Hello, I'm using an older version of mbedtls (polarssl-1.3.9).

I have a plain text private key generated from OpenSSL like the following. I'm trying to load this private key into the *rsa_context *using the following code (sorry, for the following code, I just don't know what to copy),

Private key with padding (I have added padding manualy to make it divisible by 16 ) ================================================== // Total private key size is 4013 # define KEY_BUFFER_SIZE 4017 unsigned char private_decrypt[KEY_BUFFER_SIZE]; *printf("private key with padding --> \n %s \n", private_decrypt); --> shows the following*

private key with padding --> RSA Private-Key: (2048 bit, 2 primes) modulus: 00:cc:40:c3:c6:e7:29:ae:f5:94:d8:3b:3f:a4:33: c2:6d:29:86:63:db:b7:8c:d4:07:f7:b3:db:96:83: f7:55:dd:6a:7b:04:49:53:3d:52:30:5f:af:0b:c2: b1:f0:48:a4:66:0a:b7:aa:29:b1:d0:91:4f:9c:1c: cf:df:5c:10:04:85:f9:bd:7b:93:ed:a6:77:80:12: 34:64:19:1a:18:b5:4e:94:7c:39:ce:99:38:50:e9: 82:71:f6:0f:3e:b8:af:11:3c:f4:05:69:72:8e:96: f6:81:ac:46:29:eb:88:88:c5:54:2f:89:1b:b9:32: da:76:23:a2:00:76:a5:8e:50:d3:ba:39:35:f9:4d: 95:63:ff:6a:3c:c8:a8:53:aa:78:d8:81:c8:bd:af: cf:6c:de:33:aa:c9:d4:80:2c:1f:ef:92:90:8a:c4: 88:e6:9a:e5:ad:2d:08:60:89:1a:77:fc:bf:68:64: 6f:c0:a7:fa:33:6d:ff:d2:e6:a4:7f:ad:87:be:0c: cb:9d:18:44:57:fe:db:86:7f:0b:c5:f7:9a:29:4b: 61:62:48:91:01:f7:e7:5e:64:4d:20:ec:ac:3c:07: 59:d6:19:f5:8c:01:9f:d5:6e:16:a8:8e:f9:2d:f6: f8:73:25:0a:b5:d8:62:2a:f8:ba:d5:dc:ff:6e:77: 0d:35 publicExponent: 65537 (0x10001) privateExponent: 4a:17:50:2d:2d:9b:5c:40:ef:3e:44:b7:c0:3b:9a: 52:78:d6:ac:10:7e:93:92:32:55:b3:23:7b:84:e1: 4a:7f:67:e9:b9:d3:53:63:92:15:c4:0f:be:47:60: be:95:cb:34:cc:bc:74:f8:6c:ed:08:59:05:7b:1a: 18:9e:cf:9c:a4:70:c4:40:38:97:e3:63:c3:cc:56: be:dc:b0:2f:b8:4d:09:e5:ca:1e:5c:4c:26:65:9e: 10:f2:bd:f2:f5:91:63:c2:65:8e:35:02:fe:20:5a: c9:0d:11:e2:90:f2:d5:12:27:88:9a:c6:b8:b6:6e: b2:9e:18:5c:ec:ac:ff:63:42:94:b3:b5:ff:69:75: f5:e9:41:77:8b:ee:1d:fa:47:78:9a:9c:1f:84:8b: 85:f9:29:a5:27:e4:1f:04:34:4e:ce:c2:28:18:38: 72:63:5c:44:88:4f:e2:ec:bc:c4:3e:af:d8:bb:a9: 0f:c9:30:0f:bf:bc:1d:8a:fc:d9:cf:27:f5:16:38: 34:07:3d:bf:a5:45:70:df:c5:8f:ee:79:3e:69:6e: e4:0c:74:76:f7:8a:2c:11:34:53:60:27:c3:73:55: 62:d5:06:cb:35:a4:3d:d6:79:3f:50:d4:81:7c:0f: 03:c5:15:b2:4a:eb:84:f1:16:07:ec:16:02:e4:5c: 1d prime1: 00:e5:40:6a:4c:8d:d3:8d:8d:e6:df:e7:1d:c4:8f: 4d:b4:b7:71:51:b7:c4:8a:19:fe:fd:3e:4b:a9:0b: d0:22:64:e0:76:f4:8b:88:d6:30:4b:f6:41:ae:20: c5:cc:79:ec:05:d0:6b:0e:64:16:c5:b5:e3:74:b6: a8:ac:39:74:1d:8a:09:b8:68:64:a4:c1:74:fa:f6: cd:1b:24:d6:86:1e:40:51:dc:09:78:76:8b:16:3e: f1:ea:a9:9b:25:69:4a:c4:3e:ba:63:62:6c:06:40: 83:8d:af:69:89:bd:ad:07:f4:97:39:7c:25:59:80: 07:59:4e:74:a0:4b:2a:05:67 prime2: 00:e4:15:a8:6a:e6:30:95:d6:36:44:a7:57:ac:99: d5:4d:d9:58:59:05:49:89:b8:42:cb:0e:e8:9d:12: fc:a4:76:e7:07:11:08:97:05:7d:0a:34:21:23:03: c9:4b:97:5c:6f:fc:7e:28:8a:c5:b1:44:12:61:03: 60:5e:f9:d2:51:cf:53:0f:7a:2f:a5:96:5a:f5:33: f7:6f:6e:92:14:cc:54:b1:48:ad:da:f7:37:c7:ca: 6f:a2:6a:00:de:73:6c:67:59:78:af:e9:ce:fb:02: 95:f8:0d:82:38:02:79:e5:a4:3b:61:16:b7:70:b1: 70:c8:9a:e8:81:c7:cb:fb:03 exponent1: 57:04:78:54:ce:90:ba:6e:5e:70:26:9d:d9:fa:3b: 18:99:78:dd:f7:cf:16:4c:7f:c9:48:58:17:b6:70: 2e:5d:f4:05:b3:15:33:bf:79:5d:9b:ff:9a:44:be: 4f:bb:07:a7:bd:50:a5:89:c0:4b:13:9b:5e:b5:e6: 98:58:c6:86:5f:db:08:b0:37:63:82:3b:10:f7:95: 2a:f4:74:a9:3b:da:56:38:1b:30:2a:6e:e8:e6:c3: 94:bb:04:34:d3:1e:9a:16:e5:50:cc:0f:0c:e0:78: 0e:d3:c2:4f:92:3b:97:85:73:d1:52:1a:2b:3a:b9: 8f:60:84:4c:43:bb:93:89 exponent2: 00:d7:ea:08:bc:e9:9c:24:bb:dc:33:b1:96:b5:b6: 0a:ce:df:69:5b:1c:3e:39:39:4d:41:9c:a3:67:ce: 89:8b:c7:63:7c:b5:0b:44:ab:d5:6a:cb:5e:73:1f: 2a:77:7c:99:ed:09:41:04:70:1a:25:6d:23:58:e3: 31:5f:b7:6e:fa:33:21:96:0d:3c:fd:ac:0f:fe:ff: 6a:c4:fa:0f:1f:d1:2e:7b:85:29:cf:97:28:1e:e1: ec:3b:fb:cd:46:c8:4d:5e:a8:bc:2f:0b:4e:fd:1f: bd:88:4c:81:71:34:26:e0:d5:4f:c0:e1:18:56:7e: 23:1e:44:46:c6:54:b5:2c:b1 coefficient: 2e:45:e5:0a:bc:66:bc:6e:9d:0d:ce:02:d6:30:62: 44:f6:38:d0:a7:2a:25:c4:42:76:cc:59:38:af:35: cb:6e:a7:5e:3c:71:97:6a:7b:c4:69:25:2e:c4:07: 20:2c:86:5c:a1:e8:6e:d8:e6:b7:9a:21:28:1e:8a: b1:4b:c5:ab:4e:35:e0:83:b5:30:56:53:d7:50:2f: 69:a2:6c:7b:00:d8:15:17:bb:79:72:33:30:11:47: 06:c5:58:16:63:e3:f5:ac:71:3d:ce:64:67:0e:6a: e0:cd:c2:e6:ad:30:f9:3e:7e:52:01:cf:fc:fc:66: 10:44:1a:4b:1b:08:7a:8d 000 <----- padding

============================================

Remove padding and get the actual private key using the the following code, ============================================================================= size_t lenght=strlen(private_decrypt); // length =4016 int N= lenght-4013; // 4013 is the original length of the private key, N is the length of padding private_decrypt[lenght-N]='\0'; // So, now *private_decrypt *contains the actual key =============================================================================

Then I use the following code to split each key and load into rsa_context, ===================================================================== char *strings[]={ "modulus:", "publicExponent:", "privateExponent:", "prime1:", "prime2:", "exponent1:", "exponent2:", "coefficient:"}; char* in = &private_decrypt; char *token; const char s[2] = " "; char *token_2; int k=0, size; do { if(k<8){ token = strstr(in,strings[k]); size= strlen(token); if (token){ *token = '\0'; } switch (k) { case 1: strcat(in,"\0"); printf("k=%d:\n %s\n",k,in); mpi_read_string(&rsaContext->N, 16, in); break; case 2: token_2 = strtok_r(in, s, &in); strcat(token_2,"\0"); printf("k=%d:\n %s\n",k,token_2); mpi_read_string(&rsaContext->E, 16, token_2); break; case 3: break; case 4: break; case 5: break; case 6: break; case 7: break; } //printf("k=%d \n%s\n",k,in); in = token+strlen(strings[k]); k=k+1; } else{ token= "NULL"; break; } }while(token!=NULL);

// Check Public key if(rsa_check_pubkey(rsaContext)!=0){ printf("Reading public key error\n"); exit(0); } =====================================================================

Upon doing all this, when check the if the public key is load correctly or not, I'm getting *"Reading public key error". *Any help, what I'm doing wrong?

Regards, Shariful Alam