-4],k[i+1]^=k[i-3], k[i+2]^=k[i-2],k[i+3]^=k[i-1]; *rc=FD(*rc); k[0]^=rj_sbox(k[29])^(*rc); k[1]^=rj_sbox(k[30]); k[2]^=rj_sbox(k[31]); k[3]^=rj_sbox(k[28]); } voidaes256_init(aes256_context*ctx,uint8_t*k) { uint8_trcon=1; registeruint8_ti; for(i=0;i<sizeof(ctx->key);i++)ctx->enckey[i]=ctx->deckey[i]=k[i]; for(i=8;--i;)aes_expandEncKey(ctx->deckey,&rcon); } voidaes256_done(aes256_context*ctx) { registeruint8_ti; for(i=0;i<sizeof(ctx->key);i++) ctx->key[i]=ctx->enckey[i]=ctx->deckey[i]=0; } voidaes256_encrypt_ecb(aes256_context*ctx,uint8_t*buf) { uint8_ti,rcon; aes_addRoundKey_cpy(buf,ctx->enckey,ctx->key); for(i=1,rcon=1;i<14;++i) { aes_subBytes(buf); aes_shiftRows(buf); aes_mixColumns(buf); if(i&1)aes_addRoundKey(buf,&ctx->key[16]); elseaes_expandEncKey(ctx->key,&rcon),aes_addRoundKey(buf,ctx->key); } aes_subBytes(buf); aes_shiftRows(buf); aes_expandEncKey(ctx->key,&rcon); aes_addRoundKey(buf,ctx->key); } voidaes256_decrypt_ecb(aes256_context*ctx,uint8_t*buf) { uint8_ti,rcon; aes_addRoundKey_cpy(buf,ctx->deckey,ctx->key); aes_shiftRows_inv(buf); aes_subBytes_inv(buf); for(i=14,rcon=0x80;--i;) { if((i&1)) { aes_expandDecKey(ctx->key,&rcon); aes_addRoundKey(buf,&ctx->key[16]); } elseaes_addRoundKey(buf,ctx->key); aes_mixColumns_inv(buf); aes_shiftRows_inv(buf); aes_subBytes_inv(buf); } aes_addRoundKey(buf,ctx->key); }
demo.c:
#include #include #include"aes256.h" #defineDUMP(s,i,buf,sz){printf(s);/ for(i=0;i<(sz);i++)/ printf("x",buf[i]);/ printf("/n");} intmain(intargc,char*argv[]) { aes256_contextctx; uint8_tkey[32]; uint8_tbuf[16],i; for(i=0;i<sizeof(buf);i++)buf[i]=i*16+i; for(i=0;i<sizeof(key);i++)key[i]=i; DUMP("txt:",i,buf,sizeof(buf)); DUMP("key:",i,key,sizeof(key)); printf("---/n"); aes256_init(&ctx,key); aes256_encrypt_ecb(&ctx,buf); DUMP("enc:",i,buf,sizeof(buf)); printf("tst:8ea2b7ca516745bfeafc49904b496089/n"); aes256_init(&ctx,key); aes256_decrypt_ecb(&ctx,buf); DUMP("dec:",i,buf,sizeof(buf)); aes256_done(&ctx); return0; }
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希望本文所述对大家C语言程序设计有所帮助。